关键词: 富里酸;水泥土;浸泡试验;腐蚀软化深度;腐蚀机理

Abstract: 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.

Key words: fulvic acid;cement-soil;immersion test;corrosion softening depth;corrosion mechanism