Preparation method of modified medium expansive soil for highway subgrade

Abstract

The invention relates to a preparation method of modified medium expansive soil for a highway subgrade, and belongs to the technical field of highway engineering. The method comprises the following steps: determining a design mass mixing ratio, converting the design mass mixing ratio into a construction mass mixing ratio, mixing raw materials to obtain a batch, crushing / mixing the batch to obtain a mixture, stacking the mixture for modification to obtain a modified material, namely the modified medium expansive soil, and performing moisture content and secondary compaction test on the modified medium expansive soil to obtain the medium expansive soil. And the water content of the modified expansive soil is adjusted to a construction water content control range, so that the modified expansive soil meets the requirements of building a highway subgrade. According to the method, ecological damage, resource waste and environment pollution are avoided, meanwhile, the cost is reduced, the modification speed of the medium expansive soil is greatly increased, and the construction water content control range and the compaction degree calculation standard of the modified medium expansive soil used for building the highway subgrade are scientifically determined.

Images