United States Department of Transportation
i
Design and construction control guidance for chemically stabilized pavement base layers.
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2013-12-01
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[PDF-8.82 MB]
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Abstract:A laboratory and field study was conducted related to chemically stabilized pavement layers, which is also
referred to as soil-cement. Soil-cement practices within MDOT related to Class 9C soils used for base layers
were evaluated in this report. The overall objective was to provide draft design and quality control guidance that
could be incorporated and/or specified to improve performance of soil-cement base layers. A total of 2,101 tests
were performed to evaluate a variety of parameters. Testing included strength versus time, strength variability,
compaction, elastic modulus, wheel tracking, and thermal profile measurement. One key component of the
research was development of economical thermal profile equipment to evaluate compacted soil-cement during
the first few hours of hydration. The primary intention of this equipment is a quality control tool. Another key
component of the research was development of equipment that allowed soil-cement to be compacted inside a
plastic mold that could be used for laboratory mix design, specimen preparation for pavement layer thickness
design, and for quality control. Results indicated the plastic mold compaction approach has many advantages
and should be implemented into design and quality control operations. At the present time, widespread use of
thermal profiles for quality control is not recommended. Additional study, however, could result in effective
implementation of thermal profiles into soil-cement construction projects on a more frequent basis.
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