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Optimization of fresh concrete pumping pressure loss with CFD-DEM approach Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-19 Shengqiang Jiang; Xiaodong Chen; Guodong Cao; Yuanqiang Tan; Xiangwu Xiao; Yupeng Zhou; Sisi Liu; Zhenggang Tong; Yihui Wu
In this study, a three-dimensional model of a concrete pump truck conveying pipe was established, and a computational fluid dynamics-discrete element method (CFD-DEM) coupling model was used to simulate the pumping process of fresh concrete in different pipes. The influences of the structural parameters and inclination angles of the taper pipe, bend pipe, and their combination on the pressure loss
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Characterization of a textile waste nonwoven fabric reinforced cement composite for non-structural building components Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-19 Payam Sadrolodabaee; Josep Claramunt; Monica Ardanuy; Albert de la Fuente
Large amounts of nonrenewable resources are depleted by the construction industry in addition to the generation of million tons of mineral waste and carbon dioxide gas every year. For the sake of a more sustainable consumption pattern of building materials, as well as for reducing the waste flux to landfills, the use of recycled materials and wastes should be researched and motivated. In this sense
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Experimental evaluation of adobe mixtures reinforced with jute fibers Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-19 G. Araya-Letelier; F.C. Antico; C. Burbano-Garcia; J. Concha-Riedel; J. Norambuena-Contreras; J. Concha; E.I. Saavedra Flores
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Nanoscale insight on the initial hydration mechanism of magnesium phosphate cement Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-19 Yue Li; Guosheng Zhang; Dongshuai Hou; Zigeng Wang
The hydration rate, microstructure, mechanical properties and durability of Magnesium phosphate cement (MPC) prepared by different kinds of phosphates are quite different. These differences in macroscopic properties are essentially determined by microscopic chemical reactions. Therefore, in this paper, the adsorption mechanism of MgO interface to water and ions in the initial hydration process of MPC
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Investigation of the adhesive and cohesive properties of asphalt, mastic, and mortar in porous asphalt mixtures Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-19 Xiaowei Wang; Jiaxing Ren; Xingyu Gu; Ning Li; Zeyu Tian; Hongqing Chen
The adhesive and cohesive properties of asphalt, mastic, and mortar in the same porous asphalt (PA) mixture essentially control the durability and failure mechanism of PA mixtures. A typical PA mixture with three types of asphalt was investigated, and the corresponding asphalt, mastic, and mortar were also designed. Binder bond strength (BBS) test was used to evaluate the adhesion and cohesion (Ad/Co)
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One-part alkali-activated blast furnace slag for sustainable construction at subzero temperatures Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Ahmad Alzaza; Katja Ohenoja; Mirja Illikainen
The construction season is limited in northern countries due to the severe cold weather conditions and their detrimental impacts on concrete quality. Thus, there are excessive expenses required annually for insulation and energy-intensive heating systems for cold-weather concreting. This experimental study aimed to investigate the potential of using high-strength one-part alkali-activated blast furnace
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Study on waste engine oil and waste cooking oil on performance improvement of aged asphalt and application in reclaimed asphalt mixture Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Haibin Li; Fan Zhang; Zixuan Feng; Wenbo Li; Xiaolong Zou
This paper studies the effects that varying amounts of waste cooking oil (WCO) and waste engine oil (WEO) have on the rejuvenation effect of aged asphalt, and the road performance of the 7% compound regenerant to different contents of RAP. The basic performance tests demonstrated the regeneration effect of waste oil, while the microscopic test and chemical composition analysis revealed the regeneration
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Verification of concrete nonlinear creep mechanism based on meso-damage mechanics Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-16 Yu Li; Sheng Qiang; Wenqiang Xu; Xia Hua; Chao Xu; Jiayu Lai; Min Yuan; Bo Chen
In order to study the nonlinear creep mechanism of concrete materials, predict and evaluate the safety of the structure, uniaxial nonlinear creep tests of concrete specimens under different ages and stress-strength ratios (σ/fc) were carried out. Based on the discrete element theory (DEM), a concrete three-phase numerical simulation model is established, which considers the real aggregate shape and
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Dimensionally stable and highly durable bamboo material prepared through a simple surface furfurylation Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Minghui Liu; Wanju Li; Fei Guo; Hankun Wang; Xuexia Zhang; Yan Yu
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Point-load test and UPV for compressive strength prediction of recycled coarse aggregate concrete via generalized GMDH-class neural network Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Hossein Razzaghi; Rahmat Madandoust; Hassan Aghabarati
This study deals with using a neural network in generalized Group Method of Data Handling (GMDH) type successfully to model and predict the standard cube strength of SFRRCAC (steel fiber reinforced recycled coarse aggregate concrete) based on the data obtained experimentally through point-load test (PLT) and ultrasonic pulse velocity (UPV) approaches. Two methods of singular value decomposition (SVD)
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Physical, mechanical, and durability characteristics of newly developed thermoplastic GFRP bars for reinforcing concrete structures Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-16 Brahim Benmokrane; Salaheldin Mousa; Khaled Mohamed; Mahmoud Sayed-Ahmed
This paper presents the results of an investigation into the use of newly developed thermoplastic-based glass fiber-reinforced polymer (GFRP) bars as reinforcement in concrete structures. GFRP bars made with thermoplastic resins have an advantage over thermosetting-based ones in that they can be shaped after initial production of a straight profile, similar to conventional steel bars. In addition,
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Improving the properties of concrete using in situ-grown C-S-H Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Feifei Zhou; Ganghua Pan; Renjie Mi; Mimi Zhan
Enhancing the properties of concrete using C-S-H seed has been a challenging task due to its agglomeration in the cement matrix. Here, for ensuring synthetic C-S-H disperse well in the cement matrix, it was first synthesized in situ on fly ash (FA) by co-precipitation method, and the C-S-H grown in situ on FA (C-S-H@FA) was received. And then, its phase composition, morphology and particle size distribution
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Influence of specimen geometry on mode I fracture toughness of asphalt concrete Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-16 Si Fuan; Ma Ke; Liu Kanghe; Li Kun; M.R.M. Aliha
Determination of fracture toughness (KIc) for the asphalt mixture concrete requires employment of suitable testing methods and specimens. Disc-shape specimens are among the favorite test geometries for conducting the fracture toughness experiments on asphalt concrete materials since they can be manufactured easily from those samples obtained by the gyratory compactor machine. Semi-circular bend (SCB)
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Flexural fatigue behaviour of a heated ultra-high-performance fibre-reinforced concrete Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-16 José D. Ríos; Héctor Cifuentes; Sergio Blasón; Manuel López-Aenlle; Antonio Martínez-De La Concha
A comprehensive experimental campaign was carried out to assess the flexural fatigue behaviour of an ultra-high-performance fibre-reinforced concrete. Several concrete mixes were submitted to room temperature, 100 °C, 200 °C, and 300 °C. Two types of reinforcement were explored: steel fibres and a combination of steel and polypropylene fibres. The influence of the addition of fibres and the temperatures
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A comparative study on physicochemical properties of environmentally-friendly lightweight bricks having potato peel powder and sour orange leaf Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-17 Mona Ghorbani; Behnaz Dahrazma; Seyed Fazlolah Saghravani; Ghazaleh Yousofizinsaz
Using plant residues in building materials may reduce both short and long-term effects on the environment. In this paper, we used potato peel powder (PPP) to investigate the effects of this residue on sound insulation and other physicochemical properties. To achieve the optimal properties of the bricks, we utilized three percentages of dried PPP. We dried bricks and then fired them in the kiln at 1000 °C
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Lime/pozzolan/geopolymer systems: Performance in pastes and mortars Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Ariel R. Villca; Lourdes Soriano; Alba Font; Mauro M. Tashima; José Monzó; Maria Victoria Borrachero; Jordi Payá
Use of lime as construction material is limited mainly by low initial strength. These properties can be improved by adding pozzolanic materials, but the evolution of the reaction usually needs older ages than 7 days. Alkali-activated materials, or geopolymers, are good-performance materials that can be produced with residual waste. The combination of traditional and new materials can lead to new uses
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Carbonation of blended cement concretes after 12 years of natural exposure Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Federica Lollini; Elena Redaelli
In urban environments, the durability of reinforced concrete structures is limited by carbonation-induced corrosion. To prevent steel corrosion, the selection of a proper concrete in terms of type of binder, water/binder ratio and curing time, is of fundamental importance. At this aim the knowledge of the resistance to carbonation in the exposure environment is required. Usually carbonation is evaluated
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Experimental study on fracture behaviour of concrete after low-cycle reciprocating loading Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-15 Wenhu Zhao; Chengbin Du; Liguo Sun; Xiaocui Chen
