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Structural Behaviors of Steel Tube-encased Concrete Columns Confined by Bolted Circular Thin Steel Tube J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-03-12 Chi Zhang, Koki Yamaoka, Takashi Fujinaga, Yuping Sun
Six square steel tube-encased concrete (SC) columns confined by bolted circular thin steel tube were fabricated and tested under cyclical reversed lateral load to investigate their structural behavior. The primary experimental variables included the axial load ratio, the grade of the encased square steel tubes (FB rank and FC rank), the infilling of concrete into the encased steel tube, and the thickness
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Estimation of the Protected Paste Volume by Spatial Tessellation Associated with the Point Pattern of Air Voids J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-03-09 Kazuya Ohyama, Soshi Yamashita, Shin-ichi Igarashi
Paste volumes protected by air voids against frost attacks were estimated using Dirichlet tessellation tiles. Each tile was regarded as an area protected by air voids. The characteristic distance was defined by the largest tile size to reach a cumulative area fraction of 0.95. The significance of this distance was verified by a Monte Carlo test for the simulation of random point patterns. Comparing
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Effect of Fly Ash Content on Rheological Properties of Self-compacting Geopolymer Mortar J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-03-09 Muhammad Talha Ghafoor, Chikako Fujiyama
This study is a continuation of the published research studies relevant to self-compacting geopolymer mortar (SCGM) prototype using fly ash. The aim of this study was to investigate the effect of fly ash quantity on the rheological properties of SCGM. The flow properties include relative flow area (Gm) and relative funnel speed (Rm) is determined with the variation of fly ash to sand ratio (FA/S),
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Shear Behaviour of Full-Scale Squat Shear Walls with and without Precast Pre-walls J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-02-28 Eissa Fathalla, Bertrand Ringeisen, Marc Lenges, Boyan Mihaylov
Reinforced concrete shear walls are commonly used in buildings to resist lateral loads due to wind and seismic action. They are typically either cast-in-place or precast, with the latter solution used to achieve high construction speed and quality control. At the same time, the main challenge with precast solutions is to ensure appropriate connections between the adjacent walls, as well as the anchorage
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Investigation on Preparation and Application in Concrete of Physically Modified Fly Ash J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-02-17 Sun Zhisheng, Zhu Wenshang, Ma Zhaomo, Wang Xingqin, Yang Zhongmao, Zou Chunye, Huang Qin, Feng Xianxu, Rao Zhengtang
Raw fly ash (RFA) was modified by a self-developed new dry energy-saving vertical grinding mill. This was beneficial to improve the particle morphology and distribution of RFA and enhanced its practical applicability in cement and concrete. The physical modification mechanism of RFA was elucidated by simulating the grinding process, and the physical properties and the application performance of modified
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Experimental Study of Bonding Performance of Post-installed Rebar Anchors under Unilateral Pressure J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-01-23 Ning-yu Zhao, Ailin Yang, Hao Liu, Yi Song, Haifei Jiang
Post-installed rebar (PIR) is extensively utilized for rehabilitating, strengthening, and retrofitting existing concrete structures, and its anchorage design greatly concerns the failure mode and tensile behavior. PIR anchored in joints or columns generally suffers pressures normal to its anchorage section in one direction, and PIR's failure mode and tensile behavior can be greatly affected. However
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Development of Post-installed Headed Bars Embedded into Grouted Holes with Enlarged Ends J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-01-24 Hassane Ousalem, Gin Horiuchi, Akitoshi Hamada, Hiroto Takatsu, Yuki Idosako, Hiroyuki Masuda, Yuki Hiroshima
To secure good quality post-installed anchors with a relatively short anchorage length and sufficient pull-out/shear resistance, an anchoring method with enlarged diameter at the end of drilled holes has been developed. Anchors were provided with head plates and fixed into the enlarged holes using non-shrinkage high-strength cementitious grout. Pull-out and shear preliminary tests were conducted to
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Multi-exponential Inversion of the Relaxometry Data of Low-field Nuclear Magnetic Resonance for Cement-based Materials J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-01-20 Xiaoyu Zhang, Chunsheng Zhou, Jing Qiao, Le Li, Lizhi Xiao
