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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ASTM C Standard
The explanation for this 0. Alternatively, Cp may be determined by measuring the time for the P-wave to travel between two transducers with a known separation. 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.
The Viking software allows the user to place cursors at the points corresponding to the P-wave arrivals, and calculates the value of Cp. This standard is not included in any packages. This impact generated three types of stress waves that propagate away from the impact point. Detection of delaminations and honeycomb in sewer pipe.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The limits shall be specified by manufacturer of the apparatus, and the apparatus shall not be used beyond these limits. 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.
Furthermore, it is not possible to determine the depth to anomalies.
Proceed to Checkout Continue Shopping. 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 Zstm 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.
Measurement of P-wave speed by surface method. No other units of measurement are included in this standard. This assumes that the P-wave speed is uniform with depth. By positioning the cursor at the frequency associated with the flaw, the flaw depth is shown by the Viking software.
NDT System Add-On — Impact Echo
The thickness is calculated from this measured frequency and the P-wave speed obtained from Procedure A. A sensitive displacement transducer next to the impact point picks up the disturbance due to the arrival of the P-wave.
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. If test equipment is assembled by the user, thickness limitations shall be established and documented. The figure below the waveform is the amplitude spectrum obtained by transforming the waveform into the frequency domain.
Please first log in with a verified email before subscribing to alerts. The P-wave speed is calculated by dividing the distance between the two transducers by the travel time. When the P-wave reaches the tip of the crack, the crack tip acts as a P-wave source, a process called diffraction.
The frequency content covered by the Spider impactors is approximately 1. These minimum lateral dimensions are necessary to prevent other modes 3 of vibration from interfering with the identification f1383 the thickness mode frequency in the amplitude spectrum.
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.
Training may be available at your location by one of our agents upon astk arrangement. There is a certain level of systematic error in the calculated thickness due to the discrete nature of the digital records that are used.
adtm 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. Link to Active This link will always route to the current Active version of the 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.
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. Link to Active This link will always route to the current Active version of the standard. CTG-2 requires Windows Device. C13383 other units of measurement are included in this standard.
IE investigations can also be performed to predict the strength of early age concrete if the member thickness is known. The use c1338 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.
This is because the wave has to travel a longer distance as it diffracts around the flaw. The DOCter comes in two versions: 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 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 method is based on the assumption that the concrete plate has the same P-wave speed cc1383 its depth. The thickness is calculated from this measured frequency and the P-wave speed obtained from Procedure A.
The recorded waveform of surface displacement has a periodic pattern that is related to the thickness of the member and the wave speed. If the defect is just large enough to aatm detectable, the amplitude asmt will show two peaks: These notes and footnotes asrm those in tables and figures shall not be x1383 as requirements of the standard.
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.