It is possible to do asphalt paving in winter, but asphalt paving in winter is difficult. Certain factors will determine how possible this process will occur.

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Why is Asphalt paving in winter difficult?

In winter, asphalt paving is difficult because of colder temperatures. When the temperature drops below 50 degrees Fahrenheit, it begins to freeze and water in the mix begins to freeze as well causing a variety of other issues. It also becomes harder for equipment to function, especially with a large amount of moisture mixed into the asphalt. There are many chemicals that must be added to the asphalt during wintertime either from cold weather or from moisture runoff which can turn to ice if temperatures keep dropping. The freezing point for cold mixes is about 20 degrees Fahrenheit. In this regard, cold mixes become “hotter” than hot mixes at any given temperature. Some parts of a job may not be affected by this since high spots will remain above the freezing line but other areas might not be as lucky.

What factors help asphalt paving in winter?

The biggest factor that can help asphalt paving in winter is using warm weather mixes. Warm weather mixes are the most efficient and require the least amount of additives to ensure a suitable final product.

The second factor, though not as important, is if the client desires to let the asphalt cure for a longer amount of time. This allows more moisture to leave out of the binder and exit through fumes or slow evaporation over time.

The third factor that helps paving in winter is using cold-weather additives like calcium chloride or magnesium chloride. These chemicals can help lower down the temperature of the hot mix itself which will keep it workable on colder days.

report this adThe fourth factor that helps asphalt paving in winter is the temperature range of the mix. The colder the mix, the harder it will be for water to freeze in it. Even if this mix will sit at a certain temperature range all day, the range that it sits in will lower the amount of workable time from beginning to end.