Due to enormous growth in industrial development, the consumption of cement is substantially increased in the recent times and the cement manufacturing industry produces annually about 1.35 billion tons of the greenhouse gas emissions which are about 7% of the total greenhouse gas emission by man‐made to the atmosphere. At the same time, the thermal power plants have been generating huge quantity of fly‐ash, which is not being recycled properly. This creates huge burden on solid waste management. Hence, to minimize the emission of CO2 from cement industry and to increase the utilization of fly‐ash, a geopolymer technology is one of the viable solutions. In terms of global warming, the geopolymer technology‐based fly‐ash activated by an alkaline activators not only have potential to significantly reduce carbon footprint of ordinary portland cement concrete, but also shows considerable promise for applications in concrete industry as an alternative binder to the Portland cement. This paper provides a brief status of fly‐ash based geopolymer paste and concrete, encapsulates, and analyses critically the most significant research findings on various properties of geopolymer concrete (GPC) over the past two decades. Also, it identifies the important factors to be considered in improving the performance of GPC at elevated temperatures as well as at ambient temperatures. Collation and analysis of more than 100 research papers in this area may provide a valuable stating document for further research.
Advancement of reasonable development materials has been the focal point of exploration globally in recent times. Considering the current scenario, finding options in contrast to Ordinary Portland concrete (OPC) is of incredible importance as a result of high CO2 emission during its production. Accordingly, supplementary material was acquainted as alternative to cement for concrete production. Utilisation of fly ash is eco-accommodating and furthermore saves cement cost. It is wealthy in silicate and alumina and it responds with alkaline solution to produce alumina silicate gel which helps in fastening the concrete ingredients. The fly ash based geo polymer offers better protection from the forceful condition and elevated temperature than the ordinary cement. Some factors like NaOH Molarity, NaOH/Na2SiO3 percentage assume a fundamental element in the development of the geopolymerization reaction became concept of. The investigation on the fly ash based geo polymer profoundly did in the present work, besides the impact of elevated temperature and time are not exceptionally recorded in the available literature. In this study the effect of curing temperature and curing time on the compressive strength (3, 7 and 28 days) of GPC at a constant molarity of NaOH and alkaline solution ratio and compare with controlled concrete. In the present work 10 molars of NaOH and 1:1.5 alkaline solution ratio was considered by varying curing temperature 60°, 90° and 120° C and 24, 48 and 72 hours of curing time. M30 grade concrete mix with the equivalent GPC is developed. From the experimental results, it was found that compressive strength was effected by curing temperature and curing time at 3, 7 and 28 days and maximum compressive strength i.e., 53.46 MPa was obtained at higher curing temperature (120° C) and lower curing time (24 hrs). Also, when compared with control concrete, the compressive strength is higher for GPC was observed.
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