PAVEMENT DESIGN AND TYPES OF PAVEMENTS
Definition of Asphalt:
Asphalt concrete is a composite material commonly used in construction projects such as road surfaces, parking lots, and airports. Asphalt concrete consists of asphalt (used as a binder) mixed with mineral aggregate and then laid down in layers and compacted.
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Asphalt pavement refers to any paved road surfaced with asphalt. Hot Mix Asphalt (HMA) is a combination of approximately 95% stone, sand, or gravel bound together by asphalt cement, a product of crude oil. Asphalt cement is heated aggregate, combined, and mixed with the aggregate at an HMA facility. The resulting Hot Mix Asphalt is loaded into trucks for transport to the paving site. The trucks dump the Hot Mix Asphalt into hoppers located at the front of paving machines. The asphalt is placed, and then compacted using a heavy roller, which is driven over the asphalt. Traffic is generally permitted on the pavement as soon as the pavement has cooled.
Ambient (air) temperatures, base (aggregate and existing asphalt) temperatures, and hot mixed asphalt temperatures are very critical to obtaining compaction and longevity of the newly paved surfaces and patches.
Hot mixed asphalt is manufactured at temperatures between 270°F and 325°F. Depending on the environmental conditions and the distance from the hot mix plant to the project, hot mix asphalt can lose between 5°F and 25°F.
The temperature of the mix on the base after it has passed through the laydown machine – not the mix or manufacturing temperature – is the most important factor in determining the available time for compaction. Hot mix asphalt pavement arrives at a project at temperatures between 275°F and 300°F and is installed on the existing base by mechanical methods (laydown machines).
If the air and base temperatures are colder than required or specified, then the asphalt pavement will cool too fast, causing it to set up and making it very difficult to obtain the required or specified compacted density.
Thin pavement layers will cool quicker than thicker layers, and should the base or ambient temperature be low, the hot mix asphalt will cool quicker, density won’t be achieved, and the patch will ravel and fall apart. On paving and overlay projects, if the hot mix asphalt pavement cools too quickly, the entire surface will ravel leaving a rough, rocky surface in a short period of time. This not only results in a poor surface, it results in a surface that will retain water, reducing the life of the pavement or the patch by accelerating the raveling process. It is very important to monitor all temperatures (ambient, base, and hot mix asphalt) and wind velocity during the paving process.
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download link: Pavement design and types of pavements
Also check: Theodolite Traversing in Surveying
download link: Pavement design and types of pavements
Also check: Theodolite Traversing in Surveying
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ReplyDeleteThank you for sharing this detailed overview. It's posts like these that contribute significantly to the knowledge base of anyone interested in the nuances of pavement technology. Parkway Paving LLC
ReplyDeleteHot mix asphalt offers durability and flexibility, making it a top choice for roads. Rigid pavements like concrete provide strength, while flexible pavements offer resilience. Great overview!Paterson Asphalt Paving.
ReplyDeleteHot mix asphalt pavements offer durability and flexibility, while rigid pavements like concrete boast strength and longevity. Both play vital roles in modern infrastructure.Paterson Asphalt Paving.
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