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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There is a certain level of systematic error in the calculated thickness due to the discrete nature of the asgm records that are used. The absolute systematic error depends on the plate thickness, the sampling interval, and the sampling period.
Docter | GERMANN
These minimum lateral dimensions are necessary to prevent other modes 3 of vibration from interfering with the identification of the thickness mode frequency in the amplitude spectrum. As explained in Note 12the minimum lateral dimensions and acceptable sampling period are related.
The limits shall be specified by manufacturer of the apparatus, and the apparatus shall not be used beyond these limits. If test equipment is assembled by the user, thickness limitations shall be c133 and documented.
NDT System Add-On — Impact Echo
The method is based on the assumption that the concrete plate has the same P-wave speed throughout its depth. If these conditions are not satisfied, the waveform will be of low amplitude and the amplitude spectrum will not include a dominant peak at the frequency corresponding to the thickness Eq 2.
If the interface between the concrete and subgrade is rough, the amplitude spectrum will have a rounded peak instead of a sharp peak associated with a flat surface. P-Wave Speed Measurement— This procedure measures the time it takes for the P-wave generated by a short-duration, qstm impact to travel between two transducers positioned asmt known distance apart along the surface of a structure.
The P-wave speed is calculated by dividing the distance between the two transducers by the travel time. 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.
The thickness is calculated from this measured frequency and the P-wave speed obtained from Procedure A. No other units of measurement are included in this standard. These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard.
ASTM C Standard
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. Referenced Documents purchase separately Aatm documents listed below are referenced within the subject standard but are not provided as part of the standard.
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