ASTM C215-02

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation:C215 – 02
Standard Test Method for
Fundamental Transverse, Longitudinal, and
1
Torsional Resonant Frequencies of Concrete Specimens
This standard is issued under the fixed designation C 215; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* C 670 Practice for Preparing Precision and Bias Statements
2
for Test Methods for Construction Materials
1.1 This test method covers measurement of the fundamen-
3
E 1316 Terminology for Nondestructive Examinations
tal transverse, longitudinal, and torsional resonant frequencies
of concrete prisms and cylinders for the purpose of calculating
3. Terminology
dynamic Young’s modulus of elasticity, the dynamic modulus
3.1 Definitions—Refer to Terminology C 125 and the sec-
of rigidity (sometimes designated as “the modulus of elasticity
tion related to ultrasonic examination in Terminology E 1316
in shear”), and dynamic Poisson’s ratio.
for definitions of terms used in this test method.
1.2 Values in SI units are the standard.
1.3 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
4.1 The fundamental resonant frequencies are determined
responsibility of the user of this standard to establish appro-
using one of two alternative procedures: (1) the forced reso-
priate safety and health practices and determine the applica-
nance method or (2) the impact resonance method. Regardless
bility of regulatory limitations prior to use.
of which testing procedure is selected, the same procedure is to
2. Referenced Documents be used for all specimens of an associated series.
4.2 Intheforcedresonancemethod,asupportedspecimenis
2.1 ASTM Standards:
forced to vibrate by an electro-mechanical driving unit. The
C 31/C 31M Practice for Making and Curing Concrete Test
2 specimen response is monitored by a lightweight pickup unit
Specimens in the Field
on the specimen. The driving frequency is varied until the
C 42/C 42M Test Method for Obtaining and Testing Drilled
2 measured specimen response reaches a maximum amplitude.
Cores and Sawed Beams of Concrete
The value of the frequency causing maximum response is the
C 125 Terminology Relating to Concrete and Concrete
2 resonant frequency of the specimen. The fundamental frequen-
Aggregates
cies for the three different modes of vibration are obtained by
C 192/C 192M Practice for Making and Curing Concrete
2 proper location of the driver and the pickup unit.
Test Specimens in the Laboratory
4.3 In the impact resonance method, a supported specimen
C 469 Test Method for Static Modulus Elasticity and Pois-
2 is struck with a small impactor and the specimen response is
son’s Ratio of Concrete in Compression
measured by a lightweight accelerometer on the specimen.The
output of the accelerometer is recorded. The fundamental
frequency of vibration is determined by using digital signal
1
This test method is under the jurisdiction of ASTM Committee C09 on
processing methods or counting zero crossings in the recorded
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
waveform. The fundamental frequencies for the three different
C09.64 on Nondestructive and In-Place Testing.
Current edition approved Dec. 10, 2002. Published February 2003. Originally
e1
approved in 1947. Last previous edition approved in 1997 as C 215 – 97 .
2 3
Annual Book of ASTM Standards, Vol 04.02. Annual Book of ASTM Standards, Vol 03.03.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C215–02
modes of vibration are obtained by proper location of the the frequency range and, in combination with the driving unit,
impact point and the accelerometer. shall be free from spurious resonances that will be indicated in
the output.
5. Significance and Use
NOTE 1—It is recommended that the calibration of the variable fre-
5.1 This test method is intended primarily for detecting
quency audio oscillator be checked periodically against signals transmit-
significant changes in the dynamic modulus of elasticity of ted by the National Institute of Standards and Technology radio station
WWV, or against suitable electronic equip
...