Construction and Building Materials最新文献

{"title":"Hydration heat and hydration products evolution of PC clinker-C$-CSA cement ternary system containing ZIF-8-based composite phase change materials","authors":"Dandan Yan,&nbsp;Min Li,&nbsp;Chunxiang Qian","doi":"10.1016/j.conbuildmat.2025.140143","DOIUrl":"10.1016/j.conbuildmat.2025.140143","url":null,"abstract":"<div><div>Phase change materials are used in cementitious materials to reduce the hydration temperature rise and thus inhibit the temperature cracks generation. However, the influence mechanism of phase change materials on the hydration properties of cementitious materials is still unclear. In this study, ZIF-8-based composite phase change materials (CPCM) were added to the Portland cement (PC) clinker-anhydrite (C$)-calcium sulfoaluminate (CSA) cement ternary system (PCCSA) in the form of admixtures. The effects of controlling the phase change temperatures, dosages of CPCM and hydration temperatures on the hydration exothermic characteristics, hydration products and the compressive strength development in the PCCSA composite system were investigated. CPCM addition reduced the hydration exothermic rate and cumulative heat release of the ternary system, especially when the phase change temperature of CPCM was 25.8 ℃, and the larger the dosage, the more obvious the reduction effect. In addition, CPCM did not participate in the hydration reaction of the system, but promoted the formation of CH and AFm. Simultaneously, the compressive strength of the PCCSA system paste containing CPCM decreased due to increased porosity in the paste. Furthermore, elevated hydration temperature significantly improved the hydration rate of the system, while reduced the hydration degree, and the hydration products types of the system were not affected by the hydration temperatures. This study results are fundamental for predicting the hydration behavior of cement systems containing CPCM and promoting the application of composite phase change materials in cementitious materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140143"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A stress-path-independence hardening parameter for calcareous sand based on modified plasticity work","authors":"Mingxing Luo ,&nbsp;Yani Lu ,&nbsp;Xiaoxuan Liu ,&nbsp;Li Zhong ,&nbsp;Cai Wu ,&nbsp;Jiru Zhang","doi":"10.1016/j.conbuildmat.2025.140378","DOIUrl":"10.1016/j.conbuildmat.2025.140378","url":null,"abstract":"<div><div>The plastic strain of calcareous sand is related to its stress path and particle breakage, rendering the hardening process complex. An expression for the stress-path-dependence factor was developed by analyzing the variations in plastic strain across different initial void ratios. A stress-path-independent hardening parameter was derived from the modified plastic work and was subsequently validated. Constant-proportion loading tests on calcareous sands confirmed the applicability of this hardening model. The results indicated that under isotropic compression, the plastic volumetric strain increased with increasing average effective stress, albeit at a decreasing growth rate. A positive linear relationship was observed between the volumetric strain modulus and relative breakage index. The proposed hardening parameter effectively captured the particle breakage and stress path effects in calcareous sand and was validated through theoretical calculations and laboratory tests, offering valuable insights into the mechanical behavior of fragile granular soils.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140378"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine learning based optimization for mix design of manufactured sand concrete","authors":"Zhongxia Yuan ,&nbsp;Wei Zheng ,&nbsp;Hongxia Qiao","doi":"10.1016/j.conbuildmat.2025.140256","DOIUrl":"10.1016/j.conbuildmat.2025.140256","url":null,"abstract":"<div><div>Using manufactured sand (M-sand) as a replacement of natural sand is beneficial both environmentally and economically. However, apart from basic requirements like that for concrete using natural sand, mix design of manufactured sand concrete (MSC) needs to take more factors into consideration and requires more efficient optimization due to relative deficiency in testing data. This paper uses 86 instances of MSC with 6 features to predict compressive strength and chloride permeability coefficient (CPC) of MSC by employing four machine learning (ML) models (Back propagation (BP) neural network, random forest (RF), support vector regression (SVR) and eXtreme Gradient Boosting (XGBoost)). All four models have predicted the compressive strength and CPC of MSC accurately, with R² of test set ranging from 0.85 to 0.93 after hyperparameter optimization, with XGBoost models achieving the highest R² of 0.93 for both. Also, SHapley Additive exPlanations (SHAP) analysis indicates that cement content is the most predominant factor to affect compressive strength and CPC, followed by M-sand content and water/binder ratio (W/B ratio). Finally, CPC, compressive strength and unit cost are combined to construct a three-way fitness function and multi-objective optimization is performed using Non-Dominated Sorting Genetic Algorithm 2 (NSGA-II). Based on multi-algorithm comparison and cost-aware multi-objective XGBoost-NSGA-II optimization, the mix design method proposed is advantageous in terms of accuracy, reliability and production cost compared with ML models that employ a single model, predict a single property, and do not take in cost as a factor for mix design.