Pollution Research Paper

Vol.32, Issue 02, 2013; Page No.(305-316)

INFLUENCE OF BRACKISH WATER IN THE STRENGTH PROPERTIES OF CONCRETE COMPOSITES WITH REPLACEMENT OF CLASS C FLY ASH AND SILICAFUME

K. SIVALINGAM, S. JAYANTHI, K. JAGADEESAN AND S. SAMSON

Abstract

In this research work, the effect of brackish water in the strength properties of concrete was investigated. The results of experimental investigation in strength of concrete with partial replacement of cement when prepared with treated water and with groundwater are presented in this paper. The concrete grade of M30 has been selected and designed as per Indian Standard method. The specimens based on control mix have been cast without fly ash and silica fume. Cement was replaced by 0%, 10%, 20%, 30%, 40%, 50% and 60% of fly ash by the weight. 20 % of silica fume was added to all those mixes and further replacement of cement was tried. Necessary tests were carried out and results were compared for both concrete prepared using treated water and using brackish water. Workability was found from slump test. Tests for compressive strength were carried out on specimens at the age of 3, 7, 14 and 28 days. The split tensile strength and bond strength test were also carried out at the age of 28 days. The results showed that the compressive strength of concrete for control mix prepared using treated water is 45.6 N/mm2 and using groundwater is 31.96 N/mm2 . The property indices of both fresh and hardned concrete have higher values in the specimens prepared using treated water than in the specimens prepared using groundwater. From this study it was concluded that 10% replacement of cement by fly ash contribute reasonable strength along with 20% of silica fume when groundwater was used to prepare concrete. The presence of chemical parameters in brackish water influences the strength of concrete was presented in this paper.

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