STUDY OF BLENDED CONCRETE UNDER IMPACT LOAD

Abstract

The issue of the use of Supplementary Cementitious Materials or SCMs used as a partial replacement of cement in the concrete is gaining importance nowadays. Such materials not only reduce the consumption of cement but also improve the properties of concrete. Further, SCMs like Flyash, Ground Granualated Blast Slag, Rice Husk ash etc are the byproducts from the industries. This solves the disposal problem and proves to be a positive impact on environment. The present study aims at studying the effect of Impact load on the Blended Concrete Cubes. Cement in the M30 grade concrete is replaced, by 15% Flyash and 50% Blast slag. The 3 Blends of concrete thus prepared have been subjected to Impact load. Impact loads are sudden load which act on the civil engineering structures with a very small time of contact. Significantly high energy is transferred by the impactor in a very small amount of time. This increases the severity of damage caused. Instances of such Impact loads include falling of objects from heights, falling of one building over another during the earthquake, impact caused by waves on bridge piers etc. The effect of the impact load has been studied with the help of EMI technique. EMI technique is a novel technique utilizing the admittance signature obtained from new age active sensors – peizosensors, to quantify the damage caused in the different composition of the concrete on varying the number of impacts and height of impact. FE model of the 3 blended concrete cubes is made on the ANSYS software. A spherical impactor of 5kg weight is modelled to be dropped from 2.5m and 3m height. FE Analysis is done to find the equivalent (von mises) stress , equivalent (von mises) strain and normal strain generated in the three models of cube.