The Effect of Metakaolin on the Compressive Strength of Recycled Aggregate Concrete
| dc.contributor.advisor | Girma, Zerayohannes (PhD) | |
| dc.contributor.author | Aron, Berhanu | |
| dc.date.accessioned | 2020-03-04T11:33:06Z | |
| dc.date.accessioned | 2023-11-11T12:56:27Z | |
| dc.date.available | 2020-03-04T11:33:06Z | |
| dc.date.available | 2023-11-11T12:56:27Z | |
| dc.date.issued | 2019-10-04 | |
| dc.description.abstract | Large quantity of construction and demolition waste has been produced due to the economic growth of the world. However, the most common way to dispose of such waste is by landfill. Without proper sorting and handling of it, as time passes, landfills will cause many environmental issues. Furthermore, the continuous utilization of natural aggregates will cause resource scarcity. The potential solution for these problems is the recycling of aggregates. Still, due to strength reduction associated with recycled aggregates, its usage is restricted for low strength concrete. On the other hand, incorporation of metakaolin as a cement replacement in recycled aggregate concretes could pave a path towards a sustainable future. In addition, kaolin, the original material from which metakaolin is produced, is found in large quantities in Ethiopia which makes it an attractive option. This research presents the effect of metakaolin as a cement replacement on the properties of fresh and hardened recycled coarse aggregate concrete as well as natural coarse aggregate concrete. The recycled coarse aggregate is extracted from first-hand cast laboratory cubes with known average compressive strength. Different types of concrete mixtures are tested: concrete made with natural coarse aggregate as a control concrete, concrete made with recycled coarse aggregate (0%, 25%, 50%, 75% and 100% replacement of natural coarse aggregate), concrete made with metakaolin as cement replacement (0%, 6%, 12%, 18%, and 24% replacement of cement), and concrete made with recycled coarse aggregate (0%, 25%, 50%, 75% and 100% replacement of natural coarse aggregate) with metakaolin as cement replacement (6%, 12%, and 18% replacement of cement). Additionally, a separate experiment has been conducted to check the production of metakaolin from locally found kaolin samples. The outcomes of this research show that the use of metakaolin as a cement replacement improved the compressive strength of recycled coarse aggregate concrete and even resulted in a compressive strength almost equal to natural coarse aggregate concrete. In addition, this thesis has shown that metakaolin can be produced from locally occurring kaolin by thermal activation. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/20827 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Recycled Aggregate Concrete | en_US |
| dc.subject | Metakaolin | en_US |
| dc.subject | ompressive Strength | en_US |
| dc.title | The Effect of Metakaolin on the Compressive Strength of Recycled Aggregate Concrete | en_US |
| dc.type | Thesis | en_US |