Effects of Varying Molarity in Fly Ash Based Concrete

Abstract – To use waste materials as alternatives in construction industry is an innovative thought. Now a day’s many wastes are used in construction industry like in cement production, for manufacturing of concrete and also for manufacturing of bricks. In all types of thermal power plants large amount of fly ash is librated. Which causes air pollution. So to minimize the quantity of generated waste material we are using it in construction. In this paper fly ash from different sources are taken to prepare the concrete. And in this cement is 100% replaced and for creating the bond in it NaOH and Na2SiO3 solution is used. Which form geopolymerisation process and acts as a replacement of cement in the mix. In the present work, OPC is totally replaced, But cement is working as a binder in the concrete mix. The main task is now to form another binder in the mix, as there is 0% cement. Hence, NaOH (Sodium hydroxide), Na2SiO3 (Sodium silicate in the form of flakes), super plasticizer (Sulphonated naphthalene polymer based super plasticizer) is used in the distilled water. By using NaOH & Na2SiO3 in distilled mix in the concrete, polymerization process takes place which form gel in the mix and which works as a binder in it, after making concrete specimens of 8M (Molarity) & 12M (Molarity) with the different fly ashes, specimens are treated with ambient (temperature) curing at 7 days and 28 days. And at the age of 7 and 28 days strength is tested (Compressive and Flexural strength) After the (specimens) test results, it is concluded that NTPC Sipat fly ash based specimen gives more satisfactory results of compressive and flexural strength as compared to GMR Tilda fly ash based specimen. And also at 12 Molarity concentration of NaOH solution compressive and flexural strength increases as compared to 8 Molarity. Hence it is said that while increasing the concentration of NaOH solution in terms of Molarities (8M to 12M), strength of the specimens increases.

Key Words: Molarity, fly ash basedconcrete, Ready Mix Concrete, Ordinary Portland Cement, ambient curing.

INTRODUCTION n this work total 36 specimens are casted in which concrete is made with different sources of fly ash and with different molarity. In this two molarities are taken one is 8M and another is 12M. Mix is prepared of M25 & M20 grades of concrete
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