To fully understand the fracture behaviour of concrete after low-cycle reciprocating loading, a series of experiments are carried out using compact tension specimens. An improved wedge splitting device for adaptive loading is proposed to relieve the brittle unloading process during the concrete fracture tests. Due to the additional springs, the complete stress–strain curves representing concrete fracture
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Utilization of CO2 cured CSW-MSWIBA cold bonded aggregate into lightweight concrete products for masonry units Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Yohannes L. Yaphary; Jian-Xin Lu; Bin Zhao; Hiu Wun Cheng; Peiliang Shen; Dongxing Xuan; Chi Sun Poon
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Fatigue damage numerical simulation of cement-treated base materials by discrete element method Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Xiaokang Zhao; Qiao Dong; Xueqin Chen; Yuanjie Xiao; Debiao Zheng
Fatigue failure of the cement-treated base (CTB) is always paid more attention by highway constructors. Meso-scale cracking evolution plays an essential role in the research of fatigue deterioration mechanism, which is hard to be characterized using experimental techniques alone. The objective of this paper is to investigate the fatigue behaviour of CTB materials under cyclic loading through the discrete
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Evaluation on mechanical behavior of asphalt concrete trackbed with slab panel using full-scale static and dynamic load test Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Seong-Hyeok Lee; Ki-Young Eum; Tri Ho Minh Le; Dae-Wook Park
In this study, a full-scale model of a railway track structure using an asphalt concrete trackbed with concrete slab panel (ACTSP) is developed. Slab panels are very important to develop asphalt concrete (AC) track system for minimizing the roadbed pressure due to the trainload and reducing the plastic deformation of the AC. The purpose of this study is to analyze the performance of the subgrade and
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Heat dissipation in bituminous asphalt catalyzed by different metallic oxide nanopowders Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Farsan Ali Qureshi; Naveed Ahmad; Hafiz Muhammad Ali
The conventional bitumen, which is very sensitive to temperature, used in roads construction has very low thermal conductivity due to which heat absorbed is accumulated within it and a very less fraction of it is dissipated. Nanotechnology was introduced to overcome this issue where bitumen was modified by several metallic oxide powders at nanoscale. Nano-TiO2, nano-ZnO and nano-Al2O3 were mixed with
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A multi-index synthetical evaluation of pull-out behaviors of hooked-end steel fiber embedded in mortars Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Xinxin Ding; Minglei Zhao; Changyong Li; Jie Li; Xusheng Zhao
Focusing on the fundamental issue of the bond performance of steel fiber in cementitious matrix of concrete, a multi-index synthetical evaluation was carried out to link the bond mechanisms to the features of complete load-slip curve of hooked-end steel fiber under a pull-out test. The features of curve at ascending portion, peak and descending portion of hooked-end steel fiber embedded in mortar were
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Structural kinetics constitutive models for characterizing the time-dependent rheologic behaviors of fresh cement paste Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Dafu Wang; Yunsheng Zhang; Jia Xiao; Tingjie Huang; Meng Wu; Shenghao Zuo; Yonggan Yang
The development of microstructure of cement-based materials should be mainly responsible for the time dependences of their rheological properties. In this paper, a series of structural kinetics constitutive models were established to predict the time-evolutions of the rheological properties of fresh cement paste under different working conditions. The models were developed from the Hershel-Bulkley
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Mechanical response analysis of asphalt pavement on concrete curved slope bridge deck based on complex mechanical system and temperature field Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Mingyang Gong; Beichen Zhou; Jingyun Chen; Yiren Sun
Curved concrete bridges with small radii and large longitudinal slopes are important parts of viaduct ramp, on which the asphalt pavement plays an important role in resisting and dispersing traffic loads. Due to the complexity of curved concrete bridge structures with small radii and large longitudinal slopes, the asphalt pavement is subjected to complex mechanical action under loading. This study
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Dynamic bond behaviour of fibre-wrapped basalt fibre-reinforced polymer bars embedded in sea sand and recycled aggregate concrete under high-strain rate pull-out tests Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Zhe Xiong; Wei Wei; Shaohua He; Feng Liu; Hanwei Luo; Lijuan Li
Using sea sand instead of river sand and recycled coarse aggregates instead of natural coarse aggregates to prepare sea sand and recycled aggregate concrete (SSRAC) can help preserve sand and stone resources, reduce construction costs, and protect ecological environments. However, the chloride ions in sea sand corrode steel bars, posing a safety risk to concrete structures. Fibre-reinforced polymer
