PLASTIC SHRINKAGE AND STRENGTH PARAMETERS OF HIGH VOLUME FLY ASH SELF COMPACTING CONCRETE ADMIXED WITH ALKALI RESISTANT GLASS FIBRES

Self-Compacting Concrete (SCC) requires a high slump that can easily be achieved by addition of super plasticizers to a concrete mix and special attention has to be paid to mix proportioning [1]. As the usage of cement increases cost of concrete will increase and also it results in greater temperature rise with the atmosphere through the evolution of greenhouse gases.The use of any supplementary cementitious materials which also acts as mineral admixture such as fly ash or blast furnace slag or limestone filler could increase the slump of the concrete mix without increasing its cost lowering the heat of hydration. Mixes having more than 50% replacement of cement with fly ash are termed as high volume fly ash self-compacting concrete (HVFASCC). The high percentage of fly ash replacement in concrete results in cost effectiveness of concrete and also improves various fresh properties of concrete [2].Shrinkage is the volumetric contraction of concrete due to evaporation or hydration of cement. There is an increase of shrinkage strains in SCC due to high cement content [3].