US 12,435,476 B2
High-friction road patch
Raymond L. Powell, Auburn, AL (US); and Jason Nelson, Auburn, AL (US)
Assigned to Auburn University, Auburn, AL (US)
Filed by AUBURN UNIVERSITY, Auburn, AL (US)
Filed on Sep. 24, 2021, as Appl. No. 17/484,892.
Claims priority of provisional application 63/213,070, filed on Jun. 21, 2021.
Claims priority of provisional application 63/083,312, filed on Sep. 25, 2020.
Prior Publication US 2022/0098801 A1, Mar. 31, 2022
Int. Cl. E01C 11/24 (2006.01); E01C 5/08 (2006.01); E01C 5/12 (2006.01)
CPC E01C 11/24 (2013.01) [E01C 5/085 (2013.01); E01C 5/12 (2013.01); E01C 2201/167 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A layered, pre-fabricated overlay for enhancing road surface friction, comprising:
a first layer composed of cured bitumen comprising aggregate particles at least partially embedded therein and exposed to contact with automobile tires, wherein the aggregate particles comprise calcined bauxite and wherein the aggregate particles provide increased surface friction above a surface friction of the road surface;
a second layer disposed beneath said first layer and comprising viscous bitumen; said second layer further comprising a reinforcement component selected from a group consisting of: a) fibrous material disposed within said viscous bitumen; b) a mesh screen encapsulated within said viscous bitumen; and c) a combination of a) and b); and
a binder layer on an underside of the second layer for bonding the overlay with the road surface, wherein the road surface is heated to a temperature of between 75° F. and 150° F. before the overlay is applied to the road surface.