Effect of Type of Curing on Mechanical Properties of Fly Ash-Based Geopolymer Concrete
J. V. Narasimha Raju1, T. Chandrasekhar Rao2, V. Ravindra3
1J. V. Narasimha Raju, Department of Civil Engineering, JNTUK, Kakinada (Andhra Pradesh), India.
2Dr. T. Chandrasekhar Rao, Department of Civil Engineering, Baptla Engineering College, Baptla (Andhra Pradesh), India.
3Dr. V. Ravindra, Department of Civil Engineering, JNTUK, Kakinada (Andhra Pradesh), India.
Manuscript received on 14 May 2019 | Revised Manuscript received on 08 June 2019 | Manuscript Published on 15 June 2019 | PP: 302-307 | Volume-8 Issue-1S3 June 2019 | Retrieval Number: A10540681S319/2019©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This paper represents experimental data on compressive strength, split tensile strength and flexural strength of a geopolymer concrete which was prepared with source material is fly ash and sodium based alkaline solution as alkaline activator. The mix was produced taking combined aggregate content as 70% in unit mass of concrete and by thoroughly blending with sodium-silicate gel at a NaOH/Na2SiO3 ratio of 2.50. Two types of curing conditions were adopted ambient condition (7, 14 and 28 days) and heat-curing at 70o C (3, 12 and 24 hours) for studying the above properties. In two more independent series of tests, fly ash was replaced by GGBS and silica fume of varied dosages (0, 5, 10, 15 and 20% by dry weight), and all the above mechanical properties were studied upon specimens prepared with the above geopolymer and cured in the above-mentioned conditions. Casting and testing of geopolymer concrete specimens were done in a similar manner as in the case of conventional concrete. Specimens of cubes, cylinders and beams were casted and tested to study compressive strength, split tensile strength and flexural strength respectively. The mechanical strengths increased with increasing curing period in both the conditions; and strengths were higher under heat-curing condition than under ambient condition. Further, the strengths increased with increasing GGBS content and silica fume content.
Keywords: Ambient Curing, Fly Ash, Geopolymer, GGBS, Heat-Curing, Silica Fume, Sodium-Silicate Gel.
Scope of the Article: Properties and Mechanics of Concrete