Construction and Building Materials最新文献

{"title":"Versatile novel engineered polyamine/CaAl2Si2O8 nanocontainers manifesting anti-corrosion, mechanical, self-healing, chemical and UV immovability for external aliphatic acrylic polyurethane coating applied on steel petroleum and industrial tanks","authors":"A.M. Fadl ,&nbsp;M.I. Abdou ,&nbsp;N.H. Abotaleb ,&nbsp;S. El-Sherbiny ,&nbsp;M. Samir","doi":"10.1016/j.conbuildmat.2025.144148","DOIUrl":"10.1016/j.conbuildmat.2025.144148","url":null,"abstract":"<div><div>Recently, the incorporation of nanocomposites in polyurethane coating layers used to protect steel petroleum and industrial tanks has proven to play a vital role in raising their various resistance properties and enhancing their workability. For affirming this motif, amorphous silica nanoparticles (ASNPs, CaAl₂Si₂O₈) were synthesized by thermal fusion/quick quenching/solid phase milling sequential processes and commingled with cycloaliphatic/aromatic polyamine admixture to fabricate APN (AS/PA) nanocontainers acting as a versatile modifier for the external aliphatic acrylic polyurethane (AAPU) coating. XRD examination confirmed the amorphous shape of ASNPs and its quantitative chemical composition was demonstrated using the EDX technique. Measurements using TEM, SEM, and DLS allowed ASNPs to be characterized. Using the weight loss method and the salt spray accelerated corrosion test, the corrosion mitigation behavior of surface-modified APN polyurethane-coated films was compared to unmodified conventional PU. APN/PU-5 coating offered the least corrosion rate (CR) value at 0.00031 mm/y and exhibited the highest protection efficiency (PE) at 99.90 %. SEM and EDX surface morphological studies emphasized that the APN/PU-5-coated layer offered the best corrosion mitigation performance, revealing self-healing behavior. The electrochemical behavior was performed using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopic (EIS) measurements and affirmed the corrosion guard properties of the modified coatings in 5 % NaCl aggressive solution. The chemical resistance was investigated by acid and alkali spot tests to show the effect of incorporating the APN modifier on the chemical and physical degradations of coating layers. The mechanical durability for the various coatings was investigated by abrasion resistance, pull-off and cross-cut adhesions, direct versus indirect impacts, and bend flexibility methodology for demonstrating their workability and firmness. Consequently, UV immovability testing was conducted on the examined PU-coated films utilizing UV irradiation. The obtained results illustrated the superior UV resistance characteristics of the APN/PU-5 coating, in which APN modifier behave as UV absorber material. The presented results affirmed the versatile properties of APN/PU hybrid nanocomposite coating.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144148"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361209","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 bending creep behavior of long bamboo fiber/nano-alumina/epoxy ternary composites","authors":"Xiaxing Zhou ,&nbsp;Peiyuan Zhang ,&nbsp;Shaobin Zhan ,&nbsp;Ting Yu ,&nbsp;Lihui Chen ,&nbsp;Yanying Xiong ,&nbsp;Liulian Huang","doi":"10.1016/j.conbuildmat.2025.144183","DOIUrl":"10.1016/j.conbuildmat.2025.144183","url":null,"abstract":"<div><div>Bamboo fiber (BF) reinforced composites are attractive for sustainable engineering, yet their performance is hindered by weak fiber-matrix adhesion, the brittleness of the epoxy, and pronounced creep under warm and humid conditions. This study reported the synergistic strengthening and toughening achieved by impregnating long bamboo fibers with a polydopamine (PDA) primer that immobilized 20 nm alumina (Al₂O₃) nanoparticles (3 wt%) prior to epoxy infusion. The engineered interphase raised flexural strength, modulus, and impact toughness to 161.92 MPa, 9897.73 MPa, and 26.35 kJ/m², gains of 23.5 %, 22.2 %, and 20.1 %, respectively; while the glass transition temperature rose from 58.1 ◦C to 67.3 ◦C. Short-term flexural-creep tests (120 min) conducted at three stress levels (25 %, 50 %, and 75 %), temperatures (25 ◦C, 50 ◦C, and 75 ◦C) and relative humidities (25 %, 50 %, and 75 %) revealed markedly improved creep resistance, as evidenced by lower deflection, higher creep modulus and extended endurance. Stress exerted the dominant influence, followed by temperature, and then humidity, whose combined action accelerated creep and fracture. A six-parameter viscoelastic model captured the creep response more accurately than the classical four-element