Construction and Building Materials最新文献

{"title":"Comparative analysis of four styrene-butadiene-styrene (SBS) structure repair agents in the rejuvenation of aged SBS-modified bitumen","authors":"Haozongyang Li ,&nbsp;Chengwei Xing ,&nbsp;Bohan Zhu ,&nbsp;Xiao Zhang ,&nbsp;Yang Gao ,&nbsp;Shixian Tang ,&nbsp;Huailei Cheng","doi":"10.1016/j.conbuildmat.2025.141232","DOIUrl":"10.1016/j.conbuildmat.2025.141232","url":null,"abstract":"<div><div>At present, a large number of styrene-butadiene-styrene (SBS) block copolymer-modified bitumen pavements are approaching the end of their service life, leading to the generation of substantial amounts of reclaimed asphalt pavement (RAP) from maintenance and rehabilitation projects. Recycling RAP with rejuvenators not only mitigates waste but also offers a sustainable approach to pavement restoration. This study aims to achieve high-quality rejuvenation of aged SBS-modified bitumen (SMB) by employing aromatic oil (AO) as a colloidal structure regulate agent and using methylene-bis (4-cyclohexylisocyanate) (HMDI), hexamethylene diisocyanate (HDI), triallyl isocyanurate (TAIC), and trimethylolpropane triglycidyl ether (TMPGE) to repair the degraded SBS structure. Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy (FM) were employed to investigate the repairing mechanisms and effectiveness of rejuvenators on fracture crosslinking structure for degraded SBS. The rheological performance of the rejuvenated SMB was subsequently evaluated using dynamic shear rheometer (DSR), and the discussion of links between the microstructure and macroscopic performance was conducted. The results reveal that the isocyanate groups in HMDI and HDI react with hydroxyl and carboxyl groups in degraded SBS structure, forming carbamate and amide bonds. This reaction reconnects the SBS modifier and create cross-linked network structures. In contrast, TAIC and TMPGE show limited efficacy in reconstructing the network structures, resulting in less significant improvements. This microstructure difference is reflected in the macroscopic performance. The critical temperature of high- and low-temperature of HMDI-rejuvenated SMB are measured at 93.9°C and −22.1°C, while those of HDI-rejuvenated SMB are 90.6°C and −22.2°C. Both values consistently exceed the critical temperature of virgin SMB, which exhibit critical temperature of high- and low-temperature of 85.9°C and −21.1°C. In contrast, the performance of bitumen rejuvenated with TAIC and TMPGE is comparable to that of AO-alone rejuvenated bitumen.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141232"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823252","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":"Automatic detection, localization and quantification of structural cracks combining computer vision and crowd sensing technologies","authors":"Tao Jin ,&nbsp;Xiao-Wei Ye ,&nbsp;Wei-Ming Que ,&nbsp;Ming-Yang Wang","doi":"10.1016/j.conbuildmat.2025.141150","DOIUrl":"10.1016/j.conbuildmat.2025.141150","url":null,"abstract":"<div><div>The emerging of computer vision based methods provides the capacity to detect and quantify the structural damages efficiently. Moreover, the integration of high-performance sensors in the mobile phone allows for the efficient acquisition of multi-source heterogeneous data of damages such as images, locations, etc. This study proposed a computer vision and crowd sensing based method to detect and quantify structural cracks for the distributed in-service bridges. A previously established crowd sensing system was employed to acquire bridge structural cracks and the corresponding locations, which is consisted of a mobile application (APP) and the cloud management platform. As many as 15 volunteers were mobilized to use the APP to collect the multi-source heterogeneous data of cracks from in-service bridges, which consists of 223 crack images, covering 5 typical bridge structural components, i.e., the guardrails, the road surfaces, the beam undersides, the abutments and the piers. Then, the classic U-Net model was trained to segment the crack regions from the image background. Finally, an image skeleton-based processing method was proposed to acquire the pixel size of the cracks for quantitative evaluation. Testing results show that for images with a resolution of 256 × 256 pixels, the crack width is within 10 pixels, while the crack length ranges from 200 to 500 pixels, the error compared to the actual value is within 5 %. Crack images from different scenarios were used to test the applicability of the proposed method. This study provides a novel method to alleviate the demand for professional inspection engineers and vehicles, and validates the feasibility of the proposed method in practical application.