Computer Papers

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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. Asphalt concrete was refined and enhanced to its current state by Belgian inventor and U.S. immigrant Edward de Smedt.[2] It is increasingly being used as the core of embankment dams.[3] It is commonly called simply asphalt,[4] blacktop, or paving (particularly in North America). The terms "asphalt (or asphaltic) concrete", "bituminous asphalt concrete", and "bituminous mixture" are typically used only in engineering and construction documents and literature. The abbreviation "AC" is sometimes used for "asphalt concrete" but can also denote "asphalt content" or "asphalt cement", referring to the liquid asphalt portion of a bituminous mixture. Asphalt concrete pavements are often called just "asphalt" by laypersons who tend to associate the term "concrete" with Portland cement concrete only. The engineering definition of concrete is any composite material composed of mineral aggregate glued together with a binder, whether that binder is Portland cement, asphalt or even epoxy.

Contents [hide] 1 Mixture formulations 2 Performance characteristics 3 Asphalt concrete degradation and restoration 3.1 Prevention and repair of degradation 4 Recycling 5 See also 6 References 7 External links

Mixture formulations[edit]

As shown in this cross-section, many older roadways are smoothed by applying a thin layer of asphalt concrete to the existing portland cement concrete.
Mixing of asphalt and aggregate is accomplished in one of several ways: Hot mix asphalt concrete (commonly abbreviated as HMAC or HMA) is produced by heating the asphalt binder to decrease its viscosity, and…...

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