Experimental Study on the Durability of Red Clay Modified by Plant Fiber

In order to study the influence of time on the mechanical properties of red clay improved by plant fiber, the red clay in Guilin was taken as the research object. Three kinds of plant fibers, lignin, coir and ramie, were mixed into red clay respectively. The shear strength index and unconfined compressive strength of red clay improved by plant fibers at different curing ages were analyzed through indoor direct shear test and unconfined compressive strength test. The test results show that the shear strength index and unconfined compressive strength of red clay improved by plant fiber decrease with the increase of curing age. The effect of ramie on improving the mechanical properties of red clay is worse than that of coir on improving the mechanical properties of red clay, but its durability is better than that of coir on improving red clay. Lignin has the worst effect in improving the mechanical properties of red clay and has poor durability. When considering the durability of plant fiber improved red clay in engineering, ramie can be used as the optimal plant fiber to improve red clay. The above research results are of great significance in providing reference for engineering construction and red clay improvement in red clay areas.