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Publication numberUS3568579 A
Publication typeGrant
Publication dateMar 9, 1971
Filing dateAug 11, 1967
Priority dateAug 11, 1967
Publication numberUS 3568579 A, US 3568579A, US-A-3568579, US3568579 A, US3568579A
InventorsCronan Stewart C, Hoad Leslie
Original AssigneeHoad Leslie, Cronan Stewart C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Portable and flexible paving strips
US 3568579 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent Continuation-impart of application Ser. No. 479,586, Aug. 13, 196 5, abandoned.

[54] PORTABLE AND FLEXIBLE PAVING STRIPS 3 Claims, 3 Drawing Figs.

[52] U.S.Cl. 94/7, 161/406 [51] Int. Cl. E0lc7/00 [50] Field of Search [56] References Cited UNITED STATES PATENTS 293,491 2/1884 Miner 161/83 1,939,004 12/1933 Fischer... 16l/406X 2,201,537 5/1940 l-lickler l61/406X 3,028,280 4/1962 Hoffman 161/406X L lla 15 M225 Primary Examiner.1acob L. Nackenoff Attorney-Webster B. Harpman ABSTRACT: The invention relates to a flexible paving strip which provides a good load-bearing paving surface but which is also particularly well adapted for transportation in the form of rolls which are readily manually laid, either as a temporary or permanent paving surface. The portable and flexible paving strip of the present invention comprises a layer of a bituminous-base binder carried and reinforced by a flexible backing and having adhered to one side of the layer an abrasion-resistant surfacing, e.g., an aggregate, and to the other side of the layer a flexible under cover bearing a layer of release agent in contact with the binder so that the undercover, when required on laying the paving strip, can be clearly separated from binder layer.

Patented March 9,1971 3,568,579

BRIEF DESCRIPTION QF THE INVENTION There is provided by the present invention a portable paving strip comprising a flexible backing, a bituminous-base binder forming a layer carried on and reinforced by the flexible backing, an abrasion-resistant binder-forming a layer carried on and reinforced by the flexible backing, an abrasion-resistant surfacing adhered to one side of the binder layer and a flexible undercover secured to the other side of the binder layer; the flexible undercover bearing a layer of release agent in contact with the binder to enable the undercover to be separated cleanly from the binder layer, and the thickness of the binder layer being such as to enable the abrasion-resistant surfacing to act as a load-bearing surface when the paving strip is laid on a firm supporting surface.

The abrasion-resistant surfacing may be layer of aggregate although a continuous surfacing such as polyethylene could be used; and it is preferred to use a bitumen (alternatively called an asphalt) as the binder.

Among the bitumens which may be employed in the present invention, may be mentioned the following:

Petroleum Bitumens i. Straight run-A bitumen obtained after the final stages of distillation of a petroleum of suitable type.

ii. Cut-Back Bitumen-A bitumen, the viscosity of which has been reduced by the addition of a volatile diluent.

iii. Blown Bitumen-A bitumen modified by blowing of air through the bitumen, under controlled temperature conditions. This process alters the characteristics of the bitumen to give it more rubbery" properties. Bitumens so produced are known as air-blown, blown," or oxidised" grades.

iv. Colored Bitumen-A bitumen colored by addition of a proportion of powdered pigment. There are in existence, light colored bitumens which are particularly suitable for coloring pigmenting.

v. Rubberized bitumen-A bitumen containing natural or synthetic rubber. The rubber which is incorporated in the bitumen by mixing at elevated temperatures, imparts elasticity to the bitumen and increases flexibility at low temperatures and stability at high temperatures.

Natural Asphalt A naturally occurring mixture of bitumen and finely divided mineral matter which is found in well defined surface deposits. Otherwise known as Lake Asphalt.

The bitumen present in Lake Asphalt is of a fairly light color and is suitable for pigmenting with powdered colored pigments to produce a colored bitumen binder. To make Lake Asphalt suitable for use as a binder in paving strips it is necessary to reduce the viscosity by the addition of a suitable diluent, such as a petroleum distillate or coal tar distillate.

If the paving strip is to be one from which the undercover may readily be removed, a release agent may be incorporated in the paving strip during manufacture thereof, by application in the form of a thin film to the undercover before the undercover is applied to the flexible binder-carrying backing. The undercover bearing the release agent may be a material of a nonabsorbent surface, such as metal or treated paper, e.g., metal-surfaced paper or nonabsorbent plastics sheeting and the release agent may be applied thereon by screeding, rolling or spraying. Although the release agent acts upon the bitumen binder at the interface with the undercover to soften the binder, nevertheless, there is still sufficient adhesion between the binder and the undercover to prevent separation of the undercover during handling of the paving strip.

The release agent mentioned above needs to be applied to the undercover during manufacture of the paving strip but a release agent maybe used which can be incorporated in the material of the undercover beforehand. Thus, the undercover may consist of a material serving to lessen the adhesion between the binder and the undercover while still leaving the requisite degree of adhesion. An advantage of using treated paper is that it separates cleanly from the binder and that it is manufactured as such and its use as the undercover, therefore, avoids having to apply a .release agent as a step in or as a preliminary to, the manufacture of the paving strip itself. In the case when the aggregate layer or layer of other abrasion resistant material is dispensed with, the undercover may be treated on both sides with the release agent in order to prevent convolutions of the strip from sticking to each other.

