Comparing the variability in mechanical properties of concrete made from recycled concrete aggregates

Tim Haikmoller; Ayodele Olofinjana; Christophe Gerber

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Comparing the variability in mechanical properties of concrete made from recycled concrete aggregates

Conference paper

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Comparing the variability in mechanical properties of concrete made from recycled concrete aggregates

Tim Haikmoller, Ayodele Olofinjana and Christophe Gerber

Proceedings of the 23rd Australasian Conference on the Mechanics of Structures and Materials, pp.237-242

Australasian Conference on the Mechanics of Structures and Materials (ACMSM), 23rd (Byron Bay, Australia, 09-Dec-2014–12-Dec-2014)

Southern Cross University

2014

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Abstract

Materials Engineering

recycled concrete

RCA

compression strength

aggregate

Weibull modulus

Concrete is the most widely used construction material and we expect its dominance in the mix of construction materials to continue. In view of the environmental impact associated with concrete production, recycling provides a credible path for gaining some green credentials. Recent reports have proven that recycled concrete aggregates (RCA) in proportion of less than 30% of overall aggregate has produced concrete with compressive strengths greater than 25MPa and comparable to those made from fresh quarried aggregate materials. The use of recycled concrete however, is still restricted to non-structural applications mainly because of the reliability issues in service and there is little information on the variability expected in reported values and how these compared with conventional concrete. In this study, we investigated the variability experienced with measurements in laboratory properties of concrete made with various proportions of recycled aggregates using standard split tests. Data obtained were subjected to Weibull statistics and variability is expressed in terms of Weibull modulus. It is shown that characteristic strengths determined through Weibull statistics followed similar trend with previously published data on compression strengths. The Weibull moduli of 10 - 24 determined for RCA concrete are comparable to those of quality controlled normal concrete thus suggesting reliability was not compromised with replacements of natural aggregate with RCA.

Details

Title: Comparing the variability in mechanical properties of concrete made from recycled concrete aggregates
Authors: Tim Haikmoller (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Ayodele Olofinjana (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Christophe Gerber (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Contributors: S T Smith (Editor)
Publication details: Proceedings of the 23rd Australasian Conference on the Mechanics of Structures and Materials, pp.237-242
Conference details: Australasian Conference on the Mechanics of Structures and Materials (ACMSM), 23rd (Byron Bay, Australia, 09-Dec-2014–12-Dec-2014)
Publisher: Southern Cross University
Date published: 2014
Copyright note: Copyright © 2014 The Authors. This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99448610802621
Output Type: Conference paper

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