Construction and Building Materials最新文献

{"title":"Enhancing chemical binding of internal chlorides in ultra-high performance seawater and sea sand concrete through the synergistic effect of metakaolin and alkali-rich white mud","authors":"Bohan Yang ,&nbsp;Xiaowei Gu ,&nbsp;Zhijun Li ,&nbsp;Zhihang Hu ,&nbsp;Jianping Liu ,&nbsp;Dong Han ,&nbsp;Qing Wang","doi":"10.1016/j.conbuildmat.2026.145855","DOIUrl":"10.1016/j.conbuildmat.2026.145855","url":null,"abstract":"<div><div>Ultra-high performance seawater and sea sand concrete (UHPSSC) is a promising material for marine engineering applications; however, reinforcement corrosion induced by internal chlorides remains a critical challenge. This study aims to address this issue by exploring the synergistic use of metakaolin (MK) and alkali-rich white mud (WM) as supplementary cementitious materials to regulate chloride binding and mitigate corrosion risk in UHPSSC. The study investigates replacing silica fume with MK and incorporating 10 wt.% and 20 wt.% WM into UHPSSC. The mechanical properties, hydration behavior, microstructure, and chloride binding capacity are analyzed. Complete replacement of silica fume with MK reduced compressive strength from 131.5 MPa to 123.6 MPa at 28 days, while 10 wt.% WM (WM10) counteracted this reduction, increasing strength by 3%. However, 20 wt.% WM caused significant performance deterioration. Microstructural analysis revealed that MK alone deteriorates the pore structure, whereas WM10 enhances pozzolanic reactions and reduces porosity. MK significantly increases chloride immobilization, and WM further strengthens chemical chloride binding, with WM10 showing nearly twice the amount of chemically bound chlorides at 60 days compared to conventional UHPSSC. WM10 effectively mitigates corrosion risk in UHPSSC by reducing the free chloride content by over 30% and achieving the lowest [Cl⁻]/[OH⁻] ratio (≈0.017), well below the corrosion threshold. This study establishes a solid theoretical framework for UHPSSC mix design and presents an innovative approach for controlling chloride-induced corrosion in marine concrete.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145855"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388225","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":"Durability performance of natural rubber latex and high-volume fly ash incorporation in hybrid fibres concrete under aggressive environments","authors":"Hassaan Bin Tariq,&nbsp;Roszilah Hamid,&nbsp;A.B.M. Amrul Kaish,&nbsp;Shahrizan Baharom,&nbsp;Anis Azmi","doi":"10.1016/j.conbuildmat.2026.145873","DOIUrl":"10.1016/j.conbuildmat.2026.145873","url":null,"abstract":"<div><div>This study investigates the combined effect of natural rubber latex (NRL) and high-volume fly ash (HVFA) on the durability performance of hybrid fibres concrete. Previous study has shown that incorporating 2.5% NRL and HVFA as cement replacement produces optimum mechanical properties of hybrid fibres concrete mix at 28 days (52 MPa - coded OM), compared to the control mix (56 MPa - coded CM). The specimens were then exposed to sulfuric acid (H₂SO₄, 5%), sodium sulphate (Na₂SO₄, 5%) and sodium chloride (NaCl, 3%) solutions. Results show that under acidic conditions, both mixes deteriorated severely, from 52 MPa and 56 MPa to 8 MPa and 9 MPa (180 days exposure). However, OM samples showed superior residual compressive strength, that is, higher 18%, 28%, and 17% at 56, 90, and 180 days exposure, respectively, and lower mass loss, less 20.5%, 68%, and 51.2%, compared to CM, complementing FESEM results showing pore refinement due to latex incorporation. Under sulphate and chloride exposures, both mixes show high resistance, with OM samples outperformed CM up to 90 days sulphate exposure, demonstrated through increased strength compared to 28 days strength and mass gain (peak 2.24% at 90 days – sulphate and 3.1% at 56 days - chloride) instead of mass loss. However, at 180 days, OM started to deteriorate, with reasonable strength losses (21% and 19%) but insignificant mass loses (1% and 0.3%) under sulphate and chloride, respectively. Physical observations confirmed volume changes in acid-exposed specimens, whereas no deterioration or significant volume change under sulphate and chloride environments.