INFLUENCE OF POZZOLANIC ADDITION ON SERVICE LIFE OF CONCRETE

Abstract

The durability has gain utmost important for the serviceability at the reasonable costs. Low durable materials later incur the additional cost for repair and retrofitting. The porous nature of concrete, the vulnerability of steel reinforcement to corrosion and slight incompatibility between the two leads to deterioration of reinforced cement concrete. This deterioration is caused by external and internal factors like aggregates used, water/cement ratio, type of reinforcement and casting methods. The durability performance of nominal strength concrete with incorporation of micro and nano silica has been inspected and key durability parameters has been calculated and the conclusions has been drawn based on the parameters calculated. These parameters have been compared to understand the improved durability performance by pozzolanic addition. The service life of these mixes in atmospheric marine zone has been calculated by using Life 365 model. The service life is affected by different parameters like chloride surface concentration, chloride threshold value, cover, apparent diffusion coefficient. The diffusion coefficient has been obtained from non-steady state migration coefficient by using fib model. The effect of parameters on service has been studied thoroughly.