What Application Rate Should Be Used?

1.	What Application Rate Should Be Used?
Answer» You want to accomplish a very uniform application of about 0.03 to 0.05 gal/sy of RESIDUAL ASPHALT on the layer to be tackled (a paint job, so to speak). Slow-setting emulsions generally have a residual asphalt content of about 2/3. Therefore, an application rate of 0.10 to 0.15 gals/sy of the diluted material will give you the 0.03 to 0.05 gals/sy. Caution 1: Once the tack coat is applied, time must be allowed for emulsion to break (turn from brown to black) prior to placing hot mix on it. The LENGTH of time required for this to happen will depend on the WEATHER. In good paving weather, it will take only a few minutes. In marginal weather it may take several minutes. Caution 2: Never apply an emulsion tack coat to a cold pavement (below the freezing POINT). The emulsion will break, but the water and emulsifying agents will freeze and remain in the layer that has been tack coated. If either of these cautions is violated, there is a good chance that upper layer will not bond to the under layer and a slip plane will develop. You want to accomplish a very uniform application of about 0.03 to 0.05 gal/sy of residual asphalt on the layer to be tackled (a paint job, so to speak). Slow-setting emulsions generally have a residual asphalt content of about 2/3. Therefore, an application rate of 0.10 to 0.15 gals/sy of the diluted material will give you the 0.03 to 0.05 gals/sy. Caution 1: Once the tack coat is applied, time must be allowed for emulsion to break (turn from brown to black) prior to placing hot mix on it. The length of time required for this to happen will depend on the weather. In good paving weather, it will take only a few minutes. In marginal weather it may take several minutes. Caution 2: Never apply an emulsion tack coat to a cold pavement (below the freezing point). The emulsion will break, but the water and emulsifying agents will freeze and remain in the layer that has been tack coated. If either of these cautions is violated, there is a good chance that upper layer will not bond to the under layer and a slip plane will develop.

Answer»

You want to accomplish a very uniform application of about 0.03 to 0.05 gal/sy of RESIDUAL ASPHALT on the layer to be tackled (a paint job, so to speak). Slow-setting emulsions generally have a residual asphalt content of about 2/3. Therefore, an application rate of 0.10 to 0.15 gals/sy of the diluted material will give you the 0.03 to 0.05 gals/sy.

Caution 1: Once the tack coat is applied, time must be allowed for emulsion to break (turn from brown to black) prior to placing hot mix on it. The LENGTH of time required for this to happen will depend on the WEATHER. In good paving weather, it will take only a few minutes. In marginal weather it may take several minutes.

Caution 2: Never apply an emulsion tack coat to a cold pavement (below the freezing POINT). The emulsion will break, but the water and emulsifying agents will freeze and remain in the layer that has been tack coated.

If either of these cautions is violated, there is a good chance that upper layer will not bond to the under layer and a slip plane will develop.

You want to accomplish a very uniform application of about 0.03 to 0.05 gal/sy of residual asphalt on the layer to be tackled (a paint job, so to speak). Slow-setting emulsions generally have a residual asphalt content of about 2/3. Therefore, an application rate of 0.10 to 0.15 gals/sy of the diluted material will give you the 0.03 to 0.05 gals/sy.

Caution 1: Once the tack coat is applied, time must be allowed for emulsion to break (turn from brown to black) prior to placing hot mix on it. The length of time required for this to happen will depend on the weather. In good paving weather, it will take only a few minutes. In marginal weather it may take several minutes.

Caution 2: Never apply an emulsion tack coat to a cold pavement (below the freezing point). The emulsion will break, but the water and emulsifying agents will freeze and remain in the layer that has been tack coated.

If either of these cautions is violated, there is a good chance that upper layer will not bond to the under layer and a slip plane will develop.

What Application Rate Should Be Used?

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