Effects of coarse aggregate on the physical properties of Florida concrete mixes.

Details

• Creators:
  Ferraro, Christopher C. ; Tibbetts, Caitlin M. ; Perry, Michael C. ; Watts, Benjamin E. ; Paris, Jerry M.
• Corporate Creators:
  University of Florida. Dept. of Civil and Coastal Engineering
• Subject/TRT Terms:
  • Portland cement concrete
  • Coarse aggregates
  • Limestone
  • Modulus of elasticity
  • Compressive strength
  • Mix design
  • Physical properties
• Publication/ Report Number:
  BDV-31-977-08se
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  Portland cement concrete is a heterogeneous, composite material composed of coarse and fine granular material ; 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 and can be obtained from a variety of different sources. The ; physical properties of concrete are heavily influenced by the aggregate properties. Most of the coarse aggregate ; produced in Florida is a limestone material that 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, ; limestone from the geologic formations in Florida is typically referred to as “limerock.” The coarse aggregate produced ; in Florida and used in structural concrete require special consideration with regard to relative strength, thermal, and ; physical properties. The structural design of concrete is based on service limit states and utilizes modulus of elasticity ; as a design parameter. However, the modulus of elasticity of concrete used for the design of structures is typically ; determined by relationships which utilize compressive strength. Due to the assumption that structural concrete made ; with weaker Florida limerock would have lower strength than concrete made with other aggregates, an aggregate ; correction factor of 0.9 is used in the calculation of elastic modulus from compressive strength testing for structural ; design equations. The use of an aggregate correction factor of less than 1.0 requires the use of more concrete to meet ; structural requirements. The primary goal of the research was to study the effects of different coarse aggregate types ; on the physical properties and design of portland cement concrete, with the emphasis coarse aggregate from Florida ; foe use in structural concrete. Concrete specimens were made and tested to acquire the information necessary for use ; in the design equations used to predict the physical properties of the concrete. A value of 1.0, rather than the currently ; used value of 0.9, was found to be appropriate for the aggregate correction factor for Florida limerock.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29646/dot_29646_DS1.pdf
• File Type:
  [PDF - 6.59 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:7d40a17bf9d1db443838ee62d70b81cdd1eb4c5aad64a076ca0993cf1a0c8ec8