Construction and Building Materials最新文献_第3页

The potential application of ultrasonic testing in the in-situ assessment of Dou components in Chinese timber heritage conservation 超声检测在中国木材遗产保护中原位鉴定Dou组分的潜在应用

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143880

Panpan Liu , Sok Yee Yeo , Hiroatsu Fukuda

{"title":"The potential application of ultrasonic testing in the in-situ assessment of Dou components in Chinese timber heritage conservation","authors":"Panpan Liu , Sok Yee Yeo , Hiroatsu Fukuda","doi":"10.1016/j.conbuildmat.2025.143880","DOIUrl":"10.1016/j.conbuildmat.2025.143880","url":null,"abstract":"<div><div>In ancient Chinese timber architecture, the <em>Dou</em> component plays a critical role in vertical load transfer and structural stability. Given its complex geometry and historical value, non-destructive and in-situ evaluation methods are essential for assessing its mechanical integrity. This study investigates the feasibility of using ultrasonic wave velocity to predict the vertical load-bearing capacity of full-scale <em>Dou</em> components made of Douglas fir and Mongolian Scots Pine. A total of 200 specimens were tested under cruciform-shaped and linear-shaped compression. Ultrasonic wave velocities were measured along both the longitudinal and transverse directions, and their correlations with stiffness (<em>k</em>) and proportional limit load (<em>F</em>) were analyzed using Spearman rank correlation. The results reveal that longitudinal ultrasonic wave velocity (<span><math><msub><mrow><mi>υ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span>) offers higher measurement stability and stronger predictive potential for stiffness, particularly in Douglas fir specimens. In contrast, transverse ultrasonic wave velocity (<span><math><msub><mrow><mi>υ</mi></mrow><mrow><mi>W</mi></mrow></msub></math></span>) showed weaker and less consistent correlations with mechanical parameters across both wood species. The findings highlight the influence of measurement direction, wood species, and compression shapes on predictive performance and provide a technical foundation for developing non-destructive evaluation strategies for traditional timber structures. However, due to sample size limitations, future research is needed to refine the statistical models and assess the performance of aged <em>Dou</em> components.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143880"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204359","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}

引用次数: 0

Sustainable brick production using waste foundry sand and cast-iron slag: Reductions in embodied energy, CO₂ emissions, and cost 利用废铸造砂和铸铁渣可持续生产砖：减少隐含能源、二氧化碳排放和成本

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143889

Nilay Kucukdogan

{"title":"Sustainable brick production using waste foundry sand and cast-iron slag: Reductions in embodied energy, CO₂ emissions, and cost","authors":"Nilay Kucukdogan","doi":"10.1016/j.conbuildmat.2025.143889","DOIUrl":"10.1016/j.conbuildmat.2025.143889","url":null,"abstract":"<div><div>Waste foundry sand (WFS) and cast-iron slag (CIS) are industrial wastes that are generated in large quantities during the production of cast iron worldwide, and for which various solutions are sought for their disposal. In this study, these two wastes were used together for the first time in the production of fired bricks to provide clay substitution, as well as to reduce embodied energy, CO<sub>2</sub> emissions, and costs. Modified bricks were produced with varying proportions of WFS and CIS (both up to 20 %) and fired at 850 °C, 950 °C, and 1050 °C. The physical, mechanical, and microstructural properties of the bricks were evaluated, along with an assessment of their embodied energy and CO<sub>2</sub> emissions. Results showed that bricks fired at 1050 °C met the standards for high-strength load-bearing applications, with water absorption values within acceptable limits. Using 20 % CIS and 10 % WFS resulted in lower water absorption compared to reference bricks, while dual-component mixtures (5 % CIS + 10 % WFS) exhibited superior mechanical performance. Microstructural analysis confirmed that the additives enhanced the densification of the brick matrix. Notably, incorporating WFS and CIS reduced embodied energy by 15.22 % and CO<sub>2</sub> emissions by 15.87 %, with bricks containing 20 % WFS being 2.11–2.23 % cheaper to produce. Energy costs were identified as the primary expense, with the energy required to reach firing temperature having a greater impact than the firing process itself. The study concludes that WFS and CIS are effective additives for sustainable brick production, offering significant environmental and economic benefits.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143889"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204360","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}