Low-field Nuclear Magnetic Resonance (LF-NMR) technique has been attracting increasing concern in nondestructively characterising cement-based materials (CBMs), whose nanoscale pore structure are sensitive to water removal. In order to achieve the multi-exponential inversion of relaxometry data preferred by the interpretation on local pore structure of CBMs, an algorithm incorporating L1 regularisation
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Effect of Temperature on the Early-age Hydration and Setting Behaviour of Mixes Containing GGBS J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-01-12 Fragkoulis Kanavaris, Marios Soutsos, Jian-Fei Chen
Over the past years there has been an increasing trend to use supplementary cementitious materials in concrete to improve its sustainability credentials and durability properties. Perhaps amongst the most popular supplementary cementitious materials is ground granulated blast-furnace slag (GGBS). While the hydration and setting characteristics of mixes with GGBS cured under standard conditions (20°C)
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Shear Behaviour of RC Beams Strengthened using CFRP Grid-ECC/PMM Matrix Composites: An Experimental and Numerical Investigation J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2024-01-07 Xu Yang, Jun-Qi Huang
In recent advancements, a novel strengthening approach employing engineered cementitious composites (ECC) and fibre-reinforced polymer (FRP) materials has emerged. This method integrates ECC as the matrix, carbon fibre-reinforced polymer (CFRP) grid as the internal strengthening component, and epoxy resin for bonding the overlay to the concrete substrate. This study conducted tests on four reinforced
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Probabilistic Service Life Prediction of Alkali Activated Concretes Exposed to Chloride Induced Corrosion J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-12-26 Tamara Janey Chidiac, Neven Ukrainczyk, Dale P. Prentice, John L. Provis
In this study, the well-established service life design code defined in fib Bulletin 34 is adapted to predict the time to initiation of reinforcement corrosion in alkali-activated concretes submerged in marine conditions. The model approach is based on the probabilistic calculation of the time needed for a critical concentration of chloride ions, migrating from the external environment towards the
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Effects of Lime-Based Expansion Material and Freeze-Thaw Cycles on Air-Void Blockage in Concrete J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-12-19 Hidehiko Ogata, Momona Otsuka, Masahiro Hyodo, Haruka Ikadatsu
Air voids in concrete are sometimes observed to be blocked by white precipitates. In this study, the authors conducted freeze-thaw tests on concrete mixed with lime-based expansion material and then performed microscopic observations using scanning electron microscopy, elemental analysis using energy-dispersive X-ray spectroscopy. The size distributions of air voids in the concrete during the curing
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The Influences and Effect Mechanism of Low Temperature Curing on the Performances of Basic Magnesium Sulfate Cement J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-12-13 Keyue Fang, Chengyou Wu, Hongdu Chen
Due to lightweight, high-strength, and high toughness properties, Basic magnesium sulfate cement (BMSC) can be widely used in producing various structural and decorative products. Most current research only focuses on the performance of BMSC under room temperature. However, low temperature environments may have a serious impact on the performance of BMSC, such as during cold seasons or in salt lake
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Hydration Mechanism of Portland and Calcium Sulphoaluminate Cementitious Material J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-12-13 Jiahe Wang, Yanbin Tan, Huajian Li, Yongjiang Xie, Zhongwei Feng
This paper discusses the hydration process of Portland cement (PC) and Calcium Sulphoaluminate cement (CSA) composite material at the early age. The setting time and mortar strength were tested, the hydration process was analyzed by isothermal calorimetry tests, and the hydration products were characterized by XRD, SEM analysis. The results show that: CSA can significantly improve the hydration rate
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Influence of Frost Damage on Performance of Engineered Cementitious Composites J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-12-05 Lanqin Wang, Xiaofeng Han, Li Tian, Penggang Wang, Xiaoguang Sun
Although engineered cementitious composites (ECC) exhibit tensile strain hardening and multiple microcracking characteristics, whether the performance of ECC changes obviously under freezing-thawing conditions is important for the design and maintenance of buildings in the areas with freeze-thaw exposure. Results indicates that, as the number of freeze-thawing cycles increase, the PVA fiber/matrix
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Influence of Corrosion Conditions on Prestressing Force and Residual Tensile Capacity of Corroded Prestressed Concrete Steel Strands J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-23 Jingyuan Li, Tomohiro Miki, Qiuning Yang, Mingjie Mao
