Patents Assigned to Road Science, L.L.C.
  • Patent number: 7802941
    Abstract: The present invention is directed to a rut resistant coating and a method for applying the rut resistant coating on an existing surface for increasing resistance to high vertical and horizontal strains and high shear stresses. The method includes applying a binding material layer of the rut resistant coating on the existing surface to provide a substantially impermeable moisture barrier to the existing surface, the binding material layer containing less than about 11% of the total binding material of the rut resistant coating. After applying the binding material layer, an aggregate mixture layer is applied on the binding material layer to provide the wear surface of the rut resistant coating and support and structure to the rut resistant coating to resist rutting, the aggregate mixture layer containing an asphalt solution.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: September 28, 2010
    Assignee: Road Science, L.L.C.
    Inventors: Jon Brett Wingo, Marvin Keller Exline, James Joseph Cunningham, Jr.
  • Patent number: 7798744
    Abstract: This invention relates to a novel seal coat process and equipment for applying the seal coat to improve the reliability of seal coat aggregate retention to the surface of the pavement by increasing the surface area of aggregate covered with binder and interlocking the aggregate with finer gradation material such as choke stone. It also relates to the use of lower amounts of asphalt binder, lower amounts of aggregate application, lower quality of aggregates, use of softer binders, and faster release to traffic times.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: September 21, 2010
    Assignee: Road Science, L.L.C.
    Inventors: Larry Larson, John Domichel
  • Patent number: 7709106
    Abstract: A highly strain tolerant, substantially moisture impermeable, reflective crack relief interlayer is provided. The interlayer includes a polymer modified asphalt binder mixed with a dense fine aggregate mixture containing a substantial amount of manufactured sand. The interlayer mix is designed using a fatigue test and a stability test. Preferably, a hot mix asphalt overlay that is compatible with the interlayer, as well as the demands of local traffic and climate, is placed over the interlayer so that a protected, smooth paved surface is provided. The interlayer may delay the first appearance of cracks and the severity of cracks for several years compared with traditional hot mix overlays and extend pavement service life.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: May 4, 2010
    Assignee: Road Science, L.L.C.
    Inventors: Phillip B. Blankenship, Richard Kent Steger, Richard W. May