AASHTO M 140:2018 Standard Specification for Emulsified Asphalt.
Note 3—When emulsified asphalts (in particular, rapid-setting grades) are held in containers at ambient temperature for an extended period, emulsified asphalt droplets can coalesce, leading to unrepresentative changes in emulsified asphalt liquid properties. Coalescence can also lead to sieve development and, ultimately, destabilization of the emulsified asphalt. This can be noted as overall inhomogeneity of the sample even after careful reheating and mixing upon receipt.
3.1.2. If the sample was subjected to freeze—thaw cycling prior to receipt, discard and resample for testing. If the emulsified asphalt was frozen at any time before testing, results for emulsified asphalt liquid properties such as viscosity, sieve, and settlement will be invalid.
Note 4—Emulsified asphalt residue properties can also be affected when the liquid emulsified asphalt to be recovered shows signs of inhomogeneity or has been subjected to freeze—thaw cycling.
Note 5—If the emulsified asphalt appears inhomogeneous or is suspected of’ having been subjected to freeze—thaw cycling prior to testing and a second, representative sample cannot be obtained, actual emulsified asphalt performance at time of construction should be reviewed. If sample integrity issues persist, consider deploying R 77 so that liquid emulsified asphalt samples are taken directly f’rom heated storage tanks and are evaluated soon after cooling directly to the required test temperature.
3.2. Emulsified asphalt shall conform to the requirements in Table 1 for the type and grade specified.
4.1. Take samples of emulsified asphalt in accordance with R 66.
4.2. Store samples in clean, airtight, sealed plastic containers at a temperature of not less than 4°C (39°F) until tested.
5. METHODS OF TEST
5.1. Determine the properties of the emulsified asphalts given in Table I in accordance with T 59. Determine the emulsified asphalt viscosity as given in Table 1 in accordance with the Rotational Paddle method in T 382 or by the Saybolt Furol method in T 59, as appropriate. Determine the properties of the emulsified asphalt residue in accordance with T 49, T 50. T 51, or T 111, as appropn ate.
6.1. Emulsified asphalt; medium setting: rapid setting; slow setting.AASHTO M 140 pdf download.