Case Studies in Construction Materials最新文献

{"title":"Effect of freeze-thaw cycles on bending properties and microstructure of slag-fly ash based geopolymer cemented iron tailings sand","authors":"Hongchun Xu ,&nbsp;Hang Yin ,&nbsp;Shasha Lu ,&nbsp;Ge Pei","doi":"10.1016/j.cscm.2025.e04962","DOIUrl":"10.1016/j.cscm.2025.e04962","url":null,"abstract":"<div><div>This study aims to reveal the damage characteristics of slag-fly ash cemented iron tailings sand controlled low-strength material (SFG-T-CLSM) under freeze-thaw cycles, as well as the mechanism of fibers enhancing the durability performance in SFG-T-CLSM. Through three-point bending tests, CT scanning tests, and scanning electron microscopy (SEM) tests, the microstructural changes and macro-mechanical property responses of fiber-reinforced SFG-T-CLSM in freeze-thaw environments were comprehensively analyzed. The research results show that: with the increase in the number of freeze-thaw cycles, the flexural strength of SFG-T-CLSM gradually decreases. After 15 freeze-thaw cycles, the flexural strength loss of the specimen without fiber addition is 43.84 %, while the strength loss decreases to 29.10 % after adding 5 ‰ fibers. Three-dimensional reconstructed CT slices reveal that the number of pores inside the matrix gradually increases. However, the presence of fibers during freeze-thaw cycles effectively alleviates pore development, plays a role in bridging cracks and dispersing stress, improves the pore distribution characteristics inside the CLSM matrix, significantly reduces the number and width of cracks, and remarkably enhances the crack resistance of SFG-T-CLSM. SEM results further confirm that fibers exhibit significant anti-damage effects in SFG-T-CLSM under harsh freeze-thaw cycle environments through their three-dimensional network structure. The debonding mode of fibers gradually evolves with the increase in the number of freeze-thaw cycles: from good bonding in the early stage, to interfacial damage in the middle stage, and then to significant debonding in the later stage. Consequently, the role of fibers in SFG-T-CLSM gradually weakens, and the crack resistance and structural integrity also decline accordingly. This study demonstrates that the introduction of fibers is an effective strategy to enhance the freeze-thaw durability of CLSM, providing a theoretical basis for improving the application of CLSM in extreme environments.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04962"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of carbonization on chloride penetration in rapid repair mortar derived from solid waste-based CSA cement","authors":"Xiangshan Hou ,&nbsp;Jingwei Li ,&nbsp;Chuang Guan ,&nbsp;Xinyan Zhang ,&nbsp;Xujiang Wang ,&nbsp;Yuzhong Li ,&nbsp;Yujie Li ,&nbsp;Wenbin Shi ,&nbsp;Wenlong Wang","doi":"10.1016/j.cscm.2025.e04956","DOIUrl":"10.1016/j.cscm.2025.e04956","url":null,"abstract":"<div><div>The development of highly corrosion-resistant rapid repair mortar (RRM) for marine concrete is of great importance, particularly given the significant role that Cl^- corrosion plays in the deterioration of marine construction materials. In this work, the penetration effects of Cl^- in RRM derived from solid waste-based CSA cement was experimentally characterized. The impact of carbonization and the incorporation of hydrothermal carbon on the anti-Cl-permeation characteristics was investigated. The evolution of the mineral phase composition and microstructure of the RRM in response to Cl^- corrosion was analyzed. The results showed that ettringite in RRM was transformed into an unstable Cl-ettringite with elevated Cl^- concentrations, which subsequently decomposed into minerals such as zunyite. Nevertheless, ettringite adsorbs chloride onto its surface at low Cl^- concentrations, thereby impeding the diffusion of Cl^-. Carbonization reduced the resistance of RRM to the penetration of Cl^- in two ways: firstly, ettringite is carbonized to produce minerals such as CaCO₃ and CaSO₄∙2 H₂O, which reduces the binding capacity of RRM for Cl^-; secondly, carbonization results in smaller pore spaces and higher connectivity, which enhances capillarity and facilitates the penetration of the solution to the interior. The addition of hydrothermal carbon can improve the binding capacity of RRM for Cl^-, but does not prevent the carbonization process.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04956"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compressive behavior of prestressed SFRCFST stub columns after heating: Effect of fresh concrete compression technique","authors":"Manouchehr Nemati ,&nbsp;Arman Aminian ,&nbsp;Sepideh Rahimi ,&nbsp;Mahdi Nematzadeh ,&nbsp;Mobin Jafarzadeh-Taleshi ,&nbsp;Huu-Tai Thai","doi":"10.1016/j.cscm.2025.e04968","DOIUrl":"10.1016/j.cscm.2025.e04968","url":null,"abstract":"<div><div>One innovative and effective technique to enhance the compression response of concrete-filled steel tube (CFST) columns is the compression of the fresh concrete, which actively confines the concrete core by prestressed steel tubes. To utilize active confinement in structural design, the behavior of prestressed CFST columns under different conditions should be investigated. In this research, the compression response of steel fiber-reinforced concrete-filled steel tube (SFRCFST) stub columns prestressed by the fresh concrete compression (FCC) technique was assessed before and after experiencing heat. Toward this