This paper investigates the mechanism of the corrosion pattern of wires on the prestressing forces of prestressed concrete (PC) strands. A rigid frame testing machine combined with an electrically accelerated corrosion device was used to test 16 steel strands. Specimens subjected to the tensile load of 50% of the tensile strength were divided into three groups according to the target corrosion level
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Discrete Element Modelling of Powder-compacted C-S-H Matrix J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-21 Zhe Zhang, Guoqing Geng
The usage of supplementary cementitious materials often alters the chemical composition of the main binding phase in modern concrete, i.e., C-S-H. The consequent influence on the mechanical properties is not completely clear, due to the lack of study on the inter-particle interaction of C-S-H. Recent papers published by the authors have provided experimental evidence, and in this work, a subsequent
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Study of Mechanical Properties of Silicate Minerals by Molecular Dynamics Simulation J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-22 Takayoshi Fujimura, Yuji Hakozaki, Shunsuke Sakuragi, Yuu Nakajima, Kenta Murakami, Kiyoteru Suzuki, Ippei Maruyama, Takahiro Ohkubo
The aging and damage of concrete buildings and structures is a problem in modern society. This is especially true for nuclear power plant buildings, which are required to have high safety standards. In this study, molecular dynamics simulations were performed to obtain mechanical properties for silicate minerals, including quartz, which is used as an aggregate in concrete. We also attempted to clarify
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Verification Method of Direct Air Capture by Cementitious Material Using Carbon Isotopes J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-22 Zhenzhen Wang, Abudushalamu Aili, Masayo Minami, Ippei Maruyama
Capturing atmospheric CO2 into cement-based materials is a way to set off the CO2 emissions of concrete production. This study proposes an experimental method to track the origin of cement paste that fixes CO2 directly from the air under natural conditions. By exposing powders of well-hydrated cement paste to air, carbonated cement paste powders are obtained with different carbonation degrees. The
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Effects of Calcination on the Cementitious Activity and Pozzolanic Reactivity of Bayer Red Mud from Different Sources J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-23 Shaoliang Chen, Abdul Ghani Razaqpur, Tuanjie Wang
Red mud (RM) is a hazardous waste generated by aluminum production. It is difficult to utilize due to its high aluminum and iron oxide contents, high alkalinity, and large specific surface. Still, extensive research is underway to explore its potential as partial replacement for cement in concrete. Due to the differences in the physical, chemical, and mineralogical characteristics of bauxites from
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Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part II: Bond Performance of Reinforced Concrete Affected by DEF Expansion J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-18 Taito Miura, Misato Fujishima, Yuichiro Kawabata, Stéphane Multon, Renaud-Pierre Martin, Naoshi Ueda, Yuya Takahashi, Shingo Asamoto, Jean-Francois Seignol
The purpose of this study is to clarify the bond behavior between rebar and concrete during DEF expansion and pullout testing. The details of the expansion test and the influence of reinforcing bar on DEF expansion have been precisely described in Part I. In Part II, the data related to the bond test is described. The change in bond behavior due to DEF expansion is investigated via the one-end pullout
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Experimental and Analytical Performance of Recycled Aggregates Produced by Customized Chemical-Mechanical Treatment J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-15 Babu Lal Chauhan, Gyani Jail Singh
The purpose of this study is to evaluate the experimental and analytical performance of untreated recycled aggregates (URA), chemically treated recycled aggregates (ARA), and customized chemical-mechanically processed recycled aggregates (AmRA). The compressive strength, split tensile strength, flexural strength, fracture energy, and modulus of elasticity of concrete consisting of AmRA (AmRC) are greater
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Influence of Reinforcing Rebar on Expansion due to Delayed Ettringite Formation along the Bonding Length – Part I: The Role of Bond on Expansive Behavior of Concrete J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-09 Yuichiro Kawabata, Taito Miura, Misato Fujishima, Naoshi Ueda, Yuya Takahashi, Shingo Asamoto, Stéphane Multon, Renaud-Pierre Martin, Jean-Francois Seignol
