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Influences of composition and reaction conditions on molecular structure, hygroscopicity, and swelling behavior of alkali-silica reaction gels Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-11 Arkabrata Sinha, Jianqiang Wei
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Understanding the multiple actions of phosphoric acid-modified steel slag powder on early-age hydration of cement Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-10 Zedi Zhang, Zijian Jia, Ruilin Cao, Wei Wang, Chao Liu, Yueyi Gao, Nemkumar Banthia, Yamei Zhang
The retardation of the early-age hydration of cement by steel slag powder severely restricts its use in cementitious materials. This paper reports on the modification of steel slag powder with phosphoric acid, which is found to alleviate its inhibition of cement hydration. Comprehensive investigations of solid phase assemblage and elements dissolving behavior in cement pastes reveal that multiple actions
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The effect of depth-dependent carbonation on the interfacial strength between GFRP reinforcement bar and reactive magnesia cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-10 Bo Wu, Peng Wang, Xianjun Su, Weiwen Li, Christopher K.Y. Leung, Jishen Qiu
Reactive magnesia cement (RMC) is an emerging class of low-alkaline and CO-sequestering binder, which can mitigate the deterioration of GFRP reinforcements induced by a high-alkaline environment, e.g., in Portland cement. This study investigated the slip behavior of GFRP rebar embedded in RMC composite, which varies with carbonation depth significantly. The variation of the interfacial bond was determined
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Evaluation of novel copper-based antimicrobial admixtures for biocorrosion mitigation of cement paste Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-09 Weichao Ying, Hailong Ye
Copper-based antimicrobial admixtures have been favoured for mitigating microbially induced concrete corrosion (MICC) owing to their practical bactericidal abilities. However, concerns regarding the leachability of hazardous components and the long-term efficacy of these admixtures have hindered their industrial application, with limited understanding of their comparative antimicrobial performance
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The industrial SO2-induced corrosion: Investigation of the corrosion onset Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-09 Jie Huang, Ditao Niu, Hongqu Wu, Yao Lv, Qiang Fu
The stability of the passivation film on reinforcing steel is significantly influenced by the internal chemical environment of concrete under industrial sulfur dioxide (SO) corrosion. This study aimed to investigate the electrochemical state of the reinforcing steel and the internal chemical environment (corrosion products, phase composition, and pore structure) of concrete by conducting indoor simulations
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Understanding the rheological behavior of reactive magnesia-metakaolin system in the context of digital construction Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-08 Yiming Peng, Cise Unluer
Application of 3D printing in building projects can enhance construction efficiency and productivity. Rheological properties play a key role in defining the suitability of different cement-based mixes for digital construction. In this study, the rheological behavior of the MgO-SiO system involving metakaolin (MK) as the silica source was thoroughly investigated. Mixes with two different MgO/MK ratios
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Study on the deterioration of concrete performance in saline soil area under the combined effect of high low temperatures, chloride and sulfate salts Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Daming Luo, Fan Li, Ditao Niu
Concrete structures in saline soil regions are prone to degradation due to chloride and sulfate erosion, compounded by the concurrent influences of drying, high and low temperatures, and freeze-thaw cycles. This study establishes a simulation test system for complex saline soil environments, integrating findings from real-world environmental investigations. The investigation focused on the degradation
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Influence of type and particle size of superabsorbent polymer on early water distribution and internal curing zone properties of cement paste Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Fangyu Chen, Shuai Bai, Xinchun Guan, Jing Qiao, Heqing Gou
The types of commercial superabsorbent polymer (SAP) mainly include ionic-SAP acrylic acid (AA) and nonionic-SAP acrylamide-acrylic acid copolymer (AM), which have different particle sizes due to the limited preparation methods. This study used H low-field NMR to clarify the influence of type and particle size of SAP on the water distribution of cement paste. Backscattering electrons and nanoindentation
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Enhancing compressive strength in cementitious composites via plasma-treated PET aggregates: Insights into interface mechanics Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Huali Hao, Shan Li, Cheuk Lun Chow, Denvid Lau
Surface modification stands out as a promising solution for augmenting interface bonding of cement-based materials incorporating recycled plastic waste as a substitution for natural aggregates. In this work, plasma treatment was employed for surface modification, and the compressive strength of fabricated mortar with plasma-treated PET particles was improved by approximately 9% after a 28-day curing
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Enhanced mechanical property of steel slag through glycine-assisted hydration and carbonation curing Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Seohyun Kim, Jaekyun Kim, Dongho Jeon, Jusung Yang, Juhyuk Moon
Steel slag, an industrial by-product from the steelmaking process, has limited utilities primarily due to its low reactivity and grindability. This study proposed a new method to actively utilize steel slag as a cementless binder by adding glycine to enhance the reactivity of steel slag under CO curing condition. Employing glycine as an activator under 1 day of hydration followed by 7 days of carbonation
