Lab 4 CON310 - Soils Aggregates(Compaction ARIZ 217...

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Soils & Aggregates (Compaction) ARIZ 217 – Moisture Content by Moisture Calcium Carbide Method Purpose: The purpose of this construction materials test procedure (ARIZ 217) is to determine the moisture content of soils by means of a calcium carbide gas pressure moisture tester. The ability to make fast moisture content determinations is critical to a successful compaction control process. By performing fast moisture content determinations, the quality control technician can provide real-time information to the contractor to allow adjustments to the compaction process to be completed. Introduction: The test generally involves placing fine soil in a calcium carbide moisture tester. When the fine soil reacts with the calcium carbide inside the calcium carbide moisture tester pressure develops. The dial on the calcium carbide moisture tester is then read to determine what the moisture content of the soils is. As an alternate, a camping stove and a scale can be used in the field to determine the moisture content. Definition(s): Calcium Carbide Pressure Moisture Tester = A chamber with attached pressure gauge for the water content of specimens having a mass at least 20 grams. To be effective the tester must be calibrated and used in accordance with the manufactures instructions. Calcium Carbide Reagent = A finely pulverized material that reacts with water. The reagent must be capable of producing acetylene gas in the amount of at least 0.14 m^3/kg (2.25 ft^3/lb) of carbide. Equipment: Calcium carbide moisture tester - 1 Calcium carbide reagent – 24 grams No. 4 sieve - 1 Steel balls - 2 Soil to be tested - 1 Procedures: 1. Screen the soil and/or soil aggregate mixture to be tested over a no. 4 sieve or screen. This screening can be performed easily on the job site. 2. Place three scoops (approximately 24 grams) of calcium carbide within the calcium carbide moisture tester. The steel balls are placed in the moisture tester to create the necessary crushing and blending action of the soil and calcium carbide within the moisture tester. 3. Place the appropriate amount of soil in the cap at the end of the calcium carbide moisture tester. 4. While holding the body of the calcium carbide moisture tester in a horizontal
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position insert the cap of the tester. Make sure that no calcium carbide comes into contact with the soil until a complete seal is achieved. 5. Raise the calcium carbide moisture tester to a vertical position and shake vigorously for at least 60 seconds and up to 180 seconds for other types. 6. When the needle on the gauge stops moving read the dial while holding the instrument in a horizontal position at eye level. Record the sample mass and dial reading. 7. With the cap of the instrument pointed away from the operator, slowly release the gas pressure, empty the pressure vessel and examine the material to ensure that the soil was completely pulverized.
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