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140256"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Axial compressive behavior of aluminum alloy thin-walled tube confined concrete","authors":"Jing-Xuan Wang ,&nbsp;Fang-ling Liu ,&nbsp;Shan Gao","doi":"10.1016/j.conbuildmat.2025.140350","DOIUrl":"10.1016/j.conbuildmat.2025.140350","url":null,"abstract":"<div><div>Aluminum alloy has been widely used in modern engineering structures due to its good corrosion resistance, light-weight, convenient processing, and recyclability. To avoid the local buckling of the aluminum alloy tubes under axial load, aluminum alloy thin-walled tubes are preferable for only providing confinement for the core concrete in composite structures. In this study, eighteen aluminum alloy thin-walled tube-concrete composite stubs were compressively tested. The failure phenomena, load-displacement/strain curves and compressive behavior of the stubs were investigated. The results show that the circular aluminum alloy thin-walled tube-confined concrete (ATCC) experienced shear failure. In the square stubs, due to stress concentration at the corners, the aluminum alloy tubes exhibited tearing at the corners. When the thickness of aluminum alloy thin-walled tube was increased from 2.5 mm to 3.5 mm, the ductility of square and circular stubs was improved by a maximum of 60.2 % and 106.5 %, respectively, and the corresponding axial stiffness was enhanced by a maximum of 21.4 % and 13.2 %, respectively. A parametric analysis is conducted by using a validated finite-element model. The numerical results indicate that when the concrete strength is increased from 40 to 80 MPa, the ultimate bearing capacity and axial compression stiffness of square (circular) stubs increased by 73.9 % (46.7 %) and 58.1 % (54.1 %), respectively. As the slenderness ratio of the square (circular) stubs increased from 10.39 (12.00) to 41.57 (48.00), the corresponding axial stiffness decreased by 73.9 % (46.7 %). The analysis for the confinement mechanism of aluminum alloy tubes on the concrete indicates the circular aluminum alloy tube provide better confinement than the square tubes. Finally, a uniaxial compressive constitutive model for the ATCC is proposed and validated. Based on the proposed design method for ATCC, a full-range prediction analysis of the mechanical behavior of ATCC stubs is conducted. The results show that for the circular stubs, larger strength of external aluminum alloy results in stronger confinement effect to core concrete. For the square stubs, the confinement effect of square aluminum alloy thin-walled tube on concrete is strongest when the strength of concrete and aluminum alloy tube is 40 MPa and 360 MPa respectively. As the <em>D</em>/<em>t</em> or <em>B</em>/<em>t</em> decreases, the confinement effect of the aluminum alloy tube on the concrete is enhanced.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140350"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficiency of a recycled composite material for building insulation","authors":"Nahed Soussi,&nbsp;Marwa Ammar,&nbsp;Ameni Mokni,&nbsp;Hatem Mhiri","doi":"10.1016/j.conbuildmat.2025.140358","DOIUrl":"10.1016/j.conbuildmat.2025.140358","url":null,"abstract":"<div><div>Building sustainability supports the circular economy and contributes to energy saving in the building sector and has gained a large interest worldwide. This can be done by using natural waste to produce new construction materials. In this context, this paper first studies experimentally the influence of adding wood waste (powder form, PB) on the thermophysical and mechanical properties of plasterboards and secondly assesses numerically the thermal efficiency of the produced samples. Plasterboards were made with added wood waste at 5 %, 10 % 20 and 30 % in mass. The results show that adding wood powder as aggregate in gypsum boards decreases the density, the thermal conductivity and water uptake of samples. It is also observed that the flexural and compressive strengths of the prepared composite material remain above the minimum values indicated in the regulations. Numerical analysis of the energy consumption through simulation showed the amount of wood powder and the location of the plasterboards in the building envelope have a significant impact on the effectiveness of the new composite plasterboards. The total energy savings of 29.34 kWh/m² (3.33 kWh/m² for cooling and 26.1 kWh/m² for heating) were achieved with the optimum configuration where plasterboards with 30 % PB are placed on the inner side of exterior walls and in the roof with 30 cm of air gap.