The wood elastic constants are of great importance in the design of structural elements. In particular, the elastic modulusin the longitudinal direction is often used for strength estimation and grading of wood. Ultrasonic techniques arecommonly applied to determine elastic parameters in laboratory experiments and for condition assessment of existingwooden structures. In the present study, the elastic parameters (elastic modulus and shear modulus) for aged and un-agedMexican pine (Pinus strobus) wood were measured by the ultrasonic emission-transmission technique. The experimentalmeasurements were carried out using longitudinal and shear ultrasonic transducers with a central frequency of 1 MHzand 0.5 MHz respectively. Ultrasonic data and scanning electron microscopy (SEM) were performed, establishing adirect correlation with the measurements of the longitudinal and shear ultrasonic velocities and the elastic propertiesdeveloped on the naturally aged and un-aged wood. Finally, the elastic and shear modulus of the wood before and afteraging conditions were determinate. Therefore, the obtained experimental results not only contribute to the existingknowledge about aged wood but provide useful information about the possibilities of re-using wood as well.
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