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141150"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823495","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":"Selection method of gradation index in hydraulic asphalt concrete considering skeleton effect","authors":"Kudereti Rehaman,&nbsp;Yanlong Li,&nbsp;Yunhe Liu,&nbsp;Lifeng Wen,&nbsp;Ye Zhang","doi":"10.1016/j.conbuildmat.2025.141270","DOIUrl":"10.1016/j.conbuildmat.2025.141270","url":null,"abstract":"<div><div>Currently, the aggregate gradation design method for hydraulic asphalt concrete (HAC) fails to fully consider the primary-secondary contributions and skeleton effects of coarse and fine aggregates in the asphalt mixture matrix, presenting certain limitations. To address this, this study proposes a gradation index selection method based on the Ding Purong formula, aiming to optimize aggregate gradation design by considering skeleton effects to enhance asphalt concrete performance. Through vertical vibration compaction method, this approach measures skeleton strength (CBR value) and compactness indicators (volume change rate, compacted density, void ratio) of aggregates with different gradation index; And perform statistical analysis on the experimental data, comprehensively evaluating and identifying the optimal aggregate skeleton (gradation index n) that simultaneously possesses both strength and density. Under consistent filler concentration and asphalt-aggregate ratio, performance comparisons of asphalt concrete specimens prepared with different skeleton-effect aggregates verified the method's practicality. Results demonstrate: Aggregates with different gradation index show significant skeleton effect differences, with n = 0.37 exhibiting maximum CBR value (156.2 %) combined with minimum void ratio and maximum density; Specimens based on this optimal skeleton achieved peak splitting strength (3.34 MPa) and low porosity (1.74 %). This research provides new theoretical support and technical methodology for HAC gradation design, offering significant engineering application value.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141270"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823503","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":"Arrhenius model-based analysis of high-temperature properties and temperature sensitivity of SBS/CR modified asphalt","authors":"Wen Tian ,&nbsp;Chunhua Hu","doi":"10.1016/j.conbuildmat.2025.141298","DOIUrl":"10.1016/j.conbuildmat.2025.141298","url":null,"abstract":"<div><div>The response of modified asphalt binders to temperature exhibits considerable variability depending on the binder type and composition. This variability can lead to biases in evaluating high-temperature performance. This study comprehensively evaluates the high-temperature rheological properties and thermal stability of SBS-modified and crumb rubber (CR)-modified bitumen, utilizing Dynamic Shear Rheometer, FM, FTIR, TGA-DSC tests. The findings indicate that mechanical properties—including dynamic shear modulus, rutting factor, non-recoverable creep compliance, and zero shear viscosity—adhere to Arrhenius behavior as a function of temperature, yet phase angle presents non-Arrhenius characteristics. The thermal dependence of mechanical properties is quantified by the Arrhenius model parameter activation energy (<em>E</em>_a), with <em>E</em>_a values varying by binder type, polymer content, and test method. Specifically, the rutting factor exhibits weak temperature dependence for all binders, likely due to test conditions of linear elasticity and small strain. Furthermore, the <em>E</em>_a parameter of viscoelastic properties of SBS and CR binders shows a nonlinear frequency dependence within the experimental frequency range (0.01 Hz to 10 Hz). Increasing polymer concentration, the response of <em>E</em>_a to frequency changes accelerated. TGA-DSC testing revealed that CR and SBS raise the initial decomposition temperature of pure asphalt by 6.1 % and 5.4 %, respectively, while the thermal decomposition of SBS accelerated mass loss in the modified asphalt. FTIR analysis showed that CR formed chemical bonds with asphalt, while SBS provided physical modification. During aging, storage modulus showed greater aging sensitivity than loss modulus, making it a better indicator of aging resistance. A refined ranking parameter <span><math><mrow><mo>[</mo><mrow><mfrac><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow><mrow><mrow><msup><mrow><mi>G</mi></mrow><mo>*</mo></msup></mrow><mo>/</mo><mrow><mi>sin</mi><mspace></mspace><mi>δ</mi></mrow></mrow></mfrac></mrow><mo>]</mo></mrow></math></span>was