Road American
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Tack coat grade selection depends on local specifications, climate, and traffic management, but cationic rapid or medium setting tack grades are commonly used to achieve quick bond and return to paving operations. Spray rate is typically controlled by residual binder requirement, surface texture, and whether the surface is milled or smooth. The correct approach is to specify residual binder per square meter and calculate emulsion application based on residue percentage. Calibration trials are essential because over application causes slippage and flushing, while under application reduces interlayer bond strength.
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