Effect of Addition of Palm Shell Ash and Asphalt Emulsion For Bearing Capacity on Clay Soils
Morin Morissa Lumbantoruan (a*), Syahril (b)

(a) Applied Civil Engineering Master Program, Politeknik Negeri Bandung, Jl. Gegerkalong Hilir, Ds.Ciwaruga, Bandung 40559, Indonesia.
*morin.rissa[at]yahoo.com

(b)Civil Engineering Department, Politeknik Negeri Bandung, Jl. Gegerkalong Hilir, Ds.Ciwaruga, Bandung 40559, Indonesia.

Abstract

Soil stabilization is a method to improve soil properties either by mechanical means or by adding another material to the soil with the purpose is to increase the strength or bearing capacity of the subgrade to the construction built on it. Subgrade with low bearing capacity can cause damage or collapse of construction above it. In this study, the type of stabilized soil is clay. Repairing this subgrade by adding addictive material to the clay using palm shell ash and asphalt emulsion with 8% of palm shell ash content as a dependent variable and emulsion asphalt of 3%, 6%, 9%, and 12% as an independent variable. The purpose of this step is to get the optimum mixture content as a stabilizing agent. Based on testing, the optimum mixture content is 8% palm shell ash+9% emulsion asphalt. The addition of this addictive material can reduce water content by 9.03%, plastic index by 74.47%, and shrinkage by 56.38% during the 14 days curing period, and increase the bearing capacity of subgrade through CBR testing of unsoaked and soaked respectively each of 114.15% during the curing period of 14 days and 211.1% during soaking of 14 days.

Keywords: Stabilization; Palm Shell Ash; Asphalt Emulsion

Topic: Civil Engineering