Cement & concrete composites最新文献_第9页

Properties and sealing performance of an ultra high-durability cement mortar plug under simulated downhole conditions 模拟井下条件下超高耐久性水泥砂浆桥塞的性能与密封性能

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-11-27 DOI: 10.1016/j.cemconcomp.2025.106417

Ethan Yen, Bora Gencturk, Xiaoying Pan, Huanpeng Hong

{"title":"Properties and sealing performance of an ultra high-durability cement mortar plug under simulated downhole conditions","authors":"Ethan Yen, Bora Gencturk, Xiaoying Pan, Huanpeng Hong","doi":"10.1016/j.cemconcomp.2025.106417","DOIUrl":"10.1016/j.cemconcomp.2025.106417","url":null,"abstract":"<div><div>Methane leakage from abandoned oil and gas wells is driven by compromised sealing through the cement matrix and at cement–steel and cement–formation interfaces. This study evaluates an ultra high-durability cement mortar plug (UHD-CMP) designed to address the high shrinkage, low tensile strength, and poor interface bonding of conventional mortars under downhole conditions. Compressive strength, shrinkage, porosity, gas permeability, and interface bond strength were measured under five curing regimes simulating thermal and moisture exposures. Three shrinkage-reducing admixtures were assessed: magnesium oxide (MgO), calcium oxide (CaO)-based expansive agent, and a surfactant-based reducer (SRA). UHD-CMP achieved compressive strengths up to 162 MPa, more than twice that of conventional mortars, porosity reductions of up to 71 %, and bulk gas permeability as low as 3.98 × 10<sup>−20</sup> m<sup>2</sup>, up to five orders of magnitude lower than conventional mortars. Under prolonged moisture exposure at 70 % relative humidity, MgO- and SRA-modified UHD-CMP retained shear bond strengths of 1.5–2.3 MPa and 0.8–1.4 MPa, respectively, compared to 0.2 MPa or less for conventional mortars. Normal tensile bond strength was also significantly higher, with UHD-CMP maintaining approximately 0.44–0.46 MPa versus 0.09–0.11 MPa for conventional mortars under the same conditions. At elevated temperatures of 50–80 °C and 50 % relative humidity, shear bond strength decreased compared to standard curing but remained substantially higher than that of conventional mortars, which failed at 0.2 MPa or less. These results demonstrate UHD-CMP's potential for long-term sealing durability in well abandonment applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106417"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145611186","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}

引用次数: 0

A robust and predictive three-dimensional (3D) finite element (FE) model for evaluating the pullout behavior of steel fibers from a cementitious matrix 一个鲁棒和预测的三维（3D）有限元（FE）模型，用于评估钢纤维从胶凝基质中的拔出行为

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-11-21 DOI: 10.1016/j.cemconcomp.2025.106410

Wei-He Liu, Tao Yu

{"title":"A robust and predictive three-dimensional (3D) finite element (FE) model for evaluating the pullout behavior of steel fibers from a cementitious matrix","authors":"Wei-He Liu, Tao Yu","doi":"10.1016/j.cemconcomp.2025.106410","DOIUrl":"10.1016/j.cemconcomp.2025.106410","url":null,"abstract":"<div><div>Despite the extensive experimental and theoretical investigations on the pullout behavior of steel fibers from fiber-reinforced cementitious composites (FRCCs), the effects of the fiber clamping condition on the pullout behavior remain unclear. There is also a lack of rational assessment of the existing methods for evaluating the pullout behavior of steel fibers in FRCCs. This paper presents a simple, robust and predictive three-dimensional (3D) finite element (FE) model for elucidating these issues. Particularly, a modified Mohr-Coulomb (MMC) model was proposed to describe concrete spalling. A simple three-parameter cohesive-friction model was proposed to describe the fiber/matrix interfacial behavior. Having a low sensitivity to mesh size and a high meshing flexibility, the proposed FE model was computationally efficient. The robustness of the FE model was demonstrated by reproducing the experimental results from the literature covering both single-sided and double-sided pullout tests with a wide range of matrix strengths, fiber diameters and yield strengths, using only three physical fitting parameters (i.e., friction coefficient, confining pressure and cohesive strength). The numerical simulations showed that single-sided pullout tests overestimated the bond strength due to the unrealistic rigid-clamping conditions. Two-sided pullout tests with unequal fiber embedment lengths were preferable for resembling the action of fibers in cracked FRCCs. Traditional micromechanical models inappropriately evaluated the snubbing effect, as they predicted overly stiff bridging stress-crack opening (<span><math><mrow><msub><mi>σ</mi><mi>B</mi></msub><mo>−</mo><mi>w</mi></mrow></math></span>) curves and overestimated the peak stress. A novel analytical model was proposed which provided comparably accurate predictions of the <span><math><mrow><msub><mi>σ</mi><mi>B</mi></msub><mo>−</mo><mi>w</mi></mrow></math></span> curve with the FE simulations of two-sided pullout tests.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106410"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145567518","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}

