Journal of building engineering最新文献

{"title":"A dual-condition analytical framework for evaluating the residual capacity of reinforced concrete columns subjected to borehole blasting","authors":"Yingkang Yao, Jinhao Zhang, Qiang Zhang, Yize Kang, Yongqi Fan, Yongsheng Jia, Jinshan Sun, Lingling Hu, Yu Yan","doi":"10.1016/j.jobe.2026.117522","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117522","url":null,"abstract":"This study investigates the correlation between borehole blasting-induced damage severity and the residual load-carrying capacity of reinforced concrete (RC) columns to support quantitative post-blast stability assessment. Five full-scale RC column specimens were used, comprising one preliminary trial-blast specimen and four formal specimens subjected to charge masses of 20, 30, 50, and 75 g per borehole. Experimental results demonstrated that an increase in the concrete volume loss ratio from 15% to 62% reduced the residual capacity to 4.8% of the theoretical initial load-carrying capacity. A dual-condition analytical model was established to represent the change in post-blast load-bearing behavior. Condition 1 evaluates the continuous cross-sectional degradation driven by concrete material damage gradients under low-intensity regimes. Condition 2 formulates the discrete load-bearing state at the blast cavity under high-intensity regimes, quantifying the residual capacity through the baseline resistance of the core rubble zone, the second-order stability reduction of exposed reinforcements, and the eccentricity-induced capacity reduction. For the four tested specimens, the relative deviations between the analytical and experimental capacities ranged from 3.47% to 15.65%, with the largest deviation occurring for the 50 g specimen. A multidimensional damage index was subsequently proposed, with <mml:math altimg=\"si1.svg\"><mml:mrow><mml:mi>D</mml:mi><mml:mo linebreak=\"goodbreak\" linebreakstyle=\"after\">=</mml:mo><mml:mn>0.75</mml:mn></mml:mrow></mml:math> adopted as the lower boundary of the extreme damage grade. Within the investigated configuration, the proposed framework provides a mechanics-based approach for assessing the residual capacity of internally blast-damaged RC short columns.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"7 1","pages":"117522"},"PeriodicalIF":6.4,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123561","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":"Experimental investigation on pull-out behavior and failure mechanism of T-shaped perfobond rib connectors","authors":"Wenfeng Huang, Cheng Zhang, Wenting Lyu, Junhu Shao, Bo Tian, Yulin Zhan","doi":"10.1016/j.jobe.2026.117490","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117490","url":null,"abstract":"The T-shaped perfobond rib (PBL) is a new type of steel-concrete interface connector with superior mechanical performance. Nevertheless, its tensile behavior is not well understood due to the complex geometry and multi-factor coupling effects, resulting in limited reliable references for design processes. Therefore, eleven pull-out tests were conducted to investigate the failure mechanisms, load-displacement responses, and load-strain characteristics of T-shaped PBLs. The effects of connector type, flange width, flange thickness, embedment depth, connector length, and perforating rebar on the tensile capacity were evaluated and discussed. Finally, a modified analytical model was proposed to predict the ultimate tensile capacity. Test results showed that the failure started at the flange and propagated toward the concrete surface at an angle of approximately 26°. The tensile capacity of the T-shaped PBL was 2.14 times that of the conventional PBL. Embedment depth and connector length were identified as the dominant parameters affecting tensile capacity, whereas the influence of flange width was less than 5%. Compared to the standard specimen, the tensile capacity changed by approximately 18.2% and 11.7% on average, corresponding to a 20% change in embedment depth and a 25% increase in connector length, respectively. Flange thickness had a relatively significant effect, with a 13.2% capacity reduction observed for a 4 mm flange. The modified model showed favorable predictive performance, with a coefficient of variation of 0.05 for the calculated-to-test/FEA capacity ratio. This study could enhance the understanding of the tensile behavior of T-shaped PBLs and promote broader application in steel-concrete composite structures.