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Dynamic behaviors of nickel coated carbon nanotubes reinforced ultra-high performance cementitious composites under high strain rate impact loading Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-04 Danna Wang, Xinyue Wang, Hailong Ye, Feng Yu, Baoguo Han
Understanding the dynamic mechanical behaviors of materials is a prerequisite for reliably analyzing and predicting the dynamic response of structures, which is of great significance for transportation infrastructure and military engineering subjected to extreme loads, particularly dynamic loads at high strain rates. Nickel coated multi-walled carbon nanotubes (Ni-MWCNTs) show promise as a reinforcement
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Carbonation curing of belite-rich cement: The role of fly ash and strengthening mechanism Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-03 Qingfeng Guan, Yuefeng Ma, Ming Jin, Haoyu Zeng, Chang Gao, Jinhui Tang, Jianzhong Liu, Fangyu Han, Wenwei Li, Jiaping Liu
Belite-rich cement (BRC) has gained increased attention in recent years due to its low energy consumption and high long-term performance. However, the carbonation behavior of the binder formed by its combination with fly ash (FA) has been scarcely revealed. This study investigated the influence of carbonation curing and FA replacement level on the carbon capture and mechanical properties of BRC. The
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Effect of 2-acrylamide-2-methylpropane sulfonic acid on the early strength enhancement of calcium silicate hydrate seed Cement Concrete Comp. (IF 10.5) Pub Date : 2024-04-02 Fengzhen Lei, Lei Lei, Yangyang Kang, Caijun Shi
Nanomaterials are becoming widely used in cement to enhance the properties of cement-based materials. Artificially synthesized nano-C-S-H serves as a nucleation site for the hydration product C–S–H gel, facilitating its formation. This is deemed as an early strength agent to effectively promote cement hydration. Introducing comb-like polycarboxylate ether (PCE) during the synthesis of C–S–H can effectively
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The hydration and heavy metal immobilization performance of the CO2-active incineration fly ash-calcined clay-cement (CFC3) composite low-carbon cementitious system Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-31 Junjie Hu, Renjie Niu, Junyao Liu, Weizhuo Zhang, Jun Liu, Feng Xing
CO-active enhances the performance of municipal solid waste incineration fly ash as a supplementary cementitious material, increasing its utilization in cementitious systems. CFC, a low-carbon cementitious material, effectively utilizes CO-active incineration fly ash (CIFA). To minimize cement usage, the component effects on hydration need to be studied. In this study, hydration, mechanical and environmental
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Quantitative characterization and control mechanism of pore structure in geopolymer foams with addition of various surfactants Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-30 Ningning Shao, Chunling Dong, Xuankun Wei, Yiping Su, Zhijun Dong, Zuotai Zhang
Pore structure control mechanism in geopolymer foams (GPFs) remains qualitatively understood, posing great challenges for GPF applications. In this study, by modelling of various pore structures with regular geometric patterns, total porosity, open porosity, pore size distribution, and pore deformation were quantitatively characterized. Then, we focused on slurry viscosity and surface tension as the
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Water loss and shrinkage prediction in 3D printed concrete with varying w/c and specimen sizes Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-29 Lei Ma, Zijian Jia, Yuning Chen, Yifan Jiang, Bruno Huet, Arnaud Delaplace, Yamei Zhang, Qing Zhang
In 3D printed concrete (3DPC), the absence of formwork leads to increased shrinkage compared to traditional cast concrete which uses formwork. This increase in shrinkage is primarily due to the rapid evaporation of moisture during the early stages. Therefore, our research focused on how the initial water content and the exposed surface area affect the total shrinkage by varying water-to-cement ratio
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In-situ investigation on the carbonation behaviors of various mineral phases in steel slag: The role of RO phase Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-29 Peng Liu, Liwu Mo, Jingkui Zhong, Mingshu Tang
Exploring the mineral compositions of steel slag and the microstructure evolutions of its carbonation products is very important for deeply understanding the carbonation mechanism of steel slag, which can promote the application of steel slag in carbon capture and storage. In this paper, the carbonation behaviors of various mineral phases in steel slag were investigated by using an ingenious in-situ
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Review on physical and chemical activation strategies for ultra-high performance concrete (UHPC) Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-27 Xin Su, Zhigang Ren, Peipeng Li
This paper aims to investigate the latest advancement in physical and chemical activation strategies for ultra-high performance concrete (UHPC), addressing challenges such as high autogenous shrinkage, insufficient hydration, and inadequate steel fibers utilization, to further enhance its performance and achieve broader application. Firstly, an in-depth discussion is provided on physical activation
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Pretreatment of alkali activation and carbonation of steel slag for using as binding material Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-26 Wenzheng Li, Mingli Cao, Fangyu Liu, Dan Wang, Jun Chang
Steel slag (SS) exhibits low hydration activities and expansive phases, which should be pretreated prior to using as binding materials. Thus, these properties of SS were improved through a combined treatment of alkali and then wet carbonation (A_C) in this study. Effect of sodium silicate modulus (M = 1.0–2.5) and carbonation temperature (50–200 °C) on cementitious property of SS was investigated.
