Characterising Penetrometer Tip Contact during Concrete Condition Assessment

Area of Science:

• Materials Science
• Civil Engineering
• Geotechnical Engineering

Background:

• Accurate concrete condition assessment is crucial for infrastructure integrity.
• Penetrometers are used to evaluate concrete hardness, but tip slippage can cause errors.
• Distinguishing between sound and corroded concrete requires reliable contact.

Purpose of the Study:

• To investigate the influence of penetrometer tip shape on slippage during concrete condition assessment.
• To identify optimal tip geometries for enhanced contact and reduced slippage.
• To improve the reliability of penetrometer-based concrete evaluation.

Main Methods:

• Designed and modeled a range of superellipse-parameterized cylindrical penetrometer tips.
• Performed finite element analysis (FEA) on the parametric models.
• Machined stainless steel penetrometer tips based on FEA results.
• Tested tip performance on concrete surfaces at various angles.

Main Results:

• Tip shape significantly affects slippage during concrete penetrometer testing.
• The squircle-shaped tip exhibited the minimum slippage across tested angles.
• This suggests a geometric solution to improve penetrometer performance.

Conclusions:

• The squircle tip design offers superior performance for concrete condition assessment penetrometers.
• Optimized tip geometry can mitigate slippage and enhance assessment accuracy.
• Further research could explore other shapes and materials for improved concrete evaluation tools.