Work Item
ASTM WK82351
New Test Method for Test Method for Non-Contact Measurement of Resonances of Concrete Cylinders
1. Scope
The proposed test method standard will establish best practices for measurement of transverse or longitudinal resonant modes of a concrete cylinder based on the sound of an impulsive stimulus. Attachment of sensors to the cylinder is not required. Strike locations and support conditions are prescribed that will repeatably produce an acoustic impact response which contains a dominant resonant mode. While the underlying principles of operation of the proposed test method are similar to what is described in ASTM C215, there are substantial differences. A non-mandatory appendix also describes approaches to estimating compressive strength based on measured resonances. While there are usage scenarios where such strength estimators are useful, they shall not be used as the sole basis for acceptance based on specified strength unless such use is permitted in building codes and regulations.
Keywords
NDT; non-destructive testing; concrete compressive strength; Impulse Excitation; Modal Analysis; Impact Response; acoustic resonance; cylinder
Rationale
For testing of cylinders, this test method serves a similar purpose as the test method described in C215 with the added advantage that attachment of sensors to the cylinder is not required. A simple impactor is sufficient, and common cellphones or other such computing devices have ample capability to support performance of the test in real time. As such, this test method is suitable for use in regions where there is little infrastructure for testing. The measured resonances can be used to estimate elastic modulus as described in C215 and E1876. Also, the measured resonances can used as inputs to a strength estimator. Such a strength estimator is useful for corroborating compression test results, informing the selection of cylinders, scheduling of compression testing, and facilitating efficient measurement of strength development through repeated testing of individual cylinders.
The title and scope are in draft form and are under development within this ASTM Committee.
Work Item Status
Date Initiated: 06-21-2022
Technical Contact: Neil Cox
Item: 000
Ballot:
Status: