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Characteristics of Cast-in-Place Asphalt Mixtures
2012-08-10
Pouring-type asphalt mixture differs from conventional compacted asphalt mixtures in that it is composed of high-content, high-viscosity asphalt, a large dosage of mineral powder, and sometimes fiber additives, combined with an appropriate amount of aggregate. After being thoroughly mixed and heated at high temperatures for an extended period, this special asphalt mixture becomes highly viscous yet exhibits excellent fluidity and has a void content of less than 1%. It boasts superior waterproof performance; due to its void content being below 1%, nearly zero, it demonstrates outstanding water resistance. It also features exceptional flexibility: with a relatively high asphalt content, this mixture possesses strong deformation capacity and good ductility, allowing it to closely conform to steel bridge decks. As a result, the mixture integrates seamlessly with the bridge deck, maintaining the structural integrity of the entire system. Moreover, it exhibits outstanding durability: pouring-type asphalt mixtures typically use modified asphalt—obtained by blending high-quality natural asphalt with matrix asphalt—as the binder. Additionally, these mixtures have a higher asphalt content and greater viscosity than conventional asphalt mixtures, thereby ensuring superior long-term durability.
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