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

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 (M sub r) and UCS for LSS soils, since the prevailing correlation between M sub r 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 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. Based on the results of the study, the Colorado Department of Transportation (CDOT) will continue using the 5-day, 100°F accelerated curing protocol for LSS, in addition to other approved curing procedures. The construction process for lime-stabilized soil requires diligent quality control and quality assurance (QC/QA). CDOT should investigate alternative methods of QC/QA that can be conducted in the field instead of the laboratory.

Language

  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 56p

Subject/Index Terms

Filing Info

  • Accession Number: 01154159
  • Record Type: Publication
  • Report/Paper Numbers: CDOT-2010-1
  • Contract Numbers: 80.26
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 2 2010 10:28AM