STATE OF OHIO
DEPARTMENT OF TRANSPORTATION
SUPPLEMENT 1013
METHODS OF TESTING ASPHALT EMULSIONS
April 18, 2008
1013.01 Introduction. The following Methods of Testing Asphalt Emulsions are issued in accordance
with 702.04. Tests are to be conducted in accordance with the latest AASHTO Standards unless specified
otherwise.
1013.02
Testing.
1. Sieve Test, AASHTO T-59. Replace the Sodium Oleate Solution (2%) with distilled water for
RS-C, MS-C and MSC-3.
2. Residue by Distillation, AASHTO T-59. Express the oil portion of the distillate as a percentage of
volume of the total emulsion.
3. Particle Charge Test. This test is conducted using an electro-plating process using D.C. electricity,
having a potential adequate to give a reading of 8-10 milliamperes at the beginning of the test. Connect
two stainless steel plates 1" x 3" (25.4 x 76.2 mm) in size, properly identified as to positive
and negative, separated by an insulating device capable of holding the plates parallel one half inch
apart, to the positive and negative terminals of the D.C. current. Immerse the plates to a depth
of 1 inch (25.4 mm) in the emulsion sample, the current connected and adjusted to a flow of 8 to
10 milliamperes. When the current has dropped to 2 milliamperes, or at the end of 30
minutes, whichever occurs first, disconnect the current, and remove the plates from the
sample and gently wash with distilled water. An appreciable deposit of asphalt on the
negative plate (cathode) with a relatively clean, asphalt-free positive plate indicates a
cationic emulsion. An appreciable deposit of asphalt on the positive plate (anode), with a
relatively clean asphalt-free negative plate indicates an anionic emulsion.
4. Coating Test.
a Aggregates. Use aggregates to test the emulsions from sources standardized by the
Laboratory. Meet the following grading requirements:
Passing a 3/8"(9.5 mm) sieve
Passing a 1/4"(6.3 mm) sieve
100%
0%
Wash the standard reference aggregates with distilled water until free from dust and
dry.
For anionic emulsions use a standard reference aggregate of crushed calcareous
limestone. For cationic emulsions the standard reference aggregate use silica gravel.
b
With Dry Aggregate. Weigh exactly 93 grams of the dry graded aggregate sample into a
suitable container. Weigh exactly 7 grams of emulsion into a suitable container. Weigh
exactly 7 grams of emulsion on to the aggregate in the container and contents mixed
vigorously for two minutes. Set the mixture aside to cure in the container for thirty minutes
at room temperature. After curing, drench the mixture in the container with cold tap water until
the overflow water runs clear. Drain the excess water off, the mixture dumped on absorbent
paper and estimate the percent of total aggregate surface area coated by visual
inspection.
c
With Wet Aggregate. Conduct this test in the same manner as the test with dry aggregate
except when exactly 93 grams of the dry graded aggregate have been weighed into the
container, add 2% distilled water by weight to the aggregate and thoroughly mix before
the emulsion is added. Then continue the test as described with a dry aggregate.