引用次数: 0

Dynamic flexural performance and failure mechanisms of AR-glass TRM under coupled elevated temperature and low-velocity impact ar玻璃TRM在高温低速耦合冲击下的动态弯曲性能及破坏机理

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143824

Anling Li , Yongbo Shao , Dorin Radu , Marijana Hadzima-Nyarko , Deju Zhu

{"title":"Dynamic flexural performance and failure mechanisms of AR-glass TRM under coupled elevated temperature and low-velocity impact","authors":"Anling Li , Yongbo Shao , Dorin Radu , Marijana Hadzima-Nyarko , Deju Zhu","doi":"10.1016/j.conbuildmat.2025.143824","DOIUrl":"10.1016/j.conbuildmat.2025.143824","url":null,"abstract":"<div><div>This study investigates the dynamic flexural behavior and failure mechanisms of alkali-resistant (AR) glass textile-reinforced mortar (TRM) under the combined influence of elevated temperature and low-velocity impact loading. Specimens were exposed to target temperatures (100℃, 200℃, 300℃, and 400℃) and subsequently tested under three-point impact bending at varying velocities. Results reveal that moderate heating (≤200℃) may retain or slightly enhance flexural ductility due to matrix densification and coating softening. However, the critical transition spanning 200–300℃ was marked by a sharp decline in ultimate stress and toughness, concomitant with a failure-mode shift from fiber pull-out to fiber rupture. Importantly, degradation was more severe under real-time high-temperature impact compared to post-heating tests, due to the absence of bond recovery and accelerated interfacial weakening. Quantitative analysis confirmed strong negative correlations between mean crack spacing and both ultimate stress and toughness, highlighting the role of crack morphology in energy dissipation. This mechanism explains the brittle transition of TRM under fire–impact coupling and informs resilient composite design.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143824"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204363","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}

引用次数: 0

Assessing the environmental risk and toxicity of cementitious composites incorporating coal bottom ash: A hierarchical analysis framework 评估含煤底灰胶凝复合材料的环境风险和毒性：一个层次分析框架

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143816

Ervin Shan Khai Tiu , Shi Hong Wong , Sudharshan N. Raman , Daniel Kong , Massoud Sofi , Guoqing Geng

{"title":"Assessing the environmental risk and toxicity of cementitious composites incorporating coal bottom ash: A hierarchical analysis framework","authors":"Ervin Shan Khai Tiu , Shi Hong Wong , Sudharshan N. Raman , Daniel Kong , Massoud Sofi , Guoqing Geng","doi":"10.1016/j.conbuildmat.2025.143816","DOIUrl":"10.1016/j.conbuildmat.2025.143816","url":null,"abstract":"<div><div>Sustainable practices increasingly explore the valorization of industrial by-products, while addressing potential toxicity implications associated with the practice. Coal bottom ash (CBA), a coal combustion by-product, is gaining attention for use in cementitious composites, though concerns remain regarding its long-term environmental safety. This study presents a hierarchical toxicity analysis using the Toxicity Characteristics Leaching Procedure (TCLP) to assess the leaching behavior across raw CBA, coal fly ash (CFA), optimized ground CBA, and two cementitious paste variations incorporating optimized ground CBA. Physico-chemical characterization was conducted through ICP-MS, quantifying eleven trace elements (As, Ba, Cd, Co, Cr, Mn, Ni, Pb, Se, V, Zn). In comparison, CFA exhibited higher leaching of non-compliant elements (As, Cr, Mn, Se) compared to CBA (exceeding limits only for Mn). While grinding increased Mn and Ni leachability in optimized ground CBA, their integration into cementitious binder systems significantly reduced overall trace element concentrations. Minor Ba leaching was observed. These findings demonstrate that optimized ground CBA is viable for incorporation into cementitious pastes, as evidenced by the consistently low trace element concentrations in the leachates. Overall leachability across all assessed trace elements remained minimal, with a maximum of only 1.13 %, highlighting the environmental safety of the investigated material. These outcomes support the potential transformation of CBA from waste into a viable resource, aligning with sustainable practices and public health considerations. This study provides critical insights to guide more informed scientific decision-making among stakeholders in the cement and concrete sectors, as well as policymakers, particularly in sustainable waste management and resource recovery.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143816"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204364","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}

