Downloaded from https://www.everyspec.com MJlAl&620A 13 Jwwary 1?65 tion by immersing ill the waler bath for not less than 20 minutes. Thoroughly ~]Cfill the guide rods and the inside surf~ces of the test hwd~, and lubrimte the guide rods *O 1hftt thr Ilpprl” test hCRd slides freely over them. time for the test from remowd of test sp(’ci- men from the water bath to the rnits imum load determination shall not exceed 30 wc- ond~. Correcl the load for variations from the standard 21, ~-in. length by udng the proper multiplying factor from table I. 5. Calculations and Report. 5.1 A summary of computations, such as that shown in figure 100-10, shall hc pre- pared.
Asphalt ,“,....................,,, .,,.,,.., .............................. 140 * 1 Tar . ... ........ ..................... .. ........ ...... . .. . ... ........ 100*1 ~ubberizcd tat . . . . ............. ................ 120 * 1 ‘rtmll: 1. .~/nlPilif.y-P*IrIelti!itInI rnlio Adjust the flowmeter to zero. Remove the specimen from the water bath, and place it in the lower segment of the breaking head. (The testing head temperatu~e shall be maintained between 70 and 100” F., using a water bnth when necessary.) Place the \ upper segment of the breaking he:lci cm the specimen, and place the complete assembly in position on the testing machine (figs.
100-1 and 100-6, respectivciy, show the Marshall test apparatus and the Universal testing machine using the Marshall break- ing head ) . When using the Marshal] ap- paratus, place the adjusted flowmeter in position over one of the wide rods, and hold the sleeve firmly against the upper seg- ment of breaking head while load is applied. When using the Universal machine, an ex- tensometer is normally used. WQ.4men In cubic Volumc 1 d Approximate thkkn- of Cwrrlmti,,u cent imet G -n nwlmsn in Ineti .
.- - rn(in 200-213 1 5.66 214-225 1-1/16 6.00 226-237 1-1/8 4.56 238-260 1.3/~6 4.17 g51-264 1-1/4 3.86 265-276 1-5/16 3.5’7 277-289 1-3‘8 3.3:; 290-S01 1-7/16 3.03 302-S16 1-1/2 2.78 1 2.50 317-s28 1-6/’8 1-9/16 2.27 Apply load to the specimen at constant rate of movement of 2 in. per minute until the maximum load is reached and the load begins to decrease. Record the maximum load. Remove the llowmeter from iti posi- tion o\ler the guide rod the instant the max- imum load begins to decrease. Note and record the indicated flow value, Elapaed 320-s40 341-s68 1-11/16 2.08 3s4-a67 1-3/4 1.92 968479 1 1-1s/18 1,79 3s0-s92 I 1-7/’8 1.87 Method 100 7 .--x