Construction and Building Materials最新文献

{"title":"Thermally modified attapulgite as a green functional modifier for VOCs suppression in SBS modified asphalt composites","authors":"Hao Lai ,&nbsp;Anhua Xu ,&nbsp;Jianliang Zhai ,&nbsp;Weirong Guo ,&nbsp;Youjie Zong ,&nbsp;Haoyan Guo ,&nbsp;Bowen Guan ,&nbsp;Mingfeng Chang ,&nbsp;Rui Xiong ,&nbsp;Zhenjun Wang","doi":"10.1016/j.conbuildmat.2026.145901","DOIUrl":"10.1016/j.conbuildmat.2026.145901","url":null,"abstract":"<div><div>During asphalt binder heating and paving, volatile organic compounds (VOCs) emissions unavoidably pose significant threats to human health and environment. This study investigated the feasibility of utilizing thermally modified attapulgite (TMA) as a green adsorption additive to mitigate VOCs emissions in SBS modified asphalt binder. TG experiments identified critical heat modification temperatures (110 °C, 250 °C, 520 °C, and 690 °C) for attapulgite (ATP) to regulate its physicochemical properties. Structural evolution and surface characteristics were systematically analyzed via XRD, FTIR, BET and Zeta potential techniques, while GC-MS was employed to evaluate VOCs emission behavior of ATP-SBS composite modified asphalt binder under heating conditions. Results show ATP modified at 520 °C (TMA520) achieved the highest VOCs reduction efficiency of 52.7%, attributed to retained surface structure and optimized pores. Furthermore, TMA520 significantly enhanced the high temperature performance of SBS modified asphalt binder. Although interaction with binder is physical, TMA520's high zeta potential ensures uniform dispersion and provides strong electrostatic adsorption for VOCs. Its hierarchical pore structure is crucial: macropores/mesopores capture and transport VOCs, while micropores immobilize them. This work demonstrates an effective approach for utilizing eco-functional minerals in binder, promoting cleaner pavement construction, particularly in ecologically sensitive regions.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145901"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388452","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":"Study on mix design and properties of basalt fiber-reinforced concrete for bridge deck pavements in dry-cold regions with large temperature differences","authors":"Aiqin Shen,&nbsp;Yake Zhang ,&nbsp;Penglong Fan,&nbsp;Yinchuan Guo","doi":"10.1016/j.conbuildmat.2026.145919","DOIUrl":"10.1016/j.conbuildmat.2026.145919","url":null,"abstract":"<div><div>To improve the durability of bridge deck pavement concrete in dry-cold regions with large temperature differences, this study investigated the mix design and performance of basalt fiber-reinforced concrete (BFRC). Mortar tests combined with principal component analysis (PCA) were first conducted to optimize basalt fiber parameters, resulting in a diameter of 13–20 μm, a length of 6–18 mm, and a content of 0.06–0.10%. Subsequently, a four-factor, three-level orthogonal experimental design coupled with a combined weighting–grey relational analysis method was employed to determine the optimal mix proportion, consisting of 0.08% basalt fiber content, 10% fly ash replacement, 1.0% water reducer content, and a sand ratio of 38%. The optimized BFRC exhibited enhanced mechanical and durability performance. Compared with the reference concrete (RC), the 28-day compressive strength and flexural strength increased by 23.4% and 20.4%, respectively, while the mass loss rate after 300 freeze–thaw cycles and the chloride ion permeability decreased by 30.4% and 50.9%, respectively. Under large temperature fluctuation curing conditions, BFRC showed improved performance retention. SEM observations further revealed that basalt fibers restrained microcrack development through crack-bridging effects and reduced the connectivity of microcrack–pore networks after freeze–thaw exposure, providing microstructural support for the enhanced durability. These results offer theoretical insight and practical guidance for the design of durable bridge deck pavement concrete in dry-cold regions with large temperature differences.