引用次数: 0

Mitigating heavy metal leaching and ASR expansion in copper heap leach residue concrete using cement and cement-fly ash-silica fume blends: Experimental and microstructural insights 使用水泥和水泥-粉煤灰-硅灰混合物减轻铜堆浸出渣混凝土中的重金属浸出和ASR膨胀：实验和微观结构的见解

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143859

Sanjida Khair, SM Arifur Rahman, Faiz Uddin Ahmed Shaikh, Prabir Kumar Sarker

{"title":"Mitigating heavy metal leaching and ASR expansion in copper heap leach residue concrete using cement and cement-fly ash-silica fume blends: Experimental and microstructural insights","authors":"Sanjida Khair, SM Arifur Rahman, Faiz Uddin Ahmed Shaikh, Prabir Kumar Sarker","doi":"10.1016/j.conbuildmat.2025.143859","DOIUrl":"10.1016/j.conbuildmat.2025.143859","url":null,"abstract":"<div><div>Copper heap leach residue (CHLR) is generated after copper is recovered from low‑grade copper ores. The CHLR leachate indicated a very high concentration of heavy metals above the threshold requirement of US EPA 2009 and Australian drinking water guideline. In this study, 25–75 % CHLR was repurposed as a partial replacement of natural aggregates in concrete, and heavy metal concentrations in the leachate of concrete met the drinking quality standards. However, concrete containing 50 % CHLR coarse and fine aggregates were 52.9 MPa and 54 MPa after six months, indicating 10.5 % and 8.6 % reduction in compressive strength compared to the control with corresponding alkali-silica reaction (ASR) expansion of 0.072 % and 0.094 %, respectively. The cement content of these concrete mixes was replaced with 30 % fly ash and 5 % silica fume, and the compressive strength of 50 % CHLR coarse and fine aggregates was 48.7 MPa and 48.4 MPa after six months, representing 2.4 % and 3 % less compared to control, while the corresponding ASR expansion was reduced to 0.035 % and 0.058 %, respectively. The BSE-EDS and nanoindentation on the interfacial transition zone of the samples containing 50 % CHLR and 35 % pozzolans produced a higher volume of high-density C-S-H to resist the ASR expansion, improved strength development, and lowered embodied carbon and energy of these concretes.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143859"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204362","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}

引用次数: 0

Mechanistic study on the influence of nano‑SiO₂ on the properties of smart cementitious composites to sulfate attack: From experiments to evaluation modeling 纳米sio2对智能胶凝复合材料抗硫酸盐侵蚀性能影响的机理研究：从实验到评价模型

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143874

Ziyi Song , Sherong Zhang , Chao Wang , Xiaohua Wang , Zihan Huang

{"title":"Mechanistic study on the influence of nano‑SiO₂ on the properties of smart cementitious composites to sulfate attack: From experiments to evaluation modeling","authors":"Ziyi Song , Sherong Zhang , Chao Wang , Xiaohua Wang , Zihan Huang","doi":"10.1016/j.conbuildmat.2025.143874","DOIUrl":"10.1016/j.conbuildmat.2025.143874","url":null,"abstract":"<div><div>The potential impact of sulfate attack on the self-sensing performance of smart cementitious composites posed non-negligible risks to the accuracy of structural health monitoring. This study aimed to enhance the sulfate attack resistance of those containing multi-walled carbon nanotubes (MWCNTs) by incorporating nano-SiO₂ (NS). Mechanical, electrical, and cyclic piezoresistive properties were determined under sulfate exposure. Microstructure and phase composition were characterized using MIP, FE-SEM, EDS, XRD, and TG-DTG. A new evaluation model integrated the maximum fractional change in resistivity (FCR<sub><em>max</em></sub>), stress sensitivity (SES), strain sensitivity (SAS), and the stress–FCR vertical offset (SFVO) to yield a self-sensing performance index (SPI). Results showed that 0.5 wt% NS-modified mortar most effectively mitigated self-sensing performance degradation during late-stage erosion. Under varying load amplitudes, the maximum increases in FCR<sub><em>max</em></sub>, SES, and SAS compared to other samples were 4.0, 10.2, and 6.0 times, respectively; under varying loading rates, these indicators increased by 6.9, 14.0, and 9.1 times; moreover, smaller standard deviation (SD) and coefficient of variation (CV) of SFVO indicated lower volatility and enhanced stability of self-sensing performance. The pozzolanic and nucleation effects of NS and MWCNTs reduced porosity by 4.11–15.97 %, inhibited sulfate ion transport, and decreased corrosion products by 10.1 % after 180 days of erosion. SPI increased with load amplitude but decreased with loading rate; high rates, coupled with corrosion products, accelerated self-sensing degradation, reducing the maximum SPI by 2.89–5.41 % versus low rates. These findings provide a foundation for designing durable smart cementitious composites and predicting their long-term performance in sulfate environments.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143874"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218985","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}