引用次数: 0

Natural carbonation of concrete: a data-driven analysis 混凝土的自然碳化：数据驱动的分析

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.cemconcomp.2025.106436

T.C. Chan, M.H.N. Yio, H.S. Wong

{"title":"Natural carbonation of concrete: a data-driven analysis","authors":"T.C. Chan, M.H.N. Yio, H.S. Wong","doi":"10.1016/j.cemconcomp.2025.106436","DOIUrl":"10.1016/j.cemconcomp.2025.106436","url":null,"abstract":"<div><div>This study presents a data-driven analysis of long-term natural carbonation in concrete, using a newly compiled database comprising 1079 mixes and 8194 carbonation depth measurements over 65 years, representing one of the largest natural carbonation datasets assembled to date. Four different tree-based machine learning models (CatBoost, XGBoost, Random Forest and Decision Tree) were evaluated for predicting carbonation rate (<em>k</em>), with CatBoost emerging as the most effective. Partial dependence and SHAP analyses were used to quantify the relative importance of 13 features influencing <em>k</em>, including binder composition, mix proportion, curing and exposure conditions. The water-to-calcium oxide (w/CaO) ratio emerges as the most important feature, encapsulating the effects of porosity, carbonatable content, and supplementary cementitious material (SCM) type and content. Higher SCM replacement levels increase carbonation, while aggregate-related features show comparatively less pronounced effects. Carbonation environment is a more important feature than curing condition in predicting <em>k</em>. By combining machine learning with interpretable SHAP analysis, the model independently recognised trends consistent with literature findings. This study offers a comprehensive dataset and robustly selected features to facilitate future machine learning-based predictions of concrete carbonation.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106436"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689067","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}

引用次数: 0

Multiscale design and optimization of UHPC based on synergistic regulation of hydration activity, particle packing, and interfacial film 基于水化活性、颗粒堆积和界面膜协同调节的超高性能混凝土多尺度设计与优化

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-11-13 DOI: 10.1016/j.cemconcomp.2025.106393

Zhengxiang Mi , Yongjian Liu , Longbang Qing , Hongliang Zhang , Bo Zheng

{"title":"Multiscale design and optimization of UHPC based on synergistic regulation of hydration activity, particle packing, and interfacial film","authors":"Zhengxiang Mi , Yongjian Liu , Longbang Qing , Hongliang Zhang , Bo Zheng","doi":"10.1016/j.cemconcomp.2025.106393","DOIUrl":"10.1016/j.cemconcomp.2025.106393","url":null,"abstract":"<div><div>This study proposes a multi-scale mechanism-driven mix design method for ultra-high-performance concrete (UHPC), using water/paste film thickness (<em>t</em><sub>WFT</sub>/<em>t</em><sub>PFT</sub>) as a cross-scale control parameter. The approach integrates hydration regulation, particle packing optimization, and film-thickness control to precisely coordinate supplementary cementitious material replacement ratio, multi-level particle gradation (including binders and aggregates), and fiber dosage, enabling holistic optimization of UHPC workability, strength, dimensional stability, and resource efficiency. Multi-scale experimental validation (at paste, concrete, and composite levels) demonstrated that the quaternary system PB41-20, with a 38.7 % cement replacement, achieved the highest packing density, optimal workability, and a 28-day compressive strength of 104.5 MPa (26.1 % higher than the reference) through co-optimization of gradation and <em>t</em><sub>WFT</sub>. The optimal <em>t</em><sub>WFT</sub> and <em>t</em><sub>PFT</sub> were identified as 0.02 μm and 50 μm, respectively. Aggregate gradation optimization reduced paste demand by 5.2 %, while improving compressive and flexural strengths by 8.3 % and 5.9 %. The incorporation of coarse aggregates further reduced paste content and autogenous shrinkage by 11.6 % and 33.5 %, respectively, while maintaining strength. At a fiber volume fraction of 1.5 %, UHPC and CA-UHPC exhibited optimal overall performance, with compressive strengths of 165.8 MPa and 163.7 MPa, along with tensile performance enhanced by up to 64.2 %. The synergy between coarse aggregates and fibers significantly suppressed autogenous shrinkage, resulting in a 44.1 % reduction at 14 days.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106393"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145498723","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}

