Strength And Workability Studies Of Geopolymer Concrete With Recycled Coarse Aggregate And Quarry Stone Dust

Abstract

Concrete is one of the construction materials which is used widely due to its structural strength, durability, stability and reliability. Concrete consumes large quantity of Ordinary Portland Cement (OPC).  The manufacturing of OPC effects the environment  by  releasing  huge  quantity  of  CO2   in  to  the  atmosphere.  To  minimize  the  effect  that  caused  by  the  OPC  in traditional  concrete  to  the  environment,    this  paper  presents  a  special  concrete  i.e.,  Geo  polymer  concrete  in  which  all  the traditional ingredients are replaced by by-products i.e., OPC by Fly ash obtained from thermal power plant, Fine Aggregate by Quarry  stone  dust  obtained  from  stone  crushing  units  and  Coarse  Aggregate  by  Recycled  coarse  aggregate  obtained  from demolished  wastes.  Sodium silicate  solution(Na2SiO3)  and  sodium  hydroxide(NaOH)  are  the  alkaline  solutions  which  act  as activators for fly ash to gain the binding property. In this work OPC is completely replaced with Flyash which is a by-product thus reducing the consumption of  natural  resources,  energy  and  also  make  it  environment  friendly.  Coarse  aggregate  is completely replaced with recycled coarse aggregate and Natural Fine Aggregate (Sand) is replaced partially by quarry stone dust (QSD) in proportions ranging from 0 to 100%. The molarity of NaOH used in this work is 12M. As Geo polymer Concrete is a special concrete and as no separate mix design procedure is available, the proportions of the materials are obtained by rigorous trial and error method. The structural strength studies such as flexural strength, compressive strength and split tensile strength are conducted and the results are analyzed.