model. These findings provide a quantitative basis for predicting service life and designing reliable bamboo-fiber composites in structural applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144183"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361205","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":"Solidification behaviour of soluble Mn in blended cement with metallurgical slag","authors":"Qiang Liu ,&nbsp;Guangye Tu ,&nbsp;Meng Wu ,&nbsp;Guodong Xu ,&nbsp;Jianming Gao ,&nbsp;Yunsheng Zhang ,&nbsp;Cheng Liu","doi":"10.1016/j.conbuildmat.2025.144192","DOIUrl":"10.1016/j.conbuildmat.2025.144192","url":null,"abstract":"<div><div>The utilization of metallurgical slag for the partial substitution of clinker to produce blended cement is an effective approach for the harmless and resourceful disposal of industrial solid waste. Nevertheless, the influence of metallurgical slag on the solidification behavior between clinker minerals and heavy metals remains unclear in blended cement. In this study, the blended cement is composed of cement, synthetic amorphous phase (eliminating the influence of physical-chemical characteristics of different metallurgical slags), and different levels soluble Mn. The study applied various characterization methods focusing on the solidification behaviour of Mn in the hydration process of blended cement. The results reveal that Mn exhibits a dual effect on the reaction of C₃S, with the appearance time of the main peak in the hydration heat curve extending from 10 h to 17 h (when Mn dosage reaches 0.9 wt%). However, with the increase of Mn, the main peak appeared early at 5.6 h. The primary inhibitory factor for the C₃S hydration reaction is Mn-bearing hydrate phases on the surfaces of cement particles. However, when the soluble Mn content exceeds a certain threshold (2.7 wt% in this study), the clinker reaction is enhanced due to the formation of additional nucleation sites by Mn-hydrate precipitates. Mn is predominantly solidified within the gel-like hydration products and ettringite through lattice confinement and physical encapsulation. The introduction of Mn promotes the formation of ettringite-like products. This reaction consumes gypsum and thus accelerates the secondary hydration of C₃A. The improved hydration kinetics model is employed to reveal the hydration mechanism of blended cement containing Mn. The hydration process of blended cement follows a diffusion-controlled behaviour, which is influenced by the Mn-precipitation layer. These findings provide comprehensive insights into reaction kinetics and the solidification of heavy metals, contributing to the sustainable application of metallurgical slag in the environment.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144192"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361210","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 the superiority of biomass ash composite activation in blast furnace slag-coal gangue-fly ash system: A novel high-strength alkali-activated cementitious material","authors":"Zhiheng Wang ,&nbsp;Bing Wei ,&nbsp;Feng Liu ,&nbsp;Zhijing Zhu ,&nbsp;Feng Yang ,&nbsp;Shichao Zhao ,&nbsp;Rentai Liu ,&nbsp;Chenyang Ma","doi":"10.1016/j.conbuildmat.2025.144147","DOIUrl":"10.1016/j.conbuildmat.2025.144147","url":null,"abstract":"<div><div>Alkali-activated materials are excellent alternatives to ordinary Portland cement, and their comprehensive performance and environmental impact are closely related to the type of alkali activator. In this study, blast furnace slag (BFS), coal gangue (CG), and fly ash (FA) were used as precursors for alkali-activated materials. Based on macroscopic performance tests and microscopic characterization methods, a comprehensive evaluation was conducted on the activation efficiency and performance advantages/disadvantages of four alkali activators (sodium hydroxide solution, modified sodium silicate solution, biomass ash (BA) solution, and composite alkali activator) in the BFS-CG-FA ternary solid waste system. This study introduced a novel BA composite activation method, which combines modified sodium silicate solution with potassium-rich and calcium-rich BA. The resulting alkali-activated cementitious material exhibited high strength, with a 28d compressive strength of 48.75 MPa. The results showed that, for the BFS-CG-FA system, BA composite activation exhibited excellent activation efficiency both in the early and late stages of the reaction. Moreover, BA more significantly enhanced the activation efficiency of low-concentration sodium silicate solution. The addition of BA not only enabled the material