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145919"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388213","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":"Effect of C2S and limestone powder contents on interfacial bond characteristics of high-strength steel fibers embedded in low-carbon mortars","authors":"Van Thong Nguyen ,&nbsp;Van Phi Dang ,&nbsp;Hyeon Woo Noh ,&nbsp;Dong Joo Kim","doi":"10.1016/j.conbuildmat.2026.145869","DOIUrl":"10.1016/j.conbuildmat.2026.145869","url":null,"abstract":"<div><div>This study explores influence of dicalcium silicate (C₂S) and limestone powder (LP) contents on the interfacial bond characteristics of smooth and hooked steel fibers embedded in low-carbon mortars. Four mortar compositions with varying LP (0–30%) and C₂S (16.4–57.2%) contents were evaluated through single-fiber pullout, compressive tests, SEM–EDS, and nanoindentation (NI) analyses. A mixture containing 10% LP substitution in belite-rich cement (BRC) exhibited optimal performance and sustainability. Although increased C₂S content in BRC reduced early-age strength, it significantly enhanced the long-term mechanical and interfacial properties and improved the 90-day compressive strength, bond strength, and pullout energy by up to 65%. Higher LP levels yielded denser fiber–matrix interfacial zones (FMZs) and reduced porosity (25.0%→18.9%), while elevated C₂S promoted greater C-S-H formation (34.6%→51.5%). The optimized LP–BRC system demonstrated superior durability and interfacial performance with substantially lower CO₂ emissions, offering a viable and sustainable alternative to ordinary Portland cement (OPC).</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145869"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388219","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":"Macro steel fiber effect on water permeability of concrete under coupled freeze-thaw cycles and compressive loading","authors":"Wei Guo ,&nbsp;Yining Ding ,&nbsp;Fernando Pacheco-Torgal","doi":"10.1016/j.conbuildmat.2026.145890","DOIUrl":"10.1016/j.conbuildmat.2026.145890","url":null,"abstract":"<div><div>The durability and damage mechanisms of concrete in cold regions are influenced by multiple coupled factors, including freeze-thaw (FT) cycles, mechanical loading, and moisture penetration. Water permeability directly plays a decisive role in durability, as water acts as the primary medium for aggressive agents to penetrate the matrix. This study investigates the water permeability of plain concrete (PC) and steel fiber reinforced concrete (SFRC) under compressive stress, both with and without exposure to FT cycles. The results show that the evolution of permeability with stress can be divided into three stages: a slight decrease, a slight increase, and a sharp increase. FT cycles substantially elevate permeability; for PC, the initial permeability rises from 2.99 × 10⁻¹¹ to 1.88 × 10⁻⁶ m/s, while the ultimate permeability increases 7.15 × 10⁻⁹ to 3.18 × 10⁻⁵ m/s after 100 FT cycles. Although steel fibers increase the initial permeability at 0 FT cycles (e.g., SFRC60 is 137% higher than PC), their beneficial effect becomes increasingly evident as the number of FT cycles increases. After 100 FT cycles, the initial and ultimate permeability of SFRC60 decrease by 71.6% and 97%, respectively, compared with those of PC. Moreover, under high stress levels (stress level &gt; 0.65, where stress level is defined as the ratio of applied compressive stress to the peak compressive stress of each specimen), SFRC consistently exhibits lower permeability than PC, with the difference becoming more evident as the number of FT cycles increases. These findings demonstrate that steel fibers significantly enhance the frost resistance and overall durability of concrete under the combined actions of compressive stress and FT cycling.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145890"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388221","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 analysis and finite element simulation of the flexural performance of glued laminated bamboo beam string structures","authors":"Mingmin Ding ,&nbsp;Zhenliang Hua ,&nbsp;Yu Lin ,&nbsp;Xiancai Zhong ,&nbsp;Jiyang Yi ,&nbsp;Yang Wei","doi":"10.1016/j.conbuildmat.2026.145854","DOIUrl":"10.1016/j.conbuildmat.2026.145854","url":null,"abstract":"<div><div>To address the low flexural stiffness and limited deformation of glued laminated bamboo (GLB) beams, this study introduces the beam string structure (BSS) system, aiming to investigate the effects of strut configuration and rise height on their flexural performance. Static