Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 74, Issue -, Pages 132-139Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.08.055
Keywords
Concrete; Strength; Elastic modulus; Aggregate; High strength concrete
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Funding
- Concrete Materials and Structural Integrity Research Unit at The University of Cape Town (CoMSIRU)
- PPC Cement (Pty) Ltd.
- Concrete Institute
- SIM South Africa
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This paper examines the influence of 2 common South African aggregate types on the compressive strength, split and flexural tensile strength and elastic modulus properties of high strength concrete. Two different aggregate types (Andesite and Granite) were used to produce concrete with target strengths ranging from 30 MPa to 120 MPa. Granite concrete was found to have a higher compressive strength, while the stiffer Andesite aggregate produced concrete with a significantly higher elastic modulus. An attempt is made to explain this phenomenon with fracture mechanic theories. No trend was identified for the influence of aggregate type on splitting and flexural tensile strength. The effectiveness of the SANS and EN elastic modulus prediction models was analysed against the test results and it was found that both prediction models accurately predicted elastic modulus values for the Andesite concrete, but produced far less accurate predictions for the Granite concrete. (C) 2014 Elsevier Ltd. All rights reserved.
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