Rationale

Section 12 only. (1) Changes to Cure Time and Temperature Wording: While the current wording allows for accelerated curing conditions, it presents them as though they are not the standard practice. It is well established that the 7-day unconfined compressive strength of compacted soil-lime mixtures under ambient conditions does not reliably predict the final strength that may ultimately develop. Although testing at ambient conditions is ideal, the industry cannot afford to wait 28 to 90 days to observe the progression of these mixtures. The National Lime Association’s “Mix Design and Testing Procedures for Lime Stabilized Soil” Technical Brief recommends curing specimens for 7 days at 40°C and recent testing has demonstrated a strong correlation when curing specimens at 53°C for 48 hours. When the D18.15 subcommittee last met, the group was unaware of the data supporting the claim that curing temperatures above 49°C should be avoided.