Construction and Building Materials最新文献

{"title":"Shear strength of cemented sand in unconfined compression and direct shear tests","authors":"Sung-Sik Park,&nbsp;Seung-Wook Woo,&nbsp;Nhut-Nhut Nguyen","doi":"10.1016/j.conbuildmat.2025.142187","DOIUrl":"10.1016/j.conbuildmat.2025.142187","url":null,"abstract":"<div><div>Cemented sand, composed of sand and cement, is widely used in geotechnical engineering due to its high strength and stability. While the triaxial compression test (TCT) is a standard method for evaluating shear strength, it can be time-consuming and costly. This study proposes a simplified and cost-effective approach by integrating unconfined compression testing (UCT) with camera vision technology to estimate both compressive and shear strength parameters. Cemented sand samples with 10% cement content were tested using UCT and direct shear tests (DST). A novel camera-based technique was used to measure the failure plane angle in UCT, enabling the estimation of internal friction angle and cohesion. The results show that compressive strength and stiffness are highly sensitive to the void ratio, while internal friction angle remains relatively stable. Cohesion values obtained from UCT closely match those from TCT, confirming the reliability of the proposed method. The integration of camera vision with UCT allows for a more efficient and comprehensive evaluation of material behavior. The method has been validated through comparisons with TCT, DST, and previous studies, demonstrating its accuracy, repeatability, and practical applicability. It holds strong potential for broader use in testing various geomaterials such as soil, cemented sand, and concrete.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142187"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279983","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 volumetric-deviatoric split constitutive model for the discrete-particle simulation of concrete","authors":"Mohammad Karimi Mehrabadi,&nbsp;Sharif Shahbeyk,&nbsp;Mohammad Hassan Nazari","doi":"10.1016/j.conbuildmat.2025.142209","DOIUrl":"10.1016/j.conbuildmat.2025.142209","url":null,"abstract":"<div><div>Discrete particle modeling (DPM) is a highly effective method for simulating concrete at the mesoscale. Each DPM model comprises three main components: (1) the method used for spatial tessellation of the sample into rigid particles or cells, (2) the framework for calculating interactions between particles in the elastic range, and (3) the development of constitutive models to describe behavior in the inelastic range. This study presents a new DPM model for the mesoscale modeling of concrete, with particular emphasis on all three key components. The spatial tessellation in the proposed model facilitates the formation of mixed fracture paths, accounting for both the mortar and the interfacial transition zone (ITZ). The elastic relationships are developed to accurately capture the effects of concrete's heterogeneous microstructure on the stress and strain fields. This capability has been validated by comparing the model’s results with those from a finite element meso-model. A new inelastic constitutive model is proposed, which decomposes the material’s behavior into deviatoric and volumetric components, based on the physics of fracture and failure within the concrete microstructure. Additionally, helpful guidelines and suggestions are provided for the initial estimation of each model variable. To validate the model's performance in the inelastic range, uniaxial compression, tensile splitting, and three-point bending samples are fabricated and tested. Comparison of the experimental results with the model’s predictions demonstrates that the model effectively captures failure mechanisms and accurately predicts stress-strain responses under various loading conditions.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142209"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279986","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":"Macroscopic properties and air pores of tailings concrete under dry-wet cycles of chloride attack based on principal component analysis (PCA)","authors":"Yi Li ,&nbsp;Xin Bian ,&nbsp;Junlei Sheng ,&nbsp;Sujuan Yang","doi":"10.1016/j.conbuildmat.2025.142233","DOIUrl":"10.1016/j.conbuildmat.2025.142233","url":null,"abstract":"<div><div>To explore the relationship between air pores and macroscopic properties, normal concrete (NC), iron ore tailings concrete (TC), and steel fiber-reinforced tailings concrete (SFTC) were selected as research objects. Performance tests were conducted after 30, 60, 90, 120, 150, and 180 days of chloride dry-wet cycles, including measurements of compressive strength, chloride permeability, and air pores. ImageJ was used to process images and extract characteristic parameters of the air pores. The fractal dimension of pore axes was calculated, and principal component analysis (PCA) was performed. Results show that the shape parameters