Accelerated Curing and Strength-Modulus Correlation for Lime-Stabilized Soils

摘要

This study sought to identify the equivalent 105DGF curing duration for lime-stabilized soil (LSS) that will yield the equivalent unconfined compressive strength (UCS) to that resulting from 28-day, 73 degrees F curing. Both 5-day and 7-day 105 degrees F (or 100 degrees F) curing have been used in practice. The study also sought to characterize the relationship between resilient modulus (Mr) and UCS for LSS soils, since the prevailing correlation between Mr and UCS for LSS based on Thompson (1966) was not developed from cyclic loading and has been validated with only limited data. The study revealed that the 5-day, 105 degrees F accelerated curing yielded UCS values more representative of 28-day 73 degrees F UCS than did the 7-day, 105 degrees F curing regime. However, there is no universal equivalent accelerated curing duration for LSS; therefore, 5-day 105 degrees F curing can yield erroneous estimates of 28-day 73 degrees F UCS. The study recommends verification of the equivalent 105 degrees F curing duration for each LSS to gage the most representative accelerated curing duration. Based on experimental M(sub r) UCS data, the relationship M(sub r) (ksi) = 0.124 UCS (psi) + 9.98 was found to be conservative in its prediction of M(sub r) from UCS.