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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Lastly, the IE method will provide information on the depth of a flaw or defect, in addition to mapping its lateral location and extent. Testing for quality of grout injection in cable ducts located by ground penetrating radar.
Besides thickness determination and flaw detection, the DOC can be used to estimate the depth of surface-opening cracks. By positioning the cursor at the frequency associated with the flaw, the flaw depth is shown by the Viking software.
The P-wave is then reflected back into the member and the cycle begins again. Historical Version s – view previous versions of standard.
P-Wave Speed MeasurementThis 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. When the P-wave reaches the back side of the member, it is reflected and travels back to the surface where the impact was generated.
DOCter Purpose The use of traditional stress wave methods, such as ultrasonic through transmission, to identify the presence of anomalies in structures requires access to both faces of a member.
The P-wave speed is calculated by dividing the distance between the two transducers by the travel time. The same principle applies to reflection from an internal defect delamination or void. A short-duration stress pulse is introduced into the member by mechanical impact. Training may be available at your location by one of our agents upon special arrangement.
Docter | GERMANN
Measurement of P-wave speed by surface method. This is because the wave has to travel a longer distance as it diffracts around the flaw.
Complete Docter Brochure Docter Publications. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. 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.
The displacement waveform is transformed into the frequency domain to produce an amplitude spectrumwhich shows the predominant frequencies in the waveform. Depth of Surface-Opening Cracks The DOCter can also be used to measure the depth of surface-opening cracks, using a time domain analysis. Link to Active This link will always route to the current Active version of the standard.
The DOCter is a versatile, portable system based on the impact-echo method, and can be used for the following applications: Detection of delaminations and honeycomb in sewer pipe.
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. Subscription pricing is determined by: 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.
The thickness T of the member is related to this thickness frequency f and wave speed Cp by this simple approximate equation see below: The following lists the reflection coefficients of a P-wave travelling through concrete and incident normal to an interface with air, water, soil, or steel: 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.
Powered by WordPress Theme Designed by: Please first log in with a verified email before subscribing to alerts. The diffracted P-wave is detected by the transducer on the opposite side of the crack from the impact.
ASTM C Standard
The Spider is placed adjacent to the Mark IV transducer as shown asttm the photo. It is seen that at a concrete-air interface, there is complete reflection of the P-wave. This assumes that the same P-wave speed is applicable at all test points.
Already Subscribed to this document. The Spider multiple impactor unit can be purchased as an option to increase the operating range of the systems. These notes and footnotes excluding those in tables and asgm shall not be considered as requirements of the standard. Standards Subsctiption may be the perfect solution.
The P-wave speed is determined by testing over a solid portion of a plate with known thickness. The Viking software allows the user to place cursors at the points corresponding to the P-wave arrivals, and calculates the value of Cp. 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.
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard.
NDT System Add-On — Impact Echo
Referenced Documents purchase xstm The documents listed below are referenced within the subject standard but are not provided as part of the standard. Cc1383 figure below the waveform is the amplitude spectrum obtained by transforming the waveform into the frequency domain. In impact-echo testing, the P-wave is used to obtain information about the member.
The equation on page 50 is used to solve for Cpi. 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 ashm Estimate early-age strength development with proper correlation Principle A short-duration stress pulse is introduced into the member by mechanical impact.
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. The frequency content covered by the Spider impactors is approximately 1.