The effect of Ground Granulated Blast Furnace Slag (GGBFS) on Portland cement type II to compressive strength of high quality concrete

Abstract

Failure of concrete in the environment which containing sulphate causes damage to the cement bonds. One of environment that contains sulphate is peatlands. Peat water has a low acidity (pH) that it can damage the concrete slowly from the edges and corners with release of granules and becomes a porous. On this research, Ground Granulated Blast Furnace Slag (GGBFS) is a mineral additive that used as an additive to reduce the damage. The purpose of this research was to determine the effect of using variations of GGBFS and the optimum percentage of using GGBFS on Portland cement type II. This research outline divided into several stages, i.e. material testing, manufacturing cylindrical specimens with addition 0 %, 2%, 4%, and 6% of GGBFS and concrete age 7,14, 28 days, testing of specimens and analysing test result. Also, the treatment of specimens carried out using peat water. The result show that GGBFS increased compressive strength of the concrete, however it decreased at addition 2 % and 6 % of GGBFS on 7 days with amounting to -14.62% and -3.47%. The optimum percentage is concrete with variation of 4 % GGBFS and the minimum percentage is concrete with a variation of 0 % GGBFS.

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