Downloaded from https://www.everyspec.com MU-STD-620A 13 Jmwory 1463 1. SCOPE 2. ( \’kolne[el’. .\ I :1’~lolili(’1(1 V1.*t’lUllt!lt’1”, 310dt!l LVF. 1.1 This method of testing is used for evaluation of rut) belizcd-tal cement pro- posed for use in the I’nfillUf’iiCIUl’t! of h(~t- mix rubberized-tar pavements, )~itl]~!s at least 4 in. wide and 6 it). hmg. The panels shall be free of any foreign material (dus(, oil, etc.), .stmll not be ~vurped or ben(, and sh:~ll be discared i~ft~y each I1OV:test. 2..3 Metal panel~. Blight tin-coated 2. APPARATUS 2.1 Melting unit. .+ unit, for melting laboratory samples, of the double-boilvr type 2,6 ~lold~.
.4mnlgillnMted br~ss molds G cm long, 4 cm \,lide, and 0.32 cm cive~. employing a high fl~h-~oi]l[ oil as the heat- transfer medium and equi]~ped with: 2.7 Containers. C’ontilillers approximate- ly 2111 in. in diameter and 1 ! I, in. deep (a) A bottom discharge of opening controlled by M knife or biade valve to ~)ermit drawing ON melted material. ( 3-OZ seamless ointment boxes). / 2.8 Balance. Laboratory balance, 2-kg rap~city, sensitive to 0.1 g. L (b) A mechanical agitator installed in each rnaterinl chamber. 2.9 Appurtenant equipmenl. (c) metal thermometers, ditd-type.
capable of measuring tempera- tures as high M 246° F., and graduated ill 52 subdivisions, (a) 1 wire imsket and water bucket suitabie for weighing test speci- mens iu \vater. (d) One t.herrnometer, metal or gIass, 275° F., capacity, subdivisions. (b) 2 spatuias or knives, 1- b~” 6-in. blade, 22 Oven. Tlwrmoatatically controlkd oven capable of maintaining a temperature of 100” ~ 2.0° F. (c) 1 pair of gloves, leather palm or welders, for handling hot equip- ment. . 23 Water bath. A water bath with me- chanical agitator, thermometer, heating ele rnent, and thermostatic controls capable of maintaining a water temperature of & 0.2° F.
(d) 1 pair of gloves, rubber, gauntiet- type, for lifting test specimens from water bath. (e) 1 clip board. Method 107 41