Applying diffuse ultrasound under dynamic loading to improve closed crack characterization in concrete

Area of Science:

• Materials Science
• Civil Engineering
• Non-Destructive Testing

Background:

• Diffuse ultrasound shows promise for characterizing surface-breaking cracks in concrete.
• Existing methods are sensitive to variations in crack opening, affecting parameter reliability.
• Partially opened zones within cracks present a challenge for accurate assessment.

Purpose of the Study:

• To investigate the impact of controlled crack opening and closing on diffuse ultrasound parameters.
• To explore how low-frequency bending loads can provide additional information about crack morphology.
• To enhance the reliability of diffuse ultrasound for concrete non-destructive evaluation.

Main Methods:

• Applying a low-frequency bending load to concrete samples with surface-breaking cracks.
• Monitoring variations in diffuse ultrasound parameters during the loading cycle.
• Analyzing the relationship between load-induced crack dynamics and ultrasound signal changes.

Main Results:

• Diffuse ultrasound parameters demonstrate sensitivity to crack depth under varying load conditions.
• The method effectively captures supplementary information related to crack morphology.
• Load-induced crack closure and opening significantly influence the measured ultrasound characteristics.

Conclusions:

• Controlled mechanical loading enhances the diagnostic capability of diffuse ultrasound for concrete cracks.
• This approach offers a more robust method for non-destructive evaluation of concrete structures.
• The findings suggest improved characterization of crack morphology, leading to better structural health monitoring.