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Contribution of fly ash to the strength development of mortars cured at different temperatures Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-14 Yuko Ogawa; Kimitaka Uji; Atsushi Ueno; Kenji Kawai
This study aims to determine the contribution of fly ash to the compressive strength development of mortars cured at different temperatures based on the cementing efficiency factor. The strength development of mortar specimens with different fly ash replacement ratios cured at 10 °C, 20 °C, and 30 °C was analyzed considering the apparent activation energy. Subsequently, the contribution of fly ash
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Analyzing the filler and activity effect of fly ash and slag on the early hydration of blended cement based on calorimetric test Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-13 Meng Wu; Shiyu Sui; Yunsheng Zhang; Yantao Jia; Wei She; Zhiyong Liu; Yonggan Yang
To increase the utilization rate of supplementary cementitious materials (SCMs), the filler effect and activity effect of low-calcium fly ash (LFA) and ground granulated blast furnace slag (GGBFS) on the early hydration of blended cement were analyzed based on calorimetric test. The test results showed that the full-width at half-maximum (FWHM) value of exothermic peak from calorimetric test could
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Interesting phenomena for Al-Zn-Mg aluminum alloy after two years of storage: A comparative study on microstructure, mechanical properties and corrosion behavior of aluminum alloy with different aging treatments Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-13 Pan Liu; Qin-Hao Zhang; Ji-Ming Hu; Fa-He Cao
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Sustainable application of processed TBM excavated rock material as green structural concrete aggregate Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-13 Ahmed Alnuaim; Yassir M. Abbas; M. Iqbal Khan
In this study, we investigate the potential use of the material excavated by tunnel boring machines (TBMs) as structural concrete aggregate. Accordingly, several experimental and statistical investigations on the mechanically and thermally processed material were carried out. The raw TBM excavated material contained a considerable amount of macro–micro quartz sand. Additionally, the poor-grain size
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Recent advances in molecular dynamics simulation of the N-A-S-H geopolymer system: modeling, structural analysis, and dynamics Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-11 Ling-Yu Xu; Yazan Alrefaei; Yan-Shuai Wang; Jian-Guo Dai
Geopolymer binders have attracted considerable attention in experimental research, in which their formation mechanism, molecular structure types, and the evolution of their amorphous products have been identified to a wide extent. However, significant challenges and barriers were found in the numerical modeling of such kind of materials. This paper reviews the recently released molecular dynamics (MD)
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Determination of shear strength by Iosipescu (V-notch) method of metakaolin-based geopolymeric resins activated by different silicate and hydroxide combinations Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-09 Joadelio Chagas Soares; Dylmar Penteado Dias; Eduardo Atem de Carvalho; Jodimar Soares de Azevedo
Geopolymers (inorganic polymers) were developed and patented by Joseph Davidovits in the 1970’s and have gained significant attention in the civil construction industry. Since then, the properties of geopolymers have been studied by many researchers, such as their use as a repair material on reinforced concrete structures. Thus, this study aimed to evaluate the mechanical properties of metakaolin-based
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Multi-scale characterization on behaviors of the interface between magnesium phosphate cement and portland cement Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-09 Fei Liu; Baofeng Pan; Peng Cao; Changjun Zhou
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Freeze-thaw and wetting-drying effects on the hydromechanical behavior of a stabilized expansive soil Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-09 Lu-qiang Ding; Sai K. Vanapalli; Wei-lie Zou; Zhong Han; Xie-qun Wang
This study evaluates the effects of post-compaction wetting–drying (WD) process, freeze–thaw (FT) cycles and cement content (CC) on the microstructure, volumetric strain (εv), soil–water characteristic curve (SWCC), resilient modulus (MR), unconfined compressive strength (qu), and reloading modulus (E1%) and axial stress (Su1%) at 1% strain level of a cement-stabilized expansive soil. The specimens
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Effects of K-struvite on hydration behavior of magnesium potassium phosphate cement Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-09 Bo Pang; Jun Liu; Baomin Wang; Runqing Liu; Yuanquan Yang
Increasing the amount of final hydration products of magnesium potassium phosphate cements (MKPC) can improve its mechanical properties and increase its application diversity. This work investigates the influence of the MgKPO4·6H2O (K-struvite) on the hydration behavior and mechanisms of MKPC with Mg/P ratio of 6 at w/c ratio of 0.3. The results indicate the number of exothermic peaks decreases with
