【摘要】 由于混凝土结构耐久性评估和设计的需要，必须通过试验和理论分析来确定水泥基材料的氯离子扩散系数。采用试验方法分析了掺合料水泥浆氯离子扩散的基本特性，在所测的水泥浆试件中，掺合料总量固定为40%,粉煤灰和矿渣的质量比分别为1∶3,2∶2,3∶1。此外，还设计了一组普通水泥浆作为对比。基于测试结果，评价了各设计变量对水泥浆氯离子扩散系数的相对贡献。研究结果表明：粉煤灰和矿渣可以大大减小水泥浆氯离子扩散系数；减小水胶比或增大养护龄期均能有效地提升抗氯离子渗透性；对于养护龄期或水胶比较大的水泥浆，粉煤灰比矿渣更有效。更多还原

【Abstract】 Owing to the need for the durability assessment and design of concrete structures, it is essential to determine the chloride diffusivity of cementitious materials by experiment and theoretial analysis. The basic characteristics of chloride diffusion in cement paste with mineral admixtures are analyzed through experimental method. In the cement paste specimens measured, the total admixture content is fixed as 40% and the ratios between fly ash and slag are 1∶3, 2∶2 and 3∶1, respectively. In addition, an ordinary cement paste is designed as a comparison. Based on the test results, the relative contributions of various design variables to the chloride diffusivity of cement paste are evaluated. The research results show that both fly ash and slag can greatly reduce the chloride diffusivity of cement paste. Decreasing the water/binder ratio or increasing the curing age can effectively improve the resistance to chloride ion penetration. For cement paste with larger curing ages or water/binder ratios, fly ash is more efficient than slag.更多还原