proposed based on rheological theory and the Arrhenius model applied across a wide temperature range. The parameter not only enhances the evaluation of the rutting factor in the SHRP system but also provides an important reference for considering temperature sensitivity in high-temperature specifications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141298"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823506","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":"Preparation of graphene-coated lithium slag and its effect mechanism on cement-based composites","authors":"Lei Zhang ,&nbsp;Gaoyin Zhang ,&nbsp;Laibao Liu ,&nbsp;Li Yang ,&nbsp;Lihua Zhang ,&nbsp;Xu Luo ,&nbsp;Tao Gu ,&nbsp;Xue Ma ,&nbsp;Peng Zhao","doi":"10.1016/j.conbuildmat.2025.141243","DOIUrl":"10.1016/j.conbuildmat.2025.141243","url":null,"abstract":"<div><div>Graphene and its derivatives are widely used nanomaterials within high-performance cementitious composites in the construction industry. However, their tendency to agglomerate presents challenges for uniform dispersion, limiting their effectiveness. This study proposes an in-situ modification strategy to synthesize graphene directly onto a carrier, improving its dispersion and ensuring its reinforcing effects. Nitrate lithium slag (NLS), an industrial solid waste obtained through pressurized nitric acid leaching of spodumene, is a highly active supplementary cementitious material that can serve as carrier for in situ graphene synthesis. In this study, a carbothermal reduction method was used to prepare a graphene-coated NLS composite (G@NLS). The results demonstrated that graphene was successfully grown in situ on the surface of NLS, exhibiting excellent dispersion and strong interfacial bonding. Compared to pure cement paste, the incorporation of G@NLS reduced the fluidity and extended the setting time of cement paste. Compared to pure cement blocks, G@NLS enhanced the compressive and flexural strengths of cement blocks by 27.5 % and 33.1 % after 28 d. The graphene in G@NLS acts as a nucleation site, promoting the secondary hydration of NLS, and also contributes to pore-filling.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141243"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823412","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 and chemical characterization of glass powder and silica fume ternary concrete after seven years of alkali-silica reaction expansion exposure","authors":"Wena de Nazaré do Rosário Martel,&nbsp;Josée Duchesne,&nbsp;Benoît Fournier","doi":"10.1016/j.conbuildmat.2025.141279","DOIUrl":"10.1016/j.conbuildmat.2025.141279","url":null,"abstract":"<div><div>It is recognized that the combination of glass powder (GP) with other supplementary cementitious materials (SCMs) has a synergistic effect in controlling ASR expansion, as GP alone at OPC replacement levels of 20 and 30 % is not sufficient to limit expansion below the normative threshold of 0.040 % in two years. However, the mechanisms behind this synergy are not well understood, particularly concerning the prevention of late alkali release from GP. To investigate this, a protocol designed for the analysis of alkali-rich materials was applied to GP/silica fume ternary concrete samples stored for over seven years under concrete prism expansion test (CPT) conditions, using microprobe microstructural and chemical characterization, together with elemental mapping of solid phases (C-S-H, ASR products and GP particles). The results indicate that a significant proportion of the GP does not fully react but does alter the Na and Si content in the hydrates. Furthermore, doubling the SF content in the mixture tripled the Na/Si ratio in the C-S-H for a similar GP content, while tripling the GP content had minimal effect when keeping the SF content constant. A portlandite barrier limits GP dissolution at lower dosages. The GP reactivity is critical; faster dissolution promotes early alkali uptake in C-S-H with a Na/K incorporation ratio of 3:1. The results confirm the importance of combining GP with a highly reactive SCM, such as SF, to optimize alkali binding in the C-S-H structure.