Construction and Building Materials最新文献

{"title":"Fracture behavior and multiple toughening mechanisms of low-Ni, low-Mn weathering bridge steel at low temperature based on crystallographic characteristics","authors":"Wang Li ,&nbsp;Xiuhua Gao ,&nbsp;Hongyan Wang ,&nbsp;Changyou Zhu ,&nbsp;Chang Liu ,&nbsp;Shuo Gao ,&nbsp;Tong Li ,&nbsp;Xincheng Chen ,&nbsp;Zhiwei Liu ,&nbsp;Fan Wang ,&nbsp;Hongyan Wu ,&nbsp;Linxiu Du ,&nbsp;Cairu Gao","doi":"10.1016/j.conbuildmat.2025.144878","DOIUrl":"10.1016/j.conbuildmat.2025.144878","url":null,"abstract":"<div><div>The intrinsic relationships among the crystallographic characteristics, plastic deformation, and low-temperature fracture toughness of a low-Ni, low-Mn weathering bridge steel were investigated in this study. The evolution of grain boundary characteristics, crystallographic orientations, and textures during low-temperature quasi-static fracture was characterized using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). In addition, the fracture and toughening mechanisms were comprehensively elucidated from a microstructural perspective. Results indicated that the <em>J</em>_0.2BL value of the weathering bridge steel at −40 °C reached 1027.94 kJ/m². This superior low-temperature fracture toughness is primarily attributed to multiple toughening mechanisms involving the synergistic effects of both intrinsic and extrinsic contributions. The intrinsic toughening mechanism arises from the coordinated deformation of the multiphase microstructure and the adaptive evolution of crystallographic texture. The increased plastic deformability within the crack-tip plastic zone facilitates deformation-induced grain refinement, thereby elevating the cleavage fracture stress. Extrinsic toughening is manifested through crack deflection jointly governed by high-angle grain boundaries (HAGBs) and crystallographic orientation. HAGBs and low-Schmid factor (SF) grains with large twist angles promote significant crack deflections during crack propagation. The repeated deflection of the crack substantially increases the energy dissipated during fracture, thereby inhibiting rapid crack growth.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144878"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788861","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 effects of particle shape and size distributions on the maximum shear modulus of granular materials: A DEM-based investigation","authors":"Xingyang Liu ,&nbsp;Jiaqi Yang ,&nbsp;Jian Gong ,&nbsp;Linsong Sun ,&nbsp;Xingliang Wang","doi":"10.1016/j.conbuildmat.2025.144857","DOIUrl":"10.1016/j.conbuildmat.2025.144857","url":null,"abstract":"<div><div>The maximum shear modulus (<em>G</em>ₘₐₓ) is a crucial mechanical property of soils. However, the influence of particle shape on the <em>G</em>ₘₐₓ is not yet fully understood, particularly in granular systems comprising a mix of different particle shapes. This study comprehensively investigates the joint influence of particle shape distribution and particle size distribution on the <em>G</em>ₘₐₓ of granular soils through discrete element method (DEM) simulations. Two series of simulations were conducted: the first series examined the effect of particle shape and fines content (<em>FC</em>) under a fixed coarse-fine particle size ratio (<em>R</em>_d), while the second series analyzed the influence of particle shape distribution and <em>R</em>_d with a fixed <em>FC</em> of 20 %. The results of Series 1 indicate that, for granular system composed of particles with a certain shape, increasing particle irregularity increases <em>G</em>ₘₐₓ whereas increasing <em>FC</em> decreases <em>G</em>ₘₐₓ. The mechanical void ratio (<em>e</em>ₘ) correlates strongly with <em>G</em>ₘₐₓ across different <em>FC</em> levels. However, particle-shape effects on the <em>G</em>_max are not fully captured by <em>e</em>_m, as the proportion of rattlers decreases with increasing particle irregularity. The results of Series 2 indicate that spherical small particles exert a stronger lubricating effect between large particles compared to irregular small particles. Overall, specimens with irregular large and irregular small particles, as well as specimens with irregular large and spherical small particles, exhibit higher <em>G</em>ₘₐₓ values than specimens with spherical large and spherical small particles, or specimens with spherical large and irregular small particles. However, this trend may exhibit variations depending on <em>R</em>_d and particle shape. These variations can be attributed to the distinct contributions of contact types (i.e., coarse-coarse, coarse-fine, and fine-fine) in terms of both their number and the force transmission characteristics across various particle shape distribution configurations. Finally, we introduce a modified void ratio that accounts for both unstable and inactive particles, thereby quantitatively normalizing the effects of particle size and shape distributions on the <em>G</em>ₘₐₓ.