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8.2.3 Sections 8.3 and 8.4 present specific separation tests for type I and type II<br />
polymer modified asphalt binders. Actual limits should be reported when sufficient data<br />
exists to support such criteria. A separation test for one type of material, however, may not<br />
provide appropriate data for other types. Consult modifier producers to determine appropriate<br />
separation tests and test limits for their particular materials.<br />
NOTE8.--These separation tests and the nomenclature are adapted from the Guide Specifications For<br />
Polymer Modified Asphalt.<br />
8.3 Separation Test for Type I Polymer Modified asphalt binder<br />
8.3.1 Evaluate a type I polymer modifier from asphalt cement during hot storage by<br />
comparing the dynamic shear stiffness of the top and bottom samples taken from a<br />
conditioned, sealed tube of polymer-modified asphalt binder. Condition the modifier by<br />
placing a sealed aluminum tube of polymer-modified asphalt binder in a vertical position in a<br />
165°C oven for 48 hours.<br />
8.3.2 Place the empty aluminum tube with its sealed end down in the rack. Carefully<br />
heat the sample until sufficiently fluid to pour. Avoid localized overheating. Strain the fluid<br />
sample through a 0.300-mm sieve conforming to M92. After thorough stirring, pour 50.0 g<br />
into the vertically held tube. Fold the excess tube over two times, crimp, and seal.<br />
NOTE9.--Aluminum tubes 25.4 mm in diameter by 139.7 mm long may be obtained from Sheffield<br />
Industries, P.O. Box 351, New London, CT 06320. Incidents have been reported regarding leakage of asphalt from<br />
the bottom of these tubes during the conditioning period. Other tubes may be required if this leakage is significant.<br />
8.3.3 Place the rack containing the sealed tubes in a 163 + 5°C oven. Allow the<br />
tubes to stand undisturbed in the oven for a period of 48 + 1 hour. At the end of the heating<br />
period, remove the rack from the oven and immediately place in the freezer at -5 + 5°C,<br />
taking care to keep the tubes in a vertical position at all times. Leave the tubes in the freezer<br />
for a minimum of 4 hours to completely solidify the sample.<br />
8.3.4 Upon removing the tube from the freezer, place the tube on a flat surface. Cut<br />
the tube into three equal length portions with appropriate tools. Place each section of tube<br />
into a separate 100 mL beaker in a 163 + 5°C oven until the modified binder is sufficiently<br />
fluid to remove the pieces of aluminum tube.<br />
8.3.5 After a thorough stirring, prepare specimens from the top and bottom samples<br />
for testing by TP5 (dynamic shear rheometer). Record and compare the shear stiffness of the<br />
top and bottom portions of the sample. Duplicate separation tests should be run. Test results<br />
shall be within 5 %.<br />
NOTE 10.--Other<br />
physical and chemical residue tests may be run at this time, if desired.<br />
8.4 Separation Test for Type H Modifiers<br />
8.4.1 This test is a simple qualitative test for compatibility of low-density polymers<br />
in asphalt.<br />
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