【摘要】 为解决钢筋混凝土氯离子侵蚀难题，研究了不同掺量矿渣微粉对水泥净浆工作性能、力学性能和氯离子固化性能的影响，并通过物相分析、热重分析、孔结构分布和热力学模拟等方法对氯离子固化机理进行表征分析。结果表明：矿渣微粉能够改善水泥基材料的工作性能，有效提升水泥净浆后期抗压强度和氯离子固化能力，掺量为30%(质量分数)时综合性能最佳；矿渣微粉能够化学结合氯离子，促进体系生成Friedel盐和Kuzel盐，并且能够发生火山灰效应提升C-S-H凝胶含量，细化硬化浆体孔隙结构，提升密实度；水泥净浆氯离子固化能力受氯离子化学结合、物理吸附和阻迁能力共同作用，随着矿渣微粉掺量增加，水泥净浆氯离子化学结合和物理吸附能力逐渐增强，而阻迁能力存在最优掺量。本研究为矿渣微粉水泥基材料在远海岛礁工程建设中的应用提供技术支持和理论支撑。更多还原

【Abstract】 In order to solve the problem of chloride erosion in reinforced concrete, the effects of different dosages of ground granulated blast furance slag(GGBS) on working performance, mechanical properties and chloride binding capacity of cement paste were studied, and the chloride binding mechanism was characterized and analyzed by phase composition, thermogravimetric analysis, pore structure distribution and thermodynamic simulation. The results show that the GGBS can improve the working performance of cement-based materials, and effectively improve the compressive strength and chloride binding capacity of cement paste at the later stage. The comprehensive performance is the best when the GGBS content is 30%(mass fraction). The GGBS can chemically combine with chloride ions to promote the formation of Friedel’s salt and Kuzel’s salt, and the pozzolanic effect can increase the content of C-S-H and refine the pore structure of hardened slurry to improve the compactness. The chloride binding capacity of the cement paste with GGBS is affected by the chemical binding, physical adsorption and migration resistance of chloride ions. With the increase of the content of GGBS, the chloride chemical binding and physical adsorption ability of the cement paste gradually increase, and there is an optimal content of GGBS for migration resistance. This study provides technical and theoretical support for using GGBS cement based materials in offshore islands.更多还原