STRENGTH ASSESSMENT OF CEMENT TREATED SOIL- RECLAIMED ASPHALT PAVEMENT (RAP) MIXTURE

Abstract

The article attempts to present the influence of reclaimed asphalt pavement (RAP) content on the
compaction behavior and unconfined compressive strength of cement treated soil-RAP mixture. The laboratory
compaction and unconfined compression tests on cement treated soil-RAP mixture were carried out with various
RAP and cement contents. The porosity was adopted as a state parameter for assessing the strength of the mixed
materials. The results show that with an increase in RAP content, the OMC tends to decrease, up to the optimum
of soil/RAP ratio of 50/50. The asphalt fixation point is designated as a transitional point where a small change
in strength turns to a larger change. An asphalt content of 3.5% (50/50 soil/RAP ratio) is found to be the asphalt
fixation point. The strengths, where the asphalt content is lower than the asphalt fixation point, can be predicted
by the proposed generalized form of strength. This proposed equation can assess the laboratory strength of
cement treated soil-RAP mixture under various mixed proportions, cement contents, water contents, and curing
times.