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144857"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735822","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":"Blast resistance of ultra-high performance concrete slabs with multi-layer BFRP grids: Insights from experiments and numerical simulation","authors":"Dujian Zou ,&nbsp;Zichao Que ,&nbsp;Manyi Zhou ,&nbsp;Shanshan Qin ,&nbsp;Zhongzhen Wang ,&nbsp;Tiejun Liu ,&nbsp;Zhilin Bai ,&nbsp;Kexuan Li ,&nbsp;Hanxiong Lyu","doi":"10.1016/j.conbuildmat.2025.144848","DOIUrl":"10.1016/j.conbuildmat.2025.144848","url":null,"abstract":"<div><div>Combining fiber reinforced polymer (FRP) grid and ultra-high performance concrete (UHPC) offers a promising approach for developing cement-based composite materials for blast resistance. However, the effectiveness of different slab thicknesses and FRP grid configurations in dissipating energy under contact explosions remains uncertain. This study addressed the uncertainty by systematically exploring the role of multi-layer BFRP grids in enhancing the blast resistance of UHPC slabs. Experimental results indicated that BFRP grids reduced the crater and spall dimensions of the slabs under contact explosions and provided an additional path for blast energy dissipation. LS-DYNA was employed to simulate the damage modes, energy evolution, and destruction process of slabs with various parameters. The increasing slab thickness changed the damage modes from perforation to cratering and spalling. Adding grid layers helped redistribute tensile stresses and inhibit crack propagation on the rear surfaces. Moreover, the rotated grid configurations can make more grids participate in energy dissipation, leading to a significant increase in the internal energy of grids when the rotation angle changes from 0 to 45°. The findings clarify how design parameters govern the anti-blast performance of BFRP grid-reinforced UHPC slabs.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144848"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735851","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":"Component-activating redesign of cold patch asphalt mixture towards humidity adaptability: Performance evaluation, structure characterization, and mechanism analysis","authors":"Nannan Yang ,&nbsp;Jianying Yu ,&nbsp;Xiong Xu ,&nbsp;Derun Zhang ,&nbsp;Rui Li ,&nbsp;Chao Peng ,&nbsp;Anand Sreeram ,&nbsp;Guoyang Lu","doi":"10.1016/j.conbuildmat.2025.144856","DOIUrl":"10.1016/j.conbuildmat.2025.144856","url":null,"abstract":"<div><div>Conventional cold patch asphalt mixtures (CPAMs), used for pothole repair, always exist some issues in engineering performance, particularly mechanical strength, humidity adaptability, and binder adhesion. To address these concerns, this study considered using solvent naphtha (SN) as diluent and polymeric methylene diphenyl diisocyanate (PMDI) as reactive chemical at different mixing proportions, in combination with virgin bitumen, to optimally prepare highly active cold patch asphalt liquids (CPALs) for improving the overall performance of CPAMs. Based on this, the moisture-cured Marshall performance, indirect tensile fatigue resistance, as well as aging resistance of CPAMs, and the adhesion, phase structure, and molecular structure of CPALs, were systematically evaluated by a series of tests for the performance-enhancing mechanism analysis. The results demonstrated that the suitable incorporation of PMDI into CPAL can not only benefit to compensate the strength deficiency of SN-based CPAM, even under the moisture conditions, reaching mostly at 15.6 kN in Marshall load after 48 h, but also significantly extend the fatigue life, improve the aging resistance with a remaining Marshall load of 9.5 kN, at a SN-to-PMDI ratio of 50:50. Furthermore, the adhesion of asphalt binder to aggregates was enhanced after introducing PMDI, with a binder mass loss decreased from 17.31 % to 12.24 %. In addition, PMDI can suppress the agglomeration of SN in CPAL to achieve more uniform distributions, which can provide –NCO groups to react with gaseous water and –OH groups from aggregates to enhance the binder adhesion and mixture performance during mixing and after paving. Overall, the proposed approach can provide a promising solution to address the long-term application concern of CPAM in pothole repairing.