泥炭(质)土环境下水泥土复合体腐蚀软化试验研究

置换式水泥土复合体在泥炭土软基地区被广泛使用,泥炭土中含有大量腐殖酸,导致水泥土性能劣化,从而对工程安全造成严重影响.为研究腐殖酸对水泥土复合体的腐蚀劣化影响及其腐蚀机理,配制多组不同pH值的富里酸溶液模拟泥炭土腐蚀环境,将水泥土试样置于酸溶液中浸泡.本试验尝试性的引入腐蚀软化深度作为观测指标,通过简易的软化深度测量装置收集数据并分析其腐蚀机理.研究结果表明,富里酸对水泥土复合体具有腐蚀软化作用;随酸性的增强与酸溶液浸泡时间的增长腐蚀软化深度随之增加.本试验可为实际工程中桩体受腐蚀影响导致半径缩减,为单桩承载力下降预测提供一定参考借鉴.

Experimental Study on Corrosion Softening of Cement-soil Composites under Peat Soil Environment

The replacement type cement-soil complex is widely used in the soft soil of peat soil,and the peat soil contains a lot of humic acid,which leads to the deterioration of cement soil performance,and has serious impact on the safety of the project. In order to study the effect of humic acid on the corrosion and corrosion of cement-soil composites and the mechanism of corrosion,a series of fulvic acid solutions with different pH values were prepared to simulate the soil corrosion environment. The cement soil samples were immersed in acid solution. In this experiment,the erosion softening depth was introduced as the observation index,and the corrosion mechanism was collected by simple softening depth measuring device. The results show that fulvic acid has corrosive and softening effect on cement-soil composites, and the softening depth increases with the increase of acidity and immersion time. This experiment can lead to the reduction of the radius caused by the corrosion of the pile in the actual project,and provide some reference for the prediction of the bearing capacity of the single pile.