Construction and Building Materials最新文献

{"title":"Optimal intensity measures and probabilistic fragility assessment for the long-span aqueduct structure with four-column bents","authors":"Min Du ,&nbsp;Xiaohong Yang ,&nbsp;Sherong Zhang ,&nbsp;Chao Wang ,&nbsp;Ran Guo ,&nbsp;Ji Yao ,&nbsp;Ze Li","doi":"10.1016/j.conbuildmat.2024.139100","DOIUrl":"10.1016/j.conbuildmat.2024.139100","url":null,"abstract":"<div><div>The intensity measure (<em>IM</em>) is a key factor in determining the accuracy of seismic performance assessment, which can represent the power of ground motion. However, the optimal <em>IM</em>s selection for long-span aqueduct structures with four-column bents has not been investigated in the previous study. This study aims to evaluate the optimal <em>IM</em>s for use in probabilistic seismic demand model (PSDM) and propose the scalar- and vector-valued fragility methods of the long-span aqueduct structure. To achieve this goal, taking the long-span aqueduct structure with four-column bents in the Central Yunnan Water Diversion Project in Southwest China as a typical case, a series of nonlinear dynamic time history analysis are conducted. Then, the 21 commonly-used <em>IM</em>s are tested and evaluated based on the different metrics (e.g. correlation, efficiency, practicality and proficiency). The optimal vector-valued <em>IM</em>s for the fragility analysis of the long-span aqueduct structure with four-column bents is proposed. Meanwhile, the PSDMs of optimal vector-valued <em>IM</em>s are also established and compared. Finally, the scalar- and vector-valued fragility functions are developed in terms of the optimal <em>IM</em>s. A method for seismic fragility analysis of the long-span aqueduct structure with four-column bents based on vector-valued <em>IM</em>s is proposed. The numerical results reveal that peak ground acceleration (<em>PGA</em>), peak pseudo acceleration spectrum (<em>PSA</em>), root-mean-square of acceleration (<em>A</em>_rms) and characteristic intensity (<em>I</em>_c) are relatively appropriate <em>IM</em>s for seismic performance evaluation of the long-span aqueduct structure with four-column bents. In particular, <em>PGA</em> is considered to be the optimal <em>IM</em> due to its highest correlation, better efficiency, practicality and proficiency. The scalar-valued fragility curves can only describe the impact of the single <em>IM</em> on the damage probability of the aqueduct structure, which may overestimate or underestimate its damage probability. Furthermore, the vector-valued <em>IM</em>s can significantly increase the fitting ability of the PSDMs. The fragility surfaces are superior to scalar-valued fragility curve due to the vector-valued <em>IM</em>s can more accurately describe the ground motion information. In summary, the findings of this study highlight the significance of proposing the optimal <em>IM</em>s and developing vector-valued fragility surfaces when evaluating the seismic performance of the long-span aqueduct structure with four-column bents.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139100"},"PeriodicalIF":7.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664187","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":"Aging behavior of polyether polyurethane binder: Thermal-oxidative, photo-oxidative, hydrolytic aging, and microscale","authors":"Qian Zhang ,&nbsp;Xiaoya Hu ,&nbsp;Hui Ma ,&nbsp;Wei Li ,&nbsp;Xiuqin Jin","doi":"10.1016/j.conbuildmat.2024.139077","DOIUrl":"10.1016/j.conbuildmat.2024.139077","url":null,"abstract":"<div><div>Polyurethane pavements exhibit excellent toughness and weather resistance; however, as a polymer binder, polyurethane (PU) is prone to aging under the influence of natural factors such as heat, oxygen, light, and water. To investigate the microscale aging behaviors during thermal-oxidative, photo-oxidative, and hydrolytic aging, two types of one-component polyether polyurethanes were selected. Based on infrared spectroscopy test, atomic force microscope test, tensile performance test, and dynamic mechanical analysis test, the changes in micro-composition and micro-structure were comprehensively analyzed, and these changes were correlated with the macroscopic mechanical properties. The results indicate that no new functional groups were formed in the two types of PU during the aging processes, although molecular chain breakage occurred. Among them, the effect of thermal-oxidative aging on C<img>O was obvious, while hydrolytic aging had a significant influence on C-H bond. After aging, the degree of hydrogen bonding increased, and microphase