AU6502899A - Composite roadway fabric - Google Patents
Composite roadway fabric Download PDFInfo
- Publication number
- AU6502899A AU6502899A AU65028/99A AU6502899A AU6502899A AU 6502899 A AU6502899 A AU 6502899A AU 65028/99 A AU65028/99 A AU 65028/99A AU 6502899 A AU6502899 A AU 6502899A AU 6502899 A AU6502899 A AU 6502899A
- Authority
- AU
- Australia
- Prior art keywords
- fabric
- layer
- asphalt
- roadway
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004744 fabric Substances 0.000 title claims description 56
- 239000002131 composite material Substances 0.000 title claims description 20
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- 239000003365 glass fiber Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 39
- 239000010426 asphalt Substances 0.000 description 34
- 239000000463 material Substances 0.000 description 18
- 239000011521 glass Substances 0.000 description 12
- 239000011152 fibreglass Substances 0.000 description 10
- 239000000835 fiber Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000004745 nonwoven fabric Substances 0.000 description 7
- 239000004567 concrete Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- 238000004078 waterproofing Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 4
- 239000013521 mastic Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 239000011384 asphalt concrete Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002982 water resistant material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229920006397 acrylic thermoplastic Polymers 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003366 poly(p-phenylene terephthalamide) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000012261 resinous substance Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/12—Pavings made of prefabricated single units made of units with bituminous binders or from bituminous material, e.g. asphalt mats
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/10—Fibres of continuous length
- B32B2305/20—Fibres of continuous length in the form of a non-woven mat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
Description
WO00/18574 PCT/US99/22641 1 COMPOSITE ROADWAY FABRIC FIELD OF THE INVENTION The present invention relates in general to reinforced, water-resistant structures used in water 5 proofing applications and in particular, to reinforced roadway structures. BACKGROUND OF THE INVENTION Many outdoor surfacing applications have employed asphalt for its weather resistance and superior 10 mechanical properties under heavy loads. Asphalt is a dark cementitious material composed predominantly of bitumens. Most asphalts are now produced from the refining of petroleum and are used primarily in paving and roofing applications. At normal service 15 temperatures asphalt is viscoelastic; at higher temperatures, it becomes viscous. The water resistance of asphalt layers is essential to its durability. Asphalts that have a low content of soluble salts show a low water absorption. 20 When asphalt picks up water, it softens and blisters. Bacteria and fungi are also known to attack the very low molecular weight portion of bituminous materials.
WO00/18574 PCT/US99/22641 2 Exposed asphalt films have, additionally, been known to harden and crack when exposed to ultraviolet radiation. Asphalt-mastics are known to include mineral 5 (including glass) fillers which are added to influence their flow properties and reduce costs. Mineral filled films show proven resistance to flow at elevated temperatures, improved impact resistance and better flame-spread resistance. Fillers may also 10 increase the water absorption of asphalt, and can include ground limestone, slate flowers, finely divided silica, trapped rocks, and mica. Opaque fillers offer protection from weathering, and asbestos filler, because of its fibrous structure can be added 15 to improve toughness. Asbestos fibers have also been added to asphalt paving mixes to increase the resistance to movement under traffic, and in roofing materials, for fire-retardant purposes. Numerous approaches have been suggested for 20 reinforcing and/or waterproofing asphalt and concrete pavement and similar structures, including both new and existing structures. Most involve sequential installation of several layers at the job site. For example, the Road Glass system, a product of Owens 25 Corning Fiberglass, involves melting asphalt-based mastic onto the targeted surface, followed by the application of a fiberglass layer, and then, an additional layer of asphalt mastic is provided to produce a composite reinforced structure. 