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The paper presents the results regarding the identification of the value of the pull-off adhesion between a concrete added layer with a constant thickness and a substrate concrete layer in existing elements. A method of identification, which is based solely on the use of artificial neural networks (ANNs) and two non-destructive acoustic methods: impact-echo and impulse response on the surface of the added layer, was developed. The methodology of identifying the pull-off adhesion between a concrete added layer and a substrate layer in existing elements was developed and presented in the paper and is useful in construction practice. [ABSTRACT FROM AUTHOR]

The article focus on the effect of the porosity within the interfacial zone on pull-off adhesion using X-ray micro computed tomography. The study shows that grinding of the concrete substrate causes a decrease of the thickness of the interfacial zone. However, shotblasting does not cause such decrease. It was shown that the fraction and the number of pores in the material within the interfacial zone between layers is different in three divided zones. Moreover, the relation between the fraction and the number of pores in the three zones and the pull-off adhesion f b between the layers was also shown. [ABSTRACT FROM AUTHOR]