separation became more pronounced, variations of separation degree depending on the type of aging. Point aggregation of hard segments presented after the thermal-oxidative aging, while large area block or strip aggregation of hard segments was discovered after photo-oxidative aging. However, hard segments displayed fine-strip-aggregation and uniform dispersion in soft segments after the hydrolytic aging. A multidimensional radar chart composed of seven micro-factors revealed that chemical crosslinking dominated the polyurethane crosslinking, while physical crosslinking through hydrogen bonding between hard and soft segments was significantly enhanced. However, the strength of chemical crosslinking varied due to the residual isocyanate content in the original two types of PU. Correspondence analysis showed that the decline in tensile performance and the changes in DMA performance exhibited a high degree of consistency with microscale aging behaviors, indicating that the seven microscale factors can serve as systematic assessment indicators for formulating PU materials with enhanced anti-aging performance for pavement applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139077"},"PeriodicalIF":7.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664243","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":"Microstructural properties of alkali-activated mortars prepared from Fenton oxidation and heat-treated dyeing sludge as the substitutions of slag","authors":"Dongyang Tian ,&nbsp;Xiaocong Yang ,&nbsp;Yongsheng Kang ,&nbsp;Dongshuai Hou ,&nbsp;Xinyu Cong ,&nbsp;Shuang Lu","doi":"10.1016/j.conbuildmat.2024.139196","DOIUrl":"10.1016/j.conbuildmat.2024.139196","url":null,"abstract":"<div><div>This study investigates three treatment methods for removing organic residues and enhancing dyeing sludge (DS) activity: high-temperature calcination, Fenton oxidation, and mechanical grinding. The treated DS was used as a substitute for ground granulated blast slag (GGBS) in producing alkali-activated mortars. A comprehensive characterization of the chemical composition and microstructure of DS was conducted to evaluate the effectiveness of these treatment methods. Results showed that DS contains phosphorus oxides, which, upon dissolution, react with calcium and alkaline ions to form insoluble calcium phosphate and fluorine hydroxyapatite. Subsequently, the mechanical properties, micromorphology, and microstructure of alkali-activated mortars with varying DS contents were analyzed to assess the potential of treated DS as a precursor. Test results revealed that mechanical/heat-activated DS (HDS) experienced minimal strength reduction at 10 % doping, achieving a compressive strength of 99 % compared to the control group. However, controlling the amount of alkali used was crucial, as an increase in alkali resulted in decreased compressive strength. DS treated through mechanical/chemical activation (CDS) also showed promising results, with CDS-9 achieving a compressive strength of 78.4 % of the control group after 56 days of curing. Notably, although the early strength of specimens with CDS was lower, a more significant increase in strength was observed at later stages. Mechanical activation (MDS) had the most adverse effect on strength, independent of the curing duration. The pore size distribution of alkali-activated mortars can be optimized by refining the macro-pores in samples and transforming them into harmless gel pores through HDS and CDS integration. This study offers a feasible strategy for DS activation and demonstrates the highly promising utilization of DS as a precursor for alkali-activated materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139196"},"PeriodicalIF":7.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664188","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":"Micro-mechanical performance study of the interfacial transition zone in ultra-high performance concrete containing coarse aggregates based on digital image correlation method","authors":"Ziqi Gao ,&nbsp;Jintao He ,&nbsp;Ruoxi Yang ,&nbsp;Feipeng Zhu ,&nbsp;Pengxiang Bai ,&nbsp;Dong Lei","doi":"10.1016/j.conbuildmat.2024.139162","DOIUrl":"10.1016/j.conbuildmat.2024.139162","url":null,"abstract":"<div><div>To measure the mechanical properties of the interfacial transition zone (ITZ) in ultra-high performance concrete with coarse aggregates (UHPC-CA) under direct load, a mesoscopic experimental analysis is performed using a combination of an electron microscope (EM) camera and digital image correlation (DIC) technology in this study. With such a methodology, the stress-strain