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144856"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735901","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":"The integrity of historic fibrous plaster ceilings under dynamic loading","authors":"Barrie Dams ,&nbsp;Alexander J.G. Lunt ,&nbsp;Xinyi Kong ,&nbsp;Jamie Wilson ,&nbsp;Shivansh Nauriyal ,&nbsp;Martin P. Ansell ,&nbsp;Marion Harney ,&nbsp;John Stewart ,&nbsp;Richard J. Ball","doi":"10.1016/j.conbuildmat.2025.144852","DOIUrl":"10.1016/j.conbuildmat.2025.144852","url":null,"abstract":"<div><div>The collapse of the Apollo theatre ceiling, London, 2013, emphasised the importance of researching historic fibrous plaster ceilings. Ceilings are subject to dynamic forces, and this study identifies and quantifies dynamic loads in historic theatre ceilings by in-situ monitoring using accelerometers. Flexural, tensile and compressive tests were conducted on new and historic fibrous plaster to establish properties of ceiling panels and supporting fibrous plaster wads. Forces required to initiate microcracks and ultimate failure were compared with the magnitude of recorded accelerations. In-situ work made two important discoveries: technical activity in-between shows induces higher accelerations than performance sound pressure levels, and steel wire rope (supporting light/sound systems) making contact with ‘top hats’ (tubular channels in cylindrical drilled ceiling holes) is the primary dynamic loading in routine operation, with acceleration peaks typically ≈ 15 g (≈35 N force). Simulating accelerations in ceiling-panel laboratory tests resulted in displacements up to 0.1 mm and 200 microstrain. Results in new fibrous plaster established forces and displacements when initial microcracks occur in flexure (≈700 microstrain), tension (≈7000 microstrain) and compression (≈10000 microstrain). Results demonstrated that accelerations recorded in-situ would be insufficient to cause cracks in new, or well-maintained historic, theatre ceilings and wads. Ceilings in different buildings may vary in condition, therefore minimising steel wire rope-top hat contact would reduce the probability of ceilings sustaining damage. This study provides the first quantitative evidence of the dynamic behaviour and material performance of original wads and theatre ceilings, transforming understanding of their properties. Results will directly guide conservation policy and practice, enabling heritage engineers, conservation professionals, custodians and building owners, to make evidence-based decisions that enhance the long-term safety and preservation of historic interiors.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144852"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788942","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":"Influence of mandrel diameter and aging on damage propagation in bent steel bars: DIC-based experimental study and predictive modeling","authors":"Yulong Zheng,&nbsp;Yibo Guo,&nbsp;Jingyi Shao,&nbsp;Yutao Sun,&nbsp;Jingquan Wang","doi":"10.1016/j.conbuildmat.2025.144876","DOIUrl":"10.1016/j.conbuildmat.2025.144876","url":null,"abstract":"<div><div>Bent steel bar, particularly stirrups, plays a critical role in concrete structures by providing shear resistance and confining core concrete. However, nonstandard bending processes induce initial damage at stirrup rib roots, which may propagate under the stresses, including seismic longitudinal loading and diseased concrete expansion, leading to premature brittle fractures. Nevertheless, systematic investigations into these fracture mechanisms remain scarce. This study combines digital image correlation (DIC) with mechanical testing to examine initial damage formation, propagation, and the mechanism of strength degradation in bent steel bars, considering bending mandrel diameter (<em>D</em>), angle variation (<em>X</em>), and aging effects. For <em>D</em>= 2<em>φ</em> (<em>φ</em> as rebar diameter), the initial crack reached 430μm at 90° bending, 2.26 times of 4<em>φ</em> (190μm). Following 30-year strain aging and tensile testing, the strength retention ratio (<em>ξ</em>_<em>1</em>) of <em>D</em>= 2<em>φ</em> drastically decreased to 35 % (222.3 MPa). Further, corresponding specimens exhibited rapid damage propagation, resulting in premature brittle fracture within the 17°–19° angle opening. In contrast, <em>D</em>= 4<em>φ</em> maintained <em>ξ</em>_<em>1</em> above 93 %, without premature fracture. Furthermore, non-aged <em>D=</em> 2<em>φ</em> showed localized strain concentration at rib roots (0.76<em>ε</em>). While strain exceeding 2<em>ε</em> after 30-year aging treatment, a 1.63-fold increase. Finally, referring to traditional fracture mechanics