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140358"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing material recovery of renovation waste in Shanghai, a life cycle perspective","authors":"Ganping Huang ,&nbsp;Zhuo Zhang ,&nbsp;Huizhi Ding ,&nbsp;Sen Zhang ,&nbsp;Dingyi Li ,&nbsp;Bitian Fu ,&nbsp;Bingsi Wu ,&nbsp;Fuzheng Shan ,&nbsp;Mengqi Xu ,&nbsp;Jun Zhao ,&nbsp;Guangren Qian","doi":"10.1016/j.conbuildmat.2025.140369","DOIUrl":"10.1016/j.conbuildmat.2025.140369","url":null,"abstract":"<div><div>In developing countries, large amounts of renovation waste are generated annually; however, its collection, transportation, disposal, and recovery have long been ignored. China has recently initiated many material recovery projects for renovation waste, and it is necessary to conduct an integrated environmental and economic assessment to select disposal facilities. A life cycle assessment of five potential scenarios was established to conduct a techno-economic evaluation in Shanghai, China. The results indicated that global warming potential, land use, and fine particulate matter formation considerably contributed to the related endpoint environmental impacts. In addition, the external cost of terrestrial ecotoxicity was the highest of all midpoint environmental impacts. As a result, techno-economic evaluation showed that waste-to-energy + production of recycled aggregates and bricks + landfill is the best available technique among the scenarios, which could be used as a sustainable method for renovation waste recovery in Shanghai. This study is expected to provide a reference for the sustainable management of renovation waste in developing countries.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140369"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of PTMEG/MDI-based solid-solid phase change materials for asphalt pavements deicing","authors":"Wenxiu Jiao ,&nbsp;Jiaxing Zhang ,&nbsp;Zhiyong Zhang ,&nbsp;Aimin Sha ,&nbsp;Meng Jia","doi":"10.1016/j.conbuildmat.2025.140301","DOIUrl":"10.1016/j.conbuildmat.2025.140301","url":null,"abstract":"<div><div>Adding phase change materials (PCMs) to asphalt pavements can effectively reduce temperature sensitivity and delay snow and ice accumulation. This study aims to develop solid-solid phase change materials (SSPCMs) for asphalt pavements, with a focus on winter road de-icing. First, the suitability of polyethylene glycol (PEG) and polytetramethylene ether glycol (PTMEG) with varying molecular weights as soft segments was systematically evaluated based on phase change performance, thermal stability, phase change cycling stability, and specific heat capacity. SSPCMs were synthesized using a two-step solution polymerization method, with successful synthesis confirmed by FTIR analysis. The influence of different soft-to-hard segment ratios on phase change performance was also examined. PTMEG2000 exhibited excellent performance, with an exothermic phase change temperature range from 8.5°C to -1.2°C and an enthalpy of 94.3 J/g. Its thermal decomposition onset temperature was 266.05°C, and its performance remained stable after 20 thermal cycles. The incorporation of hard segments led to a reduction in both phase change enthalpy and the initial phase change temperature. At a molar ratio of 4,4′-diphenylmethane diisocyanate (MDI) to PTMEG2000 of 2.4:1, the phase change temperature range was 4.1°C to -5.1°C, with an enthalpy of 37.1 J/g, demonstrating great potential as a de-icing material for roads in cold climates.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140301"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of saline contents on tensile behavior and fiber-matrix interaction in seawater sea-sand engineered cementitious composite (SS-ECC)","authors":"Xiumei Gao ,&nbsp;Weiwen Li ,&nbsp;Linyuwen Ke ,&nbsp;Peng Wang ,&nbsp;Jiaying Wei ,&nbsp;Ying Zhong ,&nbsp;Haoliang Wu ,&nbsp;Yingwu Zhou","doi":"10.1016/j.conbuildmat.2025.140306","DOIUrl":"10.1016/j.conbuildmat.2025.140306","url":null,"abstract":"<div><div>Seawater sea-sand engineered cementitious composite (SS-ECC) demonstrates effectiveness in crack control and resource utilization, enabling it as a promising construction material for marine infrastructure. However, the variable tensile performance of SS-ECC with different mix designs imposes a great challenge to practical implementation. To address this issue, a comprehensive investigation is conducted in this study to bridge the gap between macroscopic tensile properties and microscopic fiber-cement interactions in SS-ECC. Firstly, both normal- and high-strength ECC are fabricated incorporating polyvinyl alcohol (PVA) and polyethylene (PE) fibers. Subsequently, the