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US 9,175,446 B2Granted
Processing bituminous mixtures for paving at reduced temperatures
AssigneeA.L.M. Holding Company
InventorsGerald H. Reinke, Gaylon L. Baumgardner, Steven L. Engber
Life of this patent
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Abstract
Bituminous paving mixtures containing lubricating agents or additives may be prepared at hot mix temperatures and cooled, paved and compacted at temperatures 10-55° C. lower than the hot mix temperatures. The increased temperature range between the hot mix temperatures and the paving and compacting temperatures is facilitated by the improved compacting properties of the paving mixture when it includes the lubricating agents or additives.
Claims21
A bituminous paving process, which process comprises:
- a) mixing an asphalt binder, aggregate and lubricating additive at a first temperature greater than 160° C. to form a bituminous mix comprising aggregate coated with asphalt binder and lubricating additive, wherein the lubricating additive comprises a lubricating non-aqueous surfactant, non-surfactant additive, acid, or combinations thereof;
- b) hauling the bituminous mix to a paving site;
- and
- c) compacting the bituminous mix at a second temperature less than 130° C., to provide bituminous pavement having field density values greater than 90% of the maximum theoretical density for the compacted bituminous mix.
1 more element
A bituminous paving process, which process comprises:
- a) mixing an asphalt binder, aggregate and lubricating cationic surfactant comprising an alkyl amine, alkyl quaternary ammonium salt, heterocyclic quaternary ammonium salt, or amido amine at a first temperature greater than 160° C. to form a bituminous mix comprising aggregate coated with asphalt binder and lubricating cationic surfactant, wherein the bituminous mix provides increased transportation times, longer working times, or greater range of application temperatures;
- and
- b) compacting the bituminous mix at a second temperature less than 130° C. to provide bituminous pavement having field density values greater than 90% of the maximum theoretical density for the compacted bituminous mix.
Dependencies are inferred from the claim text.