US2016090701A1PendingUtilityA1

Process for cold-in-place recycling using foamed asphalt and lubrication additive

49
Assignee: ALM HOLDING COPriority: Aug 5, 2008Filed: Oct 2, 2015Published: Mar 31, 2016
Est. expiryAug 5, 2028(~2.1 yrs left)· nominal 20-yr term from priority
Inventors:Gerald H. ReinkeDavid LangeGaylon L. BaumgardnerErvin Dukatz
E01C 7/18E01C 19/08E01C 23/12C08J 2395/00C08L 2555/22E01C 7/353E01C 19/05E01C 19/1004C08L 95/00C04B 2111/0075Y10T428/2991C08L 95/005E01C 2301/50E01C 7/22E01C 19/16E01C 7/265E01C 11/005C04B 26/26C08J 9/00C09D 195/005E01C 23/065E01C 7/20E01C 7/08E01C 7/187Y02A30/30Y02W30/91
49
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

Cold-in-place asphalt recycling is disclosed. A foamed asphalt may be produced by injecting water and optionally compressed air into a hot asphalt stream. A lubricating surfactant may be added to the hot asphalt stream to improve performance. The foamed asphalt may be mixed with reclaimed material to provide a uniformly coated paving material that can compacted to a desired density.

Claims

exact text as granted — not AI-modified
1 . A method for forming a foamed asphalt binder, which method comprises:
 injecting water and optionally a lubricating surfactant or compressed air into a hot stream of an asphalt binder containing a lubricating cationic surfactant, to form the foamed asphalt binder.   
     
     
         2 . The method of  claim 1 , further comprising:
 milling an existing pavement surface to a desired depth to provide milled bituminous material on-site;   combining the milled bituminous material with the foamed asphalt binder to produce a paving material; and   compacting the paving material on-site to provide a recycled pavement surface.   
     
     
         3 . The method of  claim 2 , wherein the recycled paving surface has a density, measured two days after compacting, of at least about 88 percent of the theoretical maximum density. 
     
     
         4 . The method of  claim 2  comprising combining virgin aggregate and the milled bituminous material with the foamed asphalt binder. 
     
     
         5 . The method of  claim 2 , comprising laying the paving material using a paver. 
     
     
         6 . The method of  claim 2 , comprising laying the paving material using a grader. 
     
     
         7 . The method of  claim 2 , wherein the lubricating cationic surfactant reduces the temperature needed for construction, including laying and compacting the paving material, by as much as 60° F. 
     
     
         8 . The method of  claim 1 , comprising combining the milled bituminous material with the foamed asphalt binder in an amount of about 0.5 to 4 percent asphalt binder by weight of milled bituminous material. 
     
     
         9 . The method of  claim 1 , wherein compressed air is injected into the hot stream of asphalt binder containing lubricating cationic surfactant. 
     
     
         10 . The method of  claim 1 , wherein lubricating surfactant is injected into the hot stream of asphalt binder containing lubricating cationic surfactant. 
     
     
         11 . The method of  claim 1 , wherein the lubricating cationic surfactant comprises an alkyl amine, alkyl quaternary ammonium salt, heterocyclic quaternary ammonium salt, amido amine or non-nitrogenous sulfur or phosphorous derivative. 
     
     
         12 . The method of  claim 1 , wherein the lubricating cationic surfactant comprises an ethoxylated di amine. 
     
     
         13 . The method of  claim 1 , wherein the lubricating cationic surfactant comprises an ethoxylated tallow amine. 
     
     
         14 . The method of  claim 1 , wherein the lubricating cationic surfactant comprises tris(2-hydroxyethyl)-N-tallow-alkyl-1,3-diaminopropane. 
     
     
         15 . The method of  claim 1 , wherein the lubricating cationic surfactant is an ethoxylated diamine or an ethoxylated tallow amine in an amount of about 0.05 to about 3 weight percent of the asphalt binder. 
     
     
         16 . The method of  claim 1 , wherein the foamed asphalt binder is formed from about 0.5 to about 5 weight percent water and about 0.05 to about 3 weight percent ethoxylated diamine or ethoxylated tallow amine. 
     
     
         17 . The method of  claim 1 , wherein the hot stream of asphalt binder containing lubricating cationic surfactant is at a temperature greater than about 300° F. 
     
     
         18 . The method of  claim 17 , wherein the hot stream of asphalt binder containing lubricating cationic surfactant is at a temperature of about 300° F. to about 380° F. 
     
     
         19 . The method of  claim 17 , wherein the hot stream of asphalt binder containing lubricating cationic surfactant is at a temperature of about 320° F. to about 360° F. 
     
     
         20 . The method of  claim 1 , wherein the foamed asphalt binder produces a uniformly coated paving material. 
     
     
         21 . A cold-in-place asphalt recycling method to prepare a recycled asphalt pavement surface, which method comprises:
 producing a foamed asphalt binder by injecting water and optionally a lubricating surfactant or compressed air into a hot stream of an asphalt binder containing a lubricating cationic surfactant;   in a continuous mixing process, milling an existing pavement surface to provide milled bituminous material and combining the foamed asphalt binder with the milled bituminous material to produce a recycled bituminous mix;   conveying the recycled bituminous mix into a paver;   laying the recycled bituminous mix onto an existing grade; and   compacting the recycled bituminous mix to form a recycled asphalt pavement surface.   
     
     
         22 . The method of  claim 21 , wherein the foamed asphalt binder comprises about 0.5 to about 5 weight percent water and about 0.05 to about 3 weight percent lubricating cationic surfactant. 
     
     
         23 . The method of  claim 21 , wherein the hot stream of asphalt binder containing lubricating cationic surfactant is at a temperature greater than about 300° F. 
     
     
         24 . The method of  claim 23 , wherein the hot stream of asphalt binder containing lubricating cationic surfactant is at a temperature of about 300° F. to about 380° F. 
     
     
         25 . The method of  claim 23 , wherein the hot stream of asphalt binder containing lubricating cationic surfactant is at a temperature of about 320° F. to about 360° F. 
     
     
         26 . The method of  claim 21 , wherein the lubricating cationic surfactant is an ethoxylated diamine or an ethoxylated tallow amine. 
     
     
         27 . The method of  claim 21 , wherein the lubricating cationic surfactant comprises tris hydroxyethyl)-N-tallow-alkyl-1,3-diaminopropane. 
     
     
         28 . The method of  claim 21 , comprising combining virgin aggregate and the milled bituminous material with the foamed asphalt binder. 
     
     
         29 . The method of  claim 21 , further comprising crushing the milled bituminous material. 
     
     
         30 . The method of  claim 21 , wherein the lubricating cationic surfactant reduces the temperature needed for construction, including laying and compacting the recycled bituminous mix, by as much as 60° F. 
     
     
         31 . The method of  claim 21 , further comprising placing a hot mix asphalt layer on the recycled asphalt pavement surface.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.