Some vital steps to compact asphalt pavements

To maintain the longevity of pavement, the work of roller operators should be accomplished perfectly and consistently.

If the operator does not follow proper settings and speed, the quality of the mat is influenced significantly and the quality plays an important role for maintain the prolonged life of the road.

Some vital factors like temperature of the mix itself, mat thickness, base temperature, environmental conditions (air temperature), and wind can significantly impact the finished density of the asphalt mat.

Out of all the factors, the two most crucial factors belong to the temperature of the mix since it circulates from under the screed of the paver and the thickness of the layer. Other important factors are the environmental air temperature and the temperature of the surface upon which the mix is placed and wind velocity (provides great impact on the rate of cooling).

As asphalt concrete mixtures cool rapidly, the compaction should be done when the mix remains hot. Normally, asphalt emerges out of the plant at about 300° F. At that temperature, it becomes significantly soft and is easily compacted.

When it cools, it becomes harden and compaction becomes very complicated.

Another vital factors is temperature. Ensure to retain the rollers right behind the pavers, no more than 300 ft. back so that the operators can make use of the temperature.

Also Read: How to estimate the material for a reinforcement concrete road

How to Use a Rolling Train: A rolling train should be used in compaction that includes a series of rollers running one after the other close behind the paver. The train begins with a double drum vibratory roller running close behind the paver to bring the initial compactive effort when the mix is still hot.

The Impact of Roller Speed: The speed at which the operator drives the vibratory roller is also important. If the speed of the roller is too fast, gaps and ripples are formed in compaction and impact crew safety if the operator remains too near by to the paver.

If proper speed is maintained, the impact spacing will be perfect to get rid of washboarding.

Temperature Zones: The following three temperature zones found in most asphalt concrete mixes should also be taken into consideration.

In the first, or upper temperature zone, the asphalt concrete mix remains considerably strong all through the compaction process. This strength expands from laydown temperature (300° F) down to roughly 240° F during which the mix becomes consistent and can support compaction so that the mix won’t shove or check under the roller.

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