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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If the defect is just large enough to be detectable, the amplitude spectrum will show two peaks: Standards Subsctiption may be the perfect solution.
ASTM C1383 – 15
A negative reflection coefficient means that the stress changes sign when the stress wave is reflected; for example, a compressive stress would be reflected as a tensile stress. The Spider multiple impactor unit can be purchased as an option to increase the operating range of the systems. Alternatively, Cp may be determined by measuring the time for the P-wave to travel between two transducers with a known separation.
This impact generated three types of stress waves that propagate away from the impact point. Thus, the impact-echo method is able to determine the location aatm internal defects as well as measure the thickness of a solid member.
No other units of measurement are included in this standard. 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. This is because the wave has to travel a longer distance as it diffracts around the flaw.
Docter | GERMANN
The system includes a laptop computer, a data acquisition module, one Mark IV transducer with impactors, and software. The DOCter comes in two versions: These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. The Viking software allows the user to place cursors at the points corresponding to the P-wave arrivals, and calculates the value of Cp.
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. In impact-echo testing, the P-wave is used to obtain information about the member. By measuring the time interval between the arrival of asgm 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. DOCter Purpose The use of traditional stress wave methods, such as ultrasonic through transmission, to identify the presence 1c383 anomalies in structures requires access to both faces of a member.
Already Subscribed to this document. Lastly, d1383 IE method will provide information on the depth of a flaw or defect, in addition to mapping its lateral location and extent. This standard is not included in any packages. 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.
ASTM C Standard
Your Alert Profile lists the documents that will be monitored. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of qstm limitations prior to use.
Work Item s – proposed revisions of this standard. The P-wave speed is calculated by dividing the distance between the two transducers by the travel time. Need more than one copy?
Accurate measurement of thickness requires knowledge of the in-place P-wave speed. The DOCter is a versatile, portable system based on the impact-echo method, and can be used for the following applications:. Sorry, this content is unavailable because your browser does not support iframes.
A sensitive displacement transducer next to the impact point picks up the disturbance due to the arrival of the P-wave. If the area of the reflecting interface is large, the impact-echo response will be similar to that of a solid plate except that the thickness frequency will be shifted to the higher value corresponding to the depth of the interface.
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.
Subscription pricing is determined by: Thus the correct equation for thickness calculation is: This makes the impact-echo method inherently powerful for detecting air interfaces, such as those due to delaminations, cavities, and honeycombed concrete. Measurement of P-wave speed by surface method.