Strength Assessment of Cement Treated Soil-Reclaimed Asphalt Pavement (Rap) Mixture

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.