tests were conducted on eight full-scale specimens, which were explicitly categorized into two configurations: (a) Straight BSS, varying in strut number (single vs. double) and strut length (130 mm vs. 160 mm); and (b) Arched BSS, varying in rise height (50 mm, 100 mm, and 150 mm). Simultaneously, a numerical model incorporating tension-compression asymmetry and Extended Finite Element Method (XFEM) damage mechanisms was established, and theoretical formulas covering the entire loading process were derived. Results indicate that the BSS system significantly improved the mechanical performance of GLB beams. Among the straight configurations, the double long-strut type (TLSSB2S) exhibited optimal performance, with ultimate load capacity and energy dissipation increasing by 52.9% and 64.6%, respectively, compared to the pure beam. Conversely, for the simply supported arched configurations, both load capacity and stiffness showed a degradation trend as rise height increased. Numerical and theoretical predictions agreed well with experimental data, validating the effectiveness of this system for engineering applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145854"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388289","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":"Precision-tailored waterjet-cut composite fibers for ultra-high-performance concrete: Fabrication process and mechanical performance","authors":"Yanran Meng,&nbsp;Yu Xiang,&nbsp;Tao Yu","doi":"10.1016/j.conbuildmat.2026.145856","DOIUrl":"10.1016/j.conbuildmat.2026.145856","url":null,"abstract":"<div><div>Ultra-high-performance concrete (UHPC) relies critically on discrete fibers to achieve its exceptional mechanical properties. The use of corrosion-resistant fibers may become essential when the concrete is exposed to harsh environment (e.g., marine environment), or when it incorporates seawater and/or sea-sand. This study develops a novel type of fiber-reinforced polymer (FRP) composite-based macro fibers (referred to as composite fibers), fabricated using computer numerical control (CNC) machining, specifically, a waterjet cutting process. This method enables precise customization of fiber properties, including their shape and dimensions. A series of tests were conducted to evaluate the performance of the composite fibers in four different configurations, namely, straight fibers, hooked-end fibers, and corrugated fibers with two distinct wave heights. The results revealed that the bond strength of the composite fibers significantly exceeded that of corresponding straight steel fibers and polypropylene (PP) fibers. The corrugated composite fibers exhibited higher bond stiffness than their straight counterparts, attributed to enhanced mechanical interlocking with the concrete matrix; however, premature rupture initiated at bent/turning regions, which may limit peak bond mobilization. Furthermore, the tensile and compressive strengths of ultra-high-performance seawater sea-sand concrete (UHPSSC) reinforced with the composite fibers were significantly higher than that with PP fibers. These findings highlight the potential of precision-tailored, corrosion-free composite fibers as a practical reinforcement option for UHPC/UHPSSC applications in corrosion-prone environments. Future work should optimize the corrugated composite fiber laminate/geometry to mitigate turning-region rupture and fully exploit the bond benefits.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145856"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388454","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":"Mechanical and gamma-ray shielding performance of waste ceramic substituted magnetite concrete under high temperatures","authors":"Kai Ji ,&nbsp;Zhenfu Chen ,&nbsp;Qiuwang Tao ,&nbsp;Qiongfang Wu ,&nbsp;Dan Wu ,&nbsp;Minghui Wang","doi":"10.1016/j.conbuildmat.2026.145799","DOIUrl":"10.1016/j.conbuildmat.2026.145799","url":null,"abstract":"<div><div>To synergistically enhance radiation shielding performance while promoting resource sustainability, this study developed a high-density radiation-shielding concrete by substituting magnetite fine aggregate with waste ceramic fine aggregate at volumetric replacement ratios of 0%, 20%, 40%, 60%, 80%, and 100%. The thermal response (25 ℃, 300 ℃, 450 ℃, 600 ℃) was systematically evaluated in terms of mass loss