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Strength and stiffness characterization of ultra-high performance concrete (UHPC) cement paste phases through in-situ micro-mechanical testing Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-26 C. Puttbach, G.S. Prinz, C.D. Murray
Compressive strength and stiffness of concrete materials involve the complex interaction of aggregates and hardened cement, which can involve even more complex phases formed through hydration processes. Typically, the strength and stiffness of concrete materials are determined through material-scale testing, focusing on the bulk behavior while ignoring individual constitutive material interactions
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Orientation Dependency of 3D printed SHCC at increasing length scale Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-22 K. Nefs, K.C.J. de Kroon, J. Sloots, F.P. Bos, T.A.M. Salet
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Failure mechanism of steel fiber pullout in UHPC affected by alternating cryogenic and elevated variation Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-21 Bei He, Obinna Onuaguluchi, Nemkumar Banthia, Hongen Zhang, Qiang Ren, Yi Zhang, Zhengwu Jiang
This paper investigates the pullout response of straight and hooked-end steel fiber embedded in Ultra-high Performance Concrete (UHPC) subjected to alternating cryogenic (−170 °C) and elevated (200 °C) temperature variation. The temporal evolution of Acoustic Emission (AE) parameters and failure behavior during the pullout process were monitored in situ using the AE test. Additionally, changes in the
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Cementation of spent radioactive ion-exchange resin ashes using alkali-activated cements: Physicochemical and structural changes Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-20 Pedro Perez-Cortes, Ines Garcia-Lodeiro, María Cruz Alonso, Francisca Puertas
Spent ion-exchange resins (IERs) constitute the major volume of solid radioactive wastes generated by the nuclear industry and Portland cement wasteforms exhibit limitations for their conditioning and storage. In this paper, an alternative approach is conducted involving the solidification of IER ashes (IERAs) through the use of “one-part” alkali-activated cements (AACs). Systems with different chemistry
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Tomographic analysis of segregation behavior of hollow glass microspheres in lightweight cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-19 Jingwei Yang, Hyunuk Kang, Caijun Shi, Xiang Hu, Juhyuk Moon
Lightweight concrete must contain lightweight aggregates that are more susceptible to segregation than traditional concrete. Concrete has increasingly used lightweight fillers but research on segregation analysis is relatively scarce. To systematically investigate the segregation of hollow glass microspheres (HGMs), lightweight cementitious composites (LWCC) with a water-to-cement (w/c) ratio of 0
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Enhancing the mechanical properties and hydration of cement paste by incorporating GO/nano In(OH)3 composite with high specific surface area Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-18 Xingyu Gan, Yali Li, Weichao Li, Laibo Li, Lingchao Lu, Xin Cheng
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Synergy of micron graphite and fly ash for alkali-activated cementitious material: Electromagnetic absorption characteristics and mechanism Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-16 Peiqi Zheng, Kaixuan Zhang, Weize Wang, Jing Wang, Xiuzhi Zhang
To attain a balance between compressive strength and electromagnetic wave absorption performance, this paper combined two electromagnetic wave loss mechanisms (magnetic loss and electrical loss), and prepared an environmentally friendly alkali-activated slag/fly cementitious material (ASFC) using micron graphite (MG) as the absorber and ground granulated blast furnace slag (GGBS) and fly ash (FA) as
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Flexural performance of nature-inspired 3D-printed strain-hardening cementitious composites (3DP-SHCC) with Bouligand structures Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-14 Guoqiang Du, Yan Sun, Ye Qian
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Polymer/cement composite electrolyte with high strength and high ionic conductivity for structural supercapacitors Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-12 Yuanyuan Zhang, Dong Zhang
All-solid-state structural supercapacitors (ASSC) based on polymer/cement electrolytes (PCE) are promising energy storage devices in buildings due to the tremendous demand for zero-energy buildings. However, the challenge of PCE remains in well balancing the mechanical properties and ionic conductivity. Herein, an integrated electro-mechanical PCE introducing PAM (20 wt%, synthesized by in-situ polymerization)
