Investigative Learning on Behavioral of Ternary Blended Self-Compacting Geopolymer Concrete

Abstract

Basic concept of choosing self-compacting concrete is to reach the three parameters that is followability character, passing character and minimizing the segregation without any external forces. The production of cement in large quantities leads to so many disorders in the environment and nature balance. In this view the concept of mineral admixture with same pozzolonic properties like fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), Metakaolin (MK), and rice husk ash (RHA) are using as a binder material in the concrete as a partial replacement of cement. The preparation of concrete total replacement of OPC with combination mineral admixtures in the presence of alkaline activator solution is the new technique, and this shows good mechanical properties at oven curing. Due to the high viscosity in nature the geopolymer concrete fails in the lack of compaction. To compensate this issue the self compacting geopolymer concrete has been introduced. SGPC doesn’t require any additional arrangement for the compaction, by its own weight it can be done mechanically. To achieve the optimum strengths and serviceability in concrete with these mineral admixtures the NaOH and Na2So3 solution to add and they get geopolymer concrete, but this required compaction. The new concept in concrete is Self-compacting geopolymer concrete was designed with different proportions of the mineral admixtures. To achieve the workability and passing abilities of the SGPC the chemical admixture is taken in to the consideration. In this investigative study replacement of cement in concrete by GGBS, Fly ash and Silica Fume are taken. The replacement of GGBS with cement in all mixes is kept constant as 60% and the Fly Ash and silica Fume were taking in the 40:0; 30:10; 20:20; 10:30; 0:40 ratios. Fresh concrete properties of the SGPC were tested slump cone, T50 value, L-box and verified with these values with the EFNARC guidelines. For this test procedure M25 grade ternary blended SGPC is taken with GGBS, Fly ash and Silica fume are taken as complete replacement instead of binder as cement. Compressive strength values of SGPC mix at optimum were determined at different curing periods. From the test results, it is observed that the optimum replacement of Fly ash and Silica fume is 30% and 10% with 12M Alkaline Activator Solution.