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A Study to Improve the Reliability of High-Strength Concrete Strength Evaluation Using an Ultrasonic Velocity Method
1Department of Fire and Disaster Prevention, Semyung University, Jecheon 27136, Republic of Korea.
Materials (Basel, Switzerland)
|October 28, 2023
Summary
Ultrasonic pulse velocity (UPV) concrete testing is influenced by temperature and aggregates. New models considering these factors improve compressive strength prediction accuracy, crucial for concrete quality evaluation.
Area of Science:
- Materials Science
- Civil Engineering
- Non-destructive Testing
Background:
- Ultrasonic pulse velocity (UPV) is vital for concrete quality assessment.
- Existing UPV compressive strength models lack analysis of factors causing model discrepancies.
Purpose of the Study:
- Investigate UPV prediction model differences based on age vs. temperature.
- Statistically analyze the impact of aggregates and water/cement ratio on UPV models.
Main Methods:
- Compared age-dependent and temperature-dependent UPV models for concrete compressive strength.
- Performed statistical analysis on factors like temperature, aggregate density, and water/cement ratio.
- Analyzed microstructural differences between age- and temperature-based models.
Main Results:
- High temperature exposure showed residual strength 9.5-24.8% higher than age-dependent strength, while UPV decreased by 34.5%.
- Compressive strength and UPV showed significant variations with temperature, aggregate density, and design strength.
- Regression-based UPV model achieved high accuracy (R²=0.91) compared to models ignoring these factors.
Conclusions:
- Temperature, aggregate density, and design strength significantly influence UPV-based compressive strength predictions.
- Temperature-dependent UPV models offer improved accuracy for concrete quality evaluation.
- Microstructural analysis provides further insight into UPV model variations.
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