curve of the ITZ under compression is measured directly. Furthermore, the distribution of the nominal compressive elastic modulus (E*) and Poisson's ratio (v) of the ITZ is obtained. Finally, the effects of granulated blast-furnace slag (GGBS) contents (0 %, 30 %, 40 %, and 50 %) on ITZ’s properties are investigated, and their relevance to microstructure is further explored by scanning electron microscope (SEM). The results indicate that the E * in the ITZ follows a 'U'-shaped distribution. In comparison to the reinforced matrix, a compaction process in ITZ is observed obviously, resulting in a smaller v in this region. Besides, as the GGBS content increases, the mesoscopic mechanical properties of the ITZ gradually decline.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139162"},"PeriodicalIF":7.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664245","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":"Accelerated carbonation of lime-treated clayey geomaterials: A synergistic strategy for sustainable earthworks and carbon capture applications","authors":"Dhanalakshmi Padmaraj ,&nbsp;Chinchu Cherian ,&nbsp;Dali Naidu Arnepalli","doi":"10.1016/j.conbuildmat.2024.139078","DOIUrl":"10.1016/j.conbuildmat.2024.139078","url":null,"abstract":"<div><div>Lime is a popularly adopted binder for improving the mechanical properties and controlling the volume change behavior of problematic clayey soils. However, lime treatment offers certain limitations due to the durability issues arising from varying physico-chemical conditions exacerbated by climatic stresses or clay mineralogy. Lime-treated soils rich in mineral montmorillonite have experienced severe durability issues, with considerable strength decline, eventually falling below the minimum standards required for its application as a construction material. In this study, the innovative approach of “carbon mineralization” is adopted to augment the inadequate mechanical strength in the treated soil rich in mineral montmorillonite through carbonate cementation. Extensive mechanical and microstructure characterization techniques comprising unconfined compressive strength tests, scanning and transmission electron microscopy (SEM and TEM), thermogravimetric analysis (TGA), and mercury intrusion porosimetry (MIP) techniques were performed to identify the mechanism behind strength deterioration in lime-clay composites cured for 24 months in ambient conditions (99 % relative humidity and temperatures of 25 ℃ and 40 ℃). The results show that the unconfined compressive strength of treated soils reduced drastically beyond 9 months of curing. The newly derived parameter, effective precipitation factor from cementation levels, and macroporosity measurements at varying curing periods helped reveal the deterioration mechanism in the lime-clay composites. Accelerated carbonation of these composites resulted in a maximum of 74 % strength increment with a corresponding 15 % decrease in macroporosity. Carbonation enabled the nucleation of voluminous carbonates that fill and bridge the inter-aggregate pores of these composites via contact cementation, as evidenced by the micro-level images. In addition to rehabilitating deteriorated earthwork due to aging, the technique mitigates carbon emissions by capturing 37 % of CO₂ released during lime production into stable carbonate minerals, promoting environmental sustainability.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139078"},"PeriodicalIF":7.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664162","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":"Quasi-static and impact compression properties of glubam at different relative humidity conditions","authors":"C.Q. Chen ,&nbsp;Q.C. Zhang ,&nbsp;C. de Kergariou ,&nbsp;F. Scarpa ,&nbsp;Y. Xiao","doi":"10.1016/j.conbuildmat.2024.139172","DOIUrl":"10.1016/j.conbuildmat.2024.139172","url":null,"abstract":"<div><div>Glued laminated bamboo (glubam), a product of bamboo lamination, presents a distinctive combination of eco-friendliness and mechanical strength. This study delves into the quasi-static and dynamic compression behaviour of glubam, examining the influence of key factors such as moisture content and carbonization. The experiment involved one control group and two groups of different carbonized degrees, with two relative humidity controls set at 65 % and 85 %. The results of the quasi-static compression tests revealed that higher moisture content reduced the ultimate stress and modulus of compression while enhancing the ductility of thick-strip glubam. Cross bamboo alignment bolstered the compressive strengths of longitudinal thin-strip glubam and provided considerable compressive capacity for transverse thin-strip glubam. Poisson’s ratios of glubam were also determined. During drop-tower impact testing, an input energy of 209.5 J resulted in the determination of the dynamic ultimate stress of glubam. The application of reasonable image procedures, supported by high-speed camera collections, aided in the efficient presentation of absorbed energy. Scanning electron microscope (SEM) images were employed to explore experimental results through the microstructure perspective.