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Preparation and performance analysis of 3D printed lightweight EPS concrete: Insights from the excess paste theory Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-11 Geng Niu, Chao Liu, Lutao Jia, Lei Ma, Yifan Shi, Yifan Jiang, Zijian Jia, Yu Chen, Nemkumar Banthia, Yamei Zhang
3D printed EPS concrete integrates the advantages of 3D printing technology and EPS lightweight concrete, offering the potential to reduce carbon emissions and enhance the environmental sustainability of construction. In this study, we successfully printed EPS concrete with densities ranging from 500 to 1900 kg/m, using EPS particles to substitute for sand up to 100% volume ratio. The rheology of the
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Insight into ettringite induced concrete crack healing by electrodeposition: Effects of electrochemical parameters and numerical simulations Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-11 Qing Chen, Linjun Xie, Hehua Zhu, Wei Liu, Zhengwu Jiang, Zuhua Zhang, Dong Zhang, Bin Li, Jiann-Wen Woody Ju
The rapid healing of concrete through electrochemical deposition induced by ettringite has been recently proposed. In this paper, the rapid healing mechanism of this new approach is further disclosed via experimental investigations and numerical simulations. Nineteen groups of electrochemical deposition experiments are conducted with different electrochemical parameters. When the concentration ratio
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Stability analysis of a granite-based geopolymer sealant for CO2 geosequestration: In-situ permeability and mechanical behavior while exposed to brine Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-11 Seyed Hasan Hajiabadi, Mahmoud Khalifeh, Reinier van Noort
When considering the use of geopolymers (GPs), as potential alternatives for Portland cement, high durability during exposure to brine at encountered downhole is a key requirement. This study delves into the response of a granite-based GP system designed especially for CO-geosequestration upon exposure to brines with different concentrations of NaCl. Exposure was carried out by imposed flow in a triaxial
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Micro-assessment of heavy metal immobilization within alkali-activated copper tailings-slag geopolymer Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-10 Conglin Chen, Hao Liu, Yang Zhang, Gonghui Gu, Jianying Hu
To address the challenge of mitigating heavy metal pollution stemming from the utilization of industrial solid wastes like copper tailings, this study focused on the development of copper tailings-granulated blast furnace slag (CT-GBFS) geopolymer through alkali activation. The primary objective was to effectively immobilize heavy metals, specifically copper (Cu) and zinc (Zn), within the geopolymer
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A novel mesoscale modelling method for steel fibre-reinforced concrete with the combined finite-discrete element method Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-08 Zi-Qi Tang, Zhen-Yu Yin, Yin-Fu Jin, Xi-Wen Zhou
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Combined printable and mechanical analysis of 3D-printed green high-strength, lightweight engineered cementitious composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-07 Hongxiang Gou, Massoud Sofi, Zipeng Zhang, Mintao Zhu, Hongbo Zhu, Priyan Mendis
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Study on the hydration reaction and pore structure of ecologically recycled mortar with corn cob aggregates Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-07 Yu Zhao, Kun Zhang, Chaolin Wang, Mingxuan Shen, Jing Bi, Kunpeng Zhang
Ecologically recycled mortar with corn cob aggregates becomes a research hotspot. However, corn cobs consist of organic materials which have a negative impact on the hydration process of cement. Therefore, a knowledge of the effects of corn cob particle dosage on the hydration reaction process and microscopic pore is important. In this study, nuclear magnetic resonance (NMR) was used to quantitatively
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Compressive behaviour and microstructure of geopolymer mortar subjected to cryogenic freeze-thaw cycle: Effects of cycles and polypropylene fiber Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-06 Hongen Zhang, Wei Chen, Bei He, Xinping Zhu, Zhengwu Jiang
The in-depth investigation on mechanical and microstructural properties of cementitious materials subjected to cryogenic freeze-thaw cycles (CFTCs) is essential to efficiently improve their resistance to CFTCs. This study examines the effects of CFTCs ranging from 20 °C to −170 °C up to 9 cycles on geopolymer mortars (GPMs), including the role of polypropylene (PP) fiber on their responses to CFTCs
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Meso-scale simulation of moisture transport in concrete during wet-dry cycles using 3D RBSM conduit model with variable diffusion model Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-06 Dawei Ren, Punyawut Jiradilok, Dheeraj Waghmare, Kohei Nagai