30 Nonwoven fabric such as Petromat manufactured by Atlantic Construction Fabrics, Inc. is used primarily for waterproofing road bases prior to application of asphalt wear course layers. Petromat is a needle punched nonwoven polypropylene geotextile. The fabric 35 is heat bonded, meaning the fibers are fused on one WO00/18574 PCT/US99/22641 3 side to prevent bleed through of the tack coat and water from reaching the underlying road layers. Petromat has comparatively low modulus of elasticity and thus provides limited reflective cracking 5 resistance. U.S. Patent No. 4,151,025 discloses a method for waterproofing concrete bride decks including cleaning the bridge deck, applying primer to the deck, applying a membrane to the primer followed by a tack coat and a 10 layer of asphalt. The membrane includes a lower layer of uncured elastomer, a fabric layer and an upper layer of cured elastomer. The membrane is heated to about 175 0 F and rolled prior to placement of the tack coat to bond the lower layer of uncured asphalt to the 15 bridge deck. The fabric layer is a single layer of open-mesh, natural or synthetic fabric. The fabric is not disclosed as being high strength or high modulus material nor is it pre-impregnated or otherwise pretreated to enhance its or the membrane's strength 20 or other physical characteristics. U.S. Patent No. 4,699,542 describes a system including method and apparatus for reinforcing asphaltic overlays applied to underlying pavements. A tack coat is initially applied to the pavement 25 followed by a layer of resin-impregnated, open-mesh, semi-rigid fiberglass fabric. An asphaltic mixture overlay is then applied to the fabric. The fiberglass fabric has a high modulus of elasticity which improves the strength of the asphaltic overlay and inhibits 30 propagation of reflective cracks in the overlay. Resin impregnation serves to coat the glass strands and protects them from degradation arising from internally induced and externally applied harm such as friction between the strand filaments and corrosion WO00/18574 PCT/US99/22641 4 associated with invasion by water, particularly high pH water created by the use of salt on roads. U.S. Patent Nos. 4,957,390, 5,110,627, 5,246,306 and 5,393,559 disclose systems similar to U.S. Patent 5 No. 4,699,542. Rather than using a tack coat, the resin-impregnated glass fabric is adhered to the underlying pavement by a pressure or heat activatable adhesive carried by fabric. U.S. Patent Nos. 5,152, and 5,273,804 disclose 10 methods for reinforcing a paved roadway surface using an open mesh/fabric laminate. The paved roadway surface is produced by applying a tack coat to an underlying road base followed by the laminate which is placed fabric side down on the road base. A second 15 tack coat is then applied to the laminate followed by a layer of asphalt. The preferred fabrics are indicated as needled continuous filaments or staple fibers although woven or knitted fabrics could be used. The mesh structure is preferably polypropylene 20 or polyester mesh. The fabric is provided to promote adherence of the laminate to the road base. It is mechanically bonded to the mesh at thickened mesh nodules, whereby the fabric is spaced somewhat from the strands of the mesh. The spacing of the mesh from 25 the fabric enables overlying asphalt aggregate to penetrate the mesh and interlock with the strands of the mesh and thereby reinforce the roadway surface. Although providing some degree of reinforcement, polypropylene, polyester or similar plastic meshes 30 have comparatively low Young's moduli of elasticity, i.e., on the order of about 10,000 to about 200,000 psi. Such low modulus materials experience far greater strain and creep under comparable loads than, for example, glass fiber meshes which have Young's 35 moduli typically ranging from about 1,000,000 about WO00/18574 PCT/US99/22641 5 4,000,000 psi, and thus have limited capacity to resist new and reflective cracking in the asphalt overlayers versus higher modulus materials. Polyfelt Geosynthetics Group markets a product 5 known as PGM-P which is a composite reinforcement for asphalt. PGM-P includes uncoated fiberglass fabric stitched to nonwoven fabric. Lacking coating, the fiberglass fabric is exposed to corrosive environmental agents and its filaments are subject to 10 damage do to friction and abrasion which tends to cause cutting of one glass filament or fiber by another. Moreover, the uncoated glass is susceptible to damage caused by the asphalt roadway construction process and application equipment. Similar products, 15 which use uncoated, uncrimped synthetic fabric instead of uncoated fiberglass fabric, are disclosed in U.S. Patent Nos. 4,472,086 and 4,540,311. Chomarat & Cie of Cheylard, France, markets a product under the name Rotoflex which is a composite 20 roadway fabric including a coated, fiberglass laid scrim sandwiched between two layers of nonwoven material. The fabric may be placed either side down and the nonwoven material facilitates adherence of the fabric to a tack coat. A disadvantage of Rotoflex 25 fabric is that provision of the nonwoven materials both above and below the fiberglass scrim is that the aggregate commonly present in asphaltic concretes cannot effectively penetrate the nonwoven material and interlock with the scrim in a manner to fully exploit 30 the high modulus/low creep characteristics of the scrim. An advantage exists, therefore, for a roadway fabric which possesses a desirable combination of features which incorporate the high modulus/low creep 35 characteristics of fiberglass material with the WO00/18574 PCT/US99/22641 6 waterproofing and tack enhancing characteristics of nonwoven material. SUMMARY OF THE INVENTION The roadway fabric according to the invention is 5 a composite assembly which consists essentially of a first layer of open mesh, bi-axially oriented high modulus/low creep fiber material secured to a second layer of substantially water-resistant material. The first layer is pre-impregnated with a resinous 10 substance which is compatible with asphalt and the roadway fabric is preferably disposed with the water resistant material facing downwardly to enhance adhesion of the fabric to the underlying roadway substrate. The open mesh of the first layer is 15 operable to interengage with the aggregate present in asphalt concrete. In so doing, the high modulus/low creep characteristics of the open mesh material are exploited to inhibit cracking in the overlying asphalt, either in the form of new cracking or 20 reflective cracking resulting from cracks in the underlying road structure. The second layer of water resistant material promotes adherence of the roadway fabric to, as well as waterproofing of, the underlying road surface. 