Details:

Creators:
Ferraro, Christopher C. ; Tibbetts, Caitlin M. ; Perry, Michael C. ; Watts, Benjamin E. ; Paris, Jerry M.
Ferraro, Christopher C. ; Tibbetts, Caitlin M. ; Perry, Michael C. ; Watts, Benjamin E. ; Paris, Jerry M. Less -
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:

Supporting Files

• No Additional Files

More +