**PERFORMING THE
SIEVE TEST**

**ON EMULSIFIED
ASPHALTS**

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This IM is intended to provide the procedure for determining the amount of asphalt particles larger than the No. 20 (850 μm) mesh sieve in emulsified asphalt.

· Sieve, having a 8 in. (200 mm) diameter frame with No. 20 (850 μm) mesh sieve cloth

· Pan of appropriate size to fit over the bottom of the sieve

· Balance, with at least 1000-gram capacity and accurate to 0.1 gram

·
Distilled water (deionized or
potable water __may__ be used for Procedure B, but potable water may result
in erroneous results.

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__PROCEDURE__

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1. Weigh the sieve and pan to the nearest 0.1 gram.

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2. Weigh 1000 grams of emulsion into a suitable container, such as a large beaker.

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3. Wet the sieve with distilled water.

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4. Pour the 1000 grams of emulsion through the sieve.

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5. Wash the container, which held the sample and residue on the sieve with distilled water until the washings run clear.

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6. Place the pan under the sieve and heat for 2 hours at a temperature of about 275°F (135°C) in a drying oven.

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7. Cool the sieve and pan to room temperature and weigh to the nearest 0.1 gram.

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**B.
For Field Use**

If the slightest amount of residue is detected as retained on the sieve, a sample representing this emulsion must be obtained and an official test, according to Procedure A, performed.

1. Weigh the sieve and pan to the nearest 0.1 gram.

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2. Weigh 1 quart (950 ml) of emulsion into a suitable container, such a large beaker.

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3. Wet the sieve with water.

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4. Pour the 1 quart (950 ml) of emulsion through the sieve.

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5. Wash the container, which held the sample and residue on the sieve with water until the washings run clear.

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6. Visually examine the sieve for residue retained. If no residue is visible, the emulsion is considered to comply with the sieve test requirement.

__CALCULATION__

1. Calculate the percent of sample retained on the sieve as follows:

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Where: A = Weight of sieve and pan, g

B = Weight of sieve, pan and residue, g

C = Weight of sample from A2, g

__DOCUMENTATION__

1. The test result is reported to the nearest 0.01%.