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r Cotilornia Test 301 1978 Litre 6:"Li',ater added—ntl."includes tilt'Milliliters e gisis;dc nt thickness to its intercept with tine Curreet Of water added for "soaking" plus the final tivater traffic indc-x .,;:lee. Vtorn this point project a vertical added during the mixing oper:atian just prior to corn- line to read the R•valuc. paclian !fart 1). Line %`:"Wnter added--percent" is calculated ill D. CONTROL the manner indicated in the:method for calculating 1. Refer to California 'fest 102 for detail:on the the densities of 11-value test speri•nens (fart VI), rnochanics of the Stabilometer including its oprra- Lhie S.•"Moisture at compaction—percent"is the tion,calibration and the installation of the Neoprene stun of the percent initial moisture and the perevill [diaphragm. razoisture added' z. The currrct Volumetric adjustment of the ;air Lb2osO.,md 10.-The height of briquette (to nearest cell in the la}•drraulic chamber of the stabilometer is 0-M inch) and the wet weight of briquette (granas) neeesstry in order to establish standardized horizon- arc determined prior to the exp:uasion pressure test. tal pressure and displacement readings.The Follow- These Values are used with the moisture at compac- ing is an outline of this calibration procedure: lion in the density computations (part I11). a. Adjust bronze nut on stabilometer stage base so Lire I I: "P,cnsity—pounds per cubic foot"is cal- that the top of the stage is 314 inches below the culatcd in accordance with the method ofcalculating bottom of the upper tapered ring. Perform till the densitcs of 11-slate test specimens (Part N'1), tests at this setting. LfiI to 14inclusia•e: The stabilometer data are b, Adjust tlae testing machine so that the base entered as they are determined during the perform• plate moves upward at a rat_of 0.05 inches per ance of the stabilometer test. minute when unloaded.This adjustment is per- Line 15.The exudation pressure is recorded as the formed with the stabilometer and stage base on compressive stress in psi at which moisture is exuded the platen. The hydraulic testing machines from the specimen as indicated by the exudation must be run several minutes before the oil pressure device (Part I11). Nvarms up sufficiently to maintain a constant Litre 16.-"Stab.Thick-Feet"is calculated in accord- speed. -nice with the method of calculating design thickness c. Put the standard metal specimen in place in the of pavements, (Part V!II). This calculation is only stabilometer.Seat it firmly on the stage and by required when expansive soil has been tested, holding it in place with either the hand or a Luno 17.•In the space provided for expansion pres- confining load of 100 pounds in the testing ma. sure, the deflection measurement of the calibrated chine, turn the pump to a pressure of exactly a bar in the expansion pressure device multiplied bL psi,Adjust the turns indicator dial to zero.Turn 10,000 is entered,and it is called the"dial reading." the pump handle at an approximate rate of two Referring to the example given on the work- card turns per second until the stabilometer dial included in Part V11 of this test method (Figorc 18), reads 100 psi.The turns indicator dial shall read dial readings of 91 and 18 correspond to deflection 2.00 ± ,05 turns.If it does not,the air in the cell measurements of.0041 and .0015 inches,respective- roust be adjusted. Remove or add air by means 1? of the salve and the rubber bulb,and repeat the Line 1&To obtain expansion pressure thickness in displacement measurement after each air feet,divide the expansion pressure on line 18 by 30, change until the proper number of turns is ob- Nci'rr:Line 19. Use the structural design chart in tained. Release horizontal pressure and remove figure 20 to determine the R-value by expansion. the standard metal specimen.The stabilometer T Project a horizontal line from the required gravel is now ready for testing specimens. 13