MOISTURE MOVEMENT UNDER THE PAVEMENT STRUCTURE. VOLUMES 1 AND 2. RESEARCH REPORT

One of the measures being tried in Texas to stabilize the development of roughness of pavements on expansive soils is the installation of vertical moisture barriers. The purpose of the barrier is to prevent subsurface water from accessing into the crack fabric within the subgrade soils. Several sites throughout Texas have been already monitored and some conflicting results have been observed. In some cases, the moisture barrier seems to reduce considerably the rate at which roughness develops but, in other cases, the barrier has somewhat increased the rate of roughness development. The main purpose of the study was to assemble a computer program that would predict the behavior of different barrier alternatives.