水泥基天然火山岩粉胶凝体系胶砂试件抗硫酸盐侵蚀试验研究

摘要

制做不同掺合料(新疆和田地区磨细火山岩粉、Ⅱ级粉煤灰、硅粉、水泥)组合的水泥胶砂试件,通过不同胶凝体系、掺量、龄期及侵蚀介质浓度的正交试验,采用浸泡法(K法)对不同胶凝体系的水泥基胶砂试件的抗硫酸盐侵蚀性能进行研究,分析火山岩粉掺量对水泥基胶凝体抗硫酸盐侵蚀影响.根据试件微观水化产物类型分析和宏观力学性能变化结果可知:粉煤灰+水泥>火山岩粉+水泥>纯水泥;由于火山岩粉活性较粉煤灰低,其抑制硫酸盐侵蚀的能力略弱于粉煤灰,但随着火山岩粉掺量的增加,其抗侵蚀能力也逐渐增强.%This project aims to study the sulfate attack of cement mortar specimens combined from fine grinding volcanic rock from Hotan region of Xinjiang,grade Ⅱ powder coal,silicon powder and cement) through the immersion test (K method) by orthogonal test of different gelled systems,dosage,age and concentration of erosion medium.Meanwhile,the effect of the amount of volcanic rock powder on sulfate resistance of cement based cement paste is analyzed,too.Based on the analysis of the types of micro hydration products and the change of macro mechanical properties, the results demonstrated fly ash cement>volcanic rock powder+cement>pure cement.Because the activity of volcanic rock powder was lower than that of fly ash,its ability to restrain sulfate attack was slightly weaker than that of fly ash.But with the increase of the amount of volcanic rock powder, the ability to resist erosion gradually increased.