This paper explores the effects of rebar as an internal restraint on the expansion of delayed ettringite formation (DEF) in concrete. Concrete specimens embedded with steel bars without end plates are subjected to heat treatment followed by immersion in water. The effect of stirrups on expansion is also investigated. The results show that the longitudinal expansion of specimens without stirrups differs
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Incineration Bottom Ash as Aggregate for Controlled Low Strength Materials: Implications and Coping Strategies J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-11-07 Wei-Chien Wang, Jia-Chen Xue, Chia-Yun Huang, Hsiao-Chuan Chang
Most waste disposal methods in Taiwan involve incineration, the incineration bottom ash (IBA) which is accumulated over the years and needs urgent treatment. Hence, using IBA to create renewable materials is essential for the sustainable development. In this study, natural aggregates in the controlled low strength material (CLSM) were replaced with IBA. Its workability, setting time, unit weight, mechanical
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Numerical Analysis of Impact Compression Failure and Dynamic Mechanical Behavior of Lightweight Aggregate Concrete at Low Temperatures J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-10-27 Zhengyu Duan, Zhiwu Zhu, Hongming Su, Fulai Zhang, Zhijian Mao
Lightweight aggregate concrete (LWAC) is often used in building structures in these cold regions, which may also bear impact loads. To investigate the dynamic mechanical behavior of LWAC at low temperatures, this study conducted numerical simulations of the split Hopkinson pressure bar impact experiment on LWAC at room and low temperatures. The numerical simulation results showed good agreement with
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Influence of Temperature in the Early-age Elastic Modulus Evolution of Cement Pastes and Concrete J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-10-26 José Granja, Renan Rocha Ribeiro, Thomas Russo, Rodrigo Lameiras, Miguel Azenha
The influence of temperature on the hydration of cementitious materials has been traditionally modelled using the maturity concept and Arrhenius law. This approach yields a single material property, called apparent activation energy (Ea), that describes the whole temperature dependence. Determining Ea experimentally has sparked controversy, such as whether the different properties (e.g., compressive
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Error Factors in Quantifying Inorganic Carbonate CO2 in Concrete Materials J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-10-21 Haruka Takahashi, Ippei Maruyama, Takahiro Ohkubo, Ryoma Kitagaki, Yuya Suda, Atsushi Teramoto, Kazuko Haga, Takahiro Nagase
In this study, CO2 quantification was performed on various concrete binder and aggregates by back titration, ther-mogravimetric method, and combustion-infrared absorption method, and their mutual consistency and error factors due to material characteristics were investigated. The back titration measures CO2 directly and is considered the suitable method for both materials, although the effect of sulfide
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Steel Fiber to Improve Thermal Resistance of High Strength PVA-ECC after Exposure to Elevated Temperature J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-20 Yuxuan Zhou, Qing Wang, Mianheng Lai, Johnny Ching Ming Ho
The use of engineered cementitious composite with polyvinyl alcohol fiber has shown excellent potential in building facilities due to its strain-hardening and multiple-cracking features. However, when polyvinyl alcohol fiber melts at around 230°C, spalling behavior of engineered cementitious composite may occur, weakening the mechanical properties and reducing ductility of high strength engineered
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An Adaptive Homogenization Scheme for Modeling the Effective Elastic Properties of Early Age Concrete J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-20 Tuan Nguyen-Sy, Minh-Quan Thai, Ngoc-Minh Vu
This study aims to develop a simple yet accurate adaptive homogenization approach for modeling the effective elastic properties of concrete for the whole hydration range from early age to hardened state. Considering available data from a similar microstructure, the method accurately accounts for the impact of cement hydration degree on the effective elastic properties of the heterogeneous concrete
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Stress Self-sensitivity of Carbon Black-filled Mortar under Nondestructive Compression and the Effects of Electric Circuit and Specimen Dimensions J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-15 Vo Minh Chi, Nguyen Min Hai, Nguyen Lan, Nguyen Van Huong
Cement-based materials with self-sensing capabilities have the potential to be used as compression load cells in various applications. This study aims (i) to clarify the change in resistivity in self-sensing mortar (SSM) under nondestructive compressive stress and the underlying mechanism of this change, (ii) to examine the effects of different conditions such as electric circuit and specimen dimension
