Experimental Study on Composite Materials for Solidified Red Clay Used for Subgrade Filling

In order to solve a series of highway diseases caused by poor water stability, insufficient strength, large deformation and obvious expansion and contraction in Guizhou Red Clay Subgrade Project. This paper takes the undisturbed red clay of a highway subgrade in Guizhou as the test material, improves the red clay by using the curing agent, and carries out the indoor test by adding different content of curing agent into the natural red clay The hydraulic properties and mechanical strength characteristics of the modified red clay were studied. Combined with the construction and detection of the field test section, the scientific evaluation of the red clay composite material was carried out. The results show that: with the increase of curing agent, the liquid plastic limited water content moves to different directions, the soil resistance to water damage is enhanced, and the expansion and contraction characteristics are effectively controlled. Moreover, the unconfined compressive strength, bearing capacity and resilient modulus of the modified red clay are significantly improved, which can be compensated the engineering defects of red clay can improve the quality of highway engineering and extend the service life. At the same time, through the test section for field test results analysis, the strength index of red clay composite cured soil to meet the engineering design standards.