AASHTO T 217:14(2018) Standard Method of Test for Determination of Moisture in Soils by Means of a Calcium Carbide Gas Pressure Moisture Tester.
This test method is intended to determine the moisture content of soils by means of a calcium carbide gas pressure moisture tester. The manufacturer’s instructions shall be followed for the proper use of the equipment.
The following applies to all specified limits in this standard: For the purposes of determining conformance with these specifications, an observed value or a calculated value shall be rounded off bto the nearest unit” in the last right-hand place of figures used in expressing the limiting value, in accordance with ASTM E29.
Note 1—This method shall not be used on granular materials having particles large enough to affect the accuracy of the test—in general any appreciable amount retained on a 4.75-mm sieve. The super 200 D tester is intended to be used to test aggregate.
The values stated in SI units are to be regarded as the standard.
Retr to OSHA referenced documents for regulatory information for chemicals.
AA SHTO Standards:
• M 231. Weighing Devices Used in the Testing of Materials
• T 265, Laboratory Determination of Moisture Content of Soils
2.2. ASTM Standard:
• E29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.3. Federal Standard:
• Fed. Std. No. 29, CFR 1910.1200, OSHA Hazard Communication Standard; see also Permissible Exposure Limits—Annotated Tables, available at
When using the 20- or 26-g tester, place three scoops (approximately 24 g) of calcium carbide in the cap of the moisture tester. When using the super 200 D tester to test aggregate, place six scoops (approximately 48 g) of calcium carbide in the cap of the moisture tester.
Note 4 —Care must be exercised to prevent the calcium carbide from coming into direct contact with water.
5.2. Weigh a sample of the exact mass specified by the manufacturer using the balance included with the instrument, and place the sample in the body of the tester and the calcium carbide reagent in the cap. Alternatively, the reagent may be placed in the body and the sample in the cap to facilitate cleanup after the test. When using the 20- or 26-g-sized tester, place two 31.75-mm (1.25-in.) steel balls in the body of the tester with the sample.AASHTO T 217 pdf download.