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Assessment of the bond strength in compositemembers

Combining precast and in-situ concrete


The roughness of the substrate surface plays an important role in the behaviour of multi-layer reinforced concrete members. Methods like sand-blasting, hydrodemolition and raking are usually adopted to increase it before placing the new concrete layer. Afterwards, a visual inspection is usually conducted to verify if an adequate roughness degree is achieved. However, this type of assessment is highly subjective and therefore it can lead to inaccurate conclusions. Since no standard method exists to verify the roughness of the substrate surface, current concrete design codes implicitly propose a qualitative assessment. To overcome the drawbacks of this current practice, the authors developed a method and measuring device that can be used in situ to more accurately predict the bond strength of concrete-to-concrete interfaces.

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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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