Study on Behaviour of Structural Elements Using Fly Ash Cenosphere in Concrete Under Elevated Temperature

Abstract

Development and implementation of sustainable concrete has emerged as a critical focus due to usage of natural resources. This has led to the use of alternative materials like industrial by-products in concrete promoting sustainability and reducing the environmental footprint of construction. Also, concrete containing industrial by-products when subjected to high temperatures, the response of the material differs significantly from that of conventional concrete. newlineFly ash Cenosphere (FAC) a lightweight, hollow, and spherical particle found in fly ash, is one such by-product formed under high-temperature conditions during coal combustion is a thermal resistant material. Similarly, Alccofine, derived from slag generated during steel manufacturing, is an industrial by-product with pozzolanic properties, known for its high calcium content and ultrafine particle size. The key idea of the research is to develop a sustainable concrete mix using industrial by-product, specifically FAC as a fine aggregate replacement and alccofine as a pozzolanic material. newlinePreliminary investigations were performed on the basic raw materials and M25 grade of concrete (CC) was formulated according to IS 10262 : 2019. Twelve different mixes with varying proportion of FAC from 5% to 100% as volume replacement to M sand was carried out. Mechanical tests such as compression test, split tensile test, flexural strength test was performed and 35% of FAC replacement was found to be optimized in Fly ash Cenosphere Concrete (FACC). After optimizing the FACC mix, Alccofine was replaced with varying range from 5% to 25% as a binder to improve the strength and durability of the FACC. Fresh and hardened concrete properties were studied and 15% of Alccofine was found have the maximum strength. Therefore, concrete with FAC with 35 % replacement and 15 % alccofine was considered to be the optimized mix (FACCAF) newline