have the greatest impact on the mechanical properties for NC and the quantity parameter for TC and SFTC. And the distribution parameters have the greatest impact on the permeability for NC and TC and the quantity parameter for SFTC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142233"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280083","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":"Investigation on the physical, mechanical, and durability properties of ductile aerogel powder cement-based composites","authors":"Xuanteng Lu ,&nbsp;Yonggang Ding ,&nbsp;Qikeng Xu ,&nbsp;Shilong Zheng ,&nbsp;Wenhao Zhao ,&nbsp;Guiling Wang","doi":"10.1016/j.conbuildmat.2025.142278","DOIUrl":"10.1016/j.conbuildmat.2025.142278","url":null,"abstract":"<div><div>This study incorporated aerogel powder into cement-based composites to fabricate a ductile aerogel-powder–cement composite (DACC) with combined ductility and thermal insulation properties. Porosity characterization, thermal conductivity, compressive strength, flexural strength, and tensile strength tests were performed, followed by freeze–thaw cycling and Na₂SO₄ immersion evaluations. Results indicate that as aerogel powder content increased from 0 % to 10 %, DACC density decreased from 1.767 to 1.245 g/cm³ . At 2 %, 4 %, and 6 % aerogel content, compressive strength exceeded 20 MPa while maintaining good ductility and insulation performance. With 10 % aerogel, compressive strength dropped to 7.2 MPa and thermal conductivity reached as low as 0.269 W/(m·K). After 90 freeze–thaw cycles, DACC-10 % exhibited a mass loss of 1.76 % and an 89.2 % reduction in compressive strength. Under sulfate erosion, increasing aerogel content from 2 % to 10 % led to a 2 %–11.6 % improvement in compressive strength. Scanning electron microscopy (SEM) revealed three mechanisms of aerogel powder within the matrix—fiber–mortar–aerogel (FMA), pore–aerogel (PA), and mortar–aerogel (MA)—clarifying their respective influences on DACC performance. This research provides an effective approach for the engineering application of aerogel-powder cement-based composites.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142278"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279981","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":"Change of crack widths and anatomy of cracks within the cover of reinforced concrete tension members","authors":"Dorian Borosnyoi-Crawley","doi":"10.1016/j.conbuildmat.2025.142192","DOIUrl":"10.1016/j.conbuildmat.2025.142192","url":null,"abstract":"<div><div>The literature hypothesizes the existence of a softening zone due to the formation of internal cracks in concrete around embedded reinforcing bars in tension, however, the magnitude of the effect of this softening on the width of primary structural cracks along the concrete cover is still unknown. This paper analyses experimental observations made on reinforced concrete ties, in which the primary structural cracks have been conserved in loaded condition with epoxy injection. It is experimentally demonstrated that a transition point marks the extent of the zone of concrete softening in the change of the crack width along the concrete cover. The location of the transition point and the crack width at the transition point shows a correlation with the thickness of the concrete cover. A simplified engineering model is proposed in a bilinear form for the crack width development along the concrete cover that is demonstrated to provide good prediction for the crack widths. A detailed assessment completes the analysis with identifying multiple crack geometry parameters in the general anatomy and constrictedness of structural cracks for the development of physical models in the future for crack tortuosity in concrete.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142192"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279984","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":"Detection method of shallow freeze-thaw damage in asphalt mixture based on infrared pulse thermography","authors":"Chao Xing,&nbsp;Guiping Zheng,&nbsp;Chaoyu Ji,&nbsp;Lei Zhang,&nbsp;Huining Xu,&nbsp;Yiqiu Tan","doi":"10.1016/j.conbuildmat.2025.142240","DOIUrl":"10.1016/j.conbuildmat.2025.142240","url":null,"abstract":"<div><div>Freeze-thaw damage to the asphalt mixture is considered to be one of the primary underlying causes of pavement defects. Nevertheless, the current lack of appropriate evaluation equipment and methodologies impedes the accurate assessment of the degree of freeze-thaw damage in real time, directly affecting the formulation of pavement maintenance decisions. Infrared thermography technology facilitates the detection of superficial freeze-thaw damage in asphalt pavements. In this paper, a detection system of shallow freeze-thaw damage in asphalt mixtures based on infrared pulse thermography is established. Infrared characteristic parameters are extracted from the aspect of temperature gradients. Temperature