AN INVESTIGATION ON THE EFFECTS OF PARTIAL REPLACEMENT OF RIVER SAND WITH MASONRY SAND ON THE PROPERTIES OF CONCRETE

ABSTRACT

Concrete plays a major role in the construction industry and a large volume of concrete is being used globally. River sand, which is one of the constituent materials used in the production of conventional concrete, has become expensive due to high transportation costs. Furthermore it has become very scarce and poses negative impacts to the environment with its extraction. In view of this, there is a need to identify suitable alternative material from industrial processes in place of the river sand. Masonry sand which is a residue waste material after the extraction and processing of rocks to form various sizes of ballast can be used as an alternative.

 In this study the feasibility of the use of masonry sand for concrete class 30 was investigated. A nominal mix proportion of 1:1:2 for concrete class 30 with a water cement ratio of 0.42wasused. The properties of the concrete made with different ratios of sand to masonry sand (sand: masonry sand) 100:0, 75:25, 50:50, 25:75 and 0:100 were investigated. The compressive strength was measured at 7 and 28 days with the tensile strength at 28 days. The highest strength was achieved at 50% replacement with an average of 35.33N/mm2 compressive strength and 3.46N/mm2 tensile strength.   

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