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145873"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388231","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 and strength behaviour of foamed concrete under true triaxial compression","authors":"Hongzhi Zhang ,&nbsp;Chuo Zhao ,&nbsp;Nengdong Jiang ,&nbsp;Shengyou Yang ,&nbsp;Bo Li ,&nbsp;Shu Liu ,&nbsp;Zhi Ge","doi":"10.1016/j.conbuildmat.2026.145894","DOIUrl":"10.1016/j.conbuildmat.2026.145894","url":null,"abstract":"<div><div>Foamed concrete is a lightweight and easily placed material with adjustable strength, which is promising for highway subgrade/backfill application. However, the uniaxial or conventional triaxial test cannot capture its behaviour under complex in-service multiaxial stress states. To this end, this study investigates the response of foamed concrete under true triaxial conditions with wet densities from 600 to 1000 kg/m³ under varied confining pressures. Stress-strain behaviours, energy dissipations, and failure modes were analysed, with an emphasis on the influence of the intermediate and minor principal stresses. Results show that confining pressure enhances the compressive strength, and the extent of the enhancement is determined by the ratio of the von Mises stress and the hydrostatic stress. Air void buckling dominates along the minor principal stress direction, whereas brittle shear failure prevails in both the intermediate and the minor principal stress direction. Finally, Miller’s yield criterion is shown to successfully predict the strength of foamed concrete under true triaxial loading. The scaling laws are proposed to correlate the peak stress, elastic strain energy ratio, and Miller’s model parameters with porosity. The study contributes to the knowledge of the mechanical behaviour of foamed concrete under a true triaxial stress state.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145894"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388247","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":"Eco-efficient sodium alginate-enhanced MICP for graphite tailings stabilization: Mechanical performance and weathering resistance","authors":"Huijie Huang ,&nbsp;Xin Xu ,&nbsp;Qing Wang ,&nbsp;Xiaoqing Yuan ,&nbsp;Huiting Gao ,&nbsp;Qirui Zheng","doi":"10.1016/j.conbuildmat.2026.145930","DOIUrl":"10.1016/j.conbuildmat.2026.145930","url":null,"abstract":"<div><div>With the expansion of mining activities, the long-term open storage of tailings produced in the process of mineral processing has become an important source of dust pollution and environmental risk in mining areas, posing potential threats to the stability of ecosystem and human health. Microbially induced calcium carbonate precipitation (MICP) is a promising green solidification technology; however, its long-term stability and solidification performance remain to be improved. In this study, sodium alginate (SA), a naturally degradable polysaccharide, was introduced as a bioenhancer for MICP. The effects of SA dosage on urease activity, CaCO₃ content, mechanical strength, and resistance to wind and rainfall erosion were systematically investigated. The underlying synergistic solidification mechanisms of the SA–MICP process were elucidated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results demonstrate that SA exhibits a pronounced concentration \"window effect\", achieving optimal curing performance at a 1.5% dosage. The urease activity reaches 162.5 U/L with 61.8% CaCO3 content. Compared to SA-free samples, the unconfined compressive strength and splitting tensile strength increase by 1.22-fold and 3.95-fold respectively. Meanwhile, the UCS/STS ratio drops significantly from 6.26 to 2.81, indicating that SA primarily enhances interfacial bonding and crack resistance. Additionally, the material shows marked improvements in surface hardness, Young's modulus, wind erosion resistance, and rain erosion resistance. Microstructural analyses indicated that SA facilitated Ca^2 + chelation via its carboxyl groups, promoting oriented CaCO₃ nucleation and the formation of an organic–inorganic composite cementation network, thereby increasing the homogeneity and compactness of the precipitate structure. In contrast, excessive SA (&gt;3%) hindered mass transfer and led to nonuniform precipitation, reducing the solidification efficiency. Overall, this work demonstrates that the SA–MICP synergistic approach can markedly increase the strength and environmental durability of tailings, offering a green and efficient strategy for dust control and ecological restoration in mining areas and providing theoretical and engineering foundations for MICP applications under extreme climatic conditions.