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Effect of Sodium Paraben-based Anti-fungal Agents in Controlling the Aspergillus Niger Growth in Cement Mortars J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-09 Syed Badar Farooq, Muhammad Ali Sikandar, Muhammad Hanif Khan, Zhao Qiuhong, Han Zhu, Nabi Ullah, Muhammad Noman, Inam Ul Haq Khan
This study deals with application of sodium-paraben based anti-fungal agents in cement mortars and their effect on the physical, mechanical, and anti-fungal activity. The fungus Aspergillus Niger, typically found in damp buildings, grew on cement composites. Sodium propyl parahydroxybenzoate (SPP) and sodium methyl parahydroxybenzoate (SMP), two sodium paraben anti-fungal agents, were used in pastes
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The Efficiency of the Ordinary Polypropylene Fiber in Producing One-part Alkali-Activated Slag Composites with Strain-Hardening Behavior J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-08 Allahverdi Bahrami, Kiachehr Behfarnia, Reza Soltanabadi
This paper evaluates the efficiency of polypropylene fibers in improving the tensile and flexural characteristics of fiber-reinforced alkali-activated slag composites with strain-hardening behavior. Several different composites were produced and the mechanical properties of the composites were investigated during compressive and flexural tests. Furthermore, the mid-span curvature of the beams was measured
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Predicting the Ultimate Properties of Engineered Cementitious Composites by Maturity Method J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-08 Özlem Kasap Keskin, Süleyman B Keskin, Kamil Tekin
This study examines the application of the maturity method to obtain the ultimate properties of ECC. Within the scope of the study, the maturity method according to the Arrhenius equation was applied to four different ECC mixtures encountered in the literature: the activation energies and the ages at which they achieve ultimate properties were determined. Subsequently, the mixtures were subjected to
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Experimental Study of Graphene Oxide on Hydration Process of Tricalcium Silicate J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-09-07 Zhanguo Li, Huan Du, Zigeng Wang, Yue Li
The effects of graphene oxide (GO) with different contents on hydration process of tricalcium silicate (C3S) were investigated in this article. The scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, nitrogen desorption, nuclear magnetic resonance, Fourier transform infrared spectroscopy and Raman spectroscopy were used to analyze the micro-evolution of the GO/C3S hardened
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A Review of Numerical Models for the Performance Assessment of Concrete Structures Affected by Alkali-Silica Reaction J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-08-25 Yuya Takahashi, Taito Miura, Naoshi Ueda, Yoshihiko Toda, Go Igarashi, Stéphane Multon, Yuichiro Kawabata
This paper reviews numerical studies on the effect of expansion and damage due to alkali-silica reaction (ASR) on the mechanical performance of concrete and reinforced concrete at the structural scale level. Previous research on model development that has focused on the performance of RC members or structures is collected and summarized based on how they operationalize expansion progress. The models
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Pozzolanic Reaction of Carbonated Wollastonite Clinker J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-08-22 Frank Winnefeld, Florian Läng, Andreas Leemann
Carbonated wollastonite-based clinker is proposed as a potential novel supplementary cementitious material. The clinker can be synthesized from limestone and a silica source, and exhibits a CO2-footprint after carbonation, which is approximately 60-70% less than the one of Portland cement. When carbonated, a silica-rich amorphous phase forms besides various polymorphs of calcium carbonate. When the
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Freezing Characteristics of Deicing Salt Solution and Influence on Concrete Salt Frost Deterioration J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-08-22 Haoxiang Luan, Jin Wu, Fei Geng, Xing Zhao, Zhi Li
Concrete structures would commonly suffer from salt frost deterioration in cold climate areas. The governing mechanism of concrete salt frost deterioration was comprehensively influenced by the freezing characteristics of deicing salt solutions. Characteristics of solution density, freezing point, freezing volume variation, and freezing expansion pressure of deicing salt solutions were experimentally
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A Prediction Method for the Corrosion Rate of Steel Rebar in Carbonated Mortar under Variable Environmental Conditions J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-08-19 Luge Cheng, Ippei Maruyama
This study investigated carbonation-induced corrosion behaviours with different water-to-cement (w/c) ratios and cover thicknesses under different environmental conditions. The relative humidity (RH) and temperature dependence of the corrosion behaviours were determined by considering the water content and electrical resistivity of the mortar and the corrosion rate of the steel reinforcing bar (rebar)
