Performance Evaluation of Structural Lightweight Concrete Using Jhama Brick as a Partial Replacement of Coarse Aggregate

Abstract

Through the ancient time structural lightweight concrete has been used successfully all over the world due to having its pleasant property of reducing dead load of multi-storied buildings which is very much important for high rising structures. This research represents the experimental works on the structural lightweight concrete to observe the cost and the physical properties using jhama brick (also known as over burnt brick) chips as partial replacement of coarse aggregate. For producing C-35 grade concrete, jhama brick chips was used for the partial replacement of coarse aggregate by 0%, 5%, 10%, 15%, 20%, 25%, and 30% weight of coarse aggregate. For this purpose, 21 sets of cylinders (100 mm x 200 mm) were prepared. Slump tests were carried out for each mix in the fresh state and 3, 7 and 28 days of compressive strength tests were also performed in the hardened state. The 28-days compressive strength of concrete with 0%, 5%, 10%, 15%, 20%, 25%, and 30% replacement of jhama brick chips were 37.12, 36.37, 34.23, 33.01, 30.89, 30.50, and 21.98 MPa respectively. The unit weight of concrete with 0%, 5%, 10%, 15%, 20%, 25%, and 30% replacement of jhama brick chips after 28-days curing were found 2409.3, 2379.2, 2286.9, 2230.2, 2197.0, 2104.1, and 2094.9 kg/m3 respectively. According to ASTM C 330, the compressive strength of concrete with jhama brick chips up to 25% of coarse aggregate fulfilled its requirements.