引用次数: 0

Effect of modified biochar on the immobilization of Pb2+ and CrO42− in cement-based materials 改性生物炭对水泥基材料中Pb2+和CrO42−固定化的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-11-13 DOI: 10.1016/j.cemconcomp.2025.106398

Binglin Guo , Di Lu , Ping Ye , Kaixuan Wang , Yuxing Gao , Huyong Qin , Yang Liu , Tongsheng Zhang , Lei Wang , Chuanzhen Wang , Binggen Zhan , Qijun Yu

{"title":"Effect of modified biochar on the immobilization of Pb2+ and CrO42− in cement-based materials","authors":"Binglin Guo , Di Lu , Ping Ye , Kaixuan Wang , Yuxing Gao , Huyong Qin , Yang Liu , Tongsheng Zhang , Lei Wang , Chuanzhen Wang , Binggen Zhan , Qijun Yu","doi":"10.1016/j.cemconcomp.2025.106398","DOIUrl":"10.1016/j.cemconcomp.2025.106398","url":null,"abstract":"<div><div>Cement-based solidification/stabilization (S/S) is widely used for the treatment of hazardous waste because it is a low-cost and straightforward process. However, the immobilization efficiency of traditional cement systems for amphoteric and anionic heavy metals is insufficient. Therefore, improving the immobilization ability of cement-based materials for amphoteric and anionic heavy metal pollutants is the key focus of current research. Herein, we innovatively increased the adsorption capacity of anions using quaternary ammonium group-functionalized modified biochar and systematically investigated the adsorption mechanism of modified biochar for Pb<sup>2+</sup> and CrO<sub>4</sub><sup>2−</sup> under the alkaline conditions. Modified biochar was further incorporated into the cement matrix to evaluate its immobilization efficiency for Pb<sup>2+</sup> and CrO<sub>4</sub><sup>2−</sup> and its effect on the properties of cement-based materials. Results showed that the substitution of quaternized biochar reduced the leaching concentrations of Pb<sup>2+</sup> and CrO<sub>4</sub><sup>2−</sup> due to the positive charge of quaternized biochar under strong alkaline conditions, which reduced the electrostatic repulsion between anions and facilitated the adsorption of more heavy metal ions. Furthermore, due to the microfilling, internal curing, and hydration nucleation effects of biochar, biochar substitution improved the compressive strength of cement and the formation of hydration products. This study proposes a new strategy for preparing biochar–cement composite immobilization materials to address the bottleneck in cement-based S/S technology.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106398"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145508990","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}

引用次数: 0

Influence of limestone calcined clay on the mechanical behaviour of 3D printed engineered cementitious composites 石灰石煅烧粘土对3D打印工程胶凝复合材料力学性能的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-10-17 DOI: 10.1016/j.cemconcomp.2025.106366

Yuting Wang , Meng Chen , Tong Zhang , Mingzhong Zhang

{"title":"Influence of limestone calcined clay on the mechanical behaviour of 3D printed engineered cementitious composites","authors":"Yuting Wang , Meng Chen , Tong Zhang , Mingzhong Zhang","doi":"10.1016/j.cemconcomp.2025.106366","DOIUrl":"10.1016/j.cemconcomp.2025.106366","url":null,"abstract":"<div><div>Utilisation of engineered cementitious composites (ECC) for additive manufacturing can help improve the toughness and deformability of printed structures, while it is vital to further enhance its sustainability for engineering applications. In this study, limestone calcined clay was adopted as an alternative low-carbon binder to cement at replacement levels of 0, 30 % 45 % and 60 % for 3D printed ECC. The mechanical properties of printed ECC based on limestone calcined clay cement (LC<sup>3</sup>) were systematically investigated. Results reveal that the tensile strength of printed ECC dropped but the strain capacity raised with increasing limestone calcined clay substitution. All printed LC<sup>3</sup> based ECC exhibited strain hardening behaviour and have a tensile strain of over 2 %. The compressive and flexural strengths of cast specimens declined with increasing limestone calcined clay content, while the strengths of printed counterparts improved when loaded in individual printed directions. Interlayer bonding strength of the printed LC<sup>3</sup> based ECC in the horizontal direction reduced by 3.58 %–8.32 % while that in the vertical direction raised by 5.69 %–9.64 % than strengths of printed ordinary ECC. Fracture toughness of printed ECC significantly decreased with increasing limestone calcined clay substitution. Nevertheless, the interlayer fracture toughness of printed LC<sup>3</sup> based ECC achieved 65 % of the internal fracture toughness, where the bridging effect of fibres embedded in the interlayer resulted in an enhancement of interfacial performance. Overall, the printed ECC showed desirable mechanical properties due to the enhancement of ductility and interlayer bonding behaviour when the substitution of limestone calcined clay is below 45 %.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106366"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145306245","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}