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"53 1","pages":"117490"},"PeriodicalIF":6.4,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123852","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":"Straw fiber reinforced concrete: A comparative study of single and combined eco-friendly physical treatments on thermal, mechanical, and interfacial performance","authors":"Dayang Wang, Yongcheng Ji, Yizhen Li, Shuai Wang, Chenxuan Lu, Samuel Adu-Amankwah","doi":"10.1016/j.jobe.2026.117519","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117519","url":null,"abstract":"Straw fiber (SF) is a renewable, low-density reinforcement material for lightweight insulating concrete; however, its high water absorption and susceptibility to alkaline degradation limit its application. Furthermore, the thermal insulation performance of SF-reinforced concrete (SFC) has so far been evaluated only under dry conditions, whereas in-service moisture significantly affects heat transfer. In this study, ambient humidity was introduced as a variable into finite element simulations of heat conduction in SFC, and five eco-friendly physical treatments were compared: boiling water (B), acrylic coating (A), polyurethane coating (P), and combined boiling water–acrylic (BA) and boiling water–polyurethane (BP) treatments. A comprehensive evaluation based on mechanical properties, thermal conductivity, interfacial strength, and fiber water absorption yielded an overall ranking of BP &gt; BA &gt; P &gt; A &gt; B &gt; untreated (N). Compared with N-SFC, BP-SFC exhibited increases of 14.54% and 20.3% in compressive and flexural strength, respectively, a 49% improvement in interfacial strength, and a reduction in fiber water absorption from 362.6% to 172%. The coating treatments reduced the thermal conductivity from 1.350 to 1.238–1.282 W/(m‧K). The deviation between the simulated and experimental thermal conductivities of dry N-SFC was only 2.22%. The simulation results indicate that moisture significantly alters the heat flow field within untreated fibers, whereas hydrophobic coatings effectively block moisture-induced heat transfer, thereby explaining the mechanism by which waterproofing treatments enhance thermal insulation performance. These findings provide a low-cost, pollution-free approach for selecting fiber treatments for lightweight self-insulating concrete.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"52 1","pages":"117519"},"PeriodicalIF":6.4,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123560","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":"Hydration kinetics, phase assemblage and microstructural evolution of blended cements containing thermally activated marine dredged sediment","authors":"Anže Tesovnik, Sabina Dolenec, Matej Dolenec, Milena Marroccoli, Antonio Telesca","doi":"10.1016/j.jobe.2026.117503","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117503","url":null,"abstract":"Maintenance dredging generates large volumes of fine-grained marine sediment for which disposal capacity is increasingly limited, while conventional supplementary cementitious materials (SCMs) are unevenly available and locally constrained in supply. Thermal activation converts clay-rich sediment into a locally available SCM, but the hydration mechanisms of such mineralogically complex precursors, in particular the spatial development of the hydrate assemblage that governs macroscopic performance, remain insufficiently explored. Marine dredged sediment from the Gulf of Koper, a mixed clay–silt material, was thermally activated at 750 °C and evaluated as a SCM at 10, 30 and 50 wt% cement replacement, with a natural volcanic pozzolan as reference. Precursor transformation, hydration kinetics, phase assemblage, microstructure, pore structure and mortar strength were resolved within a single dataset. XRD, TG/DTA and FTIR confirmed clay-mineral dehydroxylation, structural disordering and partial carbonate decomposition. The activated sediment exhibited pozzolanic activity and higher 7-day cumulative heat release than the natural pozzolan, with portlandite consumption between 2 and 90 days reaching 44.5% and 62.0% at 30 and 50 wt% replacement, against 24.7% and 43.8% for the reference. Quantitative SEM-EDS phase segmentation, validated by principal component analysis and combined with two-point spatial correlation functions, resolved not only the abundance of the hydrate phases but also their distribution and connectivity: sediment-derived Si and Al were progressively incorporated into an intermixed C-A-S-H phase, early-age portlandite clusters were consumed and fragmented, and hemicarbonate-dominated AFm domains expanded at constant cluster shape. Pore refinement accompanied these changes, and 180-day compressive strength reached 57.0, 49.0 and 29.7 MPa for the 10, 30 and 50 wt% TTS replacements, respectively. The results establish a mechanistic and standard-compliant basis for valorizing locally available dredged marine sediment as a cement replacement material.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"31 1","pages":"117503"},"PeriodicalIF":6.