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Experimental investigation of small-scale clay blocks masonry walls with chases under compression Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-10 Alisson Simonetti Milani; André Lübeck; Gihad Mohamad; Almir Barros da Silva Santos Neto; Jaelson Budny
The clay block structural masonry is the most common building system in Brazil, being used even in buildings with ten or more floors. Sometimes, when the buildings are already in use and the total load is fully completed, the dwellings users need to change hydraulic, gas or electrical installation position in masonry walls, cutting the structural elements. This is the most critical problem for building
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Strength evolutions of varying water content-dredged sludge stabilized with alkali-activated ground granulated blast-furnace slag Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-08 Lei Lang; Bowen Chen; Bing Chen
The variation of water content significantly affects the strength development of stabilized dredged sludge (DS), as well as the rational use of binder. This paper experimentally studies the strength and microstructure evolutions of DS stabilized with alkali-activated ground granulated blast-furnace slag (GGBS) under different water contents, via a range of unconfined compressive strength (UCS), X-ray
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Effect of chopped carbon fiber on interfacial behaviors of ICCP-SS system Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-08 Wan-qian Li; Chun Pei; Yaoteng Zhu; Ji-Hua Zhu
In the present work, chopped carbon fibers (CFs) were incorporated into a CF-reinforced cementitious matrix (C-FRCM) and are considered to be an operative reinforcement material with a good compatibility with concrete. The interfacial bonding between the C-FRCM and concrete was evaluated by pull-off and double-shear tests. The pull-off and shear strengths of the C-FRCM with chopped CFs were enhanced
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Prediction of the resilient modulus of non-cohesive subgrade soils and unbound subbase materials using a hybrid support vector machine method and colliding bodies optimization algorithm Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-08 Nasrin Heidarabadizadeh; Ali Reza Ghanizadeh; Ali Behnood
The resilient modulus (MR) of road materials is one of the most important parameters in the analysis and design of pavement. This parameter is used in both empirical methods and mechanistic-empirical methods as the main parameter for expressing the stiffness and behavior of road construction materials. To determine this parameter in the laboratory, it is necessary to perform a dynamic tri-axial loading
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Cementless controlled low-strength material (CLSM) based on waste glass powder and hydrated lime: Synthesis, characterization and thermodynamic simulation Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-08 Rui Xiao; Pawel Polaczyk; Xi Jiang; Miaomiao Zhang; Yanhai Wang; Baoshan Huang
Sustainable infrastructure materials are always correlated with the innovative and value-added disposal of solid waste. This study investigates the production of cement-free controlled low strength material (CLSM) depending on the pozzolanic reaction between waste glass powder (GP) and hydrated lime (CH). CLSM mixtures with varying GP/CH ratios were characterized by flow consistency, mechanical properties
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Constitutive modelling and mechanical properties of cementitious composites incorporating recycled vinyl banner plastics Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-08 D.V. Bompa; B. Xu; A.Y. Elghazouli
This paper describes an experimental study, which has been lacking to date, into the mechanical properties of cementitious composites incorporating granules and fibres from recycled Reinforced PVC (RPVC) banners. A detailed account of over 140 tests on cylindrical, cubic and prismatic samples tested in compression and flexure, with up to 20% replacement of mineral aggregates, is given. Based on the
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Extended life concrete bridge decks utilizing internal curing to reduce cracking – Materials characterization and engineering demonstration Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-08 Xuhao Wang; Pengfei Song; Haiyang Yu; Peter Taylor; Seyedhamed Sadati; Katelyn Freeseman; Yingjie Ning
There is an ongoing concern about premature cracking of concrete bridge decks. Bridge deck cracking reduces the service life of bridges and results in increased maintenance and replacement costs. Ideally, a deck should last as long as the support structure with minimal maintenance. However, bridge decks typically need to be replaced two or more times before the structure needs to be replaced. Such
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Recycling flue gas desulfurisation gypsum and phosphogypsum for cemented paste backfill and its acid resistance Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Shiyu Zhang; Yingliang Zhao; Hangxing Ding; Jingping Qiu; Zhenbang Guo
