EFFECT OF KAOLIN SUBSTITUTION ON FLY ASH-BASED GEOPOLYMER MORTAR STRENGTH USING 15M NaOH
DOI:
https://doi.org/10.26740/rekats.v13n01.p01-08Keywords:
Fly ash, kaolin, compressive strength, geopolymer mortarAbstract
In the world of construction, mortar mixtures are generally made using materials such as cement, sand and air. However, carbon dioxide emissions produced during the cement production process are proportional to the amount of cement produced. This causes environmental damage, including the greenhouse effect and global warming. To make mortar that is more environmentally friendly, cement substitutes are needed in the mortar mixture. One such alternative is to use fly ash and kaolin, which have similar contents to cement, to make an environmentally friendly mortar known as geopolymer mortar. Geopolymer mortar is made from materials rich in compounds such as alumina (Al) and silica (Si). Fly ash and kaolin have high alumina (Al) and silica (Si) contents. In this research, the activators used were 15 molar sodium hydroxide (NaOH) and sodium silicate. The aim of this research is to determine the effect of kaolin substitution in fly ash-based geopolymer mortar with 15 molar NaOH on the compressive strength of geopolymer mortar. There were 7 mixture designs in this study, with a composition of between 90% and 40% fly ash and kaolin substitution between 10% and 60%. The research results showed that the highest compressive strength at 28 days was achieved in mixture design 2, with a composition of 90% fly ash and 10% kaolin, which reached an average of 33,5 MPa.
Keywords: Fly ash, kaolin, compressive strength, geopolymer mortar.
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