contours, local temperature gradients (LTG), and comprehensive temperature gradients (CTG) are utilized to analyze the temperature field distribution of asphalt mixtures. A detection method for the freeze-thaw damage point of asphalt mixtures is proposed, and the correlation between infrared characteristic parameters and the mechanical properties of the specimens is analyzed. Based on the infrared phase-locked thermography system, the effectiveness and applicability of the detection method are verified, with the comprehensive phase gradient (CPG) serving as the characteristic index. The results indicate that CTG can better reflect the surface temperature difference area of the single-sided freeze-thaw specimen. The CTG of the specimen in the normal state is relatively minor and concentrated below 0.3. The correlation characteristics between the CTG characteristic parameters and the freeze-thaw splitting strength ratio (<em>TSR</em>)were analyzed. The critical values of the proportions of high gradient areas <em>u</em>_0.2 and <em>u</em>_0.3 are 0.19 and 0.04 respectively. When the critical values are exceeded, it can be concluded that the asphalt mixture has damage as a result of freeze-thaw. The correlation coefficient between the parameters of the CTG and the CPG is above 0.85, indicating a strong correlation between both variables. The detection method proposed in this article provides a new idea for realizing in-situ non-destructive shallow damage detection of pavements and also provides a foundation for transportation infrastructure construction and road maintenance decisions based on infrared thermography.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142240"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279985","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":"Experimental evaluation of the transfer and development length of 28.6 mm diameter grade 1780 strands in normal strength concrete","authors":"Fray F. Pozo-Lora ,&nbsp;Marc Maguire ,&nbsp;Andrew D. Sorensen ,&nbsp;Marvin W. Halling ,&nbsp;Paul J. Barr","doi":"10.1016/j.conbuildmat.2025.142243","DOIUrl":"10.1016/j.conbuildmat.2025.142243","url":null,"abstract":"<div><div>This research experimentally addresses the determination of the required transfer and development length of beams reinforced with 19-wire 28.6 mm diameter, grade 1780, prestressing steel strands, which contain 5.4 times more area than typical 13 mm diameter strands. Eight (8) full-scale beam specimens were constructed to evaluate the influence of different concrete compressive strengths on transfer and development length of these large-diameter strands with the overarching goal of determining whether they could be used in precast concrete applications. Demountable Mechanical (DEMEC) gauges were used to gather surface strain readings, which were further analyzed using the 95 % of the Average Maximum Strain (AMS) method to obtain the transfer lengths. Development length testing was performed by loading the beams until failure at locations between the theoretical development length and the experimental transfer length to obtain the experimental development length values. The tests conducted in this research suggest that beams reinforced with these strands would have transfer lengths between 22 and 52 strand diameters, and development lengths would likely be in the range of 60–120 strand diameters for concrete strengths between 45 and 65 MPa.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142243"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279860","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":"Comparative studies on mechanical properties of novel lean duplex stainless steel S32001","authors":"Xin Yu ,&nbsp;Bo-Yan Zhu ,&nbsp;Yidu Bu ,&nbsp;Xiang-Yong Xiao ,&nbsp;Wei Liu","doi":"10.1016/j.conbuildmat.2025.142065","DOIUrl":"10.1016/j.conbuildmat.2025.142065","url":null,"abstract":"<div><div>The recent successful mass production of S32001 has led to numerous engineering applications; however, there are limited studies specific to this grade. This study investigates its mechanical performance compared to traditional duplex stainless steel S32205 and carbon steel Q355, with special focus on anisotropy, cold-forming hardening, and welding characteristics. Experimental results show that S32001 has a dual-phase microstructure with balanced austenite and ferrite, offering competitive strength and improved plasticity over S32205. It exhibits anisotropic yield strength, a pronounced cold-forming effect enhancing strength but reducing ductility, and comparable welding performance to S32205, with a distinct heat-affected zone. Modifications to existing constitutive models were made to improve the prediction of stress-strain behaviour in both flat and cold-formed regions. Lastly, a life cycle cost (LCC) study confirms S32001’s cost-effectiveness in less corrosive environments.