Reinforced semi flexible pavement

Abstract

Pavement structure for use in applications where special requirements to load bearing capacity and durability must be fulfilled, for example in warehouses, on docks, airports, distribution centres, retail areas, goods terminals, industrial floors, production halls and other places where heavy loads and excessive wear can be expected, said material consists of an asphalt part and a slurry part, said asphalt having a porosity of 20-40%, and said slurry substantially completely fills the voids in the asphalt, the slurry being a composite material comprising a binder, additives and water, and optionally cement, microsilica, flyash or other pozzolanic materials as well as optionally sand or other fine aggregates, wherein the pavement material ( 1 ) comprises at least one reinforcement layer ( 3, 4, 21 ). Furthermore, a method for the construction of a pavement, as well as use of a material is disclosed.

1 . Pavement structure comprising a porous asphalt part and a composite material part, said composite material part comprising a binder, wherein said composite material substantially completely fills voids in the asphalt part characterised in that the pavement structure comprises at least one reinforcement layer ( 3 , 4 , 21 ).  
     
     
         2 . Pavement structure according to  claim 1 , characterised in that the reinforcement ( 3 , 4 , 21 ) is steel rods or wires, carbon wires, stainless steel rods or wires, modified and/or reinforced polymers, glassfibres or glassfibre spun wires.  
     
     
         3 . Pavement structure according to  claim 1 , characterised in that the reinforcement is a net or mesh.  
     
     
         4 . Pavement structure according to  claim 1 , characterised in that the composite material has a compressive strength in the range from below 60 MPa to more than 160 MPa, preferably from 75 MPa to 145 MPa, still more preferably from 85 MPa to 130 MPa, yet still more preferably from 100 MPa to 120 MPa, and still more preferably around 10 MPa.  
     
     
         5 . Pavement structure according to  claim 1 , characterised in that two reinforcement layers ( 3 , 4 ) are arranged in the pavement ( 1 ), one layer ( 4 ) in the lower part of the matrix and one layer ( 3 ) in the upper part of the matrix.  
     
     
         6 . Pavement structure according to  claim 1 , characterised in that the asphalt-matrix has a porosity in the range 20% to 40%, more preferably 22-35% and still more preferably between 25-30%, by volume.  
     
     
         7 . Pavement structure according to  claim 1 , characterised in that the composite material additionally and optionally may contain materials chosen among the following material groups: flyash, polymer modified cement-based binders, pozzolanic fillers, microsilica, sand, or other fine aggregate.  
     
     
         8 . Pavement structure according to  claim 1 , characterised in that the bitumen in the asphalt-matrix may be bitumen or technical bitumen.  
     
     
         9 . Pavement structure according to  claim 1 , characterised in that the binder is chosen among cements selected from the group consisting of Portland cement, low-alkali cement, sulphate-resistant cement, refractory cement, aluminate cement, slag cement and pozzolanic cement or epoxy-based polymer materials with binder qualities or hydraulic binders such as gypsum or lime.  
     
     
         10 . Use of a reinforcement in a matrix comprising a porous asphalt part and a composite material part, said material part comprises a binder and substantially completely fills voids in the asphalt part.  
     
     
         11 . Use of a reinforcement in a matrix according to  claim 10 , wherein the composite material part comprises a binder and different additives, said composite material having a compressive strength in the range from below 60 MPa to more than 160 MPa, preferably from 75 MPa to 145 MPa, still more preferably from 85 MPa to 130 MPa, yet still more preferably from 100 MPa to 120 MPa, but even more preferably around 110 MPa, said composite material substantially completely filling voids in an asphalt-matrix with a porosity between 20% and 40%, more preferably between 22% and 35% and still more preferably between 25% and 30%.  
     
     
         12 . Method for making a pavement structure comprising a porous asphalt part and a composite material part, said composite material part comprising a binder, wherein said composite material substantially completely fills voids in the asphalt part and further that the pavement structure comprises at least one reinforcement layer, the method comprising the following steps: a sub-base is prepared and compacted; a first asphalt layer is placed on the sub-base; a first reinforcement is arranged on the first asphalt layer; a second asphalt layer is arranged on the reinforcement; the asphalt layers forming an asphalt matrix which has a porosity in the range 20% to 40%; the voids in the asphalt matrix are substantially completely filled with a slurry, said slurry comprises a binder, and the slurry is allowed to harden to form the composite material part.  
     
     
         13 . A method according to  claim 12 , wherein a second reinforcement layer can be arranged on top of the second asphalt layer, and the second reinforcement layer is covered with a third asphalt layer, before the slurry is filled in the voids in the matrix.  
     
     
         14 . A method according to  claim 12 , wherein the steps of arranging another reinforcement on the previous asphalt layer is repeated, until the desired number of reinforcement layers is reached whereafter the final asphalt layer is placed, before filling the asphalt matrix with the slurry.