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Workability and Compressive Strength of Geopolymer Mortar from Fly Ash Containing Diatomite |
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| รหัสดีโอไอ | |
| Creator | Tanakorn Phoo-ngernkham and Theerawat Sinsiri |
| Title | Workability and Compressive Strength of Geopolymer Mortar from Fly Ash Containing Diatomite |
| Publisher | Faculty of Engineering, Khon Kaen Univeristy |
| Publication Year | 2554 |
| Journal Title | KKU Engineering Journal |
| Journal Vol. | 38 |
| Journal No. | 1 |
| Page no. | 11-26 |
| Keyword | Geopolymer, Workability, Flow test,Compressive strength, Diatomite |
| ISSN | 0125-8273 |
| Abstract | This article presented workability and compressive strength of fly ash based of geopolymer mortar containing diatomite as binder replacement at the rates of 0, 60, 80, and 100% by weight. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) solutions were mixed together and then used as a liquid portion in the mixture in order to activate the geopolymerization. The ratios between Na2SiO3and NaOH were varied, namesly, 0.5, 1.0, 1.5, 2.0, and 2.5 by weight whereas the ratios between liquid binder of 0.40, 0.50,0.60, and 0.70 by weight were varied. The additional water was added to improve the workability of fresh geopolymer mortar. The ratios between additional water and binder were varied, that is to say, 0, 3, 6, 9, 12, and 15% by weight. In additional, the NaOH concentration of5M, 10M, 15M, and 20M were also used as variables.Each mixture was separated and cured in the oven at the temperature of 60oC, 75oC, and 90oC for 24 h. Flowability of all fresh geopolymer mortars were investigated and the compressive strength test was applied at the ages of 7, 14, and 28 days. The results revealed that the mixture having Na2SiO3/NaOH of 1.5-2.5, 15M of NaOH concentration, and 75oC of curing temperature showed compressive strengthbetween 223-939 ksc which high enough for using as normal strength concrete. Moreover, additional water could improve the workability of fresh geopolymer mortar, however, the compressive strength reduction could be observed. Additionally, the compressive strength of geopolymer mortar increased obviously at early age, however, at the later age it was slightly increased for some mixtures. Furthermore, the replacement of diatomite at the rate of 60 and 80% by weight were well suited for both compressive strength and workability. |
