The determination and evaluation of severity rating of soil is an important part of the research on the engineering properties of water‐repellent soil. It is still difficult to accurately obtain the soil water‐repelling rate in essence, and there are a lot of influencing factors. In this paper, the severity rating of sandy soil hydrophobized by dichlorodimethylsilane (DMDCS) was obtained by different water‐repellent detection reagents. The change laws and influencing factors of drop penetration time were obtained. It is shown that the change laws of drop penetration time of sandy soil detected by water‐insoluble organic matters, acid, alkali, salt, and strong oxidants were similar to the water’s, which are not considered to be the water‐repellent detection reagents. The water drop penetration time (WDPT) of sandy soil by glutaraldehyde solution is much less than the water’s. Moreover, the detection sensitivity is enhanced and the accuracy is improved. The detection standard and evaluation system of glutaraldehyde drop penetration time (GDPT) method are put forward accordingly. In this new system, “moderate‐strong,” “strong,” and “serious” are added to perfect the system of water‐repelling rate. The study will be helpful to improve the existed evaluation system of water‐repelling rate.
Yu et al. (Thu,) studied this question.