The Improvement of Selected Material Types A and B Using Latex Type HA60 and Cement to Study the California Bearing Ratio (CBR)

Abstract

The objective of this research is to study the engineering properties California bearing ratio (CBR) and permeability, of the improvement of selected material types A and B, conforming to Highway Department of Thailand specifications, using latex type HA60 and cement. Firstly, selected materials were mixed with latex in proportions of 10%, 15%, 20%, 25%, and 30% by weight to obtain the optimum latex proportion by considering the CRB value. Secondly cement in proportions of 2%, 4%, 6%, and 8% by weight was mixed with improved materials from the first. The research results show that the selected materials type A, mix with 15% of latex and 2% of cement provides the highest CBR value. For improved selected material type B, 20% of latex and 4% of cement provides the highest CBR value. According to the permeability test results, the coefficient of permeability of improved selected materials tends to decrease due to the increasing amount of latex and cement.