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145930"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388288","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 molar ratio on properties of MgO-hydromagnesite binder","authors":"Zhen Li ,&nbsp;Lulu Zhang ,&nbsp;Zhongcheng Li ,&nbsp;Yongbo Huang ,&nbsp;Hao Tang ,&nbsp;Jueshi Qian","doi":"10.1016/j.conbuildmat.2026.145863","DOIUrl":"10.1016/j.conbuildmat.2026.145863","url":null,"abstract":"<div><div>The performance and quality of MgO-based cement largely depend on the molar ratio of its constituent reactants. The MgO-hydromagnesite (MgO-HY) system is a new type of low-carbon MgO-based cementitious material, but the influence of the key component ratio of MgO/hydromagnesite on its performance has not yet been studied. To clarify the performance characteristics of the MgO-HY system and optimize its composition ratio, this study investigates the MgO/hydromagnesite molar ratio (e.g. 8/1,16/1, 32/1, 64/1, 96/1 and 128/1) on properties of MgO-HY paste and mortar. The fluidity, setting time, compressive strength, dimensional stability, bulk density and permeable porosity of MgO-HY binder are tested. Mortar specimens with varying water-binder ratios are prepared and tested to evaluate their mechanical performance. The phase formation and micromorphology are analyzed to correlate microstructural development with macroscopic properties. Results demonstrate that higher MgO/hydromagnesite ratio promote the generation of hydrous carbonate containing brucite (HCB), which accelerates setting, improves strength and reduces drying shrinkage. However, beyond a molar ratio of 96/1, the effectiveness of HCB in filling pore space diminishes due to reduced crystal size, leading to decreased strength and slightly increased shrinkage. Optimal performance, characterized by high strength and minimal shrinkage, is observed within the molar ratio range of 32/1–96/1. Additionally, lowering the water-binder ratio significantly enhances mortar strength, achieving a maximum value of 51.8 MPa.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"519 ","pages":"Article 145863"},"PeriodicalIF":8.0,"publicationDate":"2026-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388451","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 effects of sodium citrate, sodium tripolyphosphate and the plant protein on properties of 3D printing gypsum-based materials: Retardation mechanism at ultralow content","authors":"Xinxin Yu ,&nbsp;Kai Ma ,&nbsp;Xingyu Gan ,&nbsp;Yali Li ,&nbsp;Laibo Li ,&nbsp;Haiming Zhang ,&nbsp;Lingchao Lu","doi":"10.1016/j.conbuildmat.2026.145685","DOIUrl":"10.1016/j.conbuildmat.2026.145685","url":null,"abstract":"<div><div>Retarders are indispensable admixtures for ensuring sufficient printability time of 3D printing gypsum-based materials. However, a well-established fact related to high retarder content that excessive retarder content can reduce the mechanical properties of gypsum pastes. Therefore, the crucial strategy for expanding the application of 3D printing gypsum-based materials is to achieve efficient retarder at ultralow content. This study systematically analyzed the mechanisms of sodium citrate, sodium tripolyphosphate, and the plant protein retarder on gypsum-based 3D printing materials at ultralow content by workability, mechanical properties, and microstructure test. The results demonstrated that the plant protein retarder exhibited optimal performance in enhancing the workability and mechanical properties of the paste. When the content of this retarder was 0.4 ‰, the initial setting time of the gypsum paste was extended from 7 min to 56 min, while increasing the 7-day compressive and flexural strengths of the gypsum specimens by 81.63 % and 47.19 %, respectively. Mechanistically, the three retarders differed in gypsum particle adsorption due to distinct anionic structures, regulating setting time differently. These retarders complexed with Ca^2 + to form insoluble compounds, reducing hemihydrate gypsum dissolution and transforming dihydrate gypsum crystals from elongated prisms to plate-like structures. Enhanced crystal interlocking reduced hardened paste porosity, ultimately improving mechanical strength.