Studying the Effect of Various Parameters on Compressive Strength of Geopolymer Concrete Produced By Khorasan Pozzolans

Document Type : Research Paper

Authors

1 Assistant professor, Department of civil engineering, Islamic Azad University of Mashhad

2 Department of civil engineering, Azad University of Mashhad

3 Department of civil engineering, Azad university of mashhad

Abstract

Geopolymers, as a type of mineral polymers, are nano-structural Amorphous solid. They are usually produced in temperatures below 120 °C by polymerization of aluminosilicate monomers in alkaline solutions. The compressive strength of geopolymer concretes mainly depends on its chemical ingredients, including Aluminosilicate minerals and alkaline solution. This paper presents the results of an experimental study on compressive strength of geopolymer concretes made by using Khorasan province pozzolan. Effects of various parameters such as solution-to-solid ratio, sodium silicate-to-sodium hydroxide ratio, setting tempertature, setting time, Sodium hydroxide Concentration, base water, silice-to-aluminium ratio, sodium silicate chemical composition on geopolymer compressive strength was studied. It was observed that the compressive strength of geopolymer concrete is increased by increasing the sodium silicate and silica in the mixture and increasing sodium hydroxide molarity and setting temperature, the concrete compressive strength is increased. On the other hand, increasing the water and sodium oxide weights in the mixture and sodium silicate-to-sodium hydroxide ratio results in decreasing the concrete strength.

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