R-Value Test Modification

摘要

The purpose of this research study is to determine the feasibility of modifying the Standard R-Value test. Moisture content of subgrade material sampled under existing pavements was compared to the moisture content of same material at 300 p.s.i. exudation pressure. Although the average moisture values at 300 p.s.i. exudation were higher, there were enough individual exceptions which would preclude changing the Standard R-Value test. A modified test, based on uniform compactive effort at three different moisture contents, was developed to afford flexibility for particular environmental conditions. Soil suction test results on potentially swelling soils were encouraging, but further research is needed to establish a standard method.