This course is based on the FHWA Tech Brief on Bases and Subbases for Concrete Pavements and provides guidance on the selection and construction of base and subbase layers. It covers various types of base and subbase layers, including unstabilized base, cement-stabilized base, lean concrete base, asphalt-treated base, and stabilized open-grade drainage layers. The course highlights best practices for constructing each type of base and subbase layer and emphasizes the importance of selecting a base type based on the purpose of the base, locally available materials, and cost-effectiveness.

Additionally, the course explores the use of recycled materials as a source of aggregate for base and subbase layers and provides guidance on evaluating cost-effectiveness using life cycle cost analysis. Participants will gain insights into the performance, material properties, and construction of base and subbase layers, as well as considerations for future research directions.

Topics Covered:

• Functions of Base and Subbase Layers
• Types of Base and Subbase Materials
• Material Properties for Base and Subbase Layers
• Selection of Base and Subbase Types
• Construction of Base and Subbase Layers
• Performance of Base and Subbase Layers
• Cost Considerations for Base and Subbase Layers
• Conclusion and Future Research Directions