Road American
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Tack is specified by emulsion grade, required residual binder application rate, uniformity across the lane, and acceptable breaking and curing behavior before paving. Specs often define target residual rate by pavement type and surface condition, plus allowable dilution and distributor calibration requirements. Bond strength depends on correct surface cleaning, avoiding dust, and applying tack at a temperature where viscosity supports even coverage without runoff. Field practice uses test strips and paper or tray catch tests to verify spray rate. Over application can cause slippage or flushing, while under application leads to delamination and shear failures.
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