引用次数: 0

Effect of hydroxysodalite on the alkali-activated slag of seawater mixture: Early hydration behavior, chloride binding capacity, and microstructural characteristics 羟基水晶石对海水碱活性渣的早期水化行为、氯离子结合力及微观结构特征的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-10-28 DOI: 10.1016/j.cemconcomp.2025.106380

Wenyang Zhang , Yuan Fang , Dapeng Zheng , Haibin Yang , Xiangpeng Cao , Le Shuai , Kunde Zhuang , Feng Xing

{"title":"Effect of hydroxysodalite on the alkali-activated slag of seawater mixture: Early hydration behavior, chloride binding capacity, and microstructural characteristics","authors":"Wenyang Zhang , Yuan Fang , Dapeng Zheng , Haibin Yang , Xiangpeng Cao , Le Shuai , Kunde Zhuang , Feng Xing","doi":"10.1016/j.cemconcomp.2025.106380","DOIUrl":"10.1016/j.cemconcomp.2025.106380","url":null,"abstract":"<div><div>In response to the scarcity of freshwater resources and the high environmental impact of cement production, this research explores the use of seawater to prepare alkali-activated cementitious materials (AAMs). To avoid the adverse effects of high concentrations of Cl<sup>−</sup> in seawater on performance, the feasibility of synergistic application of hydroxysodalite and seawater in AAMs systems was proposed. By setting the hydroxysodalite content and mixing water type, the effects on the early hydration behavior, Cl<sup>−</sup> binding capacity, and microstructural characteristics of AAMs were systematically investigated. The results show that hydroxysodalite improves the initial flowability (8 %–14 %) while shortening the setting time (initial setting and final setting are shortened by 32 %–40 % and 26 %–33 %, respectively). Compared with the deionized water mixing system without hydroxysodalite, hydroxysodalite increased the compressive strength of the seawater mixing system by 17.2 %. Seawater causes OH<sup>−</sup> in hydroxysodalite to migrate out of the β cage, and induces the formation of chlorine-bearing sodalite. At the same time, hydroxysodalite promotes the formation of more C-A-S-H gel, which not only reduces the total porosity but also increases the gel pore ratio. The synergistic effect of these two aspects significantly enhances the chloride ion binding capacity of AAMs. In addition, the binding behavior of AAMs towards Cl<sup>−</sup> follows the Freundlich model. Overall, the introduction of hydroxysodalite provides an effective strategy for significantly improving the early performance and Cl<sup>−</sup> binding capacity of AAMs mixed with seawater.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106380"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145383458","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}

引用次数: 0

Elucidating the effect of modulus of sodium silicate on microstructural and mechanical properties of alkali activated slag pastes 研究了水玻璃模量对碱活性矿渣膏微观结构和力学性能的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-11-28 DOI: 10.1016/j.cemconcomp.2025.106415

Dongdong Jiang , Zuhua Zhang , Genshen Li , Caijun Shi

{"title":"Elucidating the effect of modulus of sodium silicate on microstructural and mechanical properties of alkali activated slag pastes","authors":"Dongdong Jiang , Zuhua Zhang , Genshen Li , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106415","DOIUrl":"10.1016/j.cemconcomp.2025.106415","url":null,"abstract":"<div><div>The modulus (Ms) of sodium silicate solution has both qualitative and quantitative effects on the reaction products formed in alkali activated slag (AAS) pastes, primarily consisting of C-(N)-A-S-H gels and hydrotalcite phases. Various intrinsic characteristics of these reaction products exhibit significant variations as a function of Ms, such as the chemistry of both pure phases, as well as the nanostructure and morphology of gel phases. Moreover, the volume fraction of reaction products, identified as the first-order parameter explaining the compressive strength of AAS pastes, is synergistically affected by the reaction degree of slag particles and the solid-phase quantity transformed from soluble silicate species supplied by sodium silicate solution. Specifically, the silicon content supplied by sodium silicate solution at Ms of 2 is comparable to the dissolved silicon content as the reaction degree of slag particles reaches ∼36 %. In addition, the inner products of AAS pastes exhibit superior micromechanical properties, primarily due to the enrichment of hydrotalcite phases rather than contributions from the solid skeleton of gel phases. Their relative proportion within reaction products exerts more significant influence on the compressive strength of AAS pastes than the reaction degree of slag particles.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106415"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145611617","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}