This paper introduces the 3D RBSM Conduit model, an improved simulation program based on the Rigid Body Spring Model (RBSM), designed to accurately depict the intricate phenomenon of moisture transfer within concrete. This is achieved by incorporating an expanded diffusion model into the simulation framework. The diffusion coefficient is dynamically adjusted at each location and at each time step to
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A potential active rheology control approach for 3D printable cement-based materials: Coupling of temperature and viscosity modifiers Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-05 Yi Zhang, Qiang Ren, Xiaodi Dai, Yaxin Tao, Yiyuan Zhang, Zhengwu Jiang, Kim Van Tittelboom, Geert De Schutter
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Synthesis and properties of biomass derived carbon/PEG composite as photothermal conversion effective phase change material for functional concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2024-03-04 Chaowei Zheng, Ziye Huang, Dongyu Wang, Zehui Ju, Zuhua Zhang, Haiyang Zhang, Yingcan Zhu, Zhengwu Jiang
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New insight on particle migration of concrete under pumping based on X-ray computed tomography Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-29 Xiangyu Xie, Xuemei Liu, Lihai Zhang
It has been well known that pumpability of concrete is dominated by the lubrication layer formed at the interface between the concrete and pipe wall. However, the influence of shear rate effect and the wall effect in pumpability are far from well understood. In this paper, the X-ray Computed Tomography (CT) was firstly used to reconstruct the particle distribution in the pipe flow of fresh concrete
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Optimization of printing precision and mechanical property for powder-based 3D printed magnesium phosphate cement using fly ash Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-29 Xiongfei Liu, Nan Wang, Yi Zhang, Guowei Ma
Fly ash (FA) is employed to optimize the hydration process of powder-based (inkjet) 3D printed magnesium phosphate cement (MPC), aiming to enhance the printing precision and mechanical properties of powder-based 3D printed structures. This paper systematically evaluates the effects of FA on the printability, printing precision, and mechanical properties of printed MPC. In addition, SEM, XRD, and X-CT
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Factors affecting free chloride contents of hardened cement paste with a low water-to-binder ratio determined by rapid water extraction Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-27 Yifan Zhao, Xiang Hu, Huang Li, Tavio Tavio, Caijun Shi
This paper assesses the free chloride content in hardened cement paste with a low water to binder (w/b) ratio by a proposed water extraction method. Key parameters including extraction time, particle size of the sample, types and concentrations of chloride salts are thoroughly investigated to understand their effects on the extraction results. The findings reveal that the increase of extraction time
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Unveiling the synergistic effect of in-situ generated calcium carbonate by CO2 mixing on the reaction of calcined clay Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-25 Yemin Dong, Kunjie Shen, Hongwei Zhu, Chuanlin Hu, Fazhou Wang
This study investigates the effect of in-situ generated calcium carbonate by CO mixing on the reaction of calcined clay and demonstrates that the in-situ generated calcium carbonate remarkably accelerates the reaction of calcined clay. The mechanism is revealed through the application of multiple techniques and thermodynamical modeling. The in-situ generated calcium carbonates are generally nano/micro-particles
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Influence of hybrid steel-polyacrylonitrile fibers on the mechanical toughness and freeze-thaw resistance of sulfoaluminate cement composites Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-24 Junfeng Wang, Renshuang Zhang, Qi Luo, Liulei Lu, Feng Zhang, Qionglin Fu, Binbin Li, Feng Xing
Sulfoaluminate cement (SAC), an environmentally friendly low-carbon cement, is commonly applied for rapid repair and construction. However, limited studies were conducted to elevate the performance of SAC-based materials by using the hybrid fiber modification, especially the durability. This study investigated the mechanical behaviors and freeze-thaw (F-T) resistance of SAC-based materials with hybrid
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Transfer learning enables prediction of steel corrosion in concrete under natural environments Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-24 Haodong Ji, Ye Tian, Chuanqing Fu, Hailong Ye
Existing machine learning (ML) models for corrosion rate prediction of steel in cementitious materials are typically established based on laboratory datasets obtained under controlled material and environmental conditions, which questions their applicability to more realistic and complex scenarios. Transfer learning (TL), as a branch of ML, can extract knowledge from a source domain, which can be utilized
