Accelerated curing and strength-modulus correlation for lime-stabilized soils : final report, January 2010.
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2010-01-01
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Edition:Final.
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Abstract:This study sought to identify the equivalent 105°F curing duration for lime-stabilized soil (LSS) that will
yield the equivalent unconfined compressive strength (UCS) to that resulting from 28-day, 73°F curing. Both
5-day and 7-day 105°F (or 100°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°F accelerated curing yielded UCS
values more representative of 28-day 73°F UCS than did the 7-day, 105°F curing regime. However, there is
no universal equivalent accelerated curing duration for LSS; therefore, 5-day 105°F curing can yield
erroneous estimates of 28-day 73°F UCS. The study recommends verification of the equivalent 105°F curing
duration for each LSS to gage the most representative accelerated curing duration. Based on experimental Mr
– UCS data, the relationship Mr (ksi) = 0.124 UCS (psi) + 9.98 was found to be conservative in its prediction
of Mr from UCS.
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