引用次数: 0

Passivation and chloride-induced corrosion behavior of Zn-Al coated steel in belitic calcium sulfoaluminate cement system 锌铝包覆钢在贝氏体硫铝酸钙水泥体系中的钝化和氯化物腐蚀行为

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-11-12 DOI: 10.1016/j.cemconcomp.2025.106397

Jinjie Shi , Wenxuan Li , Xinhao Bi

{"title":"Passivation and chloride-induced corrosion behavior of Zn-Al coated steel in belitic calcium sulfoaluminate cement system","authors":"Jinjie Shi , Wenxuan Li , Xinhao Bi","doi":"10.1016/j.cemconcomp.2025.106397","DOIUrl":"10.1016/j.cemconcomp.2025.106397","url":null,"abstract":"<div><div>As one of the low-carbon alternatives to ordinary Portland cement (OPC), belitic calcium sulfoaluminate (BCSA) cement has several benefits, such as rapid strength gain, low shrinkage and high durability. However, insufficient passivity was achieved for steel in BCSA cement due to its low alkalinity and high sulfates content. Despite the fact that these features are detrimental to the passivity of carbon steel, it should be underlined that the low-alkaline pore solutions of BCSA cement may prevent the dissolution of galvanized coating for galvanized steel, implying that galvanized steel may exhibit superior corrosion resistance when embedded in BCSA cement compared to OPC. To verify this hypothesis, the passivation behavior and chloride resistance were investigated for a Zn-Al coated steel in the OPC-BCSA blended system (abbreviated as PSA), including extract solutions and mortars, using electrochemical tests and microstructural characterization methods. The results indicate that the Zn-Al coated steel shows comparable passivation behavior in OPC and PSA systems, though it performs slightly differently in extract solutions and mortars. Nevertheless, compared to the OPC solution, improved chloride resistance is observed for the Zn-Al coated steel in the PSA solution, which is largely attributed to the presence of a stable retained Zn-Al coating. Furthermore, owing to the formation of a more compact steel-mortar interface, the enhanced corrosion resistance is more pronounced for the Zn-Al coated steel in the PSA mortar with the <em>R</em><sub>c</sub> + <em>R</em><sub>ct</sub> value of 351.0 kΩ cm<sup>2</sup>, which is remarkably higher than that in the OPC mortar (9.2 kΩ cm<sup>2</sup>) after long-term chloride attack.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106397"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145498728","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}

引用次数: 0

Carbonation resistance of low-carbon mortar blended with belitic calcium sulfoaluminate (BCSA) cement and its impact on initial corrosion of steel 低碳砂浆与贝氏体硫铝酸钙（BCSA）水泥的抗碳化性能及其对钢初腐蚀的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-02-01 Epub Date: 2025-11-13 DOI: 10.1016/j.cemconcomp.2025.106399

Zhi Geng, Jinjie Shi

{"title":"Carbonation resistance of low-carbon mortar blended with belitic calcium sulfoaluminate (BCSA) cement and its impact on initial corrosion of steel","authors":"Zhi Geng, Jinjie Shi","doi":"10.1016/j.cemconcomp.2025.106399","DOIUrl":"10.1016/j.cemconcomp.2025.106399","url":null,"abstract":"<div><div>The blend of ordinary Portland cement (OPC) and calcium sulfoaluminate (CSA) cement has been well-established as a promising low-carbon binder in terms of matrix properties. However, the application in reinforced structures raises questions regarding its protective ability for the embedded steel, particularly concerning corrosion performance in carbonation environments. This study aims to evaluate the carbonation resistance of OPC-CSA blended mortar and investigate the related corrosion behavior of the embedded steel upon accelerated carbonation. The experimental findings indicate that, compared to OPC mortar, the reinforced blended mortar exhibited a deeper carbonation depth in the mortar matrix and a comparable corrosion rate of the embedded steel throughout the carbonation process. Although the OPC-CSA blended mortar showed higher overall porosity before and after carbonation compared to OPC mortar, the lower pore volume in the diameter range larger than tens of nanometers confirmed the finer pore size distribution of the blended mortar. Despite the negligible corrosion rates of the embedded steel, consistently below 0.1 μA cm<sup>−2</sup> for both mortars during the carbonation process, the characteristic of steel-mortar interface was found to influence the initial formation of corrosion stains.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"166 ","pages":"Article 106399"},"PeriodicalIF":13.1,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145509131","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}

引用次数: 0