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"516 ","pages":"Article 145685"},"PeriodicalIF":8.0,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387207","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":"Prestressed high-strength high-modulus engineered cementitious composites towards resilient infrastructures","authors":"Ziming Tang ,&nbsp;Yao Ding ,&nbsp;Gang Liao ,&nbsp;Fei Wang ,&nbsp;Long Liang ,&nbsp;Victor C. Li ,&nbsp;Kequan Yu","doi":"10.1016/j.conbuildmat.2026.145607","DOIUrl":"10.1016/j.conbuildmat.2026.145607","url":null,"abstract":"<div><div>High-strength and High modulus Engineered Cementitious Composites (HSHM-ECC) features excellent tensile ductility, high tensile/compressive strength and elastic modulus. Prestressing technology can effectively improve the crack resistance performance, durability and load-bearing capacity of concrete structures. It is expected that the application of HSHM-ECC in the prestressed systems will further enhance the structural durability and ductility. In this research, a HSHM-ECC with elastic modulus exceeding 45 GPa, 28-day drying shrinkage less than 400 με, 120-day creep coefficient less than 0.5 and chloride diffusion coefficient of 0.04 × 10⁻¹² m²/s was developed. The local compression characteristics of HSHM-ECC were investigated and a novel prestressed HSHM-ECC composite beam system was then proposed. The flexural and shear performance of prestressed HSHM-ECC beams were preliminarily evaluated, which revealed superior structural performances over the prestressed mortar and UHPC beams at serviceability and/or ultimate limit states. The cracking load and bearing capacity of prestressed HSHM-ECC beams under the serviceability limit state have increased by 107.1 % and 23.1 % respectively compared with those of ordinary HSHM-ECC beams. The energy absorption of prestressed HSHM-ECC beams was increased by 284.4 %, 384.1 % and 101.0 % respectively compared with that of prestressed mortar beam, prestressed UHPC beam and ordinary HSHM-ECC beams. This paper demonstrates the feasibility of prestressed HSHM-ECC components based on the tests at both material and structural component levels. The proposed prestressed HSHM-ECC composite components have application potential for bridges, industrial buildings, railway sleepers and marine structures (e.g., exploration platforms and floating structures) with enhanced structural resilience.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"516 ","pages":"Article 145607"},"PeriodicalIF":8.0,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387211","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 evaluation of crumb rubber concrete with multi-blended industrial waste aggregate and SCMs: Strength, durability, microstructure, and ML prediction","authors":"Subham Mishra ,&nbsp;Swetapadma Panda ,&nbsp;Debashis Bhowmik ,&nbsp;Sayantan Guha","doi":"10.1016/j.conbuildmat.2026.145677","DOIUrl":"10.1016/j.conbuildmat.2026.145677","url":null,"abstract":"<div><div>Rubberized concrete offers notable environmental benefits through waste tire utilization; however, its application is constrained by comparatively low mechanical strength. The addition of suitable industrial waste materials may offer a viable strategy to offset the strength reduction and improve the structural performance of rubberized concrete. Consequently, researchers are investigating supplemental cementitious materials (SCMs) as alternatives to conventional binders and industrial waste materials as substitutes for fine aggregates in the construction industry. This study proposes a framework to improve the properties of blended crumb rubber concrete (BCRC) incorporating industrial by-products such as copper slag (CS) and steel slag (SS) as fine aggregates, along with silica fume (SF) and rice husk ash (RHA) as SCMs. Four types of BCRC mixes were investigated for fresh concrete properties, mechanical properties through compressive, split tensile, and flexural strengths, as well as durability indicators like alkali–silica reaction (ASR) and rapid chloride penetration test (RCPT). Out of all