How long should a bituminous prime coat be left undisturbed?

A bituminous prime coat is a crucial layer in asphalt pavement construction, serving to bond the substrate with the subsequent layers of asphalt. Leaving it undisturbed for the correct amount of time ensures that it adequately penetrates the base and forms a solid bond, which is vital for the durability and performance of the pavement.

Typically, a bituminous prime coat should be left undisturbed for 24 hours. This timeframe allows the material to cure properly and achieve a sufficient bond before any traffic or further construction activities take place. If disturbed too soon, the integrity of the bond could be compromised, leading to potential issues such as surface stripping or reduced lifespan of the pavement.

While other options may suggest various durations, they do not align with standard practices established in asphalt paving. For instance, a duration shorter than 24 hours might not provide sufficient curing time, while a longer duration could unnecessarily delay project completion without added benefits. Therefore, 24 hours is the most widely accepted and practical recommendation for allowing a bituminous prime coat to properly cure before the next steps in construction are undertaken.