In accordance with the present invention, the paving strip may be formed without the flexible backing and the aggregate of the paving strip may be replaced by a waterproof material such as polythene.

An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which:

FIG. 1. is a side elevation of the paving strip of the embodiment in flat or unrolled condition;

FIG. 2. is a like view to FIG. 1. of a modification of the paving strip thereof; and

FIG. 3. is a like view of FIG. 1. of a further modification of the paving strip thereof.

In the three FIGS., like reference numerals indicate like arts.

In FIG. 1, the paving strip shown comprises a flexible backing strip 1 impregnated with a bitumen to form a layer of binder 2. To the underside of the backing strip 1 is secured an undercover 3 bearing a thin film 4 of a release agent which although it does not prevent adhesion of the undercover to the binder layer 2 loosens the adhesion so that the undercover may be readily separated by hand. To the upper surface of the binder, a layer 5 of aggregate has been applied so that the aggregate is firmly retained by the binder. For clarity, part of the aggregate layer has been omitted from FIG. 1.

In the modification of FIG. 2, the aggregate employed in FIG. 1 has been replaced by a layer 6 of polythene (polyethylene) and in FIG. 3, the flexible backing strip 1 has been omitted. FIG. 3 as FIG. 1 omits part of the aggregate layer in the interests of clarity. It will be understood that the polythene layer could also be employed in the embodiment of FIG. 3 in place of the aggregate.

We claim:

l. A portable paving strip comprising a flexible backing, a bituminous-base binder forming a layer carried on and reinforced by the flexible backing, an abrasion-resistant surfacing adhered to one side of the binder layer and a flexible undercover secured to the other side of the binder layer; the flexible undercover bearing a layer of release agent in contact with the binder to enable the undercover to be separated cleanly from the binder layer, and the thickness of the binder layer being such as to enable the abrasion-resistant surfacing to act as a load-bearing surface when the paving strip is laid on a firm supporting surface.

2. A portable paving strip as claimed in claim ll, wherein the abrasion-resistant surfacing consists of a layer of aggregate.

3. A portable paving strip as claimed in claim 2, wherein the bituminous binder is a bitumen.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US293491 *Feb 12, 1884Charles BarclayHenry m
US1939004 *Nov 8, 1919Dec 12, 1933Carey Philip Mfg CoAir, moisture, and sound proof material
US2201537 *Mar 30, 1937May 21, 1940Hood Rubber Co IncLiner for separating adhesive material
US3028280 *Feb 8, 1960Apr 3, 1962Avery Adhesive Products IncBase web and protective backing web combination
US3111787 *Dec 16, 1960Nov 26, 1963Koppers Co IncSandwich roofing element
US3112681 *Aug 3, 1959Dec 3, 1963Exxon Research Engineering CoPaving with polymer-bonded aggregates
US3227604 *Apr 24, 1961Jan 4, 1966Morgan Adhesives CoNon-skid tread
US3253971 *Feb 23, 1962May 31, 1966Firestone Tire & Rubber CoProcess of producing product with a reflective surface
US3364058 *Jan 16, 1964Jan 16, 1968Selby Battersby & CoComposite floor and deck covering structure
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GB1015746A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3930100 *Jul 5, 1973Dec 30, 1975Charles H McdonaldElastomeric cold patch for pavement repair
US4074948 *May 7, 1976Feb 21, 1978Heater Jr Guy CPavement mat and process
US4113401 *Apr 4, 1977Sep 12, 1978Mcdonald Charles HMethod of pavement repair
US4141187 *Jan 28, 1977Feb 27, 1979Graves Robert JRoofing and surfacing material and method
US4684288 *Jan 22, 1986Aug 4, 1987Xavier ChapaAsphaltic pavement tiles
US4720043 *Feb 21, 1986Jan 19, 1988Clouth Gummiwerke AktiengesellschaftResilient ballast underlayment mat including nonwoven fiber fleece layers
US4813811 *Jun 23, 1987Mar 21, 1989Simulators Limited, Inc.Prefabricated pavement devices
US4963055 *Jul 31, 1989Oct 16, 1990Sims Jr EarnestPortable reinforced asphalt tile
DE2330456A1 *Jun 15, 1973Jan 3, 1974France EtatRutschfeste strassendecke, deren herstellungs- und auftragsverfahren
DE2504411A1 *Feb 3, 1975Aug 5, 1976Karl KrugReusable road surface for uneven access roads - consists of woven material for transmitting traffic imposed load to substrate
DE3631378A1 *Sep 15, 1986Mar 24, 1988Wilhelm ModzelMethod for repairing surface damage on roadways by applying prefabricated patches
DE102008061705A1 *Dec 12, 2008Apr 1, 2010Landesbetrieb Straßenbau NRWBahnenartig verlegbarer Straßenbelag und Verfahren zu seiner Herstellung und Verlegung
DE102008061705B4 *Dec 12, 2008Jan 20, 2011Landesbetrieb Straßenbau NRWBahnenartig verlegbarer Straßenbelag und Verfahren zu seiner Herstellung und Verlegung
Classifications
U.S. Classification404/35, 404/45, 428/202, 428/40.3
International ClassificationE01C5/12
Cooperative ClassificationE01C5/12
European ClassificationE01C5/12