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123563","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":"Pre-wetted recycled fine aggregate as a carbonate carrier: Storage-release behavior and effects on mortar hydration and interfacial structure","authors":"Zedong Qiu, Changdi Li, Minghao Dong, Yibing Liao, Dongyang Tian, Shuang Lu","doi":"10.1016/j.jobe.2026.117510","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117510","url":null,"abstract":"Residual old mortar weakens recycled fine aggregate (RFA) and its interface with new paste. This study examined Na<ce:inf loc=\"post\">2</ce:inf>CO<ce:inf loc=\"post\">3</ce:inf> pre-wetting as a means of storing releasable carbonate in RFA for subsequent aggregate mineralization and matrix modification. RFA was pre-wetted for 3 h with 0-12 wt% solutions, and direct-addition controls at matched nominal dosages were included. Background-corrected carbonate-equivalent release in deionized water increased with solution concentration. After 28 d in Ca-rich simulated pore solution, the RFA crushing value decreased by up to 16.9% relative to the water-prewetted reference. Compared with direct addition, RFA pre-wetting moderated stiffening, increased heat release between 24 and 72 h, and produced higher 28 d strengths. The paired 72 h cumulative heats nevertheless differed by no more than 3.6%. The 3-6 wt% mixtures also exhibited higher apparent NMR hydration and silicate chain-length indices than C0. Mortar strength increased up to 6 wt% and declined at higher concentrations. Relative to C0, C6 exhibited a 50.5% lower near-RFA low-gray area fraction, a 23.8% higher near-RFA indentation modulus, and a 37.8% higher 28 d compressive strength. The approximate defect-enriched width decreased from 55 to 35 μm. Further increasing the concentration to 12 wt% reduced later heat release and strength despite improved RFA crushing resistance in the simulated environment. These results support a dual-region strengthening interpretation involving aggregate-side mineralization and near-RFA matrix modification, with 6 wt% as the best tested pre-wetting solution concentration.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"21 1","pages":"117510"},"PeriodicalIF":6.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123564","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":"Depth vision-based indoor building behavior reconstruction in disaster scenarios: Integrating structural displacement and non-structural motion","authors":"Jiale Hou, Yi Zhang, Chen Gu, Tong Guo, Enjian Cai, Pengfei Ma","doi":"10.1016/j.jobe.2026.117474","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117474","url":null,"abstract":"This study presents a depth vision-based framework for high-fidelity reconstruction of indoor building behavior during disaster scenarios by jointly quantifying structural inter-storey displacement and the 6D motion of non-structural components (NSCs). The method targets the practical gap in existing Structural Health Monitoring systems, which commonly capture global structural responses while leaving NSC dynamics insufficiently measured, and it further addresses the scale ambiguity of conventional monocular vision approaches that cannot directly provide physical displacement without a reliable metric reference. The proposed pipeline integrates two core modules. First, an RGB-D 6D pose estimation strategy is implemented for NSCs using FoundationPose, where SAM-based masks support robust pose initialization and subsequent refinement and scoring to recover continuous pose trajectories under dynamic conditions. Second, an automated inter-storey displacement estimation module leverages depth information to compute a pixel-to-physical scale and homography for perspective rectification: the floor region is segmented by SAM, fused with depth to obtain 3D ground points, and fitted by RANSAC to enable geometric projection and scaled orthographic correction, after which IKCF tracking yields physical drift time histories. A dual-stage data acquisition workflow is also established, including pre-disaster 3D model preparation of NSCs and real-time synchronized RGB-depth capture during events. Validation in a Blender-based simulated disaster environment across three camera viewpoints shows that NSC translation RMSE remains within centimeters, typically below 0.04 m, and mean rotational errors stay below 5°, while inter-storey displacement RMSE reaches approximately 1.1–1.2 mm. Real-world scaled experiments further demonstrate feasible tracking performance with reconstructed NSC models and commodity RGB-D sensing, supporting the potential of the framework as a perception foundation for indoor disaster digital twins.