Rate of Application. The Micro-Surfacing mixture shall be of the proper consistency at all times, so as to provide the application rate required by the surface condition. The average single application rate, as measured by the Project Manager, shall be in accordance with the following table: AGGREGATE TYPE LOCATION SUGGESTED APPLICATION RATE TYPE II Urban and Residential Streets 10 – 20 lb/yd² (5.4 – 10.8 kg/m²) TYPE II Primary and Interstate Routes Wheel Ruts 15 – 30 lb/yd² (8.1 – 16.3 kg/m²) As Required Suggested application rates are based upon the weight of dry aggregate in the mixture. Application rates are affected by the unit weight of the aggregate. Micro-Surfacing is often put down in two full-width passes in place of rut-filling when the rutting or deformation is not severe. When two passes are used, the first pass (scratch course) is made using a metal or stiff rubber strike-off and applying only what the surface demands for leveling. The second course is applied at 15 – 30 lb/yd² (8.1 – 16.3 kg/m²).
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