The Study of Rapid Chloride Penetration Test on Durability Properties of High Performance Concrete Containing Rice Husk Ash

Abstract

Our aim is to develop concrete which does not only concern on the strength of concrete but it also satisfies the durability aspect. So for this we need to go for the addition of pozzolanic materials along with super plasticizer with having low water cement ratio. The use of Rice Husk Ash is many, which is having good pozzolanic activity and is a good material for the production high performance concrete. The rapid chloride-ion test also reveals that the connectivity of the pore system decreases drastically as the w/c ratio decreases, making the migration of aggressive ions or gas more difficult in HPC than in its plain counterpart. This indicates that the service life of HPC should exceed that of ordinary concrete in the same environment. It is difficult to determine the number of years by which the service life would be extended because the predictive models developed for ordinary concrete cannot be readily extrapolated to include HPC. However, it can be said that some HPC structures will outlast the average life span of a human being. Durability and strength are two essential factors that define performance of concrete. Chloride induced corrosion is considered to be one of the main causes of deterioration in concrete structures. It is caused by the penetration of chloride ions into concrete eventually reaching the steel reinforcement. Chloride permeation is a complex phenomenon involving various transmission mechanisms: such as diffusion of chloride ions and movement of chlorides through permeation of water into concrete. It is found that in the case of saturated concrete, at normal pressure, the predominant transport process is likely to be molecular or ionic diffusion measuring concrete durability related to chloride induced corrosion is more difficult and complicated than measuring compressive strength.