ratio, ultrasonic pulse velocity（UPV）, macro-mechanical properties, microstructural evolution, and gamma-ray linear attenuation coefficient (μ) characteristics. Multi-scale mechanisms were elucidated via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results demonstrate that moderate ceramic incorporation optimizes internal humidity distribution and reinforces the interfacial transition zone (ITZ). The 60% replacement mixture exhibited optimal comprehensive performance within 300–450 ℃, with significantly higher compressive strength, splitting tensile strength, and UPV than the control (0% replacement), indicating superior thermo-mechanical stability. Even under extreme 600 ℃ exposure, although compressive strength slightly decreased, splitting tensile strength remained higher than that of the control. SEM analysis revealed reduced ITZ porosity and enhanced densification in the 60% mixture; at 300 ℃, secondary hydration, triggered by internal curing, generated C-S-H gel that effectively filled and “healed” thermally induced microcracks. Gamma-ray shielding performance was evaluated using the μ and the mass attenuation coefficient (μₘ). At different temperatures, as the replacement ratio increased, μ showed a decreasing trend, whereas μₘ showed an increasing trend. In conclusion, the 60% waste ceramic replacement ratio achieves synergistic optimization among load-bearing capacity, thermal-damage tolerance, and radiation-shielding efficiency, offering a green functional material with environmental compatibility and high-temperature service reliability for nuclear facilities, civil defense projects, and medical radiation shielding structures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145799"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388229","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 assessment of natural and salt-modified travertines for gamma-ray protection in construction materials","authors":"A.V. Korkmaz ,&nbsp;M. Sert ,&nbsp;E. Kemah ,&nbsp;H. Yakut","doi":"10.1016/j.conbuildmat.2026.145909","DOIUrl":"10.1016/j.conbuildmat.2026.145909","url":null,"abstract":"<div><div>In this study, the gamma-ray shielding performance of natural and salt-modified travertine stones is experimentally investigated over the photon energy range of 0.511–1.332 MeV using a 3″× 3″ NaI (Tl) detector system and standard point gamma-ray sources (²²Na, ¹³⁷Cs, ⁶⁰Co). Salt modification is achieved through a controlled salt crystallization process designed to simulate the long-term salt-exposure effects commonly observed in building stones. The linear and mass attenuation coefficients are determined, and key radiation shielding parameters, including half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), radiation protection efficiency (RPE), and effective atomic number, are evaluated. Theoretical calculations are also computed using the Phy-X software for comparison. The results indicate that salt crystallization results in only minor variations in gamma-ray attenuation properties of travertines, with natural and salt-modified samples exhibiting comparable shielding performance across the investigated energy range. Over the investigated energy range (0.511–1.332 MeV), the studied travertines exhibit MAC values of 0.094–0.055 cm²/g, comparable to those of natural rocks with similar density, highlighting their potential as alternative photon-shielding materials. The evaluation revealed that the highest attenuation coefficients were achieved by the PT-C sample, with MAC and LAC values of 0.1082 cm²/g and 0.2906 cm⁻¹ at 0.511 MeV, respectively. Consequently, the lowest transmission parameters were also recorded for this sample, showing an HVL of 2.385 cm and an MFP of 3.441 cm at the same energy. Owing to their natural origin, durability, and low-energy processing requirements, travertine stones may offer sustainability advantages as secondary or auxiliary gamma-ray shielding materials in architectural and construction applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145909"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388457","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":"Synergistic surface modification for high-strength Al/PA6 joints: Failure mechanisms unveiled by in-situ SEM push-out shear testing","authors":"Lingpei Kong ,&nbsp;Tianye Yang ,&nbsp;Shubin Liu ,&nbsp;Shunbo Wang ,&nbsp;Yuhang Wu ,&nbsp;Hang Zhu","doi":"10.1016/j.conbuildmat.2026.145862","DOIUrl":"10.1016/j.conbuildmat.2026.145862","url":null,"abstract":"<div><div>Polymer-metal hybrid structures are increasingly utilized in modern construction and engineering applications due to their superior lightweight properties and structural efficiency. However, achieving reliable interfacial bonding between chemically dissimilar thermoplastics and metals remains a critical challenge for the structural integrity of these injection-molded components. This paper proposes a synergistic surface modification strategy combining alkaline etching, hot water treatment, and plasma activation (AHP) to construct hierarchical micro/nano structures on 6061-T6 aluminum alloy surfaces to enhance interfacial activity. This strategy significantly improves the bonding strength of the injection-molded joint between 6061-T6 aluminum alloy and 30 wt% glass fiber reinforced polyamide 6 (GF30%-PA6). This paper uses <em>in-situ</em> scanning electron microscopy and shear test methods to visualize the failure evolution process of dynamic interfaces. Results indicate that the shear strength of the AHP-modified joint surges to 34.82 MPa. <em>In-situ</em> SEM observations confirm that damage preferentially initiates from micro-defects within the GF30%-PA6 matrix adjacent to the interface. The failure trajectory subsequently bifurcates into either interfacial debonding (adhesive failure) or matrix-dominated cracking (cohesive failure). This bifurcation is rationalized by correlating DIC-derived strain localization/dissipation indicators with the macroscopic interfacial fracture energy <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> obtained from the global load–displacement response. These findings provide direct experimental evidence and mechanistic guidance for optimizing high-load-bearing polymer–metal hybrid joints used in structural applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145862"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388228","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":"Study on autogenous shrinkage of carbon nanotubes modified rockfill dam face slab concrete at early age under different temperature","authors":"Zhifang Zhao ,&nbsp;Zhuojun Hu ,&nbsp;Yanxia Liu ,&nbsp;Chengzhuo Xie ,&nbsp;Yanming Liu ,&nbsp;Zhigang Zhao ,&nbsp;Yubing Ouyang ,&nbsp;Tao Shi","doi":"10.1016/j.conbuildmat.2026.145797","DOIUrl":"10.1016/j.conbuildmat.2026.145797","url":null,"abstract":"<div><div>Autogenous shrinkage is one of the important factors affecting early-age cracking of concrete face slabs in rockfill dams. Carbon nanotubes (CNTs) possess excellent potential to enhance the performance of face slab concrete. The autogenous shrinkage behavior of CNTs-modified face slab concrete urgently requires investigation. Currently, studies on the effect of temperature on autogenous shrinkage often focus on a single temperature condition. To address this limitation, this study investigates the effects of different curing temperatures (20°C, 30°C, and 40°C) and CNT dosages (0%, 0.03%, 0.06%, 0.10%, and 0.15%) using cement paste. The results showed that an increase in curing temperature significantly accelerates the early-age autogenous shrinkage rate, particularly within the first 24 h, and also intensifies the ultimate shrinkage magnitude. Similarly, a higher CNT content was found to enhance both the development speed and the final value of early-age autogenous shrinkage. Furthermore, a multiscale model for early-age autogenous shrinkage of cement paste was established by integrating continuum micromechanics with capillary pressure theory, which provided good agreement with the experimental data. The results showed that chemical shrinkage in the unsaturated humidity stage is driven by capillary pressure. Moreover, the model indicates that chemical shrinkage accounts for the majority of autogenous shrinkage, approximately over 70% of the total. It also reveals that the effects of temperature and CNTs on autogenous shrinkage primarily manifest through accelerated early-age cement hydration, increased chemical shrinkage during the humidity-saturated phase, and the prolonged duration of this phase.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145797"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388232","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}