Study of Packing Concepts in SCCS using Different SRMs and Mixing Regimes

Abstract

This study discusses the role of Limestone powder (LSP, Lafrage), Ground Granulated Blast Furnace Slag (GGBFS, Lafrage) and Silica Fume (SF 920, Elkem) on fresh and hardened properties / behavior of Self compacting paste systems (SCPs) along with discussion about the effect of mixing energy imparted by Hobart and Eirich Mixersto Self Compacting Mortar systems (SCMs). The results are based upon the study of flow characteristics, hydration kinetics, volume stability, water absorption, strength development and study of microstructure through scanning electron microscopy (SEM) and X-Ray diffraction. Study also encompasses the role of particle size distribution (PSD) for aggregate, some discussion about packing models and effect of various values of “q” Andresean & Andersen equation and overall effect on strength development of SCM with varying grading. The effect of mixing energy was found to be evident on strength development and microstructure also It was found that the behavior of self compacting concrete is affected by the size, distribution of voids and the porosity of aggregate mixture. Optimum packing is not only economically beneficial but a minimum of binder in concrete results in less shrinkage and a more dense, strong and more durable concrete type.