EVALUATION OF CEMENTING EFFICIENCY OF QUATERNARY BLENDED HIGH STRENGTH SELF COMPACTING CONCRETE

S Shrihari, M V Seshagiri Rao, V Srinivasa Reddy

Abstract: The utilization of Supplementary Cementitious Materials (SCM) is well accepted because of the several improvements possible in the concrete composites, and due to the overall economy. Research work till date suggests that use of SCMs improve many of the performance characteristics of the hardened concrete. From the present investigations it is found that the compressive strength of metakaolin based high strength Self Compacting Concrete( SCC) depends both on the age and the percentages of replacement levels of Metakaolin, Micro Silica and Fly ash combination. The proposed work attempts to quantify the strength of Metakaolin, Silica fume and Fly ash combinationat the various optimum replacement levels and evaluate their efficiencies in SCC. In recent years replacement of cement with optimum combination of SCMs has emerged as a major alternative to conventional SCC and has rapidly drawn the concrete industry attention due to its cement savings, energy savings, and cost savings, environmental and socio-economic benefits. The present work proposes to report the results of an experimental study conducted to evaluate the synergic effects of Metakaolin, Micro Silica and Fly ash combinationcompressive strength of hardened Quaternary blended high strength SCC of M80 grades at different ages. The strength efficiency factor ‘k’ are evaluated usingBolomey’s empirical expressions which are frequently used to predict the strength of concrete theoretically.The overall strength efficiency was found to be a combination of general efficiency factor, depending on the age and a percentage efficiency factor, depending upon the percentage of replacement of MetaKaolin, Silica fume and Fly ash combination. The experimental work on Micro Silica (MS) and MetaKaolin (MK) concrete found that the computed efficiency factor varied with pozzolan type , replacement level and age at 90 days . The value of k range from 1.71 to 1.84 for micro silica and MetaKaolin for 7 days . 1.16 to 1.11 for 28 days and 1.11 to 1.07 for 90 days in ternary blended SCC .The value of K quaternary blended SCC range from 1.88 for 7 days , 1.6 for 28 days and 1.19 for 90 days with 34% of waste industrial by product

Keywords: Self Compacting Concrete, Metakaolin, Micro Silica, Fly Ash, Efficiency Factor, Ternary Blended SCC, Quaternary Blended SCC

DOI: https://doi.org/10.15623/ijret.2016.0532037