Abstract:
This research deals with the improvement of crushed rock, decomposed granite, lateritic soil and silty sand by using pozzolanic portland cement and portland cement type 1. The Unconfined Compressive Strength (UCS) and modulus of elasticity at 50 percent strength (E,,) of all soil specimens mixed with 2 4 6 and 8 percent of pozzolanic and type 1 portland cement were measured. All tested specimens were cured at 1, 7, 14, 28 and 90 days. The investigation results showed that UCS and E,, are dependent on cement content and curing times. The strength markedly increased with cement content. In comparisons of the measured UCS between two types of cement, soil mixed pozzolanic portland cement gains the lower strength at short-term (after mixing up to 28 days, while it gains higher strength at larger curing time (after 28 days). The procedures of testing in this research are based on procedures of Department of Highway (2536), which uses the UCS for the road design. Therefore, the obtained results can be prepared as the future data. The results of this work indicate the approximately linear relation of UCS & Cement content, UCS & curing time and UCS & E50 of all soil types mixed with two cement types and their slopes are almost the same.