The effect of dry mix sodium hydroxide onto workability and compressive strength of geopolymer paste. The International Journal of Integrated Engineering, 12 (9). pp. 114-120. ISSN 2229-838X (2020)
Abstract
The production of ordinary Portland cement (OPC) consumes considerable amount of natural resources, energy and at the same time contribute in high emission of CO2to the atmosphere. A new material replacing cement as binder called geopolymer is alkali-activated concrete which are made from fly ash, sodium silicate and sodium hydroxide (NaOH). The alkaline solution mixed with fly ash producing alternative binder to OPC binder in concrete named geopolymer paste. In the process, NaOH was fully dissolved in water and cooled to room temperature. This study aims to eliminate this process by using NaOH in solid form together with fly ash before sodium silicate liquid and water poured into the mixture. The amount of NaOH solids were based on 10M concentration. The workability test is in accordance to ASTM C230. Fifty cubic mm of the geopolymer paste were prepared which consists of fly ash to alkaline solution ratio of 1: 0.5 and the curing regime of 80°Cfor 24 hours with 100% humidity were implemented. From laboratory test, the workability of dry method geopolymer paste were decreased. The compressive strength of the dry mix of NaOH showed 55%and the workability has dropped to 58.4%, it showed strength reduction compared to the wet mix method.
| Item Type: | Article |
|---|---|
| Keywords: | Geopolymer paste, Workability, Compressive strength, Fly ash, Sodium hydroxide, Sodium silicate, Alkaline solution |
| Taxonomy: | By Subject > College of Engineering > Civil Engineering > Structural and Material |
| Local Content Hub: | Subjects > College of Engineering |
| Depositing User: | Eza Eliana Abdul Wahid |
| Date Deposited: | 15 Nov 2022 09:26 |
| Last Modified: | 15 Nov 2022 09:26 |
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