Effect of Fly Ash on Compressive Strength of Metakaolin Based Geopolymer

Abstract:

Geopolymers were produced through two precursors including solid components and alkaline activators.It was attracted interesting as a green technology because it was the possibility to the remarkably low emission of CO2 in its manufacturing process as compared with Portland Cement (PC). In the present work, the studied program was divided into three steps. In Step 1, Ranong clay (Thailand source) was used as a solid powder and the concentrationof sodium hydroxidewas tested as an alkali solution. After mixing, the geopolymer slurry was casted into a steel mold. The curing condition of all specimens was maintained at 60oC for 24 hrs. The compressive strength of all specimens was tested after curing 1 day. The maximum compressive strength of 10M NaOH was selected intothe next step. In step 2, the partial replacement of 10M NaOH by Na2SiO3 was studied. In this case, 20 wt% of Na2SiO3 was presented as alkaline activatorinto the next step. In step 3, the amount of Fly ash(0%, 10%, 20%, 30%, 40% and 50% by weight) was studied on partial metakaolin replacement. However, the highest compressive strength of 30 wt% fly ashis29.74MPa. To support the results from compressive strength, the microstructure, and geopolymerizationof all compositions were investigated using a scanning electron microscope and a Fourier-transform infrared spectroscopy, respectively.

• Periodical: Applied Mechanics and Materials (Volume 873)
• Pages: 170-175
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.873.170
• Online since: November 2017
• Authors: Chokkha Siriwan*
• Keywords: Compressive Strength, Geopolymer, Metakaolin, Waste Material

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