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:
  Coarse Aggregates Compressive Strength Limestone Mix Design Modulus Of Elasticity Physical Properties Portland Cement Concrete
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:7d40a17bf9d1db443838ee62d70b81cdd1eb4c5aad64a076ca0993cf1a0c8ec8
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29646/dot_29646_DS1.pdf
• File Type:
  [PDF - 6.59 MB ]