goal, 60 cylindrical SFRCFST specimens were fabricated, with key variables of the prestressing ratio, volume percentage of steel fibers, applied temperature, external diameter-to-wall thickness ratio (D/t) of steel tube, and water/cement ratio. Post-heating axial compression tests examined the loading capacity, ductility, peak strain, toughness, and load-strain response. It was revealed that due to prestressing and the temperature rise to 600 °C, the heat-induced reduction in load capacity was negligible, while this drop was notable in the specimens without prestressing. At a temperature of 600°C, the load-bearing capacity of the specimens with a prestressing ratio of 0.5 <em>f</em>_<em>y</em> increased by 40 % compared to the non-confined specimens, while the axial and lateral strain capacities decreased by 40 and 49 %, respectively. With an increase in the prestressing ratio to 0.7 <em>f</em>_<em>y</em>, the load-bearing capacity increased by 50 %, and the axial and lateral strain capacities decreased by 26 and 25 %, respectively. In prestressed and non-prestressed SFRCFST columns, with or without thermal exposure, a steel fiber content of up to 1.5 % improved toughness and increased peak strain and ductility in most specimens. Finally, the nonlinear regression analysis was employed to present a proper prediction model for the loading capacity of SFRCFST columns.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04968"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of the elastic properties and strength of unidirectional carbon fiber reinforced polymers based on representative volume element simulation","authors":"Miao Su ,&nbsp;Lei Liu ,&nbsp;Yuxi Xie ,&nbsp;Hui Peng ,&nbsp;Chongjie Kang","doi":"10.1016/j.cscm.2025.e04963","DOIUrl":"10.1016/j.cscm.2025.e04963","url":null,"abstract":"<div><div>The mechanical properties of unidirectional carbon fiber reinforced polymer (UD-CFRP), such as its elastic modulus and ultimate strength, are crucial and fundamental indicators. Examining these properties from a microscopic perspective through numerical simulations can provide valuable insights for material modification and the design of new materials. This study employs a micromechanics-based representative volume element (RVE) method to predict the macroscopic mechanical properties of UD-CFRP. The results demonstrate that the established RVE models accurately predict the elastic and shear modulus, as well as the ultimate tensile and compressive strength of UD-CFRP. Additionally, simulations of 300 RVE models with varying input parameter combinations were performed, generating a dataset that encompasses both microstructure parameters and macroscopic mechanical properties of UD-CFRP. Using the dataset, random forest regression models were created and SHAP analysis was performed to identify the key microstructural parameters with significant feature importance. Subsequently, we systematically investigated their effects on the macroscopic mechanical properties of UD-CFRP. In the end, simplified analytical prediction formulas were proposed to evaluate the macroscopic mechanical properties of UD-CFRP, demonstrating superior predictive performance compared to existing formulas.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04963"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating moisture safety strategies in CLT buildings – predictions vs actual outcomes","authors":"Kristo Kalbe,&nbsp;Targo Kalamees","doi":"10.1016/j.cscm.2025.e04958","DOIUrl":"10.1016/j.cscm.2025.e04958","url":null,"abstract":"<div><div>This study evaluated moisture safety strategies and construction practices in two non-residential CLT buildings through predictive analyses and on-site observations. The measured moisture content (MC) ranged from 9 %–18 % in the first building (excluding the areas with damaged end-grain protection), 12 %–18 % in the first-floor panels of the second building (with end-grain protection), and up to 40 % in its unprotected second-floor panels. Localised damage to end-grain protection and a poorly designed floor panel connection joint caused moisture issues in the first building where material replacement was necessary. In the second building elevated MC in the second-floor panels warranted mechanically aided moisture dry-out. Readiness to mitigate moisture problems was deemed necessary regardless of the protection method used against water ingress. Prolonged exposure to outdoor air, even when under temporary weather protection increased MC in the case of the first building, however the temporary weather protection proved effective in protecting against rain. Undamaged end-grain protection was also deemed effective. The predictive analyses of moisture safety strategies indicated that in 6 of 10 cases for the first building and in all cases for the first-floor panels of the second building a moisture safe outcome was expected. However, no moisture-safe outcomes were indicated for the second-floor panels of the second building. The results demonstrate the benefits of predictive analyses which likely could have prevented the selection of a solution without end-grain protection in the second-floor panels in the second building, as evidenced by measurable data. The outcomes rely on design and planning quality, so including specific moisture safety drawings and a moisture safety strategy analysis within the building design is recommended.