When hot mix asphalt is brought to a project site, it should have a temperature of 275 to 300 degrees Fahrenheit. During the initial application, the asphalt temperature should be between 220 and 290 degrees Fahrenheit. As it cools, it should drop to 150 to 180 degrees Fahrenheit.
Asphalt laid at temperatures below 100 degrees Fahrenheit may require additional coats or blankets under the pavement to bring it up to recommended temperatures. Laying asphalt at temperatures above 200 degrees Fahrenheit may cause it to become less flexible and more brittle.
The thickness of the layer depends on the size of the area being paved. Paving materials are usually applied in thin layers so that they can heat up during the paving process and become soft enough to mold to the contours of the road surface. The thickness of the layer also affects how long it takes the pavement to warm up after it has been laid. Thicker layers take longer to heat up.
Asphalt prices generally increase as the temperature rises. This means that you should avoid laying asphalt at temperatures higher than 400 degrees Fahrenheit if you can help it.
Laying asphalt at temperatures higher than 400 degrees Fahrenheit may cause it to become less flexible and more brittle.
The best time to lay asphalt is early in the morning before it gets too hot.
When the temperature outside reaches 120 degrees Fahrenheit, asphalt can also melt. While this level of heat is unusual, keep in mind that asphalt itself retains heat! The asphalt itself should be kept at 250–325 degrees Fahrenheit to maintain adequate viscosity.
Asphalt begins to lose its strength when it is heated to about 140 degrees F. Above this point it will always break down and become soft. At 180 degrees F, it will vaporize. Asphalt remains stable up to 300 degrees F, but any more heat and it will start to break down.
The melting point of asphalt varies depending on what kind you get. General purpose asphalt melts around 160 degrees F. Hot-mix asphalt, which is used for road surfaces designed for heavy traffic, melts at about 220 degrees F. Blacktop asphalt, which is used for streets and parking lots where light traffic is expected, has a melting point of about 330 degrees F.
Asphalt becomes brittle when it is cold. It needs to be heated until it is fluid enough to spread evenly across the surface you want it on. Too much or too little heat will affect how it looks after being cooled.
Asphalt pavement lasts longer if it is not exposed to extreme temperatures. If it gets too hot, it will break down; if it gets too cold, it will crack.
On average, warm-mix asphalt costs $45 to $90 per ton. While hot-mix asphalt requires high temperatures of 250 degF to 350 degF to bond the pavement, warm-mix asphalt (WMA) includes unique additives that allow it to be paved at temperatures as low as 150 degF to 250 degF. The benefits and drawbacks of warm-mix asphalt are as follows: In cooler areas, slower cooling allows for longer-distance delivery and pavement. WMA also tends to have better traction in snow and ice than hot-mix asphalt.
The price of warm-mix asphalt depends on several factors such as type, quality, and age of the material. Pavement that is older and of lower quality will usually cost more. Warm-mix asphalt can range in price from $45 to $90 per ton.
Warm-mix asphalt is cheaper to produce than hot-mix asphalt because it requires no special equipment other than a roller truck. Also, less fuel is used during paving with WMA because it does not need to be heated before being rolled out. Finally, WMA takes longer to cool down after being laid so more time goes by before it needs to be replaced.
Warm-mix asphalt is available from specialty suppliers of recycled asphalt pavement (RAP). RAP is asphalt pavement that has been remixed and resold multiple times before being placed in the road. This reuse of asphalt increases its lifespan while reducing the amount of waste created when old roads are removed.
There are two types of WMA: pure and modified.
Typically, hot mix asphalt is sold by the ton and coverage. The majority of asphalt mixtures used for driveways and parking lots weigh 145 pounds per cubic foot of covering. You may, however, use the above-mentioned method or an asphalt calculator to determine the amount of asphalt required for any job. Asphalt weights vary based on type and brand but most range from 220 to 250 pounds per cubic foot.
Asphalt is heavy. Therefore, it's important to include this cost in your budget when estimating the total price of a project. Hot mix asphalts are usually priced by the truck load. For example, a typical price per square foot for such asphalt ranges from $30 to $50 depending on quality and brand. However, these prices do not account for excavation or other site work which will increase your overall project cost.
The weight of hot mix asphalt also means that large trucks are needed to transport it to jobsites. These trucks must be able to navigate roads with ample space to allow for unloading and loading of material. In some cases, where access is limited or there is no suitable road available, asphalt can be delivered in bulk bags by a haulier who specializes in this type of work. This often results in significant savings over using traditional dump trucks.
Finally, the weight of hot mix asphalt means that projects can be done only at certain times of the year when weather conditions are favorable for transporting and laying down material.
According to several sites, including Yahoo.com, on a 108-degree day, the asphalt surface may reach temperatures of up to 160 degrees. Human skin, by the way, may begin to really burn around 140 degrees Fahrenheit, which is hot enough to inflict harm. When the pavement reaches 140-160 degrees Fahrenheit, it begins to soften. At that point, you should stop using your tool until it has cooled down.
The best way to avoid being burned by hot asphalt is to not use any tool other than your finger to push off of it when it is hot. If you have to use a tool, make sure it is not metal because it will heat up and cause damage even after it has cooled down.
Asphalt becomes softer at higher temperatures. On very hot days, when the air temperature reaches 110 degrees F or more, some experts say that asphalt surfaces should be avoided entirely because they are too dangerous to drive on. But on average daily temperatures below 110 degrees F, you can travel without risk if you exercise caution and know what you're doing.
The best time to hit the road on hot asphalt is during the morning commute when it's still cold out. As the day progresses and the temperature rises, so will the danger level. Be aware of changing conditions and plan your trip accordingly.
If you must drive on hot asphalt in the evening, try to do so near sunset when temperatures are usually cooler.