and fatigue damage theory, the crack propagation model of bent steel bars under static tensile loading is proposed. The model demonstrates strong agreement with experimental results, generally maintaining prediction errors within ±20 %. These findings provide valuable theoretical and empirical support for the ribbed steel bar bending process, as well as enhancing durability design and seismic performance assessment of concrete structures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144876"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735850","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":"Signal transmission performance and mechanism of smart aggregate developed from carbon mineralization in concrete","authors":"Zhiyong Zhu ,&nbsp;Huanghuang Huang ,&nbsp;Zhichao Liu ,&nbsp;Haowen Ding ,&nbsp;Fazhou Wang ,&nbsp;Zuhua Zhang","doi":"10.1016/j.conbuildmat.2025.144871","DOIUrl":"10.1016/j.conbuildmat.2025.144871","url":null,"abstract":"<div><div>The passive and wireless smart aggregate developed from radio frequency and γ-C₂S carbonation technology enables lifespan traceability and digital management of concrete structure, while its signal transmission performance and the underlying mechanism remain unclear. Here the influences of concrete thickness, curing age, and curing regime on signal transmission distance of smart aggregate were investigated. It was found that the flexural strength of smart aggregate after 2-h carbonation reached 32.9 MPa. The signal transmission distance decreased with the increase of covered concrete thickness, while increased with the extension of concrete curing age. The maximum signal transmission distance of smart aggregate reached 8.5 m after 28-d standard curing of concrete. Moreover, steam curing of concrete was shown to reduce the signal transmission distance of smart aggregate by a maximum rate of 20 %. The smart aggregate was successfully applied to the manufacturing of 434 prefabricated concrete pipe piles to enable the whole-process management and life-cycle traceability. In addition, smart aggregates can be used to increase the efficiency of inventory management, including inventory check and in-and-out automatic counting given their in-quantity identification ability.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144871"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735904","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 enhancement of hydrophobic stability in superhydrophobic cement mortar by modified nano-SiO₂ and silane","authors":"Tianlun Wan,&nbsp;Guojun Ke ,&nbsp;Dan Jin,&nbsp;Yicheng Deng,&nbsp;Haihao Wang,&nbsp;Yihan Wang","doi":"10.1016/j.conbuildmat.2025.144869","DOIUrl":"10.1016/j.conbuildmat.2025.144869","url":null,"abstract":"<div><div>Cement-based materials are prone to forming local weak zones because hydrophobicity is distributed non-uniformly, which compromises durability and service performance. To address this, γ-aminopropyltriethoxysilane (KH550) was used to modify nano-silica (NS), yielding highly dispersible modified nano-silica (MNS), which was co-incorporated with isobutyltriethoxysilane (IBTES) to produce an integrally superhydrophobic cement mortar. In this study, the addition levels of MNS and IBTES are 0–3 wt% and 0–6 wt%, respectively, by mass of cement. All of the tests were carried out after 28 days of standard curing. The dispersion behavior of MNS and its distribution within the mortar were systematically characterized. Combined with measurements of water contact angle, capillary water absorption, and immersion water absorption, these evaluations elucidated the synergistic mechanism by which MNS and IBTES enhance hydrophobicity. The results showed that KH550 modification markedly improved the dispersion stability of NS. The water contact angle of mortar containing 2 wt% MNS plus 5 wt% IBTES is154.4° The capillary water absorption coefficient and immersion water absorption of the mortar incorporating optimal dosages of MNS and IBTES decreased by 77.2 % and 85.1 %, respectively, in comparison to the reference mortar. Microstructural analysis revealed that MNS uniformly distributed within the matrix, and the synergistic effect of it with IBTES favors the formation of a dense and rough surface, which is consistent with the Cassie–Baxter model. This strategy effectively improved the uniformity and stability of hydrophobicity throughout the material, providing a promising route for the superhydrophobic modification of cement-based materials and strong potential for engineering applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144869"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735903","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":"Innovative