mixes, BCRC4 (20 %CR+20 %SF+10 %RHA+20 %CS+10 %SS) shows the 54 % improved strength and durability properties that resulted from balanced use of SCMs and industrial waste materials. However, predicting the compressive strength of BCRC remains complex due to its heterogeneous composition and age-dependent behavior. To address this, seven widely used machine-learning techniques were employed to estimate compressive strength at advanced curing ages, including linear regression, decision tree, random forest, extreme gradient boosting (XGBoost), support vector machine (SVM), and Lloyd’s algorithm (K-means clustering). Model performance was evaluated using regression analysis and statistical indicators. Among the models, linear regression demonstrated the highest predictive accuracy, achieving an R² value of 0.94 with the lowest mean squared error (0.39) and mean absolute error (0.48). Furthermore, SHAP (SHapley Additive exPlanations) analysis was conducted for the optimal BCRC4 mix to interpret the contribution of individual input variables, providing valuable insights into the influence of alternative fine aggregates and SCMs on compressive strength development with curing age.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"516 ","pages":"Article 145677"},"PeriodicalIF":8.0,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387159","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":"Corrigendum to “Study on the meso-scale numerical simulation method for flow behavior of fresh self-compacting steel fiber reinforced concrete based on DEM-SPH coupling” [Constr. Build. Mater. 496 (2025) 143804]","authors":"Xinxin Ding ,&nbsp;Wenlei Jia ,&nbsp;Changyong Li ,&nbsp;Haibin Geng ,&nbsp;Gonglian Chen ,&nbsp;Shunbo Zhao","doi":"10.1016/j.conbuildmat.2026.145635","DOIUrl":"10.1016/j.conbuildmat.2026.145635","url":null,"abstract":"","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"516 ","pages":"Article 145635"},"PeriodicalIF":8.0,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387167","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":"Carbonation behavior and mechanical performance of low-carbon recycled concrete under different CO2 pressures","authors":"Hao Bao ,&nbsp;Jie Wang ,&nbsp;Gang Xu ,&nbsp;Ruyu Wang ,&nbsp;Mohamed Saafi ,&nbsp;Jianqiao Ye","doi":"10.1016/j.conbuildmat.2026.145684","DOIUrl":"10.1016/j.conbuildmat.2026.145684","url":null,"abstract":"<div><div>The construction industry faces challenges from high cement-related carbon emissions and construction waste. To address carbon reduction, sequestration, and waste utilization, accelerated carbonation tests were conducted on low-carbon recycled concrete (LCRC) to evaluate the effects of recycled aggregate (RA) replacement ratio of natural aggregate (NA), cement replacement ratio by ground granulated blast-furnace slag (GGBS), and external CO₂ pressure on carbonation depth and compressive strength. Microstructural analyses (SEM, EDX, MIP, and TGA-DSC) were conducted to analyze the microstructure, elemental distribution, pore structure, and compositional changes in LCRC before and after carbonation. Results showed that the LCRC carbonation depth increased and the compressive strength decreased with the increase of the RA and cement replacement ratios. The elevated external CO₂ pressure significantly accelerated carbonation, enhancing both carbonation depth and compressive strength. Under supercritical condition (7.5 MPa), the carbonation depth of the LCRC increased by an average of 164 % compared to samples at 0.1 MPa, while the average compressive strength was 47 % higher than that of the uncarbonated samples. Carbonation converts flocculent C-S-H gel into CaCO₃, refining the pore structure and reducing porosity by 28–34 %. Based on the TGA result difference inversion, a method for determining Ca(OH)₂ and C-S-H contents in LCRC was proposed, revealing pre-carbonation contents of 17–37 % and 63–83 %, respectively. The maximum carbon uptake capacity reached 96.09 kg CO₂/m³ of LCRC, highlighting its potential to support a low-carbon circular concrete industry.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"516 ","pages":"Article 145684"},"PeriodicalIF":8.0,"publicationDate":"2026-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387212","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}