Experimental Investigation on Steel Fibre Reinforced Fly Ash (Class-C) Based Alkali Activated Geo-Polymer Concrete

Abstract

Geo-polymer concrete (GPC) are representing the most promising green and eco-friendly alternative to Ordinary Portland cement (OPC). This paper presents the results of an experimental program on the mechanical properties of steel fibres reinforced geo-polymer concrete (SFRGPC) such as Compressive strength, Split tensile strength, Flexural strength, Water absorption, Alkali attack, Acid attack and Abrasion resistance. SFRPGPC contains Fly ash (Class- C), alkaline liquids, fine aggregate, coarse aggregate and steel fibres. Alkaline liquid to fly ash ratio was fixed as 0.45 with 100% replacement of OPC. For alkaline liquid combination ratio of sodium silicate to sodium hydroxide solution was fixed as 2.5. Steel fibres was added to the mix in volume fractions of 0%, 0.25%, and 0.5% by volume of geo-polymer concrete. Specimens were subjected to air curing at room temperature. Based on the test results Compressive strength, Split tensile strength and Flexural strength showed maximum values for 0.5% dosage of steel fibre. Hence , it is concluded that the addition of 0.5% steel fibres dosage increase the strength of geo-polymer concrete which is due to the hooked end shape of steel fibres, which provide better adhesion between fibre and concrete and can be used in the marine environment. Keywords : fly ash (Class C), steel fibre, flexural strength, compressive strength, split tensile test DOI : 10.7176/CER/11-3-03 Publication date : April 30 th 2019