New contributions to granite characterization by ultrasonic testing.

Area of Science:

• Geophysics
• Materials Science

Background:

• Ornamental stone producers require rapid, economical methods for evaluating stone properties.
• Environmental sustainability, durability, and safety are key demands in the ornamental stone industry.

Purpose of the Study:

• To analyze and develop the utility of ultrasound testing for estimating physico-mechanical properties of granite.
• To explore novel ultrasound parameters beyond pulse velocity for material characterization.

Main Methods:

• Experimental study on 30 cm cubic granite specimens using longitudinal and shear wave transducers.
• Extraction of Fast Fourier Transform (FFTs) and attenuation parameters from ultrasound data, extending frequency range to 500 kHz.
• Validation of laboratory data with methodological improvements.

Main Results:

• Established linear statistical correlations between new ultrasound parameters (FFTs, attenuation) and granite physico-mechanical properties.
• Identified correlations with salt crystallization resistance and breaking load for anchors.
• Demonstrated the effectiveness of novel ultrasound parameters in material assessment.

Conclusions:

• Ultrasound testing, incorporating FFTs and attenuation analysis, is a suitable nondestructive method for evaluating granite durability and safety.
• These findings support the broader application of ultrasonics in the ornamental stone industry.
• The study consolidates ultrasonics as a valuable tool for quality control and material selection in granite applications.