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"52 1","pages":"117474"},"PeriodicalIF":6.4,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123565","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":"Investigation and control of early-age cracking in secondary lining concrete of plateau tunnel","authors":"Ming Li, Rui Yang, Yujiang Wang, Wen Xu, Qian Tian","doi":"10.1016/j.jobe.2026.117502","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117502","url":null,"abstract":"Tunnels are critical infrastructure in plateau regions, where suppressing early-age cracking of cast-in-place secondary lining concrete is essential for long term structural durability. This study investigates the internal environment and early-age cracking behavior of secondary lining concrete in plateau tunnels through shrinkage testing, field monitoring of temperature and deformation, and cracking risk assessment. A zoned crack control strategy is proposed and validated in engineering application. The results show that the tunnel interior maintains a relatively stable thermal environment and relatively high humidity. However, pronounced cracking occurs within 1 to 2 weeks after casting, even when concrete containing 40% fly ash is carefully cured. Low atmospheric pressure significantly increases drying shrinkage after 14 days, but has little effect on autogenous shrinkage. The waterproof membrane considerably reduces the restraint imposed by the initial support and surrounding rock, indicating that early-age cracking is mainly caused by thermal and autogenous shrinkage stresses exceeding the tensile strength of the concrete under invert constraint. High cracking risk is concentrated within the 2.0 m height above construction joints and low elsewhere. To balance performance and economy, a zoned strategy is adopted, with anti-cracking concrete used in the high risk zone and ordinary concrete in the remaining section. Field application shows that the anti-cracking concrete exhibits a 117.3% increase in average temperature expansion during the temperature rise stage and a 26.0% reduction in average temperature shrinkage during the temperature drop stage. No visible cracks were observed in the secondary lining over 8 months of field inspection, confirming the effectiveness of the proposed crack control strategy.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"28 17 1","pages":"117502"},"PeriodicalIF":6.4,"publicationDate":"2026-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123474","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":"Closing the loop: A material flow analysis of London’s commercial office fit out sector, using ten case studies, to develop a city-wide material bank for reuse","authors":"Nicola Forest, Darshil U. Shah","doi":"10.1016/j.jobe.2026.117454","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117454","url":null,"abstract":"This study presents a proof-of-concept bottom-up material flow analysis (MFA) of London's commercial office fit-out sector. Using component-level action research, the methodology developed in this study demonstrates potential to be scaled, by academics and practitioners, to develop a city-wide material bank that facilitates material reuse. Analysis of ten case study fit-outs, with a combined floor area of 287,772 m<ce:sup loc=\"post\">2</ce:sup>, identified an installed material stock of 1.79 million m<ce:sup loc=\"post\">2</ce:sup>. Temporal material flows to 2030 are modelled using two metrics developed in this study: Annual Retention Rate (ARR), which captures changes in material availability over time, and Reuse Efficiency (RE), which measures material recoverability. ARR remains consistently high (&gt;0.90) across all material categories; however, cumulative losses over an eight-year fit-out cycle results in a substantial reduction in available material stock, suggesting fit-out lifespans are constrained by material degradation. RE indicates that recoverability is strongly influenced by design for disassembly rather than material properties alone. The analysis identifies a “recovery gap”, whereby materials with high retention exhibit low recoverability, and introduces the concept of “single-cycle materials” to describe materials with limited or no reuse potential. Future research integrating dynamic MFA and life cycle assessment is proposed to evaluate material performance, aesthetic condition, and the environmental consequences of disposal prior to functional end-of-life. This could establish an optimal “ecological recovery window” for material recovery and inform strategies for circular design and material reuse.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"62 1","pages":"117454"},"PeriodicalIF":6.4,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123508","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":"Experimental study on fire resistance of externally prestressed concrete flexural members with CFRP tendons","authors":"Fei Zhou, Qingzhe Hao, Jiwen Zhang, Rui Pang","doi":"10.1016/j.jobe.2026.117484","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117484","url":null,"abstract":"By developing a composite fire protection system for carbon fiber reinforced polymer (CFRP) tendons, this paper presents results from experimental research and numerical analysis on the behavior of externally prestressed concrete (PC) flexural members subjected to combined effects of structural loading and