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Quality control of prefabricated elements using electrical resistivity

Performance assessment and specifications


Current codes and standards use a prescriptive-based approach for the durability design of concrete, whereby requirements for compres- sive strength, cement content and water/cement ratio are prescribed based on the exposure class and life span of the structure. Additionally, for reinforcement corrosion, codes and standards also specify maximum flexural crack widths. Of late however there has been a shift from prescriptive-based durability design approach to that of performance–based approach. The latter approach requires the durability control- ling parameter(s) to be identified along with corresponding test(s) and an appropriate service life prediction model to determine the service life of the structure. This article describes the use of electrical resistivity of concrete as a durability performance parameter, as well as the additional information that the resistivity provides, such as the setting period, the mechanical strength and the degree of curing. A brief method on how to design a concrete mix for a target resistivity is also provided.

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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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