Service Life Estimation of Reinforced Cement Concrete Structure Induced By Chloride Ions

M. MADHUBABU, Mr. D. Aditya Sairam

Abstract


Concrete is the most versatile and unique material for building industry. The service life of the concrete sometimes reduced due to deterioration caused by the various environmental factors. The rate of deterioration may have very high when the steel used in concrete starts corroding. The Corrosion induced deterioration in reinforced cement concrete structure is a common and recurring problem in the world. A durable concrete can provides an excellent service to maintain its expected strength and service life. In the past several decades, the research approach had been limited to the strength of concrete, but due to the emerged harsh environment, in recent years, research has been focused towards the durability and long-term performance of concrete structures.

This study aims to formulate a method to determine the service life estimation of Reinforced Cement Concrete (RCC) structures based on the experimental data generated by conducting various durability tests using different grades of concrete with and without mineral and chemical admixtures.

The scope of the work involves studying the durability properties such as chloride diffusion, Rapid Chloride Penetration Test (RCPT), Water Permeability, Resistivity and Accelerated corrosion test for different grades of concretes with and without mineral admixtures to formulate a relationship among the durability parameters for estimating the service life of reinforced concrete. This study also covers the effect of concrete cover thickness, concrete surface coatings, corrosion resistance steel and corrosion inhibitors on durability. Durability properties have been studied for concrete grades varying from M25 to M75 with mineral admixtures such ash fly ash and Ground Granulated Blast Furnace Slag (GGBS) in comparison with control concretes of similar grades.

Corrosion Inhibitors such as Calcium Nitrate, Sodium Nitrite and Monoethanolammine were used by adding 1 to 4 % by mass of cement in M40 grade concrete and the effect on durability on concretes were studied. Accelerated corrosion initiation time study was carried out on concrete specimens and the effect of concrete cover thickness also conducted using different size cylindrical moulds and re-bars to give a clear cover thickness of 29.5 mm, 40 mm, 46 mm, 59 mm, and 70 mm. From the results of durability study, the constitutional relationship among RCPT, Chloride Diffusion, Water Permeability, Resistivity and Accelerated Corrosion Initiation Time has been formulated. From this co-relation, an equation has been obtained which helps to estimate the service life of reinforced cement concrete structures made with materials of similar to what has been used in the study. Based on this experimental results and co-relationship between durability properties, a model has been developed using MATLAB program to estimate the service life of reinforced concrete structure. The model has been validated with the experimental results carryout on concretes especially for validation and found very good.


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