fire exposure. Seven large-scale PC flexural members were tested to evaluate the structural behavior under ambient and fire conditions. The test variables included tension control force, load level, and coating thickness. The results indicate that the composite fire protection system consisting of ultra-thin fire-resistive coating, corrugated metal ducts, and rock wool can effectively reduce the temperature of CFRP tendons. Furthermore, increasing the thickness of the fire-resistive coating is beneficial to further improving the thermal insulation performance. With the increase of fire exposure time, the deflection of concrete members increases continuously. Once the stress of CFRP tendons exceeds their high-temperature ultimate tensile strength, subsequent tendon fracture induces member failure. It is also noted that a reduction in load level did not show a significant effect on prolonging the fire resistance time of the members tested in this study. The transverse expansion of CFRP tendons at elevated temperatures leads to the cracking and spalling of 3 mm-thick fire-resistive coating. However, when the thickness of the coating is increased to 7 mm, it can provide effective protection for CFRP tendons. Accordingly, the fire resistance time of the member is increased by approximately 53%. In addition, the failure criteria specified in ISO 834-1:2025 appear insufficient for fully understanding the fire-induced failure behaviors of the tested members. The evolution of the stress increment (<mml:math altimg=\"si1.svg\"><mml:mrow><mml:mo>Δ</mml:mo><mml:msub><mml:mi mathvariant=\"normal\">σ</mml:mi><mml:mi mathvariant=\"normal\">f</mml:mi></mml:msub></mml:mrow></mml:math>) provides insights into the failure process of externally PC members with CFRP tendons.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"293 1","pages":"117484"},"PeriodicalIF":6.4,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123842","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":"Interfacial and fiber-network regulation of strength-ductility balance in PE/PVA fiber-reinforced cementitious composites toward ultra-high ductility","authors":"Haoxuan Jia, Sijia Wang, Xiaoguang Li, Kai Qian, Dongyi Lei, Yang Ming, Ying Li, Yu Yang","doi":"10.1016/j.jobe.2026.117457","DOIUrl":"https://doi.org/10.1016/j.jobe.2026.117457","url":null,"abstract":"The strength-ductility balance of ultra-high ductility cementitious composites (UHDCC) is strongly governed by the effects of fiber-network structure, matrix compactness, and fiber-matrix interfacial behavior. To address this issue, this study proposes an interface and fiber-network oriented coordinated design strategy and investigates the effects of polyethylene (PE) and polyvinyl alcohol (PVA) fibers with mineral admixtures, including silica fume (SF) and limestone powder (LS), on the microstructural characteristics and macroscopic performance of fiber-reinforced cementitious composites toward ultra-high ductility. Unlike studies focusing on the individual effects of fibers or mineral admixtures, this work emphasizes the coupling relationship among matrix densification, interfacial pull-out behavior, pore structure evolution, and tensile strain-hardening behavior. The results demonstrate that PVA fibers form stronger interfacial bonding through ionic coordination, whereas PE fibers rely solely on physical friction and tend to be pulled out from the cement matrix rather than fracturing. Moreover, the internal fiber network plays a dual role in regulating the strength-ductility balance of fiber-reinforced cementitious composites. At the same fiber volume fraction, the smaller diameter and larger filament number of PE fibers result in a denser fiber network, which improves tensile ductility and multiple-cracking behavior but also increases entrapped air voids and reduces compressive strength. When the matrix composition changed from SF0-LS40 to SF20-LS20, the compressive strength and ultimate tensile strain of the PE-reinforced composite increased from 57.04 MPa to 2.49% to 114.54 MPa and 3.90%, respectively, whereas the PVA-reinforced composite showed an increase in compressive strength from 66.35 to 100.58 MPa but a decrease in ultimate tensile strain from 0.61% to 0.22%. The change in matrix composition effectively densifies the matrix and mitigates fiber-induced porosity, with a more pronounced strengthening response in the PE-reinforced system. These results demonstrate that the effectiveness of matrix modification is strongly dependent on the fiber-network structure and fiber-matrix interfacial characteristics, providing a theoretical basis for the coordinated design of the strength-ductility balance in UHDCC.","PeriodicalId":15064,"journal":{"name":"Journal of building engineering","volume":"180 1","pages":"117457"},"PeriodicalIF":6.4,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149123841","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}