引用次数: 0

Hydration behavior and microstructure of low carbon cementitious materials containing calcined kaolin tailings in China 中国煅烧高岭土尾矿低碳胶凝材料的水化行为与微观结构

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143853

Ruochen Jiang , Yu Yan , Yichuan Zhou , Zhangli Hu , Cheng Yu , Jiaping Liu

{"title":"Hydration behavior and microstructure of low carbon cementitious materials containing calcined kaolin tailings in China","authors":"Ruochen Jiang , Yu Yan , Yichuan Zhou , Zhangli Hu , Cheng Yu , Jiaping Liu","doi":"10.1016/j.conbuildmat.2025.143853","DOIUrl":"10.1016/j.conbuildmat.2025.143853","url":null,"abstract":"<div><div>The Limestone Calcined Clay Cement (LC<sup>3</sup>) is a novel cementitious material based on clay materials, which can reduce carbon emission by up to 40 %. Considering the fact that clay is restricted to be directly used as construction materials in China, kaolin tailings, as one of industrial waste, might be a potential resource to make LC<sup>3</sup>. In this study calcined kaolin tailings (CKT) from Guangxi Province were blended with limestone as replacement of cement clinkers. The mechanical performance, hydration behavior, and microstructural evolution were investigated by various characterization methods. The results show that replacement of CKT and limestone enhances the long-term strength development, resulting in a comparable 28-day strength as pure Portland cement. The pozzolanic and synergistic reactions of CKT mainly occur after 3 days. The later formed AFm phases and C-A-S-H can further refine pore structure. When the replacement rate is over 30 %, the dissolved aluminum ions from CKT are more inclined to enter C-A-S-H rather than to form more AFm. At an equivalent gel–space ratio, CKT–limestone blended cements showed higher compressive strength than the reference cement and other blended cement reported in the literature, highlighting the potential of CKT–limestone systems as a low-carbon option for China.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143853"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218986","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}

引用次数: 0

Effects of dry and wet mixing times on the quality of asphalt concrete 干湿搅拌次数对沥青混凝土质量的影响

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143788

Jia-Ruey Chang, Yi-Ting Lo, Yi-Yu Lo

{"title":"Effects of dry and wet mixing times on the quality of asphalt concrete","authors":"Jia-Ruey Chang, Yi-Ting Lo, Yi-Yu Lo","doi":"10.1016/j.conbuildmat.2025.143788","DOIUrl":"10.1016/j.conbuildmat.2025.143788","url":null,"abstract":"<div><div>The quality of asphalt concrete is affected by dry and wet mixing times, which often rely on the operator’s experience. This study was conducted at an asphalt plant to examine batch size (1, 2, 3 tons), dry mixing time (5, 10, 20 s), and wet mixing time (35, 40, 50 s) on dense-graded asphalt concrete with a 19.0 mm nominal maximum aggregate size and 4.8 % asphalt content. For dry-mixed aggregates, visual uniformity assessment, sieve analysis, and regression analysis of gradation degradation were conducted. For wet-mixed mixtures, visual uniformity assessment, sieve analysis of extracted aggregate, and asphalt content measurement were conducted. For Marshall specimens, stability and flow were measured, and asphalt film thickness was analyzed. The results indicated that for dry-mixed aggregates, longer dry mixing time improved aggregate uniformity in small batches but caused gradation degradation. For wet-mixed aggregates, extending the wet mixing time in small batches compensated for shorter dry mixing times, showing that gradation degradation primarily results from the dry mixing phase. Larger batches showed limited impact on gradation with longer wet mixing time. However, in full batches, dry-mix-induced gradation degradation increased fine aggregate content and asphalt content variation. Results from the stability, flow, and asphalt film thickness analyses showed that increasing batch size and wet mixing time improved stability, reduced the range of stability values, and decreased the standard deviation of asphalt film thickness. The study identified the most suitable combinations of operational parameters and recommended the most appropriate production quantity for achieving the best mix quality. Overall, the experimental process presented in this study serves as a reference framework for selecting the appropriate dry and wet mixing times under different mixers, aggregate gradations, or production needs.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143788"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218988","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}

