Dispersive Soil Stabilization Using Biopolymers, Bioenzymes, Additives as a Subgrade Material: A Review Paper

Abstract

The overall performance of pavement is dependent on the subgrade soil type and its properties. Soil stabilization has always been a substantial concern in construction of highways. In situ soil remoulding is an essential criterion to enhance the fundamental engineering properties of subgrade and to meet the standards of road construction. Various stabilization techniques are utilized to annihilate the inadequate properties of sub-grade soils. Principally, traditionally used soil stabilizers like lime, cement, bitumen, etc. and combinations of these have been utilized widely to enhance the properties of problematic soil. These traditionally soil stabilizers are uneconomical and use of gravel or sand to enrich soil properties are depleting. This scenario has led to lots of researches in order to identify and introduce cost efficient and eco-friendly materials, in particular, different types of inorganic to organic stabilizers have been experimented at laboratory level and also in field level in order to scrutinize their suitability as soil stabilizer. This paper elaborates the various research conducted on enhancing sub-grade of the road by stabilizing dispersive soil with biopolymers, bioenzymes, and additives. These stabilizers are environmentally friendly and a cost-effective alternative to traditionally soil stabilizers.