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Abstract

This paper investigates about the long term strength and durability properties of Alkali-Activated and Flyash based Geopolymer Concrete comparing with the conventional concrete of M40 grade. The Alkali activators are prepared by combining sodium hydroxide and sodium silicate solution in the ratio of 2.5 and molarities are 12M and 16M by varying two different curing regims namely dry curing and open air curing. Totally nine mixes were prepared with Naoh concentration of 12M and 16M was compares with two curing regims namely open air curing and dry curing . Split tensile strength, flexural strength and durability tests namely rapid chloride permeability tests (RCPT) and sorpitivity tests were conducted on 56 and 90 days. Compressive strength tests were carried out on 14, 28, 56 and 90 days. The investigation resulted that there is increase in strength characteristics with increase in concentration of sodium hydroxide solution and open air cured specimens gained more strength than dry cured specimens. However the sorptivity and rapid chloride permeability test results were not found to perform good due to cracking of surface. When compared with conventional concrete results the strength gained is more in AAS-FA based geopolymer concrete. Also the utilization in construction field is easy since it is Ecofriendly and convenient curing process.