| Issue |
MATEC Web Conf.
Volume 120, 2017
International Conference on Advances in Sustainable Construction Materials & Civil Engineering Systems (ASCMCES-17)
|
|
|---|---|---|
| Article Number | 03010 | |
| Number of page(s) | 9 | |
| Section | Recycling for Sustainable Concrete | |
| DOI | https://doi.org/10.1051/matecconf/201712003010 | |
| Published online | 09 August 2017 | |
The use of a concrete additive to eliminate returned concrete waste volumes
1 University of Johannesburg, PO Box 524, Auckland Park, 2006, Johannesburg, South Africa
2 University of Johannesburg, PO Box 524, Auckland Park, 2006, Johannesburg, South Africa
3 University of Johannesburg, PO Box 524, Auckland Park, 2006, Johannesburg, South Africa
* Corresponding author: jannesb@uj.ac.za
This paper investigates the effects of the use of a recently developed two-component powdered product made from polymers and inorganic compounds that can be mechanically mixed into returned fresh ready-mix concrete to allow for the separation of the concrete into fine and coarse aggregates. This allows for the re-use of the returned concrete as aggregates in the manufacturing of new concrete. The returned concrete waste can therefore be eliminated, thus reducing virgin aggregate usage, as well as reducing the environmental impact of returned concrete. In this study, the treated recycled fresh concrete was separated into fine and coarse aggregates, and then used at replacement levels of 0%, 25%, 50%, 75% and 100%. The effect of the product on the material classification, and on important fresh and hardened properties of the concrete for the above-mentioned replacement values was tested. For the fine aggregate, the results indicate minimal changes in both the fresh and hardened properties. For the coarse aggregate, the results show a marked improvement of flexural strength with an increase in replacement value when coarse aggregates are used. Very high replacement levels may be used with very little effect on the quality of the new concrete.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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