Abstract
Geopolymer is a novel binding material produced from the reaction of fly ash with an alkaline solution. In Geopolymer mortar, Portland cement is not utilized at all. In this research, the influence of various parameters on the short term engineering properties of fresh and hardened low-calcium fly ash-based Geopolymer mortar were studied. Tests were carried out on 50 x 50 x 50mm cube Geopolymer mortar specimens. The test results revealed that as the concentration of alkaline activator increases, the compressive strength of Geopolymer mortar also increases. Specimens cured at temperature of 65oC for 1 day showed the highest 28 days compressive strength. The mass ratio of activator/fly ash of 0.4 produced the highest 28 days compressive strength for the specimen. The obtained compressive strength was in the range of 1.6MPa – 20MPa.
Highlights
Portland cement concrete industry has grown astronomically in recent years
About half of the carbon dioxide emissions from Portland cement production are due to calcination of limestone, while the other half are due to combustion of fossil fuel
This paper presents the results of a study on the strength and setting times of fly ash-based geopolymer mortar
Summary
Portland cement concrete industry has grown astronomically in recent years. It will continue to grow as the result of continuous urban development. This paper presents the results of a study on the strength and setting times of fly ash-based geopolymer mortar. In a research conducted by Palomo, Grutzeck, and Blanco (1999), the effects of curing temperature, curing time, the solution / fly ash ratio, and alkali activation of fly ash with high concentration of activator, on the mechanical properties of Geopolymer were studied. A study was carried out by van Jaarsveld, van Deventer and Lukey (2002) which aimed to investigate the effects of composition of source materials and curing process on the final chemical and physical properties of Geopolymers. Van Jaarsveld, van Deventer, Lukey (2003) conducted a study and stated that the source materials determined the properties of geopolymers especially the CaO content and the water-to-fly ash ratio. ASTM Standard C191 for Portland cement paste was modified for measuring the setting times of fly ash-based geopolymer mortar using Vicat needle. The final setting time, defined as the time when the needle did not sink visibly into the Geopolymer paste, was determined
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