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04958"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of resilient behavior of a fine-grained subgrade filler under graded variable confining pressure","authors":"Fang Xu ,&nbsp;Youwei Chen ,&nbsp;Qishu Zhang ,&nbsp;Junli Dong ,&nbsp;Wuming Leng ,&nbsp;Qi Yang","doi":"10.1016/j.cscm.2025.e04960","DOIUrl":"10.1016/j.cscm.2025.e04960","url":null,"abstract":"<div><div>The prestressed subgrade is a novel subgrade reinforcement technique wherein horizontal prestress is applied to the subgrade soil through prestressed reinforcement devices. The applied prestress propagates from the slope to the interior of the subgrade, thereby enhancing the confining pressure (<em>σ</em>₃) of the subgrade filler/soil. A series of dynamic triaxial tests with graded variable confining pressure was performed to assess the impact of horizontal prestress on the resilient behavior of a typical fine-grained subgrade filler. The resilient modulus (<em>M</em>_R) characteristics and its variation patterns were meticulously analyzed and discussed. The results demonstrate that graded increasing <em>σ</em>₃ could enhance the subgrade filler’s resistance to dynamic elastic deformation, thereby significantly improving its <em>M</em>_R, with final increments around 10 MPa. The dynamic loading cycle interval (<em>N</em>_c) between two adjacent graded confining pressures markedly influences the developmental trend of <em>M</em>_R, and earlier increasing <em>σ</em>₃ and smaller <em>N</em>_c lead to a higher stable <em>M</em>_R of the filler. Each graded increment in the <em>σ</em>₃ initially results in an immediate increase in the specimen’s <em>M</em>_R, which is subsequently followed by a decline and eventual stabilization with increasing the dynamic loading cycles. Additionally, the advantages of graded increasing <em>σ</em>₃ may not counterbalance the detrimental effects of increased moisture content on the <em>M</em>_R. Subsequently, a prediction model for the <em>M</em>_R was developed accounting for the conditions of graded variable confining pressure. The model was validated by a high degree of concordance between the predicted and measured <em>M</em>_R values of a stable specimen.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04960"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Re – activation of recycled fly ash – based geopolymer binder to enhance mechanical properties","authors":"A. Naghizadeh ,&nbsp;M. Welman-Purchase ,&nbsp;L. Lagrange ,&nbsp;S.O. Ekolu ,&nbsp;L.N. Tchadjie","doi":"10.1016/j.cscm.2025.e04967","DOIUrl":"10.1016/j.cscm.2025.e04967","url":null,"abstract":"<div><div>This research delved into employment of thermal activation as a technique of enhancing the reactivity of recycled binders produced from parent hardened geopolymer systems. The production process involved crushing hardened fly ash – based geopolymer pastes and concretes, followed by milling the resulting powder to produce non – calcined or raw recycled binders, that were in turn exposed to various high temperatures of 250° to 550 °C, then used to prepare geopolymer paste mixtures at activator to binder ratio of 0.5. The alkali activator used was a combined solution mixture of sodium silicate and 12 M sodium hydroxide. The recycled binders produced were characterised using particle size /shape analysis, Brunauer – Emmett – Teller surface area measurements and thermogravimetry, prior to microanalyses. The synthesized paste mixtures were evaluated to determine their setting times and compressive strength values, followed by analytical studies done using X – Ray Diffraction, Fourier – Transform Infrared Spectroscopy and Scanning Electron Microscopy. Results showed that setting times of the raw or calcined recycled binder – based geopolymer mixtures were a drastic 70–90 % shorter than those of the control fly ash – based paste. It was found that calcination substantially enhanced geopolymeric reactivity of recycled binders, increasing the strengths of their mixtures by 36–54 %. Interestingly, mixtures that were synthesized using the paste – derived recycled binder calcined at the optimal 400 °C temperature, exhibited strength development that was similar or comparable to that of the control fly ash – based geopolymer paste.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04967"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 CO₂-ceramsite foam concrete: Mechanical properties, microstructure and environmental benefits","authors":"Jing Zhang ,&nbsp;Yuxin Su ,&nbsp;Hongshuai Gao","doi":"10.1016/j.cscm.2025.e04957","DOIUrl":"10.1016/j.cscm.2025.e04957","url":null,"abstract":"<div><div>With the advancement of the global carbon neutrality goal, the construction industry, as a major resource consumption and carbon emission sector, is facing increasingly severe environmental pressures. Building material production not only consumes substantial energy but also generates significant CO₂ emissions. This context necessitates the development of novel low-carbon materials and carbon sequestration technologies. This study proposes a novel CO₂-foamed ceramsite foam concrete (CCFC), and systematically investigates its mechanical properties, multi-scale pore structure evolution, and environmental benefits through experimental approaches. CO₂ foaming significantly refined the pore structure of CCFC, enhancing its compressive strength and water absorption capacity while reducing thermal conductivity. Multi-scale analyses from macro to micro levels revealed that CaCO₃ generated through carbonation filled pores and optimized pore distribution. Life cycle assessment (LCA) demonstrated that each cubic meter of CCFC sequesters approximately 25 kg CO₂, reducing global warming potential (GWP) by 12 % compared to conventional ceramsite foam concrete (CFC). These findings indicate that CCFC can serve as a sustainable alternative to traditional insulation materials in building envelopes, significantly lowering carbon footprints in construction projects. By integrating CO₂ sequestration into lightweight concrete production, this technology aligns with global carbon neutrality goals and offers a scalable solution for reducing embodied carbon in urban infrastructure. Furthermore, the improved mechanical and thermal performance of CCFC supports its application in energy-efficient buildings, contributing to both structural safety and long-term energy savings. The findings offer practical guidance for scaling low-carbon construction practices. Compared to other emerging low-carbon concretes such as geopolymer or mineralized systems, CCFC demonstrates a balanced integration of environmental performance, structural applicability, and industrial scalability.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04957"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144364391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexural strengthening of corroded steel beams with CFRP by using the end anchorage: Experimental, numerical, and machine learning methods","authors":"Amin Shabani Ammari ,&nbsp;Younes Nouri ,&nbsp;Habib Ghasemi Jouneghani ,&nbsp;Seyed Amin Hosseini ,&nbsp;Arash Rayegani ,&nbsp;Mehrdad Ebrahimi ,&nbsp;Pooria Heydari","doi":"10.1016/j.cscm.2025.e04966","DOIUrl":"10.1016/j.cscm.2025.e04966","url":null,"abstract":"<div><div>This article presents the mechanical behavior of corroded steel beams that have been strengthened with carbon fiber-reinforced polymer (CFRP) layers in order to mitigate the effects of corrosion. Six beams are analyzed experimentally, including unreinforced and CFRP-reinforced specimens, with regard to the corrosion percentage, location, and shape on strength, ductility, and modes of failure. In the beam with 50 % corrosion, reinforcing with CFRP compensated for the strength reduction. In the beam with 100 % corrosion, after CFRP reinforcement, the strength was only 4 % lower than that of the control beam. A new end anchorage system was developed to avoid CFRP slippage, ensuring full utilization of its tensile capacity. Numerical modeling further validated the experimental results and then numerical specimens were used for parametric and Machine Learning (ML) studies. The results indicated that corrosion in the upper flange gave the most severe strength reduction up to 39.7 %, although this was effectively mitigated by CFRP reinforcement. The ML prediction showed that the CatBoost algorithm had the highest accuracy, with an <span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> score of 0.954. Additionally, the feature importance analysis revealed that the location and level of the corrosion are the most influential features affecting the reduction in the capacity of the corroded beam.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04966"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meso-scale mechanical damage behavior of ECC-repaired wide and narrow joints of longitudinally continuous slab tracks","authors":"Long Chen ,&nbsp;Tianzhi Xuan ,&nbsp;Jinjie Chen ,&nbsp;Fengzhuang Tong ,&nbsp;Yujie Feng ,&nbsp;Yang Yang","doi":"10.1016/j.cscm.2025.e04959","DOIUrl":"10.1016/j.cscm.2025.e04959","url":null,"abstract":"<div><div>The narrow and wide joint concrete of longitudinally continuous slab tracks is prone to diseases such as crushing and cracking under temperature load, which affects the integrity and durability. Therefore, this paper introduces high-toughness Engineered Cementitious Composites (ECC) as the repair material for the wide and narrow joints and conducts experimental and numerical investigation on the temperature-induced meso-scale damage characteristics. Firstly, experimental tests were carried out to determine the bonding parameters between concrete and ECC. Then, a macro-meso simulation model of longitudinally continuous slab tracks that accounts for the meso-scale characteristics of the wide and narrow joints and the nonlinear interlayer bond behavior was constructed using a sub-modeling approach. Finally, the meso-scale damage behavior and interface damage characteristics of the wide and narrow joints under different fiber contents, matrix strengths, and interface bond strengths under overall temperature loads were studied. Results show: (1) The fracture load of wide and narrow joints with 2.5 % fiber added is 31 % higher than that without fiber added, but it has little effect on the initial crack load and displacement. (2) The influence of matrix strength on damage follows a linear pattern. When the concrete strength increased from C35 to C60, the maximum compressive damage factor of the wide and narrow joints under temperature rise decreased from 0.9237 to 0.4752. (3) Improving the normal strength of the bonding surface and reducing the tangential stiffness can effectively delay the initiation of interface damage.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04959"},"PeriodicalIF":6.5,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144336004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}