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Research Article

An experimental study on strength of concrete having calcium carbonate as a partial replacement material to cement and natural river sand

Konala Harish, L.N.K.Sai Madupu, S.V.Satyanarayana

Department of Civil Engineering, R.V.R & J.C College of Engineering, Guntur, India

Keywords

Abstract


Calcium carbonate powder; 

 Calcium carbonate sand;

Compressive strength; 

Flexural strength; 

Split tensile strength


Limestone is a sedimentary rock mainly composed of calcium carbonate mineral. Limestone is quarried abundantly in and around Piduguralla region, Andhra Pradesh, India. Good quality limestone is used to manufacture cement. Calcium oxide is used as white wash which is obtained by heating calcium carbonate. Limestone, as fine powder or as coarse grains is also used as base for paint. In this research, the calcium carbonate mineral in the form of limestone procured from Piduguralla region is used in concrete in two different forms i.e as powder form and as sand form. The cement was partially replaced with the calcium carbonate powder when the calcium carbonate is used as fine powder. The natural river sand was partially/fully replaced with calcium carbonate sand when the calcium carbonate is used as sand (coarser) form. Experiments on cube, cylinder and beam specimens are conducted using Universal Testing Machine to establish compression strength, split tensile strength and flexural strength of concrete having calcium carbonate. The test results support the usage of calcium carbonate in concrete to enhance the strength of concrete. Up to thirty percent cement can be replaced with calcium carbonate powder without adversely affecting the strength of concrete. Natural river sand can be partially/fully replaced with calcium carbonate sand which in turn increases the strength of concrete, but the optimum percentage of replacement is fifty percent of natural sand.

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