production of sustainable engineered geopolymer composites using ceramic powder and magnetized water","authors":"Khalid A. Eltawil ,&nbsp;Mostafa M. Keshta ,&nbsp;Mohamed M. Yousry Elshikh ,&nbsp;Osama Youssf","doi":"10.1016/j.conbuildmat.2025.144845","DOIUrl":"10.1016/j.conbuildmat.2025.144845","url":null,"abstract":"<div><div>The building sector is progressively utilizing sustainable materials to mitigate environmental effect and enhance structural performance. This study investigates the application of ceramic powder (CP) and magnetized water (MW) in the production of engineered geopolymer composites (EGC) as sustainable substitutes for conventional ingredients namely; fly ash (FA), ground granulated blast-furnace slag (GGBFS), and tap water (TW). CP was utilized at 20 %, 40 %, 60 %, and 80 % replacement ratios of FA and slag by volume, whereas MW substituted TW in preparing the alkaline activator of EGC. Four curing techniques were applied on the proposed sustainable EGC namely; tap water, seawater, air, and sunlight. The experimental measurements involved slump, compressive strength, flexural strength, uniaxial tensile strength, and water absorption. In addition, microstructural investigations were conducted including scanning electronic microscope (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The results indicated that using of 20 % CP in EGC could show compressive strength equivalent to the control mix (75–76 MPa at 90 days). Nevertheless, higher CP contents (40 % and above) diminished the compressive strength. The inclusion of MW significantly enhanced the workability and mechanical performance of EGC. Mixes made with MW achieved compressive strengths of up to 81 MPa after 90 days, representing 8 % increase compared to mixes prepared with TW. Microstructural investigations demonstrated a denser, more homogeneous matrix with less porosity and improved interfacial transition zones in EGC mixes made with CP and MW. The findings indicate that 20 % CP can serve as a sustainable binder in EGC, providing equivalent strength and enhanced durability. Furthermore, MW is a cost-efficient and environmentally sustainable option for improving EGC performance, positioning it as a viable material for sustainable construction.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144845"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788868","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":"Behaviors of FRP-interlayer-steel confined concrete columns under cyclic axial compression","authors":"Qing Hu ,&nbsp;Kun Wang ,&nbsp;Changyong Liu ,&nbsp;Daiyu Wang ,&nbsp;Yuyin Wang","doi":"10.1016/j.conbuildmat.2025.144837","DOIUrl":"10.1016/j.conbuildmat.2025.144837","url":null,"abstract":"<div><div>By bonding a fiber reinforced polymer (FRP) filament-wound tube to a concrete-filled steel tube (CFST) using grouting material, FRP-interlayer-steel confined concrete (FISC) columns are proposed to enhance the corrosion resistance and bearing capacity of CFSTs. While previous research has explored the behaviors and confinement mechanism of FISCs under monotonic axial compression, there is a lack of systematic experimental studies on their cyclic axial compressive behaviors. To address this gap, in this paper, a total of eighteen short specimens were tested under cyclic axial compression, including sixteen FISC specimens, one FRP confined concrete-filled steel tubular (CCFT) specimen, and one concrete-filled FRP tubular (CFFT) specimen. The characteristics of axial stress-strain envelope curves, unloading curves, and reloading curves for FISCs were examined and discussed, considering variations in loading schemes, FRP types, FRP thickness, concrete strength, and the ratio of FRP to steel confining indexes. The strain development in the steel and FRP tubes at the same mid-column section under different cyclic compression conditions was compared, indicating that the FRP strain was significantly lower due to the strain lag caused by the existence of the grouting material. Additionally, the relationship between plastic strain and unloading strain was established, highlighting the cumulative effects of loading history on plastic strain and stress degradation. Furthermore, by regarding the concrete and grouting material as a whole unity, cyclic stress-strain models for dual-confined concrete-grouting in FISCs were proposed, which demonstrated good agreement with experimental results.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"506 ","pages":"Article 144837"},"PeriodicalIF":8.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145735820","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}