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采用一种非稳态氯离子扩散试验方法,研究了集料的粒径分布和体积掺量对氯离子在水泥基材料中传输性质的影响,并利用扫描电子显微镜–能谱仪对水化产物中Ca/Si分析,确定集料对氯离子在水泥基材料中结合能力的影响。结果表明:集料的掺入可以改变水泥基材料的孔结构和氯离子在其中的传输过程;提高集料体积掺量,或在体积掺量不变情况下降低集料粒径,会增加相应界面过渡区体积含量,并进一步影响氯离子传输过程;在高集料体积掺量或较小粒径分布条件下,界面过渡区对氯离子传输的增加效应,将大于由集料稀释效应和迂曲度增加而对氯离子传输的改善效果。此外,随着集料含量增加,水泥基材料对氯离子结合能力也有所提升。
A non-steady-state chloride ion diffusion test was used to study the influence of particle size distribution and volume content of aggregates on the transport properties of chloride ions in cement-based materials. The hydration products Medium Ca / Si analysis to determine the effect of aggregates on the binding capacity of chloride ions in cement-based materials. The results show that the incorporation of aggregates can change the pore structure of cement-based materials and the transport of chloride ions in them. Increasing the volumetric volume of aggregates or decreasing the aggregates particle size will increase the volume of aggregates, Interface transition zone volume content, and further affect the chloride ion transport process; in high aggregate volume content or smaller particle size distribution, the interface transition zone of chloride ion transport increased effect will be greater than the dilution effect by the aggregate and tortuous Increase the degree of improvement of chloride ion transmission. In addition, cement-based materials also have an increased ability to bind chloride as the aggregate content increases.