Properties of Geopolymer concrete with recycled aggregate | ||
| International Journal of Advances in Structural and Geotechnical Engineering | ||
| Volume 06, Issue 01, February 2022, Pages 122-132 PDF (466.5 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/asge.2022.274843 | ||
| Abstract | ||
| It is well known that Portland cement concrete isn't a friendly construction material. This due to cement manufacturing is an energy intensive process and it releases a large amount of greenhouse gas to the atmosphere. So, the effort of researchers is directed to use eco-friendly materials such as Geopolymer composites to achieve the green and sustainable construction industry. Moreover, recycling of the concrete waste from construction and demolition sites is considered another trend in saving the environment form pollution. In the light of this, the current research presents an experimental study to investigate the influence of using recycled aggregate in the properties of Geopolymer concrete. Geopolymer mixtures with different replacement percentages by volume of recycled coarse aggregate were used. Two types of recycled aggregates with maximum grain sizes namely 10 and 25 mm were investigated with 0, 20, 40, 60 and 100% as a replacement for the natural aggregate by volume. The used binder was a mixture of fly ash and alkaline solution, the used alkaline solution composed of sodium hydroxide with 12 mole concentration as well as sodium silicate. Both of fresh and hardened properties were investigated. The results show that the unit weight slightly reduced with the increase of the replacement ratio. Moreover, the consistency of the studied mixtures reduced with the increase of the replacement percentage. On the other hand, the mechanical properties indicated that the recycled aggregate may be used in producing structural Geopolymer concrete with comparable properties which can make construction industry more sustainable process. | ||
| Keywords | ||
| Geopolymer concrete; recycled aggregate; fresh properties; hardened properties | ||
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