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California Trot 301 1973 42- 32�HOLES Correct positioll. 4. If the tosting machine fills a spllrric;l►ly sccjtv(l 6000 type of upper head,Ilse the proper shims to lock it 00 in such a manner that IIIc colitact face is fixed firmly O O in a horizontal plane. O0 O S. Place follo%R'er ram on top of sample and force 0 sample dawn iu the mold to the contact plate using Q O either hand pressure or the testing machine. OO &. Apply an increasing load at the rate of 2,000 Pounds per minute until wotcr is exuded from the �3 Q specilnrll. Exudation has occurred when one of the 0 '� O � following conditions is nlet: 0 0 a, Water contacts five of the six contact points in 0 � � the contact plate. Contact of mater with the contact points is indicated by lighting of the Q / Q bulbs in the indicator device. Q 0 b. Nater contacts at least three u"the six contact Q O points and free water is squeezed from under 0 the edge of the mold.The presence of free wa- Q ter may be determined visually or by the con- 00000 on- OOOOQ O tact ring which lights another bulb on some indicator device. 7. Measure specimen height with an expansion PERFORATED DISK pressure device and a dial indicator.Adjust the de. PHOSPHOR BRONZE 28 GAUGE vice as described in Part IV-D-3 and 4 until the dial indicator reads zero, Measurement can be made by FIGURE 8 turning up the turntable until the specimen is snug B. MATERIALS in the device and the dial indicator reads 0.0010 inch. Filter paper, smooth type, 4-inch diameter BKli The height can then be read directly from the meas- qualitative,catalog No.28310,or equivalent. uring device and turntable. Record height reading, S. Discard the specimen if the exudation pressure C. CONTROL is found to be less than 100 or more than 800 psi,with The testing machine shall be operated in such a the exception that very expansive material may re- manner that the load will ha applied at the rate of quire an exudation pressure of less than 100 psi. 2,000 pounds per minute. 9. Determine the gross weight of the specimen for density calculations.Tare weight of the mold is de- D. TEST PROCEDURE termined prior to the performance of this test 1. Place Phosphor bronze disc directly on tainped method.If necessary,make weight adjustments(Fig- surface of specimen in mold,and place a single piece tire 1) such that subsequent specimens will conform of filter paper on the disc. to the desired specimen height of 2.5 inches. 2. Invert mold with sample so that the filter paper 10. Leave the test specimen in a covered mold for is on the bottom and place mold on the contact plate at least one-half hour after determination of the exu- of the moisture exudation indicator,making sure that dation pressure before beginning Part IV of this test -it is centered Crmly against both spring posts.In the method. case of a basket sample, do not invert thcr sample prior to placing on contact plate;simply put a filter paper on the bronze disc and put the mold on the E. PRECAUTIONS contact plate. 1. The batteries in the moisture exudation indicat- 3. Place contact plate with sample molal vii platen ing device rrrrrst be replaced tier}-11iree nionths to of testing machine, centering assembly to insure insure efficient operation. even loading,Turn on the moisture exudation indica. 2. When the exudation contact plate becomes tar switch,and the Center indicator light will then be worn or grooved and the contact points become lit provided that the mold is both ctcalr and in the raised-or..depressed,.the-plate-should-.be-replaced.------------------ t 11