Influence of rice husk ash substitution on some physical, mechanical and durability properties of the metakaolin-based geopolymer mortar

Year 2022, Volume: 7 Issue: 2, 88 - 94, 28.06.2022

Aigul Kabirova , Mücteba Uysal

https://doi.org/10.47481/jscmt.1093312

Cited By: 4

Abstract

In this study, it is aimed to investigate the influence of rice husk ash, which is a waste by-product of industrial production, on ultrasonic pulse velocity, compressive strength, flexural strength and high temperature endurance of the metakaolin-based geopolymer mortar. For this, the sand was substituted by rice husk ash (RHA) at the rate of 25%, 50% and 75% by wt. in the production of geopolymer mortar. A total of 4 series of metakaolin-based geopolymer mortars (reference series and three series with RHA substitution) were produced. In this study, the geopolymer, in other words, the binder of the mortar was produced by metakaolin and ground granulated blast furnace slag reacting with the mixture of sodium hydroxide (12M NaOH) and sodium silicate (Na2SiO3) solutions. The ratio of metakaolin and reactant mixture (12M NaOH + Na2SiO3) was determined for each series following the preliminary experiments. On the specimens produced as 50 mm cube and 40 x 40 x 160 mm prism, the intended experiments were carried out after specimens underwent curing in a dry oven at 60oC during 72 h and gained strength. The results showed that RHA could be used as a filling material in metakaolin-based geopolymer mortars, and metakaolin-based geopolymer mortars with 50% RHA substitution can be an alternative to the pure metakaolin-based mortar.

Keywords

Geopolymer mortar, metakaolin, ground granulated blast furnace slag, rice husk ash, substitution

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