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A review on the effect of fly ash and slag on the synthesizing of coal bottom ash (CBA) based geopolymer.
* 1 , 2 , 1 , 3 , 3 , 3
1  Graduate Research Assistant
2  Senior Lecturer, UKM
3  Associate Professor
Academic Editor: Samuel Adeloju

Published: 15 October 2021 by MDPI in 2nd International Electronic Conference on Applied Sciences session Chemistry

Geopolymerisation is widely used in the construction sector for its characteristics of strong compressive strength, quick hardening, long term durability, fire and erosion resistance. Most studies focused on raw materials fly ash, RHA, and slag to form geopolymer. Meanwhile, Coal Bottom Ash (CBA) is a new waste that can be easily acquired from thermal power plants, alleviating environmental concerns and dumping site shortages. This paper will review the effects of CBA and additives in producing geopolymer. Those additives that are critical based on their engineering properties performance can be specified as CBA only, CBA with fly ash (FA) , CBA with rice husk ash (RHA). By combining RHA and CBA, the material is deemed lightweight, has improved compressive strength in 28 days, and has excellent water absorption. In terms of utilising CBA alone, it was discovered that the presence of CBA in concrete affects the workability of concrete and substantially rises in terms of strength after 14 days of curing. Increases in compressive strength but a lower fly ash to bottom ash ratio resulted in greater drying shrinkage due to the lower degree of geopolymerisation for the fly ash and bottom ash combination. The findings of these researches indicate that coal bottom ash geopolymer has discovered a viable material for replacing the usage of fine and coarse aggregate in the building sector, particularly in mortar and concrete, and that additional research into industrialisation is necessary.

Keywords: Geopolymer ; Coal bottom ash ; fly ash ; slag ; synthesize