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3D printed concrete with sewage sludge ash: Fresh and hardened properties Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-23 Tao Ding, Kaige Shen, Chen Cai, Jianzhuang Xiao, Xuwen Xiao, Wan Liang
In this study, the possibility of application of sewage sludge ash (SSA) in 3D printed concrete (3DCP) technology was explored. The replacement of partial cement with SSA in the concrete mix design was investigated, followed by a comprehensive analysis of its impact on the workability, printability, and mechanical properties of the 3DCP. The findings indicated that the incorporation of SSA accelerated
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A conceptual design of two-stream alkali-activated materials Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-23 Yubo Sun, Manu K. Mohan, Yaxin Tao, Yi Zhang, Kim Van Tittelboom, Guang Ye, Geert De Schutter
To properly control the reaction kinetics and fresh properties evolution in conventional alkali-activated materials (AAMs), a conceptual design of two-stream AAMs has been proposed in this study. This is achieved by dividing the solid and liquid components in AAMs, including blast furnace slag (BFS) and electric arc furnace slag (EFS) precursors, as well as aqueous sodium hydroxide and silicate activators
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Effect of vehicle-induced vibration on the strength, nano-mechanical properties, and microstructural characteristics of ultra-high-performance concrete during hardening process Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-22 Jingchen Leng, Jun Yang, Zhongya Zhang, Jiang Du, Yang Zou, Jianting Zhou
Ultra-high-performance concrete (UHPC) has been rapidly accepted in accelerating bridge construction attributed to its superior workability and mechanical performance. However, the unavoidable vehicle-induced vibration in construction site may cause the performance degradation of UHPC, and the influencing mechanisms have not been well-documented. In this study, the effects of various vibration parameters
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Hardened property changes due to the pumping process of self-consolidating concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-20 Fumin Li, Wenkai Shen, Qiang Yuan, Zheng Chen, Shuqing Zhang, Youhong Ji, Rong Zeng, Youwu Wu, Lilin Lao, Caijun Shi
Pumping of self-consolidating concrete (SCC) is a vital construction technique. Curiosities are aroused by the effect of this intense physical process on the hardened properties of SCC. To examine this issue, a total of seven SCC mixtures are pumped at constant flow rates in pipelines with lengths of 324, 600, and 912 m. Parameters related to the hydration stages, air-void system, compressive strength
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Experimental investigation into the self-carbonation mechanism of magnesium oxide carbon sequestration foamed concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-20 Xiang Zhang, Songyu Liu, Kai Wu, Zhenyang Yuan
A novel technique involves the preparation of foamed concrete utilizing MgO as a substitute for Portland cement (PC) and CO foam in place of air foam. This technique is referred to as “magnesium oxide (MgO) carbon sequestration foamed concrete (MCFC)" that enables self-carbonation of Reactive MgO cement-based concrete under ambient conditions without any accelerated carbonation curing conditions. The
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The secret of ancient Roman hydraulic mortar: the lesson learnt from the past for future cements Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-20 Laura Medeghini, Laura Calzolari, Michela Botticelli, Melania Di Fazio, Caterina De Vito, Ida Pettiti, Fabrizio Bardelli, Silvano Mignardi
is an ancient Roman aqueduct, built to supply water to the ancient city of Rome and still working nowadays. This work is focused on the characterization of its mortars, and in particular the binders, to identify the reasons of such a durable resistance. Samples collected inside the aqueduct were analysed by Optical Microscopy (OM) in thin sections, X-ray Powder Diffraction (XRPD), Scanning Electron
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Effects of hygrothermal and natural aging on the durability of multilayer insulation systems incorporating thermal mortars with EPS and aerogel Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-19 João L. Parracha, Rosário Veiga, Lina Nunes, Inês Flores-Colen
This study evaluated the durability of three innovative multilayer insulation systems incorporating thermal mortars with EPS aggregates and silica aerogel granules after hygrothermal accelerated aging and one year of natural aging at an urban site in Portugal. The loss of performance was assessed after the accelerated aging and every three months of natural aging using non-destructive testing. Chemical-morphological
