Abstract
This study is intended to increase the compressive strength and durability of subgrade with lime, on high plasticity expansive soil. The composition of the stabilizing agent used; composition-1 is soil + 5% slakelime, composition-2 is soil + 5% quicklime, and composition-3 is soil + 5% (quicklime with rosin and iron oxide activation). The testing includes swelling test, durability test, and CBR test. That the performance of stabilization with the composition-3 was able to reduce the swelling potential on 3th day by 93.89%, decrease the volume increase potential by 93.09% and decrease the weight increase potential by 94.00% in the 3 periods of wet-dry cycle, and increase the CBR value by 758.62%. That the activation of gum rosin and iron oxide on quicklime can significantly improve the performance of lime for stabilization of expansive clay as subgrade of highway.
Highlights
The pavement on the highway should be built on the subgrade with sufficient compressive strength and low shrinkage, on the subgrade of expansive soil is required a stabilization.Soil stabilization can be prepared by mechanical and chemical means
Previous research states that: In the clay with lime stabilization was identified that the pure argillite underwent a slight decrease in its cohesion due to do dissolution of its clayey particles [1]
For each soil mixture carried out wet-dry cycles 1 period, 2 period, and 3 period. 1 period is 1 time aerated for 4 days and 1 time soaked for 4 days
Summary
The pavement on the highway should be built on the subgrade with sufficient compressive strength and low shrinkage, on the subgrade of expansive soil is required a stabilization.Soil stabilization can be prepared by mechanical and chemical means. Mechanical stabilization is made by to mixing other soils gradation to improve the structure and technical properties (engineering properties). Chemical stabilization is made by adding certain chemicals to improve cohesion inter the gradation and provide resistance to water and other harmful chemicals. Such treatment improves soil compressibility, but lime stabilization has a number of inherent disadvantages, such as carbonation, sulfate attack, and environment impact [3]
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