Road American
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How is SAMI-grade bitumen emulsion formulated for stress-absorbing membrane interlayer applications?
SAMI emulsions are designed to form a flexible, stress absorbing layer between pavement courses, so formulation emphasizes elasticity, cohesion, and resistance to cracking and moisture damage. This typically means polymer or latex modification, controlled residue properties, and a breaking profile that allows uniform chip or aggregate embedment without flushing. Viscosity must support spray and hold stone without runoff. The emulsion must also be compatible with the aggregate and any geotextile or interlayer system used. Qualification usually includes elastic recovery, adhesion or stripping tests, and field trials under the expected traffic and temperature regime.
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