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Hydration kinetics of cation exchanged clinoptilolite zeolite based cementitious materials Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-17 M. Shariful Islam, Joseph J. Biernacki, Benjamin J. Mohr
This paper provides information on the global reaction path and hydration kinetics of a natural clinoptilolite-Ca zeolite blended portland cementitious system. The replacement of up to 20% as-received clinoptilolite-Ca zeolite with portland cement substantially minimized the tricalcium aluminate (CA) peak heat of hydration as observed using isothermal calorimetry. Inductively coupled plasma-optical
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Synthesis of geopolymer composites using bauxite residue-based spheres as aggregate: Novel and eco-friendly strategy to produce lightweight building materials Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-15 Zélia Alves, Luciano Senff, Konstantinos Sakkas, Iakovos Yakoumis, João A. Labrincha, Rui M. Novais
In this study, and for the first time, highly porous red mud-based geopolymer spheres were produced, through a very simple and scalable procedure, and used as lightweight aggregate in the synthesis of geopolymer composites. To further demonstrate the potential of this unexplored route, a comparison with composites containing expanded perlite and expanded vermiculite was also performed. The sample produced
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Understanding the CaCO3 phase transition of carbonated wollastonite composites caused by sodium tripolyphosphate: From amorphous to crystalline Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-15 Lulu Cheng, Yuxuan Chen, Tao Liu, H.J.H. Brouwers, Qingliang Yu
Developing new cementitious materials through mineral carbonation attracts increasing attention for reducing carbon emissions. However, the role of CaCO phase transition in the strength development of carbonated composites is not clear. In this study, new carbonated wollastonite composites are prepared and sodium tripolyphosphate (STPP) is used as a phase-controlling additive for the phase transition
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Effect of corrosion pit distribution of rebar on pore, and crack characteristics in concrete Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-13 Jaber Taheri-Shakib, Adil Al-Mayah
This research paper delves into the impact of corrosion-induced changes, particularly pit distribution, on pore structures and crack propagation in concrete subjected to galvanostatic accelerated corrosion. Two samples with different pit configurations were investigated—one with larger and spread pits, the other with smaller and localized ones. Various characterizations methods were applied including
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Understanding the setting behaviours of alkali-activated slag from the dissolution-precipitation point of view Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-12 Xiaohong Zhu, Mingyu Luan, Desha Tang, Kai Yang, Changhui Yang
Ground granulated blast-furnace slag (GGBS) is widely used as supplementary cementitious material of interest for adjusting the performance of concrete. Unlike standard commercial products, characteristics of GGBS from different iron manufacturers vary significantly and assessment of its reactivity, especially at an early age, is not well-established despite numerous parameters specified in current
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Low-carbon, expansive engineered cementitious composites (ECC) in the context of 3D printing Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-09 Wen Zhou, He Zhu, Wei-Hsiu Hu, Ryan Wollaston, Victor C. Li
Shrinkage and high carbon footprint are two significant challenges in the application of printable cementitious materials. To address these concerns, low-carbon, expansive, printable engineered cementitious composites (ECC) with appropriate mechanical properties were designed and validated. Limestone calcined clay cement (LC3)-based ECC combined with calcium sulfoaluminate cement (CSA) was adopted
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Mechanical characterization of high-strength and ultra-high-performance engineered cementitious composites reinforced with polyvinyl alcohol and polyethylene fibers subjected to monotonic and cyclic loading Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-08 Mahyar Ramezani, Osman E. Ozbulut, Muhammad M. Sherif
This paper aims to comparatively evaluate the compressive and flexural response of high strength and ultra-high-performance polyvinyl Alcohol (PVA)- and polyethylene (PE)-reinforced ECCs at fiber contents of 1.75 vol% and 2.25 vol%, utilizing the same base mixture design. The base mixture was formulated with the objective of reducing the reliance on Portland cement by replacing 55% of it with supplementary
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Retraction notice to “Influence of magnetized water and water/cement ratio on the properties of untreated coal fine aggregates concrete” [Cement Concr. Compos. 122 (September 2021) 104121] Cement Concrete Comp. (IF 10.5) Pub Date : 2024-02-07 Arash Karimipour, Mahmoud Edalati, Jorge de Brito