to achieve higher 28d compressive strength but also significantly increased the 1d compressive strength by 66 times (32.21 MPa vs. 0.48 MPa), greatly improving the early strength of the cementitious material. The findings of this study are conducive to promoting the research and development of environmentally friendly alkali activators as well as the popularization and engineering application of high-performance alkali-activated materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144147"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361367","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 and analytical investigation of fracture behavior in GFRP reinforced seawater sea-sand HVFA-SCC beams","authors":"Lingzhu Zhou ,&nbsp;Linsheng Huo ,&nbsp;Yu Zheng ,&nbsp;Yong Yu ,&nbsp;Wen Sun ,&nbsp;Yuxiao Ye","doi":"10.1016/j.conbuildmat.2025.144123","DOIUrl":"10.1016/j.conbuildmat.2025.144123","url":null,"abstract":"<div><div>The high energy consumption and carbon emissions of cement, shortages of freshwater and river-sand resources, and steel reinforcement corrosion are major challenges in construction. To address these issues, the combination of seawater sea-sand (SWSS), high-volume fly ash self-compacting concrete (HVFA-SCC), and glass fiber reinforced polymer (GFRP) reinforcement has been introduced for engineering construction. However, the fracture behavior of GFRP reinforced seawater sea-sand HVFA-SCC (SWSS-HVFA-SCC) beams under three-point bending has rarely been studied. Therefore, this study conducts an experimental and analytical investigation on such beams to explore their fracture characteristics, fracture process, and failure mechanisms. The effects of reinforcement type, initial crack-depth ratio, concrete cover thickness, reinforcement diameter (reinforcement ratio), and concrete type on the fracture behavior of these beams are discussed. A four-stage fracture failure model, including the linear elastic, micro-crack propagation, macro-crack propagation, and unstability failure stages, for FRP reinforced concrete beams is established. The microscopic and macroscopic fracture toughness are introduced to characterize the crack propagation state of FRP reinforced concrete structures under the service limit state. A crack propagation criterion and a method for calculating fracture parameters are also proposed. The results indicate that for an initial crack-depth ratio of 0.4 or less, both the microscopic and macroscopic fracture toughness remain nearly constant. They can thus be regarded as material parameters for GFRP reinforced SWSS-HVFA-SCC specimens. Furthermore, the analytical methods for modeling the fracture process of GFRP reinforced SWSS-HVFA-SCC beams are proposed using both a tri-linear bond-slip model and a dual-<span><math><mi>α</mi></math></span> bond-slip model. The load-<em>CMOD</em> curves obtained from the proposed analytical methods for GFRP reinforced SWSS-HVFA-SCC beams show high consistency with the experimental results.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144123"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361279","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":"Enhanced waterproofing of phosphogypsum-based foamed concrete via long-chain alkyl-modified poly(methylhydrosiloxane): Synthesis, characterization, and performance evaluation","authors":"Wei Wang ,&nbsp;Zhongyu Su ,&nbsp;Ruohan Shi ,&nbsp;Mengyao Qi ,&nbsp;Yukun Huang ,&nbsp;Weijun Peng ,&nbsp;Yijun Cao","doi":"10.1016/j.conbuildmat.2025.144178","DOIUrl":"10.1016/j.conbuildmat.2025.144178","url":null,"abstract":"<div><div>Phosphogypsum (PG), a major industrial by-product of phosphoric acid production, presents significant environmental challenges due to its low utilization rate and poor water resistance when used in construction materials. In this study, a novel long-chain alkyl-modified poly(methylhydrosiloxane) (L-PMHS) was synthesized via hydrosilylation to enhance the waterproof performance of PG-based foamed concrete. Under the optimal conditions (80 °C, 10 mg/L catalyst, 1:1.4 molar ratio, and 4 h), the modified L-PMHS exhibited significantly improved hydrophobicity and viscosity balance. Comprehensive characterization using FTIR, ¹H NMR, XRD, and XPS confirmed the successful grafting of long-chain alkyl groups onto the siloxane backbone and the formation of a hydrophobic barrier on PG surfaces. Compared to unmodified PMHS, L-PMHS achieved a greater reduction in water absorption (down to 5.03 %) at a much lower dosage (10 %), without significantly compromising compressive strength. Surface chemical analysis revealed enhanced C–H and C–C bonding, reduced surface hydroxyl content, and inhibited hydration reactions—indicating that the waterproofing mechanism was dominated by effective surface shielding and molecular-level hydrophobic enrichment. This work provides a cost-efficient and scalable strategy for improving the durability and performance of PG-based construction materials. The use of structurally tailored organosilicon hydrophobes offers new insights into the design of high-performance, water-resistant building composites derived from industrial solid wastes.