Influence of calcium and alumina-based pozzolanas on the strength properties of low calcium fly ash geopolymer concrete

V Srinivasa Reddy,V Siva Prasad Raju,P Bobba,S Tummala,K Saiteja Chary,S Kosaraju,S Singh,S Shrihari

doi:10.1051/e3sconf/202130901104

Abstract

This work presents the effect of Ground granulated blast furnace slag (GGBS), fly ash (FA) and metakaolin (MK) on the strength properties of geopolymer concrete (GPC). Geopolymer concrete made with FA produces calcium aluminosilicate hydrate (C-A-S-H) product due to presence of alumina and sodium aluminosilicate hydrate (N-A-S-H) gel as main reaction product of polymerization. Geopolymer concrete made with FA and GGBS, calcium silicate hydrate (C-S-H) also gets produced additionally with calcium aluminosilicate hydrate (C-A-S-H) gel and sodium aluminosilicate hydrate (N-A-S-H) gel due to presence of high content of CaO in GGBS. This additional product imparts more strength performance in GPC. In geopolymer concrete made with FA and MK, the more amount of calcium aluminosilicate hydrate (C-A-S-H) is produced due to presence of high amount of alumina in metakaolin along with sodium aluminosilicate hydrates (N-A-S-H) giving more strength to GPC. Metakaolin is recommended to be used for the development of GPC because it has high amount of alumina.

Highlights

The processing of one ton of cement releases one ton of “CO2” carbon dioxide into the atmosphere contributing to global warming [1]
This work presents the effect of Ground granulated blast furnace slag (GGBS), fly ash (FA) and metakaolin (MK) on the strength properties of geopolymer concrete (GPC)
Geopolymer concrete made with FA produces calcium aluminosilicate hydrate (C-A-S-H) product due to presence of alumina and sodium aluminosilicate hydrate (N-A-S-H) gel as main reaction product of polymerization

Summary

Introduction

The processing of one ton of cement releases one ton of “CO2” carbon dioxide into the atmosphere contributing to global warming [1]. A prerequisite for the current situation is that we create additional cement production facilities or look for alternative binder systems to manufacture concrete? A large amount of fly ash is generated from thermal power plants around the world and is typically used as filler in low-level zones [2]. "Geopolymer concrete" is an alternative binding system with fly ash for concrete removal. In combination with Geopolymer binding aggregates, Geopolymer composites are made. Ideologies as they have very strong early strength, they are suitable for the design,

Geopolymer Concrete

Split tensile Strength

Findings

Conclusions