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Experimental Study and Development of Prediction Model of Self-Compacting Concrete Incorporating Fly Ash on Compressive Creep Behaviour J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-08-10 Doan-Binh Nguyen, Cheng-Jun Wu, Wen-Cheng Liao
Creep strain is a significant factor affecting the dimensional stability and durability of the concrete structure. This paper aims to develop the prediction model B4TW-SCC for the creep of self-compacting concrete (SCC), which still lacks accurate prediction models. Besides, the compressive creep of SCC was experimented with by partially replacing up to 40% of the cement weight with fly ash. The tested
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Recent Advances in X-ray Computed Tomography for Alkali-Activated Materials: A Review J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-08-03 Yukun Kong, Masaji Kato, Kiyofumi Kurumisawa
Alkali-activated materials (AAMs) have been extensively studied due to their high performance and low carbon emissions. However, the long-term durability of AAMs remains a major concern, which is closely related to their microstructures and pore networks. X-ray computed tomography (CT) has emerged as a powerful non-destructive technique for threedimensional microstructural analysis in the field of
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Mechanical Properties of Hybrid Fiber Recycled Concrete under Cyclic Compression J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-07-19 Yuliang Chen, Qi Wang, Xin Liang, Peihuan Ye, Hong Li
In this paper, the mechanical properties of 84 different hybrid fiber recycled aggregate concrete under cyclic compression are designed and studied. The modification effect of four kinds of hybrid fiber combinations of steel fiber (SF) and carbon fiber (CF), glass fiber (GF), polyvinyl alcohol fiber (PVA) and polypropylene fiber (PF) on recycled aggregate concrete (RAC) is analyzed from macro and micro
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Performance of Polypropylene Fiber Reinforced GGBFS-based Alkali Activated Composite under Elevated Temperatures J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-07-07 Khatib Zada Farhan, Megat Azmi Megat Johari, Ramazan Demirboğa, Ayman Sabry Shihata
This study evaluates the impact of incorporating polypropylene fibers on the endurance of 100% ground granulated blast furnace slag (GGBFS) based alkali-activated composite (AAC) exposed to elevated temperatures. In addition, the impact of critical variants, like polypropylene fiber volume fractions, fiber length, alkaline solution monomer ratio, and curing regime, on the overall performance of the
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Impact of Radiation-induced Expansion of Aggregate on Structural Performance of Hollow Cylindrical RC Member J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-07-07 Daisuke Kambayashi, Ippei Maruyama, Osamu Kontani, Shohei Sawada, Takahiro Ohkubo, Kenta Murakami, Kiyoteru Suzuki
Reinforced concrete (RC) hollow cylindrical members were numerically investigated to understand the impact of the radiation-induced volume expansion of aggregates on the seismic performance of the member. The rigid body spring network model was used in this analysis, and the proposed constitutive laws and used parameters were validated by comparing two horizontal loading experiments for two RC members:
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Development of Mesoscale Simulation Approach of Concrete Material and Structural Behavior with Physical Damages with RBSM J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-06-27 Tamon UEDA, Zhao WANG
This paper introduces the development of mesoscale modeling approach with Rigid Body Spring Model (RBSM) for concrete with damages for the multi-scale modeling of concrete and concrete structures with damages. The development works have been conducted by the team, including the authors, at Hokkaido University. The mesoscale modeling is with the generic model applicable for various damage/deterioration
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Effect of Water Reducing Agent and Retarder on Properties of Ternesite-Calcium Sulfoaluminate Cement Synthesized at Low Temperatures J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-06-22 Wei Guo, Baorui Hu, Jialin Qiu, Juan Fu, Yueyang Hu, Binbin Qian
The setting time of ternesite-calcium sulfoaluminate (TCSA) is shorter while the fluidity and mechanical strength are lower. Herein, the method of synergistic regulation of polycarboxylate superplasticizer and β-cyclodextrin was adopted to solve this. The results showed that, compared to the reference sample, when 0.25% polycarboxylate superplasticizer compounded with 0.05% β-cyclodextrin, the setting
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Effect of Original Mix Proportion on Rapid Removing of Attached Mortar for Recycled Concrete Aggregate Through a Freeze-thaw Approach J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-06-23 Fuyuan Gong, Zhao Wang, Liu Yang, Qingpei Wu, Yingjie Ning, Qiang Zeng
