We are not aware of any recognized standard for abrasion testing or acceptance specifically for this application. ASTM International has several abrasion tests for concrete and mortar that include:
ASTM C418-05, "Standard Test Method for Abrasion Resistance of Concrete by Sandblasting";
ASTM C779/C779M-05(2010), "Standard Test Method for Abrasion Resistance of Horizontal Concrete Surfaces";
ASTM C944/C944M-99(2005)e1, "Standard Test Method for Abrasion Resistance of Concrete or Mortar Surfaces by the Rotating-Cutter Method"; and
ASTM C1138M-05(2010)e1, "Standard Test Method for Abrasion Resistance of Concrete (Underwater Method)."
Also, ACI 350-06, "Code Requirements for Environmental Concrete Structures," Section 4.6, has requirements for protection against erosion.