Abstract
The focus of the study was to identify the stress strain behavior of geo polymer concrete and salient parameters that influence the mixture proportions and the properties of low calcium fly ash- based geo polymers concrete. To develop geopolymer concrete the chemical proportions are alkaline liquid solution/fly-ash ratio=0.5, Sodium silicate/sodium hydroxide ratio=2.5,16M NaOH and SiO2/Na2O ratio=2.0. The geopolymer concrete mixes have shown improved stress values for the same strain levels compared to that of controlled concrete mix. Normalized stress strain curves are used to compare the behaviours of geopolymer concrete. It can be observed that geopolymer concrete has improved strains for the same stress when compared to conventional concrete. Geopolymer concrete mixes have shown improved stress values for the same strain levels compared to that of controlled concrete mixes.
Highlights
Investigations on alkali activated binder (AAB) date back to the beginning of the 20th century thanks to pioneering work by Kühl in Germany which was on vitreous slags activated with alkali materials [1]
The Basic Materials required for Geopolymer Concrete are Fine Aggregate, Coarse Aggregate, Fly ash, Sodium Silicate (Na2SiO3), Sodium Hydroxide (NaOH), Ground Granulate Blast Slag (GGBS)
Sodium Hydroxide is in the form of Pallets and Sodium Silicate is in Liquid Form
Summary
Investigations on alkali activated binder (AAB) date back to the beginning of the 20th century thanks to pioneering work by Kühl in Germany which was on vitreous slags activated with alkali materials [1] It was only in the last decade that they gained international attention as alternative to Portland cement (PC) based binders, mainly due to the potential reduction of associated CO2 emissions and for their inherent properties such as high strength, good resistance to chemical degradation, thermal stability and fire resistance, among others [2]. Factors such as dosage of alkali solutions, water content, elevated curing temperatures (60 to 100 °C) and curing time are considered to be the important factors influencing the properties of geopolymer or alkali activated concretes (AAC). The focus of the study was to identify the stress strain behavior of geo polymer concrete and salient parameters that influence the mixture proportions and the properties of low calcium fly ash- based geo polymers concrete
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