不同矿渣掺量水泥基材料表面接触性溶蚀试验

摘要

The soluble components in cement-based material could be dissolved by deionized water, which can change the microstructure of the cement-based material and then affect its durability.Laboratory experiment was conducted to study the contact corrosion of cement-based material with different contents of slag in deionized water.Through experimental data, the electrical conductivity and the maximum values in each period were obtained, and the TDS of corrosion solution at different time were predicted.Then through the relationship between calcium concentration and electrical conductivity, the dissolved calcium quantity in the future period was derived.Combining with the mathematical equation of calcium concentration, electrical conductivity and TDS of corrosion solution, it shows that the higher the content of slag in cement-based specimen, the stronger resistance to surface contact corrosion under low water-solid ratio.%水泥基材料中的可溶性组分可在去离子水的作用下发生溶解,使得材料细观结构等发生改变,进而影响其耐久性.通过室内试验,研究不同矿渣掺量的水泥基材料在去离子水作用下接触性溶蚀特征.通过拟合,得出各周期内电导率值及最大值,并预测不同时刻各类试件侵蚀溶液的矿化度;再通过建立电导率和Ca2+浓度关系,预测未来周期内Ca2+浓度溶出量.结合电导率、侵蚀液的矿化度及Ca2+浓度变化的数学方程,揭示了在水固比较低条件下,矿渣含量越高的水泥基试件,其抗表面接触性溶蚀越强的规律.