Mix Design
Mix designs are recommended for all bituminous and chemical base stabilization applications. Adjustments may be required in the field to the stabilizing agent design content to obtain optimum performance. Mix designs for bituminous and cementitious stabilized bases are similar to FDR mix designs. ARRA publications FDR201A and FDR202 may be used for both emulsified asphalt and cementitious stabilized bases, respectively. Regardless of the stabilizing agent used, mix dsigns for stabilized bases should include the following general procedures:
- Obtain samples of the aggregate and any additional materials
- Combine aggregate and any additional materials to desired percentages and determine gradation, plasticity index, Ph, sulfates and sand equivalent of combined materials
- Determine need for and select stabilizing agent and additives, if necessary, based on structural and material requirements
- Determine maximum dry density and optimum moisture content of combined materials
- Mix and compact specimens at desired moisture content with varying percentages of stabilizing agent
- Cure specimens
- Test trial mixtures for strength and durability
- Establish job mix formula
- Make adjustments in the field as necessary
Mix designs should include durability and/or freeze thaw testing to ensure long term performance
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