Construction and Building Materials最新文献

{"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}

{"title":"Effects of borides on flame retardant and decay resistance properties of resin modified wood","authors":"Xiaobo Xue,&nbsp;Fei Wang","doi":"10.1016/j.conbuildmat.2025.142279","DOIUrl":"10.1016/j.conbuildmat.2025.142279","url":null,"abstract":"<div><div>This study employed phenol-melamine-urea-formaldehyde (PMUF) resin and borides to impregnate Chinese fir from planted forests, systematically investigating the influence of borides on the flame retardancy and decay resistance performance of PMUF resin modified wood. The results indicate that after incorporating borides, the oxygen index of the composite modified wood increased by 24.2 % compared to the resin modified wood, achieving a V-0 level. Meanwhile, the two peak heat release rates of the composite modified wood decreased by 39.6 % and 32.1 % respectively, and the total heat release and total smoke release decreased by 19.3 % and 43.7 % respectively. Raman spectroscopy analysis showed a higher degree of graphitization in the composite modified wood. Pyrolysis-gas chromatography/mass spectrometry analysis revealed that borides inhibited the generation of volatile phenolic compounds and effectively prevented the ring-opening fracture of pyran rings in cellulose. Decay resistance tests show that resin modified wood achieves a strong decay resistance grade I, while the decay resistance performance of composite modified wood slightly decreases but still reaches the decay resistance grade Ⅱ. Combined with scanning electron microscopy, differential scanning calorimetry, ¹³C solid-state nuclear magnetic resonance, dynamic mechanical and nanoindentation analysis, it was indicated that the addition of borides reduced the crosslinking density of the resin, interfered with the curing process of the resin, and led to a decrease in the cell wall modulus and hardness of the composite modified wood. This research provides a new theoretical basis and technical guidance for the inorganic-organic combined modification of wood.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142279"},"PeriodicalIF":7.4,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280082","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":"Passivation behavior of steel in alkali-activated materials and corrosion behavior under carbonation conditions","authors":"Congcong Ma ,&nbsp;Linwen Yu ,&nbsp;Yuxuan Sun ,&nbsp;Chao Xu ,&nbsp;Mengzhu Chen ,&nbsp;Changhui Yang","doi":"10.1016/j.conbuildmat.2025.142241","DOIUrl":"10.1016/j.conbuildmat.2025.142241","url":null,"abstract":"<div><div>This study investigates the passivation behavior of steel in simulated pore solutions at various hydration stages (early, middle, and late) in alkali-activated materials (AAMs) and the corrosion behavior under simulated carbonation conditions. Portland cement was used as the control group. The research initially focused on studying the passivation behavior of the steel. The results revealed that in the waterglass-activated solution (WGS), a higher Si/Al ratio (&gt;1.5) promoted the formation of an aluminate/silicate adsorption layer on the steel surface, which effectively reduced the negative impact of S^2- on the passive film. In contrast, the NaOH-activated solution (NHS) with a Si/Al ratio lower than 0.5 led to the formation of a loose passive film containing FeS. Both the adsorption layer in WGS and the FeS-containing passive film in NHS showed thicknesses exceeding 30 nm. In the Portland cement solution (PCS), a double-layer passive film with a thickness of less than 10 nm was formed. When subjected to simulated carbonation conditions with reduced pH, the critical pH values for corrosion initiation of the passive film in the WGS and PCS groups were similar, around 8.5. However, the NHS group exhibited a significantly higher critical pH of 12.5. This discrepancy arises because the adsorption layer in WGS and the dense passive film in PCS provided better corrosion resistance, whereas the loose FeS-containing passive film in NHS offered weaker protection.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"489 ","pages":"Article 142241"},"PeriodicalIF":7.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280064","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}