The fundamental reason to the unsatisfied performance of recycled aggregate concrete (RCA) is the existence of attached mortar in recycled concrete aggregate. A new physical method to remove the attached mortar is proposed in this study, which is a multiple process based on freeze-thaw cycles (FTCs). This study adopts the freeze-thaw modification technology and explores its efficiency in treating RCA
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Nanoparticle-based Magnetic Induced Heating for Oil Well Cement Slurries: Experimental Study and Modelling Development J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-06-13 Ana Beatriz de Carvalho Gonzaga e Silva, Mariane Rodrigues Rita, Fabiola da Silveira Maranhão, Thiago Monteiro Mello e Alvim, João Humberto Guandalini Batista, Oscar Aurelio Mendoza Reales, Fernando Gomes de Souza Junior, Romildo Dias Toledo Filho, Eduardo de Moraes Rego Fairbairn
This paper presents an experimental campaign and a numerical model that describe a potential application of magnetic nanoparticles (MNP) in oil well cementing pastes. MNP, when subjected to an oscillating magnetic field, can generate a heating effect, which accelerates the cement hydration reaction through thermal activation. This, in turn, reduces the downtime during expensive oil well cementing operations
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Flexural Behavior of Precast Concrete Slab Connections using Loop Steel Bars and Mortar J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-06-07 Quang-Thinh Nguyen, Takeshi Maki, Hiroshi Mutsuyoshi, Yosuke Ishihara
Loop reinforcements are commonly used to connect precast concrete elements. However, the strength of the connection in the case of short overlapping lengths and mortar joints has not been discussed extensively in previous studies. Moreover, proposed equations tend to overestimate the flexural capacity of the connection. In this study, six specimens with vertical loop steel bars and mortar joints were
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Pullout Tests on Concrete Breakout Strength of Headed Reinforcement Bars Embedded in Roof Exterior Beam-Column Joints J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-25 Hadia Mohsuni, Tomoya Matsui, Yasushi Sanada, Joji Sakuta, Toshihiko Kiyohara, Yooheui Kim, Tomohiro Adachi
Recently, the use of headed bars as mechanical anchorage in reinforced concrete beam-column joints has increased rapidly. This type of anchorage is used for T-shaped beam and exterior column joints at middle floors and for L- and T-shaped beam-column joints at the rooftops of buildings. However, few experimental data are available regarding the anchorage capacity of headed bars embedded in L-shaped
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Applicability of Deformation Indices Reasonably Evaluating Load Carrying Capacity and Failure Mode of Full-Scale RC Members Subjected to Bilateral Loads J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-25 Satoshi Komatsu, Yoshinori Miyagawa, Toyofumi Matsuo, Akihito Hata, Tsuguhiro Shimabata, Hikaru Nakamura
In this paper, the applicability of two deformation indices related to displacement of concrete members proposed by the authors has been verified for full-scale RC members with shear or bending failure under bilateral loads. These two indices, namely "thickness increment of RC member" assuming out-of-plane shear failure, and a newly proposed index, "relative displacement on compressive edge in RC member"
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Effect of Bond Property Between CFRP Bar and Concrete on Nonlinear Behavior of Circular CFRP Reinforced Concrete Beams J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-20 Mamy A. Rabotovao, Tomohiro Miki
Carbon fiber reinforced polymer (CFRP) bars present advantages over conventional steel rebars such as non-corrosiveness and relatively high tensile strength. CFRP bars cannot directly substitute steel rebars as the main reinforcement for concrete structures due to a lack of understanding of the behavior of CFRP-reinforced concrete (RC) members. This research investigates the effect of surface characteristics
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Quasi-static and Dynamic Mechanical Properties of Engineered Geopolymer Composites with Hybrid PVA and Recycled Steel Fibres J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-16 Hui Zhong, Yi Wang, Mingzhong Zhang
Recycled tyre steel (RTS) fibre is favoured as a replacement for industrial steel fibre to reduce the environmental impact and material cost of fibre reinforced cementitious composites as well as a potential substitute for the commonly used polyvinyl alcohol (PVA) fibre to develop sustainable engineered geopolymer composites (EGC). This paper systematically examines the effect of hybrid PVA and RTS
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Fire Spalling Behavior of Various Polymer Modified Mortars under Ring Restraint J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-12 Yusuke Sugino, Mitsuo Ozawa, Makiho Sukekawa
