ASTM D4944 PDF

The spec only allows for CL and CH materials. So we specify equipment, weight, pressure and number of passes. It is being recommended that we use the above referenced ASTM and associated equipment to performe field moisture testing to ensure some level of proper moisture control. Any experience with these testing methods out there? Types of fills?

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More D Results are sometimes needed within a short time period and in locations where it is not practical to install an oven or to transport samples to an oven. This test method is used for these occasions. Inaccuracies may result because specimens are too small to properly represent the total soil, from clumps of soil not breaking up to expose all the available water to the reagent and from other inherent procedural, equipment or process inaccuracies.

Therefore, other methods may be more appropriate when highly accurate results are required, or when the use of test results is sensitive to minor variations in the values obtained. Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Scope 1. A measurement is made of the gas pressure produced when a specified mass of wet or moist soil is placed in a testing device with an appropriate volume of reagent and mixed.

Test Method D is to be used as the test method to compare for accuracy checks and correction. Calcium carbide, used as a reagent, reacts with water as it is mixed with the soil by shaking and agitating with the aid of steel balls in the apparatus. To produce accurate results, the reagent must react with all the water which is not chemically hydrated with soil minerals or compounds in the soil. Some highly plastic clay soils or other soils not friable enough to break up may not produce representative results because some of the water may be trapped inside soil clods or clumps which cannot come in contact with the reagent.

There may be some soils containing certain compounds or chemicals that will react unpredictably with the reagent and give erroneous results.

Any such problem will become evident as calibration or check tests with Test Method D are made. Some soils containing compounds or minerals that dehydrate with heat such as gypsum which are to have special temperature control with Test Method D may not be affected dehydrated in this test method. The inch-pound units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard. In addition they are representative of the significant digits that generally should be retained.

It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazards statements, see Section 7. DOI:

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ASTM D4944 - 18

More D Results are sometimes needed within a short time period and in locations where it is not practical to install an oven or to transport samples to an oven. This test method is used for these occasions. Inaccuracies may result because specimens are too small to properly represent the total soil, from clumps of soil not breaking up to expose all the available water to the reagent and from other inherent procedural, equipment or process inaccuracies. Therefore, other methods may be more appropriate when highly accurate results are required, or when the use of test results is sensitive to minor variations in the values obtained.

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ASTM D4944 PDF

A measurement is made of the gas pressure produced when a specified mass of wet or moist soil is placed in a testing device with an appropriate volume of reagent and mixed. Test Method D is to be used as the test method to compare for accuracy checks and correction. Calcium carbide, used as a reagent, reacts with water as it is mixed with the soil by shaking and agitating with the aid of steel balls in the apparatus. To produce accurate results, the reagent must react with all the water which is not chemically hydrated with soil minerals or compounds in the soil. Some highly plastic clay soils or other soils not friable enough to break up may not produce representative results because some of the water may be trapped inside soil clods or clumps which cannot come in contact with the reagent.

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