Downloaded from https://www.everyspec.com MILST’D420A 1S Jowory 1965 Method low IW’I’IU{MININ(; l)E(;RtW OF S’l’i/ll}l’JN(; OF A(;(;RF;(; A’1’J?S L SCOPE 3.1 Mix a test sample consis~ing of the aggregate and a8phalt to be used in the paving mixture at the applicable tempera- ture for the grade of asphalt being used. Then spread the sample in a loose, thin lager and air-cure for 24 hours before testing. 1.1 met,hod of Lwt.ing is intended for determining the degree of stripping of asphalt-coated aggregates, 1.2 Striping is defined as lose of asphalt coating from the aggregate particles be- cau8e of displacement by the action of water, leaving exposed aggregate surfaces, 4. TEST PROCEDURE 2.
APPARATUS 4.1 Place a representative portion of the sample, not larger than onehalf the ca- pacity of the jar, in the glass jar and com- pletely cover with distilled water. Close the jar with a tigh~ screwcap and allow to stand for 24 hours. At the end of 24 hours, shake the jar containing the sample vigor- ously for 16 minutes. Then examine the ,wrnple of the mixture for stri ppinK. 2J Mixing apparatus. A metal pan or bowl and a trowel for hand mixing. (Mechanical mixing is permi88ib]e.) 22 Ovens or hotplatea. Ovens or hob plates for heating aggregates m-d bitumi- nous material to the applic.~ble mixing Iomperaturc for Ihc yradr ti~ph~lf mu+. i REPORT 3.
PRF;PARATION OF SAMPl,iJ Method 108 49