Polymer modified mortar (PMM) is indispensable for repairing and reinforcing concrete structures owing to its excellent adhesion to concrete, compactness, and workability. However, PMM tends to spall when exposed to high temperatures because it contains organic polymers. In this study, a ring-restrained heating test was performed on normal cement mortar and PMM mixed with three types of polymers to
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Tension Stiffening Affected by Radiation-induced Volume Expansion of Aggregate J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-11 Daisuke Kambayashi, Ippei Maruyama, Osamu Kontani, Shohei Sawada, Takahiro Ohkubo, Kenta Murakami, Kiyoteru Suzuki
The tension stiffening behavior of reinforced concrete (RC) prisms, affected by the aggregate volume expansion induced by neutron irradiation, were numerically investigated using a rigid body spring network model. First, the model was validated by comparison with the uniaxial tension test results of wet- and dry-cured (with volume contraction of concrete) RC prisms. Subsequently, different degrees
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Evaluation of Bond Repair Effect for Ultra-high-strength Concrete Specimens by Neutron Diffraction Method J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-05-03 Ayumu Yasue, Kensuke Kobayashi, Masahiro Yoshioka, Takashi Noma, Koichi Okuno, Seiichiro Tanaka, Yoshikazu Hirata, Tokunao Oh-oka, Yoshiharu Kimura, Tomoya Nagai, Takahisa Shobu, Yuhei Nishio, Manabu Kanematsu
The purpose of this study was to evaluate the use of resin injection to repair cracks in ultra-high-strength concrete (UHSC) members. As a preliminary step, the applicability of the neutron diffraction method (NDM) to investigate the effect of repairs in UHSC specimens was examined. The experimental results showed that the NDM can measure stresses in rebars in UHSC and normal concrete specimens. Therefore
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The Impact of Carbonation Curing on the Fatigue Behavior of Polyvinyl Alcohol Engineered Cementitious Composites (PVA-ECC) J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-04-29 Wei-Hsiu Hu, Duo Zhang, Brian R. Ellis, Victor C. Li
Use of Engineered Cementitious Composites (ECC) has been proven to enhance structural fatigue resistance and reduce the use-phase emissions for transportation infrastructure. Carbonation curing offers an opportunity to reduce the embodied carbon of ECC via direct CO2 sequestration. In this study, the impact of carbonation curing on ECC’s fatigue resistance was examined. ECC’s CO2 uptake, static flexural
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Exploration of Advanced Fabrication Techniques for Organic Shaped Energy Dissipators in Spillways J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-04-25 Martin Petřík, Petr Štemberk, Milan Zukal
This paper focuses on the advanced design and production of concrete energy dissipators which are used for aeration of water on spillways. Traditionally, the concrete energy dissipators assumed simple block shapes which were dictated by limited production capabilities, mainly by the planar formwork and issues related to demolding. The advent of new concrete mix design and flexible construction technologies
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Physicochemical Analysis of Chloride Diffusion and Adsorption in Water-saturated Concrete: Theory and Measurement J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-04-21 Tsuneki Ichikawa, Kazuko Haga, Kazuo Yamada
The theory of ionic diffusion in water-saturated concrete accompanying ion exchange with mobile or immobile adsorbed ions was constructed by using the general theory of diffusion and the condition of electrical neutrality. Analysis of the diffusion profile of chloride (Cl−) ions in concrete with the theory revealed that adsorbed Cl− ions in AFm and C-S-H are as mobile as free Cl− ions in the pore solution
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Experimental Studies to Investigate Efficacies of Granite Porphyry Powder as Homologous Manufactured Sand Substitute J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-04-21 Liu Tong, Zhu Lihua, Yu Bentian, Li Tong
Stone powder and others waste powder causes serious harm to the environment, society, ecosystem and human well-being, applying it to concrete is a path of green and effective. In this study, a series of tests was carried out on manufactured sand concrete with different granite porphyry powder contents. The results showed that when the stone powder content was lower than 8%, the cracking resistance
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A Micromechanics-based Study on Cracking Characteristics of Engineered Geopolymer Composite J. Adv. Concr. Technol. (IF 2.0) Pub Date : 2023-04-19 Motohiro Ohno, Victor C. Li
This study aims at experimentally and analytically characterizing cracking characteristics of Engineered Geopolymer Composites (EGCs) and at identifying optimal combinations of micromechanical parameters for enhancing the composite tensile performance. Fly ash-based EGCs with different volume fractions of polyvinyl alcohol fibers are investigated. The number of cracks and residual crack widths are