ASTM D4944 PDF

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.

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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? That reads out on the basis of wet original weight, not dry sample weight, requiring a correcting chart.

However, the device worked fine and I do not recall any calibration problems as one has with nuke methods. This then permitted some rapid testing, not causing any delays for the contractor as with a no good test zone already buried when an answer comes from the lab.

It works fine in sands and sandy clays; however, you have to be careful that cohesive materials are broken up in the test process to get an accurate moisture content. You should also "calibrate" it against oven dried moisture on the same material. Develop a calibration curve that is material specific. Another caution Given that, it is a good and convenient method to use in the field. If a nuke is not available you can go old school with a sand cone and oven moisture content or cheaper microwave moisture content ASTM.

I also have seen a vendor try and promote electrical density meters which would not be subject to nuclear restrictions. Not commenting on precision? I also think there are limitations on clay - not sure to what extent? If you are making a method spec and the borrow is coming from the site, you should already know the water content of the formation. If using a test fill, then that test fill program could include some one-points for comparison to the lab proctor and some better water contents.

Heck, even a frying pan, triple beam and Coleman stove would be another way to contrast Speedy to water content for your clay?

In the end, you should have a pretty good idea of performance. Question asks your experience with this device.

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ASTM D4944 - 18

Document Center Inc. 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.

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ASTM D4944 PDF

Product Details 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.

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Calcium carbide, used as a reagent, reacts with water as it is mixed with the soil by shaking and aetm with the aid of steel balls in the apparatus. Results are sometimes needed within a short time period and in locations where it is not asgm to install an oven or to transport samples to an oven. 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 d and mixed. Active view current version of standard. For specific hazards statements, see Section 7.

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Fenrishakar The inch-pound units given in parentheses are mathematical conversions, which are provided for information purposes only and are not considered standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the sstm of regulatory limitations prior to use. Test Method D is to be used as the test method to compare for accuracy checks and correction. A measurement is made of the gas pressure produced xstm a specified mass of wet or moist soil is placed in a testing device with an appropriate volume of reagent and mixed. Active view current version of standard.

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