This standard is issued under the fixed designation C ; the number 1 This test method is under the jurisdiction of ASTM Committee C-9 on Concrete. Purchase your copy of ASTM C – 15 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available. mm. Thickness Measurement by ASTM C Accurate measurement of thickness requires knowledge of the in-place P- wave speed. ASTM C, “Test .
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Measurement of P-wave Speed The figure is an example of the measurement of P-wave speed by using two transducers a known distance apart.
Proceed to Checkout Continue Shopping. By measuring the time interval between the arrival of the direct P -wave at the first transducer and the arrival of the diffracted wave at the second transducer, the depth of the crack can be calculated. Work Item s – proposed revisions of this standard.
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. In impact-echo testing, the P-wave is used to obtain information about the member. Active view current version of standard.
Referenced Documents purchase separately The documents listed below are referenced within the subject d1383 but are not provided as part of the standard. The DOCter is a versatile, portable system based on the impact-echo method, and can be used for the following applications:.
NDT System Add-On — Impact Echo
Thus, the impact-echo method is able to determine the location of internal defects as well as measure the thickness of a solid member.
The peak at The explanation for this 0. Impact-Echo TestThis procedure measures the frequency at which the P-wave generated by a short-duration, point impact is reflected between the parallel opposite surfaces of a plate. Already Subscribed to this document. Contact Olson Instruments when adding on to an existing system, or purchasing multiple systems as some of the components are common to other test methods.
ASTM C1383 – 15
The thickness T of the member is related to this astn frequency asstm and wave speed Cp by this simple approximate equation see below: The upper plot in this example shows the surface displacement waveform obtained from a test of a solid concrete slab. By positioning the cursor at the frequency associated with the flaw, the flaw depth is shown by the Viking software. Detection of Internal Defects The P-wave generated by impact will reflect at interfaces within the concrete where there is a change in acoustic impedancewhich is defined as the product of the density and wave speed of a material.
Need more than one copy? The frequency content covered by the Spider impactors is approximately 1.
Docter | GERMANN
The distance L mm between the transducers, is divided by time difference t between arrival of the P-wave at the second and first transducers.
A sensitive displacement transducer next to the impact point picks up the adtm due to the arrival of the P-wave. The Spider multiple impactor unit can be purchased as an option to increase the operating range of the systems. When the P-wave reaches the back side of the member, it is reflected aastm travels back to the surface where the impact was generated.
The Spider is placed adjacent to the Mark IV transducer as shown in the photo. If the wave speed is determined by the surface measurement method, the resulting value is multiplied by 0. Standards Subsctiption may be the perfect solution.
Please first log in with a verified email before subscribing to alerts. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Impact-Echo Test— This procedure measures the frequency at which the P-wave generated by a short-duration, point impact is reflected between the parallel opposite surfaces of a plate.
A negative reflection coefficient means that the stress changes sign when the stress wave is reflected; for example, a compressive stress would be reflected as a tensile stress. The figure below the waveform is the amplitude spectrum obtained by transforming the waveform into the frequency domain. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
Example The upper plot in this example shows the surface displacement waveform obtained awtm a test of a solid concrete slab.