The use of recycled concrete aggregate in new concrete mixes

Crawford, Timothy Michael John (2001). The use of recycled concrete aggregate in new concrete mixes B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Crawford, Timothy Michael John
Thesis Title The use of recycled concrete aggregate in new concrete mixes
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2001
Thesis type B.Sc Thesis
Supervisor Dr. Liza O'Moore
Total pages 41
Language eng
Subjects 0905 Civil Engineering
Formatted abstract

The use of recycled concrete aggregates has the potential to create large economic and environmental benefits for the construction industry. Use of recycled concrete aggregate not only reduces the need for dumping of demolition waste in landfill but also reduces the need for new natural aggregates. However, the effects of including recycled concrete aggregates in new concrete mixes, is an area that is currently not particularly well studied or understood.

This thesis contains two parts. Firstly it presents a review of the available literature on the topic. It then contains an experimental study designed to investigate the effects of the inclusion of various proportions of recycled concrete aggregates on the mechanical properties of concrete.

A review of the available literature reveals that concrete containing recycled concrete aggregate has lower compressive strength, lower tensile strength, lower elastic modulus and lower density than equivalent natural aggregate concrete. Recycled aggregate concrete also exhibits higher drying shrinkage and higher creep than natural aggregate concrete.

The experimental study indicates that as the proportion of recycled concrete aggregate included in the mix is increased, the compressive strength, flexural tensile strength, modulus of elasticity and density are all reduced. It also shows that the addition of recycled concrete aggregate causes an increase in drying shrinkage. It appears, however, that the addition of small proportions of coarse recycled concrete aggregate (20%) causes no significant change in the properties of the concrete.

Keyword Recycled concrete aggregates
New concrete mixes
Additional Notes * Civil Engineering undergraduate theses. 2001

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
Citation counts: Google Scholar Search Google Scholar
Created: Tue, 08 Oct 2013, 15:48:22 EST by Mr Yun Xiao on behalf of Scholarly Communication and Digitisation Service