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139172"},"PeriodicalIF":7.4,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664244","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":"Bond stress-slip properties and analytical models between high-strength lightweight aggregate concrete and high-strength steel bars","authors":"Hui Wei ,&nbsp;Zhengyan Xiao,&nbsp;Tao Wu,&nbsp;Shibo Zhao,&nbsp;Wenshuo Shen","doi":"10.1016/j.conbuildmat.2024.139110","DOIUrl":"10.1016/j.conbuildmat.2024.139110","url":null,"abstract":"<div><div>Twenty-eight pull-out specimens in thirteen groups were tested to investigate the bond properties between high-strength lightweight aggregate concrete (HSLC) and HRB600 bars with different bond lengths, steel fiber contents, concrete strength, and cover thickness. The analytical expressions for radial deformation, radial stress, and bond strength based on four deformation assumptions were derived and compared by incorporating the thick-walled cylinder model, bilinear softening constitutive curve, and fracture energy model of HSLC. Eventually, a three-segment bond stress-slip model was proposed. The test results showed that the increase in research parameters apart from bond length could improve the failure mode, bond strength, descending slope of curves, and bond toughness. The bond strength was in the range of 24.99 ∼ 39.79 MPa except for LC70–0S-L80 with splitting failure. The optimal match of mixture LC70–0.6S and HRB600 bars could fully utilize the mechanical properties of both materials, for which the allowable minimum ratio of cover thickness-to-rebar diameter was recommended to be 3.75. The bond toughness of specimens cast with LC70–0S, LC70–0.3S, LC50–0.6S, and LC70–0.6S increased sequentially at the same bond length. The calculation results indicated that the assumptions of constant and elastic deformation provided upper and lower predictions of bond strength, respectively, and the assumption of equivalent elastic deformation slightly overestimated the bond strength due to the nonlinear deformation of cracked concrete. The assumption of equivalent elastic deformation at cohesive stress equaling half of the tensile strength of concrete obtained satisfactory calculated bond strengths, and the predicted bond stress-slip curves agreed well with the experimental curves, describing accurately the cracking characteristics and bond behavior between HSLC and HRB600 bars.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"454 ","pages":"Article 139110"},"PeriodicalIF":7.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651289","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":"Intrusion kinetics and interfacial degradation mechanism of PU-steel system in chloride ion environment: A multiscale study","authors":"Yuxuan Wu ,&nbsp;Wenyuan Xu ,&nbsp;Endian Fan","doi":"10.1016/j.conbuildmat.2024.139151","DOIUrl":"10.1016/j.conbuildmat.2024.139151","url":null,"abstract":"<div><div>This study utilised density functional theory (DFT) to predict the movement pathways and rates of chloride ions within polyurethane (PU), as well as their molecular dynamics and charge distribution during the erosion process. Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and electrochemical tests revealed chemical and electrochemical changes at the PU/steel interface after immersion in sodium chloride solution. Shear strength and nanoindentation tests were used to examine the impact of microscale erosion on macroscale mechanical properties. The results showed that chloride-ion penetration into PU requires overcoming a substantial energy barrier driven by the concentration gradient between the saline solution and PU. After immersion in sodium chloride solution, the −N<img>C<img>O functional groups in PU were disrupted, reducing chemical stability and molecular elasticity. This process accelerates the hydrolysis of ester bonds, leading to a decline in interfacial mechanical properties. Electrochemical results showed that the resistance of the PU coating decreased over time, indicating a transition in the electrochemical reactions that eventually led to interfacial corrosion. After prolonged immersion, both the interfacial shear strength and modulus significantly decreased, whereas the shear ductility initially increased but later decreased.