Experimental Study on Physical Properties of Octadecylamine Modified Expansive Soil

Abstract

Taking weak expansive soil as the research object, octadecyl primary amine (octadecylamine) was mixed into remolded expansive soil as a water repellent, and modified samples with different octadecylamine content were configured. The water-repellent grade of the modified expansive soil was measured by the dripping water penetration time method, the boundary moisture content test of the modified expansive soil was carried out, and the change law of the liquid plastic limit of the modified expansive soil with different octadecylamine content was analyzed. The results show that with the increase of the octadecylamine content, the liquid limit of the expansive soil gradually decreases, the plastic limit gradually increases, and the plasticity index gradually decreases. The above research results can provide a test basis for the engineering application of modified expansive soils.