A surface engineering approach applicable to concrete repair engineering

Abstract

Abstract. The objective of the paper is to analyze the effect of substrate roughness and superficial microcraking upon adhesion of repair systems using concrete surface engineering approach. The results presented in this paper have been obtained within the framework of research projects performed to develop a better understanding of the factors affecting the adhesion of repair materials through a surface engineering approach. Based on the results of investigations, the authors showed that the durability and quality of concrete repairs depend to a large degree on the characteristics of the substrate. Mechanical preparation and profiling of the concrete surface to be repaired has to be balanced with potential co-lateral effects such as superficial cracking, too often induced as a result of inappropriate concrete removal method selection, and the loss of benefits due to better mechanical anchorage. The results obtained confirm also that Concrete Surface Engineering, as a scientific concept, will definitely contribute to shed more light on how to optimize repair bond, taking into account interactions between the materials at different observation scales.

On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

“…It has been widely demonstrated that it can significantly influence on the microcracking level and surface roughness, substrate saturation level and as a consequence it may affect the bond strength between repair material and concrete substrate [3,[13][14][15][16][17][18]. The effect of surface quality on impact-echo signal was investigated for two groups of concrete substrates ( Table 1).…”

Non-destructive identification of pull-off adhesion between concrete layers

“…As presented in [28][29][30][31][32], the tests providing the basis for the methodology were carried out on two 2500 × 2500 mm model concrete Table 1 Synthetic description of 3D laser scanning method [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Schematic and view of test setup Recorded parameters 1 2 3 The 3D laser scanning method exploits laser triangulation.…”

“…The methodology uses parameters estimated on the concrete substrate layer surface by the latest 3D laser scanning method [37][38][39][40][41][42][43][44][45][46][47][48][49][50] and parameters estimated on the floor surface by the impulse response and impact-echo methods [51][52][53][54][55][56][57][58][59] and ANN.…”

Non-destructive and semi-destructive diagnostics of concrete structures in assessment of their durability

“…Microscopy --Geodesy -----CCTV ---Impulse response ----Impact echo ---Parallel seismic ---Ultrasonic --Ultrasonic tomography ---Acoustic emission ----Radiographic techniques ---Computer tomography ---Electromagnetic induction -----Radar techniques ---Laser static techniques -----Laser dynamic techniques -----Sclerometric static techniques ----Sclerometric dynamic techniques ----Thermographic passive techniques ----Thermographic active techniques ----Static proof loads -----Dynamic proof In recent years rapid advances in non-destructive 3D optical methods have been made. Using such methods one can obtain a 3D image of the surface of concrete [6][7][8][9][10]. Analysing the image by means of dedicated computer programs one can generate, e.g., the values of 3D roughness parameters in accordance with ISO 25178 [11].…”