There are three specific purposes for testing asphalt emulsions. They are as follows:
Two primary sources exist for finding specifications and test procedures for asphalt emulsions. The American Society For Testing and Materials (ASTM) and The American Association of State Highway and Transportation Officials (AASHTO) are generally the most widely accepted sources for determining specifications and test procedures. However, within many state highway organizations additional specification and test procedures may exist.
The particle charge test is used to identify the charge associated with a particular asphalt emulsion. Immersing a positive electrode and a negative electrode into an emulsion sample performs the test. The electrodes are then connected to a controlled direct-current electrical source. At the end of the test period, the electrodes are observed. If there is an appreciable layer of asphalt determined on the negative electrode then the emulsion is cationic.
Viscosity is defined as a fluid's resistance to flow. For asphalt emulsions the Saybol Furol viscosity test is used as a measure of viscosity. Depending on the type of emulsion, one of two testing temperatures are used, 25oC and 50oC (77oF and 122oF).
Yes, the field coating test and water resistance test are used to determine the ability of the asphalt emulsion to coat the job aggregate, the ability of the emulsion to withstand mixing, and the ability to resist the washing action of water after the completion of mixing. This test is primarily used to identify medium-setting asphalt emulsions suitable for mixing with coarse-graded aggregates.
A distillation is performed under controlled conditions to extract the light oil, and water from a sample of asphalt emulsion. What is leftover is the asphalt residue from the asphalt emulsion. This residue is expressed as a percentage by weight of the total sample. Additional tests may be run on the residue to determine the physical properties of the end-use asphalt.
There are many different types of tests that can be performed on asphalt emulsion residue. They measure the ductility, solubility, hardness, elasticity, and resistance to flow at elevated temperatures. AASHTO and ASTM have developed several tests to determine these properties.
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Asphalt Emulsion Manufacturers Association