Evaluating the Elastic Constants of Concrete, Modified with Fly Ash and Marble Waste, and Their Effects on High-Rise Buildings Using ETABS Software

Abstract

This study involves partially replacing coarse aggregate with marble waste products, and partially replacing cement with fly ash, in order to obtain the best results. This study aims to determine how the use of these waste products affects the mechanical properties of the resulting concrete, which could have valuable implications for sustainable construction practices. Different samples were prepared by adding marble waste products, marble slurry powder, fly ash, and a combination of these in the concrete. The modulus of elasticity and Poisson’s ratio for the samples were calculated, and it was found that the samples with admixtures had lower moduli of elasticity and higher Poisson’s ratio values than did the conventional concrete mixture. Based on the values of elastic constants E and µ of the general and modified concrete mixtures, two structures are modelled for each concrete mixture and simulated using ETABS Ultimate software to evaluate and compare the practical applicability of the modified concrete mixtures. Both of the envisaged buildings are considered identical, having shear walls placed symmetrically. The response of the structure was analysed by applying earthquake load, wind load, and respective combinations according to IS codes. The storey displacement and storey stiffness under the lateral load and load combination were determined. The results showed that the modified concrete had comparable storey displacement and storey stiffness values to those of conventional concrete. The results indicate that the use of admixtures in concrete has several benefits, including improved workability, as well as adequate strength and durability, including resistance to deformation, as compared to conventional concrete.