This paper aims to explore the potential use of flue gas desulfurisation gypsum (FGDG) and phosphogypsum (PG) into cemented paste backfill (CPB). The mechanical strength of CPB and the binder paste properties (i.e., hydration heat, hydration evolution, acid erosion resistance, and leachability) were investigated experimentally. The results revealed that the addition of FGDG and PG significantly improved
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Using silica fume for improvement of fly ash/slag based geopolymer activated with calcium carbide residue and gypsum Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Peiliang Cong; Linna Mei
This study attempts to explore the feasibility of using calcium carbide residue (CCR) as a solid alkaline activator to prepare geopolymer binders. A mixture of fly ash and ground granulated blast furnace slag was activated with CCR to prepare one-part geopolymer. A conventional two-part geopolymer activated with sodium hydroxide (NaOH) solution was also made for comparison. The CCR-activated geopolymer
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Laboratory investigation of the performance of binders and asphalt mixtures modified by carbon nano tube, poly phosphoric acid, and styrene butadiene rubber Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Rezvan Babagoli
This study evaluated the performance characteristics of binders and Stone Matrix Asphalt (SMA) Mixtures modified by Poly Phosphoric Acid (PPA), Carbon Nano Tube (CNT), and Styrene Butadiene Rubber (SBR). In order to investigate the rheological behavior of bitumens, linear Amplitude Sweep (LAS), rotational viscosity, Dynamic Shear Rheometer, Bending Beam Rheometer, Multiple Stress Creep Recovery (MSCR)
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Mechanical properties and reinforcement mechanisms evaluation of closed-cell polymer foams reinforced by recycled glass beads Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Shunze Cao; Yuwu Zhang; Yang Lu
Particle reinforced (PR) polymer foams are promising materials for lightweight structures. In this research, compression tests were conducted on glass beads (GBs) reinforced linear low-density polyethylene (LLDPE) foams. The experimental results indicated that embedding GBs could increase the yield strength, elastic modulus and energy absorption capacity of bulk material. Analytical predictions of
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Investigation on preparation and multifunctionality of reduced graphene oxide cement mortar Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Shengtian Zhai; Bo Pang; Guojian Liu; Yu Zhang; Kaili Xu; Wei She; Yunsheng Zhang
For modern concrete materials and structures, how to realize the multifunctional application is still a challenge. The introduction of functional components into concrete materials is the most effective method. The present study successfully develops a new avenue to prepare rGO suspension with excellent dispersibility and stability through the combination of dispersant and ultrasonic pre-dispersion
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Confinement model for FRP-wrapped circular columns when the wraps are subjected to damage Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Akram Jawdhari; Abdeldayem Hadhood; Amir Fam
Fiber-reinforced polymer (FRP) wrapped concrete columns are vulnerable to accidental damage or vandalism, which may cause physical cuts or tearing of the jacket, thereby compromising the confined strength and ductility of the column. This paper aims at providing a simple tool to reassess the strength under a given level of damage. Finite element (FE) models were developed to examine a variety of cuts
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Cement composites with expanded graphite/paraffin as storage heater Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Maksymilian Frąc; Waldemar Pichór; Paulina Szołdra; Wojciech Szudek
The following paper presents the results of research on cement composites with expanded graphite/paraffin in terms of their application in accumulative heating systems. A novel approach, using expanded graphite simultaneously as an electric conductive and as a phase-change additive, is presented. A complex additive was prepared by means of the impregnation of expanded graphite (EG) with paraffin through
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Investigation of the variations in nonslip effects of a fluorine-based liquid antislip agent due to long-term wear from walking Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Suk-Won Ji; Rumi Kudo; Shintaro Fukuda; Soo-Kyung Choi
The purpose of this study was to verify the time-dependent changes in the nonslip effects of a fluorine-based liquid antislip agent applied to inorganic flooring materials. Based on the coefficient of slip resistance for shoes (CSR), the nonslip effects continued until 10,000–18,000 steps after applying the antislip agent in the Wet-1 condition. The nonslip effects were insignificant in the Wet-2 condition
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A new insight into the working mechanism of PCE emphasizing the interaction between PCE and Ca2+ in fresh cement paste Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Hongwei Tian; Xiangming Kong; Xia Miao; Lingfei Jiang; Xiaofan Pang
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Enhanced photocatalytic decomposition of NO on portland cement concrete pavement using nano-TiO2 suspension Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Chen Chen; Boming Tang; Xuejuan Cao; Fan Gu; Wei Huang