25 BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a cross sectional view of a fabric according to the present invention. DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, the composite roadway fabric 30 according to the present invention may be deployed in new and existing roadway installations and preferably includes a first layer 10 constructed as a scrim or knit grid, desirably an open mesh, bi-axially oriented, fiber fabric having a tensile strength of at WO00/18574 PCTIUS99/22641 7 least about 250 pounds/inch, and preferably greater than 300-500 pounds/inch which is preferably thermally stable to at least 400°F. The grid may be formed of strands of continuous filament glass fibers, having 5 moduli of elasticity of at least about 1,000,000 psi, though other high modulus fibers such as polyamide fibers of poly(p-phenylene terephthalamide), known as KEVLAR®, may be used. Various deniers and grid patterns can be used so long as the patterns provide a 10 sufficient mechanical strength to the resulting structure and are easily penetrated by molten asphalt. ECR or E glass rovings of weights ranging from about 300 to about 5000 tex are preferred. These strands, which are preferably low-twist (i.e., about one turn 15 per inch or less), are formed into grids with rectangular or square openings, preferably ranging in size from 0.25 to about 0.5 inch on a side, though grids ranging from 0.125 inch to six inches on a side may be used. The grids are preferably stitched or 20 otherwise fixedly connected at the intersections of the crosswise and lengthwise strands. This connection holds the reinforcement in its grid pattern, prevents the strands from spreading out unduly before and during impregnation, and preserves the openings. 25 The large grid openings permit the asphalt mixture to encapsulate each strand of yarn or roving completely and permit substantial interengagement between aggregate in the asphalt concrete and the grid-like first layer 10. This permits substantial 30 transfer of stresses from the asphalt wear course or the road substrate to the glass fibers, thereby increasing the strength of the asphalt wear course. The first layer 10 has a high modulus of elasticity and a high strength to cost ratio, its coefficient of 35 expansion approximates that of road construction materials, and it resists corrosion by materials used WO00/18574 PCT/US99/22641 8 in road construction and found in the road environment, such as road salt. The fixed connections at the intersections of the grid also contribute to the strength of the grid 5 because they permit forces parallel to one set of strands to be transferred in part to the other set of parallel strands. At the same time, this open grid construction makes possible the use of less glass per square yard and therefore a more economical product. 10 For example, a presently preferred grid weighs about 12 ounces per square yard, although 4 to 18 ounces per square may be used. By comparison, some prior art roadway reinforcement structures employed fabrics having weights of about 24 ounces of glass per square 15 yard. Stitching the grid intersections together on warp-knit, weft-insertion knitting equipment using 70 to 150 denier polyester is preferred. However, other methods of forming grids with fixedly-connected 20 intersections may be utilized. For example, a nonwoven grid made with thermosetting or thermoplastic adhesive may provide a suitable grid. Once the grid is formed, and before it is laid in place on paving, a resin is applied. That is to say, 25 the grid is "pre-impregnated" with resin. The viscosity of the resin is selected so that it penetrates into the strands of the grid. While the resin may not surround every filament in a glass fiber strand, the resin is generally uniformly spread across 30 the interior of the strand. This impregnation makes the grid compatible with asphalt, imparts a semi-rigid nature to it, and cushions and protects the glass strands and filaments from corrosion by water and other elements. The impregnation also reduces 35 abrasion between glass strands or filaments and the cutting of one glass strand or filament by another, which is particularly important after the grid has WO00/18574 PCTIUS99/22641 9 been laid down but before the asphalt overlayment has been applied. While drying or curing the resin on the grid, the strands may be somewhat flattened, but the grid-like 5 openings are maintained. For example, in a preferred embodiment, a rectangular grid may be formed, with the rovings flattened to about 