intrinsic stress-strain characteristics and crack patterns are scrutinized through uniaxial tensile testing of dogbone specimens. Additionally, bond strength and fracture energy at the fiber-cement interface are assessed via pullout tests. Furthermore, heat release is quantified to delineate the cement hydration process, together with X-ray diffraction (XRD) analysis identifying cement hydration products and scanning electron microscopy (SEM) capturing surface micromorphology of tested fibers. Research findings reveal that saline contents from seawater and sea sand lead to a 1.25 % (0 %) and 10.26 % (21.21 %) decrease in ultimate stress and strain for high (normal)-strength ECC, respectively. This reduction is attributed to enhanced bond strength (by 24.9 %) and fracture energy (by 79.4 %) at the fiber-cement interface, along with accelerated cement hydration influenced by the presence of saline contents. These results establish connections between the tensile properties of SS-ECC and its microstructural attributes, offering engineers profound insights into load transfer mechanisms within SS-ECC and enhancing its applicability in marine construction projects.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140306"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D mesomechanical study on the stress failure mechanism of concrete - Taking uniaxial compression as an example","authors":"Weifeng Liu ,&nbsp;Hongfa Yu ,&nbsp;Haiyan Ma ,&nbsp;Jianbo Guo ,&nbsp;Qiquan Mei ,&nbsp;Ying Wang ,&nbsp;Jinhua Zhang ,&nbsp;Fang Wang ,&nbsp;Juan Guo","doi":"10.1016/j.conbuildmat.2025.140381","DOIUrl":"10.1016/j.conbuildmat.2025.140381","url":null,"abstract":"<div><div>The Basic magnesium sulfate cement concrete (BMSCC) exhibits superior performance advantages over Ordinary portland cement concrete (OPC). This study investigates the quasi-static mechanical properties and mesoscopic damage mechanisms of BMSCC40 and OPC40 through a combination of experimental testing and mesoscopic simulation. The results show that BMSCC possesses higher strength and toughness: its uniaxial compressive strength and peak secant modulus increase by approximately 21 % and 14.4 % compared to OPC. The toughness indices <em>I</em>_<em>5</em> and <em>I</em>_<em>10</em> are enhanced by 9.4 % and 6.16 %. Additionally, the elastic stage in the ascending segment of the normalized stress-strain curve is longer, and the descending segment is more gradual for BMSCC. Mesoscopic analysis of the damage mechanisms using a three-dimensional random aggregate model reveals that cracks in OPC exhibit significant branching, forming secondary cracks and a spatial crack network. When encountering aggregates, the cracks primarily bypass them. In contrast, cracks in BMSCC tend to propagate independently, penetrating through the aggregates and resulting in a smaller overall lateral strain of the specimen.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140381"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing steel fiber content and holding time for enhanced mechanical properties of UHPC prepared via prepressure technology","authors":"Yongze Li ,&nbsp;Chunxiao Zhang ,&nbsp;Jize Mao ,&nbsp;Jingbiao Liu ,&nbsp;Junlei Wang ,&nbsp;Shaohua Cao ,&nbsp;Xingwei Cao","doi":"10.1016/j.conbuildmat.2025.140099","DOIUrl":"10.1016/j.conbuildmat.2025.140099","url":null,"abstract":"<div><div>The mechanical properties of concrete are the key indicators for determining the bearing capacity, stability, safety and durability of a structure. The excellent mechanical properties of concrete under strong dynamic loading can reduce or even eliminate damage to the structure. Prepressure technology is more effective in enhancing the compressive strength of concrete. Therefore, this paper uses the prepressure method to design corresponding molds and prepressure processes for samples of different geometric sizes. By setting different steel fiber volume fractions, preloading gradients and continuous preloading times, the axial compressive strength, elastic modulus and compressive strength of cylindrical and cubic samples were tested, and the influences of preloading and holding time on the mechanical properties and the ratio between the compressive strengths of cylindrical and cubic samples were obtained. The results show that the compressive strength at 9 MPa is 50.6 % (SF0), 112.0 % (SF2) and 127.0 % (SF4) greater than that at 0 MPa, and the highest cube compressive strength is 281.1 MPa. The strength growth, mechanical property changes and apparent damage mode of ultra-high performance concrete (UHPC) were revealed via microcomputed tomography(micro-CT), mercury intrusion tests (MIPs) and scanning electron microscopy (SEM). X-ray diffraction (XRD) was used to synchronize the hydration process of the UHPC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"467 ","pages":"Article 140099"},"PeriodicalIF":7.4,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}