Role of Alkaline Activator in Development of Eco-friendly Fly Ash Based Geo Polymer Concrete

Abstract

Ordinary portland cement (OPC) is conventionally used as primary binder to produce concrete. The amount of carbon dioxide released during the manufacture of OPC and the extent of energy required to produce OPC are the matters of environmental concern in view of global warming and the poor availability of power. Fly-ash, abundantly available byproduct of coal fired thermal power stations is posing great environmental problems through its disposal. Fly ash with combination of alkalis like sodium hydroxide and sodium silicate can produce binding material depending upon the characteristics of these ingredients. The possibility of eco-friendly use of locally available fly-ash with commercially available alkalis in the development of effective binder; and the effect of various parameters on the compressive strength of geo-polymer concrete is explored in the present paper. The laboratory investigations under ambient and oven dry curing conditions suggested that locally available low calcium fly-ash is suitable for development of geo-polymer concrete; and the compressive strength of geo-polymer concrete is a function of mass ratio of alkaline liquid to fly-ash, mass ratio of sodium silicate to sodium hydroxide and molar concentration of sodium hydroxide.

Review on Various Types of Geopolymer Materials with the Environmental Impact Assessment

“…The reduction in CO 2 emissions for geopolymer system is due to the use of minimum processed natural minerals and industrial wastes to form the binding agents. ETIC 2016 using this waste material as a component to produce the binder helps to mitigate the environmental problems and provides new environmentally friendly green concrete [25]. Table 3 shows the result of the environmental impact of various geopolymer materials and as reported by Habert et al [26], the main environmental impacts that might be affected by the three types of geopolymer materials are global warming potentials and human toxicity.…”

Design and Development of Green Eco-House

“…Once the mixtures are well-mixed, it will be transferred to our specified mould and inserted into the curing oven at 60 ̊ C for 24 hours. The molarity of sodium hydroxide and curing temperature directly affects the strength of geo-polymer concrete [6].…”

Review of Dolomite as Precursor of Geopolymer Materials

“…Joshi &Kadu [19] prepared the alkaline activator using commercially available Na 2 SiO 3 liquid and NaOH pellets which contain Na 2 O = 14.61%, SiO 2 = 25.18% and water = 59.99%. The alkaline solution was prepared with NaOH concentration varying from 8M to 16M and the mass ratio of Na 2 SiO 3 to NaOH varied from 1.75 to 3.0.…”