Downloaded from https://www.everyspec.com , M Januy ma aert the sheet-metal stirrer, and allow psil and contents to cool to 72* * 2° F. 43 Remove aggregati and asphalt from oven, and add aggregate gradually to the hot aaphalt while stirring tbortmghly. Con- tinue tb stir uniformly G fter all a~te - is added until the total elapsed time from start of mixing to end of stirring is 2 minutee. Cool to 72° & 2* F. Flame tmr- face during the cooling period to remove air bubbles if such are p-k IVda.
A niitlimm of 6 hours b U8Ud~ ~Qhd to accomplish tbh, and p?dWd)& @ and ~ are allowed to cool ow8rdgW 43 Weigh pail plus aephalt and stirrer in air at room ternpereturv and in water at A 2° F, 4.4 Place the pail of aaphalt witL etirlwr and aleo the sample of aggregate in an oven maintained at a temperature of 280° A 6° F., and leave both until temperatures are equaliaed (a minimum of 4 hours ie usually required) . sol?. It is preforabk to cool ~wnight. 5. CALCULATIONS AND REPORT 5.1 Calculate the bulk-impregnat~ speci- fic gmvi~ as follows:
A Bulk-impregnated specific gravity s ~E ~ _ (B c-j where A = weight of oven-dried aggregate, g B = weight of pail plus stirrer plus asphalt in air, g c = weight of pail plus stirrer plus :isphalt in water, g L D = weight of pail plus stirrer plus :isphalt nggregete in air, g E = t’.”~ightof psi] p]us stirt’w” plus asph8]t plus aggregate ill water, g 5.2 The results are tabuhtted and reported within 0.04. If the values are within the on a form such as that shown in figure 0.04 tolerance, use the average value. If 106-1. the duplicate tests do not produce values within the 0,04 to]erance, perfom two addi- 6. REPRODUCIBILITY OF RESULTS tional duplicate tests.
If the average value of the second two tests is not within the 6.1 Duplicati determinations of tho bulk- tolermce, then average the values deter- impregnatal specific grnvity must check mined in G l! four tests and use this value. Method 105 36