A Study on Economic Beam Section by Placing Light Weight Material below Neutral Axis

Abstract

With increasing demand and consumption of cement, researchers use the various waste materials to replace the concrete. As the part above neutral axis is in compressive and the part below neutral axis is in tension in case when a beam subjected to sagging moment and vice a versa if a beam subjected to hogging moment. So the concrete below neutral axis can be replaced by any materials. There are various materials which can be replace the concrete in tension zone. There are various materials that we can use such as bricks, clc blocks, wooden blocks etc. The materials should be such that the bond between the materials and steel should be strong enough same as between the steel and concrete. This type of beams are used anywhere but for small sections the casting of this sections is difficult and time consuming. After using lightweight materials the dead weight of section is reduced by 16%. The cost of the section is also reduced by 9%. Behaviour of reinforced concrete infilled beams is similar to that of reinforced concrete beams. Presence of lightweight materials in the low stressed zone has not caused significant reduction in strength of reinforced concrete beams. During this project work no of beam having dimension (1100x150x300)mm for different infilled material tested to compare the various properties and cost analysis with conventional beam.