About the Project

Portland cement concrete is a heterogeneous, composite material composed of coarse granular material, which is embedded in a matrix of hardened paste. The coarse material is aggregate, which is primarily used as inexpensive filler and comprises the majority of the volume of concrete. Aggregate materials can be obtained from a variety of different sources, both natural and manufactured. Most of the coarse aggregate produced in Florida, is a limestone material, which is more porous, less dense, and softer than limestone produced from other areas of the U.S. To differentiate between limestone produced in Florida, and limestone produced elsewhere, Florida limestone has been called Florida “limerock” by the local concrete industry. Therefore, the coarse aggregates produced in Florida used in structural concrete require special consideration with regard to relative strength, thermal, physical, and durability properties.

Goals

The main goal of this research is to study the effects of different coarse aggregate on the physical properties of Portland cement concrete. The study will incorporate the use of aggregates produced in Florida for the use in structural concrete. The results of this research will ultimately enhance the safety and durability of FDOT structural concrete and aid in the development of performance-based specifications.

Sponsors

• Florida Department of Transportation

Project Manager

• H.D. Deford

Graduate Assistant

• Michael Perry