Non-Deterministic Assessment of Surface Roughness as Bond Strength Parameters between Concrete Layers Cast at...

Area of Science:

• Civil Engineering
• Materials Science
• Geotechnical Engineering

Background:

• Surface roughness is critical in structural rehabilitation.
• Existing methods for assessing concrete-to-concrete strength are often subjective or qualitative.
• Non-destructive examination of surface roughness is essential for reliable structural assessments.

Purpose of the Study:

• To develop an innovative, objective procedure for estimating concrete-to-concrete strength.
• To overcome the limitations of existing qualitative and subjective assessment methods.
• To accurately estimate interface strength factors like cohesion and friction.

Main Methods:

• Utilizing low-cost, area-limited tests combined with geostatistical methods.
• Acquiring surface texture data via terrestrial close-range photogrammetry to create digital surface models.
• Generating sequential Gaussian random fields based on semivariograms fitted to digital surface models to reproduce surface texture randomness.

Main Results:

• Accurate estimation of interface strength factors (cohesion and friction) from surface texture data.
• Transformation of roughness parameters (mean valley depth, semivariogram sill) into contact bond strength parameters.
• Successful application of geostatistical methods to numerical surface models for interface bond strength estimation.

Conclusions:

• The proposed procedure offers an accurate and objective alternative for assessing concrete-to-concrete bond strength.
• The method effectively utilizes surface roughness parameters and geostatistical analysis.
• This approach has significant potential for both practical structural rehabilitation and theoretical applications.