STUDIES ON EFFECT OF MINERAL ADMIXTURES ON DURABILITY PROPERTIES OF HIGH STRENGTH SELF COMPACTING CONCRETE

Abstract

To build high rise building by reducing column sizes and increasing available space, to built the super structure of long span bridges and to the durability of bridge decks a high strength is needed. High strength concrete was used in South Wacker in Chicago of 80 Mpa, Baynunah Tower in Abu Dhabi of 80 MPa and Frankfurt Trianon in Germany of 125 MPa. If high strength concrete is self-compacting, the production of densely reinforced building element from high strength concrete with high homogeneity would be an easy work. In the present investigation a rational mix design is established and self compactability testing methods have been carried out from the view point of making it a standard concrete by using mineral admixtures like micro silica and fly ash for imparting High Strength Self Compacting Concrete. The flow properties of resulting concrete is characterized in the fresh state by methods used for Self compacting concrete, such as Slump-flow, V-funnel and L-box tests respectively. Further the durability properties are examined for High Strength Self Compacting Concrete mix of grade M100. The durability factors are also studied .From these studies we observe that 15% Micro silica and 25% Fly ash will give optimum strength for M100 grade at water /powder ratio of 0.22. The effect of Na 2 So 4 on these mixes is nil where as HCL and H 2 So 4 had substantial impact.