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141279"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823416","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":"Temporal and spatial variations of mechanical performance and microstructure of mature concrete under long-term low vacuum condition","authors":"Xiaolong Wang ,&nbsp;Honglei Chang ,&nbsp;Shaowei Li ,&nbsp;Yunxiang Jia ,&nbsp;Feng Guo ,&nbsp;Pan Feng","doi":"10.1016/j.conbuildmat.2025.141202","DOIUrl":"10.1016/j.conbuildmat.2025.141202","url":null,"abstract":"<div><div>Rapid moisture loss under low vacuum condition (LVC) would alter the microstructure of concrete materials, presenting substantial challenge to their long-term mechanical performance and receiving increasing attention. In this study, a two-year exposure experiment was conducted to investigate the spatiotemporal effects of long-term LVC on the static and dynamic mechanical properties, phase composition, multi-scale pore structure, and interfacial transition zone (ITZ) of mature concrete cured for 28 days. Experimental results show that compared to normal air condition (NAC), short-term (1 month) LVC exposure initially enhances the compressive strength of mature concrete, whereas prolonged LVC exposure leads to a decline of 2.4∼10.4 % in compressive strength and 5.0∼22.1 % in flexural strength. Correspondingly, compared to NAC, the ultimate strain and impact toughness of concrete after long-term LVC exposure are reduced by as much as 35.2 % and 36.8 %, respectively. Moreover, LVC does not alter the type of hydration products, but it inhibits further hydration. This inhibition not only leads to an increase in mesoscopic pores of 750–1100 μm but also results in an increase in the total porosity and the most probable aperture at the micro-nano scale. Furthermore, prolonged LVC exposure produces a looser morphology of the ITZ between the coarse aggregate and paste, along with a reduction in indentation modulus and an increase in thickness by 10μm. Additionally, in space terms, the adverse effect of prolonged LVC on strength and microstructure of mature concrete significantly decreases with increasing exposure depth. Lastly, a physical model based on dynamic moisture loss is proposed to explain the microstructure changes in the matrix after LVC exposure, offering deeper insights into the spatiotemporal evolution mechanism of mature concrete’s mechanical performance under LVC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141202"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823420","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":"Failure mechanisms of geogrid-reinforced asphalt pavements: A viscoelastic 3D FEM analysis","authors":"Sohrab Zarei,&nbsp;Weilong Wang,&nbsp;Jian Ouyang,&nbsp;Wanqiu Liu","doi":"10.1016/j.conbuildmat.2025.141217","DOIUrl":"10.1016/j.conbuildmat.2025.141217","url":null,"abstract":"<div><div>The increasing traffic volume, axle loads, and tire contact pressures significantly impact asphalt pavement performance, often accelerating early-stage failures like rutting and cracking before the expected service life is reached. To improve the sustainability and resilience of pavements, new materials and technologies have been integrated into pavement design and construction. One such technology is geosynthetics, which have been widely implemented to improve pavement performance. The objective of this research is to evaluate the impact of placing different geogrids within the asphalt layer on mitigating or preventing rutting and fatigue cracking (both bottom-up and top-down) in pavements. To achieve this, viscoelastic analyses of reinforced and unreinforced pavements were conducted under non-uniform tire–pavement contact stresses (including wide-base and dual-tire configurations) using a three-dimensional (3D) finite-element (FE) model. The critical responses associated with the primary failure mechanisms at medium to high temperatures were then computed and compared. The results indicate that placing high modulus geogrids, especially at the bottom or one-third of the asphalt concrete layer, significantly enhances pavement performance at elevated temperatures. Geogrid reinforcement, particularly geogrid type one (GEO1), reduced vertical compressive strain by 28.1 % and shear strain by 48.4 % at 50°C, effectively mitigating rutting. Additionally, strategic geogrid placement reduced transverse strains by up to 42 %, alleviating top-down cracking (TDC). This research highlights the importance of geogrid type, AC layer thickness, and vehicle speed in optimizing pavement resistance to deformation and cracking.