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Abstract:The Mississippi Department of Transportation revised the specifications for cement-treated
bases between the 1990 and 2004 editions of “Mississippi Standard Specifications for Road and Bridge
Construction.” The required compressive strength of laboratory specimens was reduced in an effort to
reduce shrinkage cracking in the cement-treated layer. The compaction effort of the in-place cementtreated
base was increase to produce a stronger layer. These significant changes impact in-place properties
and performance of the cement-treated base. Prior to this research, the author is not aware of any field
studies that have been conducted to determine how these changes affected in-place properties. This
research documents field and laboratory testing of two MDOT road projects. Findings were compared to
project specifications and cement-treated base property variability was calculated and graphically
illustrated.
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