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特許 係属中 Composite pavements combine a portland cement concrete sublayer with an asphalt. They are usually used to rehabilitate existing roadways rather than in new construction. Asphalt overlays are sometimes laid over distressed concrete to restore a smooth wearing surface.[11] A disadvantage of this method is that movement in the joints between the underlying concrete slabs, whether from thermal expansion and contraction, or from deflection of the concrete slabs from truck axle loads, usually causes cracks, called reflective cracks in the asphalt.
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