ASTM D4644 PDF

More D A primary example is the Franklin Rating System 1. Agencies that meet the criteria of Practice D are generally considered capable of competent and objective testing, sampling, inspection, and so forth. Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Scope 1.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. The values given in parentheses are provided for information only. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. Terminology 3. A primary example is the Franklin Rating System 1.

Apparatus 5. It shall be cylindrical in shape, with a diameter of mm 5. Current edition approved Feb. Published April It must be sufficiently strong to retain its shape during use, but neither the exterior of the mesh nor the interior of the drum shall be obstructed by a support.

A trough shall support the drum in a horizontal manner such that the drum is free to rotate about its axis. Devices conforming to these requirements are commercially available. These fragments may be naturally occurring or may be produced by breaking with a hammer.

Such fragments may be obtained from rock cores or from test pits, and their sizes will vary with the method of sampling. Break off any sharp corners, if possible, and remove any dust by brushing the sample just prior to weighing.

The total sample shall weigh to g. Procedure 7. Weigh, and dry in the oven for 16 h or to constant mass. Allow the shale and drum to cool at room temperature for 20 min and weigh again. D FIG. Fill the trough with distilled water at room temperature to 20 mm 0. Rotate the drum at 20 rpm for a period of 10 min. Record the water temperature at the beginning and end of the run. Repeat 7. Type III—Retained material is exclusively small frag- ments.

See Fig.

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