1/16 inch, whereby the thickness of the rovings after coating and drying was about 1/32 inch or less. 10 Many resins can be used for impregnating the grid, provided they are such that adhesives can be bonded to them well. Primary examples are asphalt, rubber modified asphalt, crosslinked and uncrosslinked acrylics and polyvinyl alcohol, unsaturated 15 polyesters, vinyl ester, epoxies, polyacrylates, polyurethanes, polyolefins, and phenolics which give the required rigidity, compatibility, corrosion resistance and thermal stability. They may be applied using hotmelt, emulsion, solvent, thermal-cure or 20 radiation-cure systems. Alternatively, an asphaltic emulsion modified with a polymeric material, such as an acrylic polymer, can be padded onto the grid and thermally cured. Such modification of the asphalt makes it possible to achieve a coating which is less 25 brittle at low temperatures. The composite roadway fabric according to the invention further preferably comprises a second layer 30 of material which may be a woven or, more preferably, a nonwoven fabric that is substantially 30 resistant to passage of water therethrough. It should be thermally resistant to at least 400 0 F and functions to waterproof the underlying roadway while enhancing adherence of the composite fabric structure to the roadway. A presently preferred nonwoven fabric, 35 because of its ready availability and relatively low cost is needle-punched polypropylene fabric such as the aforementioned Petromat product. Other suitable WO00/18574 PCT/US99/22641 10 nonwoven fabrics include spun bonded materials, knitted materials and needle-punched polyester. The preferred weight of the nonwoven fabric is about 2 to 8 oz/yd 2 , and more preferably, about 3 to 5 oz/yd 2 5 However, the actual grade, composition, or source of nonwoven fabric is not of great concern so long as it has been employed in or can be demonstrated to be of beneficial use in roadway waterproofing applications. Composite roadway fabric structures according to 10 this invention may be manufactured by many processes. For example, the first layer 10 and second layer 30 may be mechanically attached together by stitching 40, stapling or the like. Alternatively, a pressure and/or heat sensitive adhesive 20 may be applied to 15 one or both of the first and second layers 10, 30 and they may thereafter be pressed together, with simultaneous application of heat if necessary. As a further alternative, the second layer 30 may be united with the first layer 10 by the resinous substance 20 which impregnates the first layer 10. That is, the first layer 10 may be impregnated and coated by the resin and the second layer 30 may be contacted and become bonded with the first layer 10 upon curing of the resin. Still further, asphalt emulsion may be 25 sprayed onto the first and second layers 10, 30, or by dipping these layers through a molten mastic tank having a temperature of about 400 0 -420 0 F. The first and second layers 10, 30 can be unwound from a pair of rolls during such coating and bonding and the 30 resulting coated composite fabric can be dried at ambient temperature or sent through a drying oven prior to cutting and rolling the mastic into a convenient form, such as a roll or patch. Preferably, however, a pressure sensitive 35 adhesive 20 such as that described in U.S. Patent No. 5,110,627 (the disclosure of which is incorporated herein by reference) is used as the agent for binding DU RQ f~QAAQ1 WO00/18574 PCTIUS99/22641 11 the first and second layers 10, 30 of the composite fabric to one another. Suitable adhesives include synthetic elastomeric and synthetic thermoplastic adhesives. Included among these are acrylics, 5 styrene-butadiene rubbers, tackified asphalts and tackified olefins. When performing road rehabilitation using the composite fabric, normal surface preparation of the underlying asphaltic concrete or Portland cement 10 concrete road surface, including base repairs, crack sealing, pothole filling, and the like, is performed. A tack coat may be applied to the road surface and the fabric is unrolled and pressed against the roadway surface. The composite fabric may be disposed on the 15 underlying road surface with the first grid layer facing downwardly. More preferably, the composite fabric is installed with the grid facing upwardly to maximize interengagement of the grid with the aggregate constituents of the asphalt overlayer. In 20 lieu of a tack coat applied to the road surface, a coating of any of the aforementioned adhesives may be pre-applied to that surface of the composite fabric which contacts the underlying roadway to promote adherence thereto. A similar tack coat or adhesive 25 may also be applied to the other surface of the composite fabric to promote adherence of the fabric with the asphalt overlayer. Following placement of the composite fabric and any tack coats/adhesives on the underlying road surface and/or composite fabric, a 30 layer of asphalt concrete of suitable thickness and composition, e.g., about 50 mm of HL 1 asphaltic concrete, may be applied using conventional equipment and techniques. The resulting reinforced roadway structure 35 effectively waterproofs the underlying road structure and resists new and reflective crack formation in the asphalt overlayer.
