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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Work Item s – proposed revisions of this 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. P-Wave Speed Measurement— This procedure measures the time it takes for the P-wave generated by a short-duration, point impact to travel between two transducers positioned a known distance apart along the surface of a structure.
Proceed to Checkout Continue Shopping. We have no amendments or corrections for this standard. Measure the thickness of pavements, asphalt overlays, slabs-on-ground and walls Detect the presence and depth of voids and honeycombing Detect voids below slabs-on-ground Evaluate the quality of grout injection in post-tensioning cable ducts Integrity of a membrane below an asphalt overlay protecting structural concrete Delamination surveys of bridge decks, piers, cooling towers and chimneystacks Detect debonding of overlays and patches Detect ASR damage and freezing-and-thawing damage Measure the depth of surface-opening cracks Estimate early-age strength development with proper correlation Principle A short-duration stress pulse is introduced into the member by mechanical impact.
No other units of measurement are included in this standard. Lastly, the IE method will provide information on the depth of a flaw or defect, in addition to mapping its lateral location and extent.
NDT System Add-On — Impact Echo
It is the responsibility of the user of this standard asfm establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. As explained in Note 12the minimum lateral dimensions v1383 acceptable sampling period are related. 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.
Alternatively, Cp may be determined by measuring the time for the P-wave to travel between two transducers with a known separation. With the LONGSHIP two-transducer assembly, the transducers are placed mm apart and the impactor is about mm from one of the transducers one the line passing through the transducers.
The system includes a laptop computer, a data acquisition module, one Mark IV transducer with impactors, and software. Active view current version of standard. The figure below the waveform aastm the amplitude spectrum obtained by transforming the waveform into the frequency domain.
As the voice of the U. The Spider multiple impactor unit can be purchased as an option to increase the operating range of the systems. 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.
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. The impact-echo method is based on monitoring the periodic arrival of reflected stress waves and is able to obtain information on the depth of the internal reflecting interface or the thickness of a solid member.
Docter | GERMANN
Furthermore, it is not possible to determine the depth to anomalies. The OE Website is loaded with Tech Brief and project photos using the equipment shown on this website.
The explanation for this 0. Cracks Delaminations Honeycomb Thickness Voids. The LONGSHIP transducers are placed on opposite sides of the crack as shown in the sketch to the right and impact c3183 generated on the line passing through the transducers.
Example The upper plot in this example shows the surface displacement waveform obtained from a test of a solid concrete slab. Olson offers Impact Echo systems for use with v1383 different platforms as shown in the chart below. This assumes that the same P-wave speed is applicable at all test points. Impact Echo IE investigations are performed to assess the condition or thickness of slabs, beams, columns, walls, pavements, runways, tunnels, and dams.
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard.
This standard is not included in astn packages. Sorry, this content is unavailable because your browser does not support iframes. You may delete a document from asym Alert Profile at any time. The peak at Link to Active This link will always route to the current Active version of the standard.
Standards Subsctiption may be the perfect solution. When the P-wave reaches the back side of the member, it is reflected and travels back to axtm surface where the impact was generated. The time of arrival of the P-wave at each transducer is determined as the point when the signal for each transducer rises above the background value. The frequency shift is a good indicator of the presence of a flaw if it is known that the plate thickness is constant.
Need more than one copy? Detection of delaminations and honeycomb in sewer pipe. The thickness is calculated from this measured frequency and the P-wave speed obtained from Procedure A. These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. Click here for Agents. The DOCter is a versatile, portable system based on the impact-echo method, and can be used for the following applications: Already Subscribed to this document.
The P-wave speed is calculated by dividing the distance between the two transducers by the travel time. The x1383 associated with the c13383 of the P-wave that travels around the defect will be shifted to a lower frequency value than the solid plate thickness frequency. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of xstm limitations prior to use.