Concrete is the most common material used in the construction of civil engineering structures and the global demand for concrete is significantly increased due to infrastructure growth worldwide. The production of Portland cement which is the main ingredient of concrete is not only costly but energy intensive. It consumes approximately 7.0 GJ (Gigajoule) of energy per ton of cement production and also cement production process results in the emission of large amount of CO2, a greenhouse gas. To overcome these problems, there is a need to find some replacement to some extent. By the use of green concrete, it is possible to reduce the CO2 emission in atmosphere towards eco-friendly construction technique. Fly ash, a much potential industrial waste product that replaces cement in the concrete, is discussed in depth in this particular paper. In this study, the potential use of siliceous/class F fly ash from power plant Kolaghat as a partial replacement of cement is studied. Concrete mix M20 is designed with water-cement ratio 0.42 by adding 50% of fly ash (Siliceous/Class-F) as a partial replacement of cement, without using any other chemical admixture. Six concrete cubes of size 150 mm x 150 mm x 150 mm were cast and tested for compressive strength at 28 days, 56 days and 90 days curing for all mixes. The analysis of results shows the promising values with respect to compressive strength as well as workability. Thus, green concrete may be used as a partial replacement of cement by means of fly ash as it is cheaper, because it uses waste products, saving energy consumption in the production. The result also shows that at initial stages strength gain is less for fly ash mixed green concrete and the strength is becoming higher at later ages. To overcome this delayed curing and lower initial values of compressive strength glass fibres are mixed with this high volume fly ash concrete. So the required compressive strength value is achieved within the curing time. Also the crack widths become lesser. Above all, glass fibre mixed high volume fly ash green concrete has greater strength and durability than the normal concrete using for ordinary civil engineering construction purposes.

HVFA mixed green concrete has manifold advantages over the conventional concrete. Since it uses the recycled aggregates and materials, it reduces the extra load in landfills and mitigates the wastage of aggregates. Thus, the net CO2 emissions are reduced. Since a huge quantity of cement is used in concrete in mass concrete construction and the cost of fly ash is negligible as compared to that of the cement, the use of HVFA concrete brings about a substantial saving in cement consumption and overall construction cost. HVFA mixed green concrete may be used in general RCC structures including road pavements, dam construction etc. without any risk of steel corrosion. The fly ash is an industrial waste and great hazard for our environment. The designers of concrete structures, therefore, must incorporate the use of fly ash in their structural concrete. It reduces the consumption of cement overall and has better workability, greater strength and durability than normal concrete. Only drawback of this concept is the delay in initial strength gain and thus the curing time is extended upto 90 days instead of 28 days. This problem can be overcome by the use of glass fibre in the concrete mix design. Then the strength gain will be same as normal concrete characteristic strength gain timings. Also the cracks and shrinkage effects will be less and the HVFA GFRC concrete will be more durable for longer period of time. By using this concept we can save environment and can give this environment to our next generation.

[1] Ananth Kamath K & Mohammad Suhail Khan (2017), “Green Concrete”, International Journal of Interdisciplinary Research (IJIR), Volume: 03, Issue: 1, ISSN: 2454-1362, PP: 685-693. [2] Mr. Vardhan Nagarkar, Mr. Sanket Padalkar, Ms. Samruddhi Bhamre, Mr. Akshay Tupe (2017), “Experimental Study on Green Concrete”, International Journal for Research in Applied Science & Engineering Technology (IJRASET), Volume: 05, Issue: IV, ISSN: 2321-9653. [3] Pandurangan S,Vimalanandan G, Dr. S. Senthil Selvan (2015), “Performance of High Volume Fly Ash concrete”, International Journal for Innovative Research in Science &Technology (IJIRST), Volume: 01, Issue: 11, ISSN: 2349-6010, PP: 247-250. [4] S. S. Awanti, Aravinda Kumar, B. Harwalkar (2016), “Mix Design Curves for High Volume Fly Ash concrete”, International Journal of Civil and Environmental Engineering (World Academy of Science, Engineering and Technology), Volume: 10, Number: 10, PP: 1310-1315. [5] R. D. Padhye, N. S. Deo (2016), “Cement Replacement by Fly Ash in Concrete”, International Journal of Engineering Research (IJER), Volume: 05, Issue: 01, ISSN: 2319-6890, PP: 60-62. [6] Surabhi, Anil Kumar Chaudhary (2015), “A study on the utilization of fly ash in concrete”, Environmental Science An Indian Journal (ESAIJ), Volume: 10, Issue: 02, ISSN: 0974-7451, PP: 41-45. [7] Saman Khan, Roohul Abad Khan, Amadur Rahman Khan (2016), “Compressive Strength behavior of High Volume Fly Ash Concrete with varying Percent of Stone Dust and Recycled Aggregates”, International Journal for Research in Technological Studies (IJRTS), Volume: 3, Issue: 8, ISSN:2348-1439, PP: 26-28. [8] IS 10262: 2009, “Concrete Mix Proportioning – Guidelines”. [9] IS 456-2000,“Plain & Reinforced Concrete Code of Practice”. [10] IS: 8112-1989, “43 Grade Ordinary Portland Cement (Reaffirmed 2005)”. [11] IS 383-1970, “Specification for Coarse and Fine Aggregates”. [12] IS 2386 Part III-1963, “Methods of Test for Aggregates”. [13] IS 3812 (Part-1)-2013, “Pulverized Fuel Ash- Specification”. [14] IS 1727-1967, “Methods of test for pozzolanic materials”.

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