SHRP-A-379 traducir

4.4 Erlenmeyer Flasks (500 mL)--wide-mouthed, with #10 neoprene stoppers.
4.5 Erlenmeyer Flask (lO00 mL).
4.6 Volumetric Flasks (25 mL)--Class A.
4.7 Funnel--75 nun in diameter.
4.8 Filter Paper--125 mm in diameter. 1
4.9 Ring Stand and Clamps--stand and clamps should be sufficiently large to hold
the funnels without danger of tipping over.
4.10 Graduated Cylinder--glass, 250 mL capacity.
4.11 Micropipettor--capable of being set to any volume from 1 to 10 mL and
equipped with disposable tips.2
4.12 Magnetic Stirrer and Stir Bar--small magnetic stirrer and appropriately sized
stir bar capable of stirring asphalt binder in toluene solution.
4.13 Analytical Balance--capacity of 500 g and sensitivity of + 0.001 g.
4.14 Aggregate Drying Oven--capable of maintaining 135°C + 1.3°C.
5. REAGENTS
5.1 Toluene--UV or spectroanalyzed grade.
5.2 Water--distilled or deionized water. Commercially available bottled water is
acceptable.
6. AGGREGATE PREPARATION
6.1 Weigh a 50 + 0.3 g sample (weighed to the nearest 0.001 g) of the minus 4.75
mm aggregate stockpile and dry, uncovered, in a 135°C oven for a minimum of 15 hours.
6.2 Remove the sample from the oven at least 15 minutes prior to adding to the
Erlenmeyer flask and store in a desiccator until needed. Samples not used within 24 hours of
lWhatman No. 42 (VWR 28480-106) has been found to be satisfactory.
2Eppendorf Maxipettor (VWR 53512-930) has been found to be satisfactory.
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