Abstract: In this paper, mechanical and durability properties of cement mortar used for plastering over reinforced cement concrete exposed surfaces like sunshade, slabs, beams etc., near marine environment were studied by partial replacement of river sand which was used as fine aggregate by incorporating purified sea sand(S) as filler at various percentage of 5, 10, 15, 20 and 25 and carbonated coconut shell ash(CA) as a pozzolanic material at 0.5%, 1%, 1.5%, 2%, and 2.5%. Finally the mortar properties were improved using Azadirachta Indica extract (U) at the percentage of 0.5, 1, 1.5 and 2 in order to improve the durability, so as to minimize the corrosive effect of steel in RCC. The mechanical properties were investigated by compression test and flexural strength test and the durability characteristics were evaluated by the resistivity test of mortar. The results revealed that, the mechanical properties were decreased and the durability property was significantly improved while substituting sea sand and hence sea sand of 15% was considered for further quality enhancement. For further improvement by substituting CA of 1.5% revealed better results and Azadirachta Indica Extract of 0.5, 1.0, 1.5 and 2% gradually improved the mechanical property and 1% of extract considerably improved the durability property of CM. Significant improvement in the durability test results revealed that, there was high reduction in permeability and hence the corrosion of steel in RCC can also be reduced while coating with mortar.
Keywords: Sea Sand, Carbonated Coconut Shell Ash, Azadirachta Indica.
Title: Experimental Study on the Properties of Cement Mortar with Various Admixtures
Author: G. Jein Jenish, P. Shakivel
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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