Photocatalyst titanium dioxide (TiO2) has been widely applied on asphalt and concrete pavements to mitigate the air pollution caused by traffic exhaust. In general, most of the TiO2 used in previous studies was pure anatase, which only exhibited excellent photocatalytic activity under ultraviolet (UV) light. Thus, N-doping method was selected to improve the photocatalytic activity, especially under
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Shear test on damage evolution of brick masonry based on acoustic emission technique Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-07 Shengli Li; Yanqi Wu; Wenxia Li; Panjie Li
Shear is the dominant mode of masonry structural failure. A shear test of brick masonry specimen based on acoustic emission (AE) monitoring was performed in this study to assess the damage state of masonry structure reliably. AE parameters and rate-process analysis were used to analyze the damage evolution of brick masonry in shear failure from qualitative and quantitative perspectives. Results showed
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Prediction of compressive strength of recycled aggregate concrete based on gray correlation analysis Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-06 Lihua Zhu; Cheng Zhao; Jun Dai
Recycled aggregate concrete (RAC) specimens with different water–cement ratios and replacement levels of recycled coarse aggregate (RCA) were prepared. The effects of these two factors on the slump and compressive strength of the RAC were analyzed. The Abrams formula was used to predict the compressive strength of the RAC. The relationships between the regression coefficients and physical properties
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Influence of a hybrid combination of steel and polypropylene fibers on concrete toughness Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-05 Hui Guo; Linzhi Jiang; Junlin Tao; Yu Chen; Zhiqin Zheng; Bin Jia
The toughening effect of a hybrid combination of steel and polypropylene fibers on high-strength concrete (HSC) is investigated using bending, quasi-static, and dynamic splitting tensile tests. The bending strength and quasi-static splitting tensile strength of polypropylene-fiber-reinforced HSC improves only when the volume fraction of polypropylene fiber reaches 0.22%. The bending strength of st
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Basic properties and mechanism of high activity phosphate-based slurry for dynamic water blocking-A feasibility research Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-06 Yijie Zhang; Jing Wang; Liping Li; Chuanyi Ma; Dongshuai Hou; Kai Wang; Shugang Wang
The water inflow into a karst pipeline is characterized by great flow rate and fast flow speed, which makes it difficult to block. Phosphate cement has the characteristics of rapid setting, fast hardening, and good interface bonding, which have inherent advantages for plugging pipelines. However, under the condition of high water ratio, whether the performance of phosphate cement can still maintain
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Structural investigation of carbonation and hydration process of hydraulic dolomitic binder Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-05 Inta Kirilovica; Inta Vitina; Liga Grase
The research deals with the microstructural examination of the hardening process of dolomitic binder synthesized from dolomite flour and clay. Such binder based on its suitable properties can be considered as a perspective alternative for restoration purposes of dolomitic Roman cement – a widely used construction binder in Riga during the late 19th and early 20th century. The structures formed during
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Orientation effect on the physical and mechanical properties of strand cement boards Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-06 Matheus Roberto Cabral; Erika Yukari Nakanishi; Sérgio Francisco Santos; André Luis Christoforo; Juliano Fiorelli
The aim of this study is to assess the effect of the strand orientation on the physical and mechanical properties of strand cement boards. To evaluate the orientation effect, non-oriented strand cement boards (i) and oriented strand cement boards (ii) were produced and assessed using two different wood species, with three-strand contents. The boards physical and mechanical properties were evaluated
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A heterogeneous micromechanical model for bituminous composites containing rigid and flexible particulates Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-05 Pouria Hajikarimi; Alireza Sadat Hosseini; Elham H. Fini
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Heavy metal ion adsorption by permeable oyster shell bricks Constr. Build. Mater. (IF 4.419) Pub Date : 2021-01-05 Chunhua Xia; Xueying Zhang; Linghui Xia
More than 60% of oyster shells (OS) are discarded on the beach, which pollute the soil. At 800 °C, OS completely cracks into calcium oxide (CaO), which has the physical adsorption characteristic of a mesoporous structure. The permeable oyster shell bricks (POSB) used for purifying water were made by improving the process with OS as an aggregate. The adsorption effect on heavy metal ions in landscape
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