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Thermal Stability of Cast-in-Place Asphalt Mixtures
2019-01-23
Cast-in-place asphalt mixtures are a type of asphalt concrete classified according to their construction process. They feature a suspended dense structure and are characterized by high fine aggregate content, high mineral powder content, and high asphalt content. Cast-in-place asphalt concrete is impermeable, resistant to freeze-thaw cycles, oil-resistant, and age-resistant, with excellent performance in resisting low-temperature cracking and fatigue cracking. Due to its relatively high asphalt content, cast-in-place asphalt concrete is prone to rutting under high-temperature conditions. Since cast-in-place asphalt mixtures differ significantly from conventional asphalt mixtures—being produced through prolonged high-temperature mixing of high-asphalt-content, high-viscosity asphalt combined with high proportions of mineral powder—and since their design aims almost exclusively for zero porosity, the mix-design approach for cast-in-place asphalt mixtures differs substantially from that used for other types of asphalt mixtures.
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