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Concrete cover quality of in-situ and precast concrete structures

Durability performance assessment – a case study


The durability of reinforced concrete (RC) structures is dependent on the resistance of the concrete cover to ingress of aggressive substan- ces from the environment that initiate and sustain the corrosion process. The concrete cover’s resistance is dependent on its thickness and penetrability. In South Africa, the performance-based approach developed and implemented is through the use of Durability Index (DI) tests that provide a measure of penetrability. In addition, cover depth measurements are made to verify for compliance with limit values. The main focus of the paper is a comparison of the oxygen permeability index (OPI) and cover depth values from in-situ and precast structural ele- ments to evaluate the degree of control exercised in construction. It is observed that both the average values for OPI and cover depth of pre- cast and in-situ structural elements complied with the limit value provided in the specifications. However, precast elements had a lower variability in measured values indicating that a higher level of control is exercised.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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