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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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: The equation on page 50 is used to solve for Cpi.
NDT System Add-On — Impact Echo
No other units of measurement are included in this standard. Measurement of P-wave speed by surface method. The frequency content covered by the Spider impactors is approximately 1. The upper plot in this example shows the surface displacement waveform obtained from asrm test of a solid concrete slab. The recorded waveform of surface displacement has a periodic pattern that is related to the thickness of the member and the wave speed. There is a certain level of systematic error in the calculated thickness due to the discrete nature of the digital records that are used.
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 OE Website is loaded with Tech Brief and project photos using the equipment shown on this website.
Need more than one copy? Lastly, the IE method will provide information on the depth of a flaw or defect, in addition to mapping its lateral location and extent.
If the document is revised or amended, you will be notified by email. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The thickness is calculated from astj measured frequency and the P-wave speed obtained from Procedure A.
ASTM C Standard
Furthermore, it is not possible to determine the depth to anomalies. Historical Version s – view previous versions of standard.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. 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 P-wave is then reflected back into the member and the cycle begins again. 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.
A short-duration stress pulse is introduced into the member by mechanical impact.
Work Item s – proposed revisions of this standard. The Spider is placed adjacent to the Mark IV transducer as shown in the photo. Alternatively, Cp may be determined by measuring the time for the P-wave to travel between two transducers with a known separation.
When the P-wave reaches the tip of the crack, the crack tip acts as a P-wave source, a process called diffraction. One method is by determining the thickness frequency and then measuring c1338 actual plate thickness at that point. CTG-2 requires Windows Device. This impact generated three zstm of stress waves that propagate away from the impact point.
ASTM C1383 – 15
It c138 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. The system includes a laptop computer, a data acquisition module, one Mark IV transducer with impactors, and software.
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. IE investigations can also be performed to predict the strength of early age concrete if the member thickness is known.
The absolute systematic error depends on the plate thickness, the sampling interval, and the sampling period. As explained in Note 12the minimum lateral dimensions and acceptable sampling period are related. Link to Active This link will always route to the current Active version of the standard. The frequency associated with the portion of the P-wave that travels around the defect will be shifted to a lower frequency value than the solid plate thickness frequency.
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