WO00/18574 PCT/US99/22641 12 Although the invention has been described in detail for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those 5 skilled in the art without departing from the spirit and scope of the invention except as it may be limited by the claims.
Claims (6)
1. A composite roadway fabric consisting essentially of: 5 a first layer, said first layer being constructed as an open grid of resin impregnated, bi axially oriented, high modulus of elasticity strands; a second layer, said second layer being substantially water-resistant; and 10 means for attaching said first and second layers.
2. The fabric of claim 1 wherein said high modulus of elasticity strands are glass fiber strands.
3. The fabric of claim 1 wherein said second 15 layer is nonwoven.
4. The fabric of claim 1 wherein said attaching means comprise mechanical attaching means.
5. The fabric of claim 1 wherein said attaching means is an adhesive. 20
6. The fabric of claim 1 wherein said attaching means is the resin used to impregnate said strands of said first layer.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16400498A | 1998-09-30 | 1998-09-30 | |
US09164004 | 1998-09-30 | ||
PCT/US1999/022641 WO2000018574A1 (en) | 1998-09-30 | 1999-09-29 | Composite roadway fabric |
Publications (1)
Publication Number | Publication Date |
---|---|
AU6502899A true AU6502899A (en) | 2000-04-17 |
Family
ID=22592560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU65028/99A Abandoned AU6502899A (en) | 1998-09-30 | 1999-09-29 | Composite roadway fabric |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1131203A4 (en) |
CN (1) | CN1354714A (en) |
AU (1) | AU6502899A (en) |
CA (1) | CA2345980A1 (en) |
HK (1) | HK1045131A1 (en) |
WO (1) | WO2000018574A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7059800B2 (en) * | 2001-02-28 | 2006-06-13 | Owens Corning Fiberglas Technology, Inc. | Method of reinforcing and waterproofing a paved surface |
EP1714772A1 (en) * | 2005-04-20 | 2006-10-25 | Quadrant Plastic Composites AG | Composite thermoplastic intermediate product |
US20060245830A1 (en) * | 2005-04-27 | 2006-11-02 | Jon Woolstencroft | Reinforcement membrane and methods of manufacture and use |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4617219A (en) * | 1984-12-24 | 1986-10-14 | Morris Schupack | Three dimensionally reinforced fabric concrete |
US4699542A (en) * | 1985-03-13 | 1987-10-13 | Bay Mills Limited, Midland Div. | Composition for reinforcing asphaltic roads and reinforced roads using the same |
FR2592411B1 (en) * | 1985-12-26 | 1988-02-12 | Rhone Poulenc Fibres | IMPROVEMENT IN THE PROCESS AND MEANS FOR PROTECTING PAVEMENT COATINGS FROM PRIMING CRACKS |
US5246306A (en) * | 1987-11-04 | 1993-09-21 | Bay Mills Limited | Reinforcements for asphaltic paving, processes for making such reinforcements, and reinforced pavings |
US5513925A (en) * | 1994-09-19 | 1996-05-07 | The Board Of Trustees Of The University Of Illinois | Stress absorbing composite for road repair and method |
-
1999
- 1999-09-29 CN CN99813838A patent/CN1354714A/en active Pending
- 1999-09-29 CA CA002345980A patent/CA2345980A1/en not_active Abandoned
- 1999-09-29 EP EP99952988A patent/EP1131203A4/en not_active Withdrawn
- 1999-09-29 WO PCT/US1999/022641 patent/WO2000018574A1/en not_active Application Discontinuation
- 1999-09-29 AU AU65028/99A patent/AU6502899A/en not_active Abandoned
-
2002
- 2002-09-09 HK HK02106614.1A patent/HK1045131A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2000018574A1 (en) | 2000-04-06 |
CA2345980A1 (en) | 2000-04-06 |
HK1045131A1 (en) | 2002-11-15 |
EP1131203A4 (en) | 2003-01-02 |
CN1354714A (en) | 2002-06-19 |
EP1131203A1 (en) | 2001-09-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TC | Change of applicant's name (sec. 104) |
Owner name: SAINT-GOBAIN TECHNICAL FABRICS CANADA, LTD, CERTAI Free format text: FORMER NAME: BAY MILLS LIMITED, CERTAINTEED CORPORATION |
|
MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |