Development and Property Evaluation of Fly Ash-Based Geopolymer Concrete

Authors

  • Vikram M. K  Lecture, Department of Civil Engineering, Government Polytechnic, Immadihalli, Bengaluru, Karnataka, India
  • Aparna B. P  Lecture, Department of Civil Engineering, Government Polytechnic, Immadihalli, Bengaluru, Karnataka, India
  • Khalander P. S  Lecture, Department of Civil Engineering, Government Polytechnic, Mundgod, Dst: Karwar, Karnataka, India

Keywords:

Fly Ash-Based Geopolymer Concrete, Mechanical Properties, Durability, Compressive Strength, Carbon Emissions Reduction

Abstract

Fly ash-based geopolymer concrete proved to be an ideal alternative to conventional Portland cement concretes with improved mechanical properties as well as superior durability, reducing carbon emissions by over half. The study discusses the impact of variations in fly ash content, ranging from 70% to 85%, on the performance of geopolymer concrete. Experimental methods involved optimising the mix design with the use of activators sodium hydroxide and sodium silicate, and the curing at increased temperatures to accelerate geopolymerization. The major tests conducted for testing durability included compressive strength in accordance with ASTM C39, water absorption ASTM C642, chloride permeability ASTM C1202, sulfate expansion ASTM C1012, and freeze-thaw resistance according to ASTM C666. The results indicate improvement of 23% in compressive strength that ranged from 39 MPa at 70% fly ash to 48 MPa at 85% fly ash. Water absorption improved by 34%, while the chlorides permeability reduced by 44% and the sulfate expansion decreased by 62.5%. The freeze-thaw resistance is enhanced by 3.5% as indicated by the performances under cyclic variations in temperature.

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International Journal of Scientific Research in Science, Engineering and Technology

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Published

2019-12-30

Issue

Volume 6, Issue 6, November-December-2019

Section

Research Articles

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How to Cite

[1]
Vikram M. K, Aparna B. P, Khalander P. S "Development and Property Evaluation of Fly Ash-Based Geopolymer Concrete" International Journal of Scientific Research in Science, Engineering and Technology (IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 6, Issue 6, pp.293-298 , November-December-2019.