Effect of Combination of Mineral Admixtures on the Properties of Self Compacting Concrete

Abstract

Self-compacting concrete abbreviated as SCC is a recently developed concept in which the ingredients of the concrete mix are proportioned in such a way that the concrete is compacted by its own weight without or little vibration, assuring complete filling of formwork even when access is hindered by narrow gaps between reinforcing bars. Cement is the most important constituent material, since it binds the aggregates and resists the atmospheric action. Manufacturing of cement emits about 0.8 ton of CO₂ in atmosphere for every ton of cement manufacture. The utilization of supplementary cementing materials as natural pozzolans like dolomite powder, fly ash, GGBS etc. in concrete production is one of the solutions to reduce the cement content. This paper deals with the fresh and hardened properties of self compacting concretes made with combination of GGBS and dolomite, GGBS and fly ash as cement replacement in different amounts. The trial mixes are formed based on IS 10262: 2019. The workability properties of the mixes are evaluated by workability testes such as slump flow test, V-funnel test, L-box test. The hardened properties of the concrete are evaluated by compressive strength, flexural strength and tensile strength. The successful utilisation of fly ash, GGBS and dolomite powder in SCC mixes would not only lower the cost of SCC, but could also provide a solution to the disposal and environmental problems connected with these materials.