To determine the specification rate for 52-28 tack, what should you do?

To determine the specification rate for 52-28 tack, multiplying the rate by 0.6 is the correct approach. This calculation is consistent with standard practices in asphalt paving where adjusting the application rate with a factor that reflects optimal performance yields the most effective results.

In the context of tack coat application, using 0.6 as a multiplier typically reflects the necessary adjustment to achieve a coverage rate that promotes proper bonding without excessive use of material, which can lead to issues like bleeding or instability during paving.

Understanding why the other methods are not applicable relates to the significance of proper application rates. For instance, subtracting or adding a constant value like 0.6 may not accurately reflect the adjustments needed for different conditions or specifications. Dividing the rate by 0.6 might lead to an under-application of tack coat, which can compromise the integrity of the asphalt layer being applied.

Thus, multiplying by 0.6 aligns with established procedures to ensure the tack coat is effectively applied, ensuring durability and proper bonding in the paving process.