APID CHLORIDE PERMEABILITY TEST FOR DURABILITY STUDIES ON HIGH STRENGTH CONCRETE USING MICRO Al2O3

Abstract

Concrete is the backbone for all construction and development activities entire the world. Concrete as a construction material are classified into normal concrete or high strength concrete based on its compressive strength. Generally construction industry needs faster development of strength in concrete as well as better performance characteristics like durability, shrinkage, creep and so on. Among all the characteristics chloride penetration which comes under durability property leads more damage to the
structure as it consists of reinforcing bars. Rapid chloride permeability test is conducted to the concrete specimens to know the chloride penetration. High strength concrete is a concrete mixture, which possesses a high durability and high
strength when compared to conventional concrete. The use of some mineral and chemical admixtures like micro aluminium oxide, silica fume and Super plasticizer enhance the strength, durability and workability qualities to a very high extent. A mineral admixture introduces favourable behaviour with respect to shrinkage and high development of heat of hydration and enhances durability. Low water/cement ratio is a crucial aspect which can be achieved by using chemical admixtures such as superplasticizer. The present study is carried out on M60 grade of plain cement concrete with different percentages of micro Al2O3 by weight of cement. In the present experimental investigation cylinders of 100mm x 150mm of M60 grade concrete were cast with varying percentage of micro Al2O3 of 0%, 0.5%,1% and 1.5%. The rapid chloride permeability tests were conducted for a period of 28, 60 and 90 days.