Feasibility of Developing Sustainable Concrete Using Environmentally Friendly Coarse Aggregate

Chamila Gunasekara; Charitha Seneviratne; David W. Law; Sujeeva Setunge

doi:10.3390/app10155207

journal article Open Access Jul 28, 2020

Feasibility of Developing Sustainable Concrete Using Environmentally Friendly Coarse Aggregate

Chamila Gunasekara

Charitha Seneviratne

David W. Law

Sujeeva Setunge

Applied Sciences Vol. 10 No. 15 pp. 5207 · MDPI AG

View at Publisher Save 10.3390/app10155207

Abstract

Quarry aggregate reserves are depleting rapidly within Australia and the rest of the world due to an increasing demand for aggregates driven by expansion in construction. The annual production of premix concrete in Australia is approximately 30 million cubic meters, while 3–5% of concrete delivered to site remains unused and is disposed of in landfill or crushing plants. The production of coarse aggregates using this waste concrete is potentially a sustainable approach to reduce environmental and economic impact. A testing program has been conducted to investigate mechanical performance and permeation characteristics of concrete produced using a novel manufactured coarse aggregate recycled directly from fresh premix concrete. The recycled coarse aggregate (RCA) concrete satisfied the specified 28-day design strength of 25 MPa and 40 MPa at 28 days and a mean compressive strength of 60 MPa at 90 days. Aggregate grading was observed to determine strength development, while low water absorption, low drying shrinkage, and higher packing density indicate that the RCA concrete is a high-quality material with a dense pore structure. The rough fracture surface of the aggregate increased the bond between C-S-H gel matrix and RCA at the interfacial transition zone. Furthermore, a good correlation was observed between compressive strength and all other mechanical properties displayed by the quarried aggregate concrete. The application of design equations as stated in Australian standards were observed to provide a conservative design for RCA concrete structures based on the mechanical properties.

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Details

Published: Jul 28, 2020
Vol/Issue: 10(15)
Pages: 5207
License: View

Authors

C

Chamila Gunasekara

School of Engineering, RMIT University, Melbourne 3000, Victoria, Australia

C

Charitha Seneviratne

School of Engineering, RMIT University, Melbourne 3000, Victoria, Australia

D

David W. Law

School of Engineering, RMIT University, Melbourne 3000, Victoria, Australia

S

Sujeeva Setunge

School of Engineering, RMIT University, Melbourne 3000, Victoria, Australia

Cite This Article

Chamila Gunasekara, Charitha Seneviratne, David W. Law, et al. (2020). Feasibility of Developing Sustainable Concrete Using Environmentally Friendly Coarse Aggregate. Applied Sciences, 10(15), 5207. https://doi.org/10.3390/app10155207

Feasibility of Developing Sustainable Concrete Using Environmentally Friendly Coarse Aggregate

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