DURABILITY PROPERTIES OF M25 GRADE SELF COMPACTING CONCRETE USING RECYCLED AGGREGATE AND MANUFACTURED SAND

Abstract

Self Compacting Concrete (SCC) is an innovative engineered material for industrial ecology which does not require compaction. SCC likewise alluded as self-consolidating concrete which can flow and consolidate under its own weight. It is sufficiently durable to fill the spaces of any size and shape without segregation and bleeding. Manufactured sand (MSand) and Recycled coarse aggregate (RCA) in M25 grade SCC used in this study have become the focus of interest and received the considerable attention because of environmental benefits. In this research, SCC mixes were prepared using 30% of class F fly ash as cement replacement and with different replacements of sand, MSand, coarse aggregate (CA) and RCA. With addition of super plasticizer, the concrete mix enriches the quality of workability. The present study focussed on fresh and durability properties of SCC. Test methods such as Slump flow, V-funnel and L-box were used to assess the fresh properties of SCC. Durability properties like weight loss, compressive strength loss after acid attack of mixes were studied after 28 and 56 days of immersion of cubes in 3% sulphuric acid (H2SO4) solution after 28 days of curing. The percentage of water absorption and resistance to chloride ion penetration were also studied after 28 and 56 days of curing.