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141217"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823496","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 physical, mechanical and thermal properties of two-part geopolymer mortar by Taguchi method","authors":"Asena Karslioğlu-Kaya,&nbsp;Mehmet İnanç Onur","doi":"10.1016/j.conbuildmat.2025.141208","DOIUrl":"10.1016/j.conbuildmat.2025.141208","url":null,"abstract":"<div><div>The reuse of waste materials is vital for reducing environmental impacts and developing sustainable construction materials. Traditional concrete, the second most used material globally, contributes significantly to carbon emissions. To address this, researchers are exploring alternative binders, with geopolymer emerging as a sustainable option due to its strength, durability, and use of recycled waste materials. In this article, the physical, mechanical and thermal properties of geopolymer mortars produced using Taguchi optimization were investigated. This approach enables the exploration of how specific process factors work together to influence the outcome, requiring the fewest possible experiments. As a result, it cuts down on the overall time, expenses, and labor involved in the process. Four factors including utilization of boron waste (at 4 levels of 0, 5, 10 and 15 %), utilization of silica fume (at 4 levels of 0, 5, 10 and 15 %), sodium (Na) concentration (at 4 levels of 6, 8, 10 and 12 %) and oven curing temperature (at 4 levels of 40, 60, 80 and 100 ⁰C) were considered. The achieved outcomes underwent assessment through the analysis of variance (ANOVA) technique in order to ascertain the most favorable magnitude for each individual factor. The results obtained from Taguchi analyses provide a significant roadmap for the advancement of geopolymer concrete technology. Laboratory scale experiment using the Taguchi optimization method have revealed that oven curing temperature significantly increase the mechanical strength of the mortar, as they contribute to ensuring homogeneity in the mortar. On the other hand, the influence of amount of silica fume was more limited. The amount of boron waste also plays a crucial role in the overall strength of mortar, with an optimal waste found to enhance both the strength of mortar and reduce thermal conductivity and specific weight. Results revealed that optimal conditions decreased thermal conductivity by 75.9 %, while flexural strength increased by 12.6 % compared to the reference mix. Specific weight was reduced by 10.3 %, and compressive strength remained comparable to the reference mix. The findings demonstrate that waste materials significantly enhance strength and insulation, providing a cost-effective, environmentally friendly alternative to traditional construction materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141208"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823410","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 3D cellular automata simulation of corrosion evolution and mechanical property in weathering steel and butt welds","authors":"Wei Lu,&nbsp;Zhiyu Jie,&nbsp;Hao Zheng,&nbsp;Lexin Zhang","doi":"10.1016/j.conbuildmat.2025.141290","DOIUrl":"10.1016/j.conbuildmat.2025.141290","url":null,"abstract":"<div><div>Weathering steel is increasingly used in bridge engineering due to its excellent atmospheric corrosion resistance. However, corrosion damage and mechanical property degradation, especially in marine environments, remain critical concerns. This study conducted accelerated corrosion tests on weathering steel and butt weld specimens under three corrosion levels, characterizing surface corrosion morphology and pit depth distribution using 3D laser scanning. An innovative 3D cellular automata (CA) model combined with a genetic algorithm was developed to reconstruct corrosion morphology based on actual corrosion parameters. Mechanical properties of uncorroded and corroded specimens were obtained by monotonic tensile tests and elastoplastic finite element analyses. The results show that the weld metal zone exhibits the highest corrosion resistance, while the heat-affected zone shows the lowest. The improved 3D CA model predicts pit depths with an error margin of less than 5 %, demonstrating high accuracy. Pit depths for base metal and weld specimens follow lognormal and normal distributions, respectively. As the corrosion degree increases, the elastic modulus, yield strength, tensile strength, and elongation decrease, with maximum reductions of 27.21 %, 9.56 %, 9.75 %, and 48.28 %, respectively. A linear relationship is observed between the degradation rate and the corrosion degree, except for elongation in weld specimens. Stress concentration and mechanical property degradation are more pronounced in weld specimens compared to base metal specimens. The proposed 3D CA model is validated for accurately simulating both corrosion processes and mechanical property degradation.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"476 ","pages":"Article 141290"},"PeriodicalIF":7.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823411","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}