Determining Demulsibility of Emulsified Asphalt: Standard Test Method For
Determining Demulsibility of Emulsified Asphalt: Standard Test Method For
Determining Demulsibility of Emulsified Asphalt: Standard Test Method For
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D 6936 – 04
5.8 Balance, capable of weighing 500 6 0.1 g. weigh. Repeat the heating and weighing until successive
5.9 Oven, capable of maintaining a temperature of 163 6 weights differ by no more than 0.1 g.
3°C
7. Calculation
6. Procedure 7.1 Subtract the tare weight of the beaker, rod, and wire
cloth from the weight of the dried assembly to obtain the
6.1 Determine the percentage of residue as described in Test
demulsibility residue. Calculate the demulsibility as follows:
Method D 6997 or Test Method D 6934.
6.2 Record the weight of the assembly of beaker, rod, and Demulsibility, % 5 ~A/B! 3 100 (1)
wire cloth. where:
6.3 Weigh 100 6 0.1 g of the emulsified asphalt into the A = weight of demulsibility residue from the test of the
600-mL beaker in the weighed assembly. Bring the weighed sample of emulsified asphalt, and
sample of emulsion and the proper reagent to a temperature of B = weight of residue in 100 g of the emulsified asphalt.
25 6 1.0°C.
6.4 Over a period of approximately 2 min, add to the beaker, 8. Precision and Bias
from a buret, one of the following: 8.1 The following criteria should be used for judging the
6.4.1 35 mL of CaCl2 0.02 N solution (1.11 g/L) (5.5) for acceptability of results of tests on RS emulsified asphalt (95 %
anionic rapid setting emulsified asphalts, or probability):
6.4.2 50 mL of 0.10 N CaCl2 solution (5.55 g/L) (5.6) for 8.1.1 Duplicate results by the same operator should not be
anionic medium setting, or mixing-type, emulsified asphalts, or considered suspect unless they differ by more than the follow-
6.4.3 35 mL of dioctyl sodium sulfosuccinate solution ing amount:
(0.80 %) (5.7) for cationic rapid setting emulsified asphalts. Demulsibility, weight % Repeatability, % of the mean
6.5 While adding the solution (6.4.1, 6.4.2, or 6.4.3), stir the 30 to 100 5
contents of the beaker continuously and vigorously, kneading 8.1.2 The results submitted by each of two laboratories
any lumps against the sides of the beaker to ensure thorough should not be considered suspect unless they differ by more
mixing of the reagent with the emulsified asphalt. than the following amount:
6.6 Continue kneading any lumps for an additional 2 min Demulsibility, weight % Reproducibility, % of the mean
after all the solution has been added. 30 to 100 30
6.7 Decant the mixture of any unbroken emulsified asphalt 8.2 Precision does not apply when using dioctyl sodium
and reagent onto the wire cloth. Rinse the beaker containing sulfosuccinate solution in the testing of cationic emulsified
the sample and metal rod with distilled water, pouring the rinse asphalt for demulsibility.
water through the wire cloth. Knead and break up all lumps, 8.3 The bias of this test cannot be determined because no
and continue washing the beaker, rod, and wire cloth until the material having an accepted reference value is available.
rinse water drains clear.
6.8 Place the wire cloth enclosing the asphalt residue in the 9. Keywords
beaker with the metal rod. Place the assembly in a 163 6 3°C 9.1 asphalt emulsion; cationic emulsified asphalt; demulsi-
drying oven for 1 h. Allow the beaker and contents to cool and bility; emulsified asphalt; emulsion
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Copyright by ASTM Int'l (all rights reserved); Tue Aug 14 18:36:55 EDT 2007
Downloaded/printed by
Rosita Martnez (SemMaterials Mxico) pursuant to License Agreement. No further reproductions authorized.