Effect on Mechanical Properties of Concrete Using Recycled Coarse Aggregate Replacing Stone Chips

Abstract

Due to the scarcity of stone chips, construction works are obstructed day by day specially in
developing countries. However, many infrastructures are broken because of they have
reached at design period or other reasons. They have no salvage value but produced a huge
dust on the environment. The aim of this works is to produce concrete with the recycled
materials and to compare the mechanical properties with concrete made with stone chips. In
sub-continent clay burnt bricks are available and aggregate produce from bricks are also
available. For this reason brick aggregate has been used in the research work. Several
physical properties were studied such as gradation, unit weight, specific gravity, and water
absorption capacity of recycled aggregate. In addition, compressive strength, splitting tensile
strength, flexural strength, modulus of elasticity, were determined as the mechanical
properties of concrete made with recycled aggregate by replacing stone chips. Forty eight
(48) cylinders of 4 in x 8 in and twelve (12) prisms of 18 in x 4 in x 4 in with an effective
length of 13.5 in have been used. 10%, 20%, 30% and 100% recycled coarse aggregate have
been used replacing stone chips for the research works. All tests have been carried out
according to ASTM standard requirements. Water cement ratio was kept as 0.47 throughout
the work. It has been seen that 10% percent replacement of recycled aggregate give optimum
value of given mechanical properties which indicate recycled aggregate can widely used for
construction