Road American
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Tack coat specs focus on residual binder application rate, emulsion grade and setting behavior, and uniform coverage. The specification should define required binder content, viscosity limits, and acceptance tests, then require field calibration of the sprayer to deliver the target residual binder mass per square meter. It should also address surface cleanliness, moisture limits, and curing requirements before overlay. Practical controls include nozzle selection, spray bar height, pressure stability, and tray tests to confirm transverse uniformity. Bond performance depends as much on correct rate and surface prep as on the emulsion grade itself.
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