Effect Of An Inorganic Compound On Geopolymer Concrete And Ordinary Portland Cement Concrete

Abstract

The main problems with durable concrete constructions are attacks by sulphates and chlorides on concrete. Thus, the impact of concrete strength characteristics is based on the addition of fly ash exposed to the environment used as sulphate and chloride solution as the primary goal of this research work. In this research work, geopolymer concrete (GPC) is used instead of ordinary Portland cement (OPC). The concrete composition is prepared with geopolymer varies. Samples are demolded and then submerged in water for a full 28 days to cure. Following this, the samples are placed in different solutions of 10% sodium chloride (NaCl) and 10% sodium sulphate (Na₂SO₄) for hardening times at 28, 56, and 90 days respectively. A degree of damage, variation in compressive strength, and weight change were used to assess the impacts of sulphate and chloride on the concretes. After 90 days, the exposure of fly ash to concrete significantly improved its compressive strength at 33.11% as compared to the strength of 10% NaCl solution, water and OPC, respectively. In contrast to the OPC, the 10% NaCl solution decreased the compressive strength of fly ash-containing GPC after 90 days of exposure. In comparison to other models, the maximum ultrasonic pulse velocity of GPC-7 was attained at 4430 m/s. The minimal charge cleared in the GPC-7 fast chloride permeability test is 1045 coulombs. According to this study, adding fly ash to concrete as an additional cementitious material may help lessen the harmful impacts of sulphate and chloride salts. The study's findings suggest that adding ground fly ash to concrete as an additional cementitious element strengthens the material's durability to harsh environments.