引用次数: 0

Effect of binder-to-sand ratio for dicalcium silicate mortar on its restoration properties for sandstone cultural relics 硅酸盐二钙砂浆胶砂比对砂岩文物修复性能的影响

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143806

Xiaofei Wang , Zhen Huo , Qiao Shi , Hongjie Luo , Zhenbin Xie , Shidong Ji

{"title":"Effect of binder-to-sand ratio for dicalcium silicate mortar on its restoration properties for sandstone cultural relics","authors":"Xiaofei Wang , Zhen Huo , Qiao Shi , Hongjie Luo , Zhenbin Xie , Shidong Ji","doi":"10.1016/j.conbuildmat.2025.143806","DOIUrl":"10.1016/j.conbuildmat.2025.143806","url":null,"abstract":"<div><div>Controlling volumetric stability of the repair material itself, along with its bonding performance to the sandstone cultural relic substrate, are critical aspects for achieving effective restoration. In our previous study, a home-made dicalcium silicate (Ca<sub>2</sub>SiO<sub>4</sub>, C<sub>2</sub>S) clinker exhibited very high hydraulic activity was recommended as a potential candidate conservation material for sandstone cultural relics. Here, the hydration process and related composition of dicalcium silicate pastes were monitored for a long period over one year. By examining the microstructural evolution of the interfacial transition zone with varying binder-to-sand ratios and curing times, the relationship between the intrinsic strength of the repair materials, bonding strength, and the location of fracture surfaces was established. The results indicated that the incorporation of aggregate can effectively addressed the problem of volumetric stability during the curing of neat paste. Furthermore, by varying binder-to-sand ratio the bonding strength and fracture location could be regulated, which was important for avoiding restorative damage risks to cultural relics. It was found that the particles on the sandstone surface could actively promote the hydration process of dicalcium silicate and further lead to increase the strength of the interfacial transition zone overpassing that of the dicalcium silicate paste itself. Even though the incorporation of sand hinders the effective bonding between dicalcium silicate cementitious material and sandstone initially, the subsequently formed hydration products during curing, especially C-S-H gel, could densify the interfacial transition zone and thereby significantly improve bonding strength, which was the reason for explaining the continuously change and migration of the fracture position over time.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143806"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218984","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}

引用次数: 0

Numerical simulation study on fracture behavior of asphalt concrete under temperature segregation effect 温度离析作用下沥青混凝土断裂行为的数值模拟研究

IF 8 1区工程技术

Construction and Building Materials Pub Date : 2025-10-03 DOI: 10.1016/j.conbuildmat.2025.143866

Xu Chen , Dongya Ren , Changfa Ai , Yuan Cao , Chuanqi Yan , Mengying Tang

{"title":"Numerical simulation study on fracture behavior of asphalt concrete under temperature segregation effect","authors":"Xu Chen , Dongya Ren , Changfa Ai , Yuan Cao , Chuanqi Yan , Mengying Tang","doi":"10.1016/j.conbuildmat.2025.143866","DOIUrl":"10.1016/j.conbuildmat.2025.143866","url":null,"abstract":"<div><div>Existing studies on the influence of temperature segregation on the fracture behavior of asphalt pavement in cold regions are mostly based on conventional macroscopic tests, lacking research on the meso-mechanical behavior of internal particles in asphalt concrete. In view of this, this paper, based on the gradation and void ratio of standard Marshall specimens, employs the discrete element numerical simulation method to analyze the influence of temperature segregation on the meso-fracture behavior of asphalt concrete, including interparticle contact forces, displacement, and crack propagation. It is found that temperature segregation alters the mechanical behavior of asphalt concrete by restructuring its meso-spatial configuration. The main conclusions are as follows: temperature segregation reorganizes the spatial structure of meso-particles (aggregates and asphalt mortar) in asphalt concrete, thereby inducing a redistribution of interfacial contact forces among particles. This subsequently leads to coordinated changes in particle displacement and ultimately alters the crack distribution pattern. This cascading mechanical response deteriorates the low-temperature crack resistance of asphalt concrete.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143866"},"PeriodicalIF":8.0,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204358","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}

引用次数: 0