Insights on chloride binding in blended cement pastes containing recycled brick powder

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-09-29 DOI:10.1016/j.conbuildmat.2025.143778

Gaofeng Chen , Jianming Gao , Cheng Liu , Huixia Wu , Zhaoheng Guo , Yasong Zhao , Zhenhai Xu , Shujun Li

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Abstract

Understanding chloride binding in cement pastes is critical for mitigating steel corrosion and enhancing the durability of concrete structures. This study investigated the chloride binding behavior of blended cement pastes containing recycled brick powder (RBP) under NaCl and MgCl₂ exposure by testing chloride binding isotherms, pH change, phase assemblages, and C-(A)-S-H nanostructure. Results show that RBP alters chloride binding through both chemical formation of Friedel's salt and physical adsorption by C-(A)-S-H gels. An optimal RBP dosage of 15 % maximizes chloride binding capacity. MgCl₂ promotes greater chloride binding than NaCl, due to enhanced Friedel's salt formation in lower pH and improved physical adsorption. Nanostructure analysis reveals that 15 % RBP enhances C-(A)-S-H polymerization and Al/Si ratio, optimizing surface charge for chloride adsorption. Furthermore, thermodynamic modelling corroborates Friedel's salt dominance in MgCl₂ systems and RBP's role in enriching AFm phases.

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含再生砖粉混合水泥浆中氯离子结合的研究

了解氯离子在水泥浆中的结合对减轻钢铁腐蚀和提高混凝土结构的耐久性至关重要。本研究通过测试氯离子结合等温线、pH变化、相组合和C-(A)- s - h纳米结构，研究了含再生砖粉（RBP）的水泥浆在NaCl和MgCl2环境下的氯离子结合行为。结果表明，RBP通过弗里德尔盐的化学形成和C-(A)- s - h凝胶的物理吸附改变了氯离子的结合。最佳RBP用量为15% %，可使氯化物结合能力最大化。与NaCl相比，MgCl2促进了更大的氯化物结合，这是由于在较低pH下增强了弗里德尔盐的形成，并改善了物理吸附。纳米结构分析表明，15 % RBP增强了C-(A)- s - h聚合和Al/Si比，优化了氯离子吸附的表面电荷。此外，热力学模型证实了MgCl2体系中的Friedel盐优势和RBP在富集AFm相中的作用。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.