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"454 ","pages":"Article 139151"},"PeriodicalIF":7.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651291","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":"Optimization of ventilation and dust removal parameters in plateau extra-long tunnel inclined shaft based on orthogonal numerical simulation test method","authors":"Xiangdong Yang ,&nbsp;Zhongan Jiang ,&nbsp;Jihe Chen ,&nbsp;Ya Chen ,&nbsp;Bin Yang","doi":"10.1016/j.conbuildmat.2024.139131","DOIUrl":"10.1016/j.conbuildmat.2024.139131","url":null,"abstract":"<div><div>Ventilation and dust removal system in the inclined shaft of the plateau long tunnel is an important component for ensuring safe excavation. The arrangement of wind tube and the volume of air flow have a significant impact on the movement of dust. In order to address the issues of poor ventilation and severe dust pollution in the inclined shaft of plateau long tunnels, this study establishes a dust generation and transportation model for the face of the inclined shaft based on the determination of dust source parameters and their physicochemical characteristics during the excavation process. The results indicate that the particles are predominantly spherical with an approximate diameter of 4 μm at a magnification of 500 times. The dust in high-altitude inclined shafts exhibits poor wettability, with a hydrophobic tendency during the excavation phase, making a ventilation dust removal scheme appropriate. After determining the physical parameters corresponding to the elevation of the inclined shaft, a series of orthogonal numerical simulations involving 3 factors at 5 levels were conducted. Analysis of range and variance revealed that optimal dust control is achieved when the air duct height is 5.725 m, the distance from the working face is 21 m, and the exit wind speed is 29.71 m/s. Comparative analysis confirmed the rationality of the ventilation dust removal scheme under the optimal combination of ventilation parameters. This provides guidance for engineering and environmental management in similar construction scenarios.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139131"},"PeriodicalIF":7.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663952","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":"Application of porous luffa fiber as a natural internal curing material in high-strength mortar","authors":"Yi Han ,&nbsp;Mingxin Shi ,&nbsp;Sihwan Lee ,&nbsp;Runsheng Lin ,&nbsp;Kang-Jia Wang ,&nbsp;Xiao-Yong Wang","doi":"10.1016/j.conbuildmat.2024.139169","DOIUrl":"10.1016/j.conbuildmat.2024.139169","url":null,"abstract":"<div><div>This study explores the potential of renewable plant fibers as internal curing (IC) materials, analyzing their potential in high-strength mortar (HSM) applications. Experiments involving the incorporation of different volumetric ratios of luffa fiber into concrete assessed impacts on autogenous shrinkage (AS), mechanical properties, and microstructure. The research found that the addition of luffa fibers extended both the setting times of the mixture, and after final setting, continued the hydration reaction by releasing internally stored water. Compared to the control group, luffa fibers significantly reduced AS by up to 56.87 %, primarily due to their high-water absorption capacity (211 %), which mitigates the internal capillary pressures during the cement hydration process. Moreover, the inclusion of luffa fibers significantly affected the concrete's mechanical properties: a 1 % luffa addition enhanced the compressive strength at 28 days by 7.6 % over the control; concrete with 2 % luffa fiber exhibited the highest flexural strength at 28 days, showing a 9.4 % increase over the control. Microstructural analysis revealed that luffa fiber not only promoted continued hydration but also increased the content of hydration products and enhanced the compactness of the cementitious matrix. Overall, luffa fibers effectively reduce HSM’s AS and enhance its mechanical properties and microstructure, showing potential to improve concrete performance.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"455 ","pages":"Article 139169"},"PeriodicalIF":7.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664027","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}