Downloaded from https://www.everyspec.com w#-stD420A 18 Jaatmty 1965 (1) scoop, 2-quart siz{!, for h:lndiin’i hot aggregates. 2.16 Appurtenant G quipment. (a) Containers for heating aggregtites, such m flat-bottom metal pans, or other suitable containers. (m) Scoop, fiat bottom, for lJlaci nx mixture In specimen molds. (b) Containers for heating bituminous material, such as metal cups, beakers, or pouring pots. 3. PREP.\RATION OF SPECIMENS 3.1 Preparation of aggregati DrT aggregate to constant weight at 110” C. plus or minus C. (221° to 2S9” F.), and separate the aggregates by sieving into the desired sieve fractions.
The f 0110 w i n g separation are recommended for paving mixes having ~lj-in. maximum size aggre- gate: ~~- to a/8-in., $!-in. to No. 10, No- 10 to No. 40, finer than No. 40, and mineral filler. Ag~%gate separation may be accomplished in a large, proceeding-type sieve shaker, a standard mechanical sieve shaker, or a rocker-type hand shaker. Sieve analysis of each separated portion is required to calculate the perwrmtage of each size range to use in the requ{~ mix. (c) Mixing tool, either steel trowel (gamien type) or spatula, for spading and handmixing. (d) Thermometers f o r determining temperatures of aggregates, bi- tumen, and bituminous mixtures.
Armorecl glass thermometers or dial-type with metal stem are recommended. They must have a range of F. to 400” F., with a sensitivity of SO”F. (e) Thermometers for \vater bath with a range of 100” F. to 140° F. and graduated to 0,6” F. 2.2 Preparation of mixturee. Weigh in- L- Balance, 2-kg capacity, sensitive to 0.1 g, fol’ weighing molded specimens. to indi\*idual pans the amount of each size fraction required to produce a batch that wiIl result in either one or two compacted specimens, each 2 I\: inches ~ ~ in. in height. This will require approximately 1400 g of blended aggregate per specimen. Figure 100-7 illustrates the form recom- mended for recording these laboratory batch weights.
Place plate or in the oven, peratures indicated in tion, (f) (%) Balance, 20-& capacity, sensitive to 1.0 g, for preparing bitumen and aggregate mixtures. Wire basket and water bucket suitabie for weighing molded specimens in water. the pans on the hot- and heat to the tem- the following tabula- (h) (i) Gloves for handling hot equipment. Typ Mttnwn H48i18#t000p0mt9?0, Rubber gloves for removing speci- mens from inter bath. Ape ~ (j) Acphelt eaaont —m*s S70*S (k) Marking crayons for identifying ~imen8, Tar, RT-10, -11, or -U _ 225i6 S00=5 Rubberieod tar MO*6 866*6 Method 1(MI .... 5