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144178"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361462","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 the compression mechanical property of PVC pipe confined recycled aggregate concrete under impact load","authors":"Chunyang Liu ,&nbsp;Enze Liu ,&nbsp;Aoran Bao ,&nbsp;Abudureyimujiang Aosimanjiang","doi":"10.1016/j.conbuildmat.2025.144154","DOIUrl":"10.1016/j.conbuildmat.2025.144154","url":null,"abstract":"<div><div>Investigating the damage characteristics and variation laws of mechanical properties of PVC-confined Recycled Aggregate Concrete (RAC) under dynamic impact loading is essential for ensuring the safety of RAC structural design. This study employs polyvinyl chloride (PVC) pipes as confining materials. Through quasi-static compression tests and Φ75 mm split hopkinson pressure bar (SHPB) dynamic impact tests, the influence of different recycled coarse aggregate replacement rates (0 %, 100 %) and PVC confinement on the uniaxial compression dynamic mechanical properties of RAC was investigated within the strain rate range of 50–120 s⁻¹. The results showed that PVC confinement can effectively enhance the impact resistance and energy dissipation capacity of RAC specimens, with a more pronounced effect observed for specimens with a 100 % replacement ratio. The dynamic compressive strength of RAC specimens exhibited a clear strain rate strengthening effect. PVC confinement enhanced this strengthening effect but reduced the strain rate sensitivity of the dynamic increase factor (DIF). A modified Weibull model incorporating strain rate and replacement rate parameters was able to accurately predict the dynamic strength distribution, with an average error of only 1.47 %. Additionally, the fractal dimension was found to qualitatively characterize the failure evolution trend and severity of RAC specimens. By quantitatively analyzing the correlation between Fractal Characteristics of Fragmentation and mechanical performance, a more comprehensive material evaluation can be achieved.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144154"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361278","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":"Bio-based intumescent flame retardant for fire-safe and mechanically enhanced rigid polyurethane foams","authors":"Jiatao Cao,&nbsp;Nanlan Shen,&nbsp;Chengshu Yan,&nbsp;Yun Zhao,&nbsp;Chuanbai Yu,&nbsp;Shuai He,&nbsp;Zhenfeng Huang,&nbsp;Wenhui Rao","doi":"10.1016/j.conbuildmat.2025.144142","DOIUrl":"10.1016/j.conbuildmat.2025.144142","url":null,"abstract":"<div><div>Rigid polyurethane foams (RPUFs) have attracted increasing interest in the construction sector due to their lightweight nature and excellent thermal insulation properties. However, their intrinsic flammability significantly restricts their potential applications across various fields. In this study, a bio-based intumescent flame retardant (LP) was synthesized by integrating phytic acid, melamine, and lignin into a single macromolecular structure. The abundant hydroxyl and amine groups in LP establishes remarkable reactivity with isocyanate groups, thereby promoting homogeneous dispersion within the polyurethane matrix. Remarkably, the RPUF/5 %LP composite exhibited a significant 64 % enhancement in longitudinal compressive strength (317.2 kPa) compared to neat RPUF (193.6 kPa). Furthermore, in contrast to neat RPUF, the fire safety of RPUF/LP composites were significantly enhanced. Specifically, the RPUF/10 %LP composite achieved a high LOI value of 24.5 %, a 15.7 % diminution in peak of heat release rate, and a 20.1 % diminution in total smoke production. When LP incorporated with high-expansion-ratio expandable graphite (EG) into RPUF, the flame retardancy of the resulting composites was further enhanced. These findings highlight the feasibility of using renewable bio-based additives to develop high-performance, environmentally friendly flame-retardant foams for construction and building applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144142"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361463","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":"Effects of clogging on void characteristics and sound absorption properties of porous asphalt pavements","authors":"Jia Guo ,&nbsp;Ouming Xu ,&nbsp;Yuyang Zhao ,&nbsp;Shunlin Xiang ,&nbsp;Sen Han","doi":"10.1016/j.conbuildmat.2025.144155","DOIUrl":"10.1016/j.conbuildmat.2025.144155","url":null,"abstract":"<div><div>Porous asphalt (PA) features a high void content with abundant connected voids that enable effective drainage and noise reduction. However, the internal voids may become clogged by external substances over time, resulting in a decline in noise reduction capability. This study systematically investigated the effects of target void content, clogging material, and clogging cycles on void characteristics and sound absorption performance. The methodology included material design, clogging simulation, CT scanning, and acoustic testing. Results show that void content was the primary factor affecting the initial sound absorption performance of PA-13. Specimens with a target void content of 25 % achieved an average sound absorption coefficient of 0.487 within the 500–1250 Hz frequency range. However, higher void content also increased susceptibility to clogging. Differences in gradation and density among clogging materials caused heterogeneous changed in void structure. Rubber powder predominantly accumulated in the top section of specimens, causing the highest sound absorption attenuation. In contrast, sand particles mainly clogged mid-sized voids while preserving partial connectivity. This led to a more gradual decline in sound absorption coefficient. The 630–2000 Hz frequency band consistently showed the highest absorption level, demonstrating it as the most significant range for PA-13 pavement acoustic performance. Grey correlation analysis identified clogging cycles and target void content as the dominant factors affecting sound absorption attenuation. Frequency response analysis further revealed that sound absorption efficiency in the 630–2000 Hz range was highly sensitive to void connectivity. Future research should explore the long-term relationship between void structure evolution and acoustic performance under sustained clogging conditions.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144155"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361204","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 study of size effect on strain rate sensitivity of concrete-filled steel tubes","authors":"Wenhao Zhao ,&nbsp;Zhong-Xian Li ,&nbsp;Jian Cui ,&nbsp;Yanchao Shi ,&nbsp;Yang Ding","doi":"10.1016/j.conbuildmat.2025.144133","DOIUrl":"10.1016/j.conbuildmat.2025.144133","url":null,"abstract":"<div><div>In recent years, concrete-filled steel tubular (CFST) structures have been commonly used in large-scale engineering projects. In such structures, the members are often of considerable size, however, the experimental study primarily focused on small-scale specimens due to limitations in the loading facilities. The size effect on the static and dynamic properties of CFST remains unclear. This study systematically investigates the influence of size effects on the strain rate sensitivity of CFSTs through quasi-static and Split Hopkinson Pressure Bar (SHPB) dynamic tests. Plain concrete specimens and CFST specimens with diameters of 35 mm, 50 mm, and 70 mm are used to characterize their size effect. The results reveal that under quasi-static loading, both plain concrete and CFST exhibit a distinct size effect, with the compressive strength decreasing as the diameter of specimens increases from 35 mm to 70 mm. However, under high strain rate loading, plain concrete exhibits higher strength with larger specimen size. In contrast, the compressive strength of CFST specimens shows minimal size dependence under dynamic loading. This difference is attributed to the radial inertial effect, which significantly enhances the apparent strength of plain concrete under dynamic conditions but is less pronounced in CFST specimens due to the confinement provided by the steel tube. Furthermore, the study decouples the pure strain rate effect and the radial inertial effect of the concrete material. These findings provide more accurate material strength for designing CFST structures against extreme dynamic loads.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"500 ","pages":"Article 144133"},"PeriodicalIF":8.0,"publicationDate":"2025-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145361468","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}