Title : STUDY ON DEVELOPMENT OF FLY ASH BASED GEOPOLYMER CONCRETE AND EVALUATING ITS STRENGTH AND DURABILITY PROPERTIES UNDER AGGRESSIVE ENVIRONMENT
Authors : Neetu singh,Sameer Vyas,R.P.Pathak,Pankaj Sharma and N.V.Mahur
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Price : 250
Abstract : Applications of fly ash based geopolymer concrete is an innovative approach in some case specific applications in civil engineering structures since the conventional cement production is highly energy intensive. On the other hand in order to promote an efficient use of fly ash for civil engineering applications the research effort is to develop cementless alkali-activated concrete using 100% fly ash as a binder. The present study is aimed to developed fly ash based alkali activated concrete for wider applications of geopolymer binder towards a cost economic construction practice. This also envisages the reduction of global warming due to carbon dioxide emissions from cement plants. Geopolymer is a class of aluminosilicate binding materials synthesized by thermal activation of solid aluminosilicate base materials such as fly ash. These binders are currently attracting widespread attention due to their potential utilization as a high performance, environmental friendly and sustainable alternative to Portland cement. The mortar has been prepared with ennore sand and class F fly ash mixed with alkali activator fluid consisting of sodium silicate and sodium hydroxide of different concentrations. A high strength geopolymer was synthesized by proper controlling conditions including Fly ash-fluid ratio, curing temperature and period of curing etc. The optimum compressive strength was obtained at curing temperature of 1200C for 72 hrs. The newly synthesized geopolymer then subjected to strength properties evaluation by measuring their compressive strength. The geopolymer cubes were exposed to different aggressive chemical environment in order to evaluate their performance. The strength of geopolymer cubes were also tested at different elevated temperature for their fire resistant properties and then the specimens were subjected to various tests for determining compressive strength and other physico-chemical and mineralogical changes. It was observed that fly ash-based geopolymer concrete has an excellent resistance to acid and sulphate attack when compared to conventional concrete. The geopolymer cubes were also perform well at higher temperature and retain desirable strength compare to OPC cubes. The effect on compressive strength and other parameters including structural and mineralogical changes for different exposures environments were further evaluate and confirm with the help of diagnostic equipment such as X-ray diffraction study (XRD.