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142065"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279982","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":"An efficient PEI based carbon absorption coating for asphalt pavement","authors":"Bochao Zhou,&nbsp;Hailong Li,&nbsp;Yang Zhang,&nbsp;Yulei Liang,&nbsp;Chao Wang","doi":"10.1016/j.conbuildmat.2025.142115","DOIUrl":"10.1016/j.conbuildmat.2025.142115","url":null,"abstract":"<div><div>This study explores the development and performance of a polyethylenimine (PEI)-based coating for carbon dioxide (CO₂) absorption in asphalt pavements. To address the urgent need for carbon mitigation in transportation infrastructure, this coating integrates PEI of amine-rich adsorption capacity, silica nanoparticles (SiO₂) using for structural reinforcement, and activated carbon (AC) using for enhancing gas diffusion. The absorption mechanism is investigated in depth, with a focus on optimizing the mixture ratio to maximize CO₂ absorption. The results reveal that the optimal ratio of PEI:SiO₂:AC (3:1:1) achieves a CO₂ absorption efficiency of 30.5 %. In addition, microstructure characterization was performed using FT-IR and SEM，the result show that incorporation of AC significantly improves the absorption performance due to its porous structure, which increases surface area and CO₂ interaction. In addition, the coating exhibits excellent road performance, including pencil hardness of 2 H, excellent water repellency, enhanced skid resistance when quartz sand is added. These properties ensure its practical applicability. Its effective absorption capacity, structural integrity, and durability highlight its potential as an innovative solution for reducing the environmental footprint of asphalt pavements.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142115"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279987","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":"Enhancing mechanical properties of high-strength recycled concrete with basalt fiber and nano-calcium carbonate: Experimental and numerical investigations","authors":"Chao Chang ,&nbsp;Hao Ning ,&nbsp;Min Song ,&nbsp;Yan Ma ,&nbsp;Xin Wang ,&nbsp;Bun Theavuth Ketekun ,&nbsp;Khaja Wahaajuddin Kawkabi ,&nbsp;Xu Long","doi":"10.1016/j.conbuildmat.2025.142264","DOIUrl":"10.1016/j.conbuildmat.2025.142264","url":null,"abstract":"<div><div>In structural engineering applications, the use of recycled aggregate (RA) is often limited due to its relatively low mechanical properties, particularly in high-performance environments where its suitability is critical. This limitation has driven the need for improvements to ensure RA can be used effectively in high-strength concrete applications. In order to make it more suitable for demanding engineering applications while promoting sustainability by utilizing recycled materials, this study investigates the modification effects and modification mechanisms of basalt fiber (BF) and nano-calcium carbonate (NC) on the static mechanical properties of high-strength recycled concrete (HSRC). Through static uniaxial compression experiments, the macroscopic effects of different dosages of BF and NC on the stress-strain curve, failure mode and mechanism, elastic modulus, and compressive strength of HSRC were systematically analyzed. Scanning electron microscopy was used to investigate the microstructure and reveal the microscopic enhancement mechanism of BF and NC in the interface transition zone and matrix. Additionally, a constitutive model of modified high-strength recycled concrete (MHSRC) was developed, which quantified the effects of three material dosages of RA, BF, and NC on the material stress-strain relationship. The fitting results show that it has good applicability. Moreover, mesoscopic model of MHSRC was established. By comparing the numerical simulation results with the experimental results, the reliability of the model in predicting the macroscopic mechanical properties of MHSRC and the accuracy of the constitutive model in estimating its stress-strain relationship were verified. The results show that the synergistic effect of BF and NC significantly improves the mechanical properties of HSRC, and the best combination is 0.5 % BF and 2.5 % NC, which increases the compressive strength by 6.4 % compared with the unmodified HSRC. Microscopic analysis shows that the interaction between BF and NC improves the interface transition zone between RA and matrix, as well as between BF and matrix. The two produce a synergistic mechanism at appropriate dosages, which is manifested explicitly as a comprehensive improvement in strength and ductility. This finding provides important insights into understanding fiber-nanomaterials to improve the mechanical properties of HSRC and its structural engineering applications and contributing to the development of more sustainable, high-performance concrete for structural applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142264"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279988","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}