FR2674549A1 - A TRAFFIC TAPE USUALLY NOT SUBJECT TO TRAFFIC, SUCH AS AN EMERGENCY STOP STRIP. - Google Patents

Abstract

The hard shoulder or other road lane, which is usually not subjected to traffic, comprises a draining main surfacing made of draining surfacing material or porous concrete; the said surfacing is covered by a secondary layer made of a material which is impervious to the residual matter, which material is intended to protect the said lane so that its main surfacing does not become clogged up by the residual matter which settles thereon.

Description

The present invention relates particularly to stop bands

  emergency, which are provided, for example, on the side edges of multi-lane roads or highways and more generally to the road strips usually not subject to vehicle traffic. More particularly still, the invention relates to pavement strips of this type, which are produced in a

  draining coating, such as a draining mix.

  A draining mix is an aggregate-bitumen mixture which

  has a void percentage generally greater than 20%.

  Draining asphalts are experiencing a strong development as a wearing course on high traffic roads, in particular on highways, urban bypasses,

  complementary development links of the motorway network.

  The benefit of such an open covering is threefold. It ensures: driving comfort and safety in rainy weather, by eliminating in particular water splashes at the rear of vehicles and by improving the visibility of road markings, reduction of road noise,

grip at high speed.

  When a roadway is coated with draining asphalt, to allow the transverse flow of water from the tracks to the outlets, the emergency stop strip is also

coated in the same way.

  After commissioning, many allochthonous materials (atmospheric dust, cigarettes, metallic debris, tire rubber, residues from the treatment of

  pavement) settle on the pavement.

  These residues are gradually displaced by traffic, in particular towards the emergency stop lane. This is not or very little subject to traffic, the residues which deposit there, remain there, and, little by little, penetrate by gravity into the body of the draining coating, thereby clogging

effective voids.

  After a certain time, the first centimeters of the emergency stop strip are completely blocked. The water coming from the traffic lanes can no longer be evacuated and it spurts at the edge of the stop strip d To date, mechanical attempts at in situ treatment, without milling the clogged coating, have failed.

  example, the use of sweeper-type equipment

  vacuum cleaners which are now recognized for their preventive and non-curative interest By cons, the use of such devices near heavy traffic flows

is dangerous.

  The object of the present invention is to provide a more effective and safer solution for preventing the surface clogging of emergency stop strips in draining asphalt. According to the invention, a secondary layer of a material is applied to said strips. formulation meets exactly the specifications set by the managers of high traffic roads, in particular: no modification of the drainage qualities of the asphalt mixes of the emergency stop band, possibility of occasionally circulating on the stop band emergency in complete safety (adhesion to the support and surface roughness), no reduction in the structural quality of the emergency stop strip, no excess thickness detrimental to the safety of

users.

  The subject of the present invention is therefore an emergency stop strip or other strip of roadway usually subject to traffic, comprising a main coating draining in porous concrete or porous concrete, characterized in that said coating is covered by a secondary layer. made of a material impervious to residues of a reconstituted particle size, intended to protect said strip against clogging of its main coating by

residues deposited there.

  Advantageously, the material in which the secondary layer is produced is a cold bituminous grout. The bituminous grout of the secondary layer can comprise a mixture of aggregates of a bitumen emulsion, filler water and regulatory additives. be of reconstituted particle size of 0/4, 0/5 or 0/6 caliber A bitumen emulsion can be produced from a bitumen of grade greater than or equal to 40/50, the bitumen content of which is greater than 55% The thickness of this secondary layer can vary between 0.4 and 1.5 cm approximately. The setting regulating additives may include thickeners, shear-thinners or viscosants, or any other similar product. The setting regulating additives can also

understand an accelerator.

  Preferably, the layer of bituminous concrete, with which it is at least partially covered, is cold cast and has the following composition by weight: aggregates 100% bitumen emulsion 12 to 14% of the dry weight of aggregates wetting water 8 to 15% of the weight of thickening aggregates 0.1 to 1.5% relative to the weight of the accelerator emulsion 0.1 to 1.5% by dry weight of aggregates The secondary layer is advantageously applied with

a density of 12 to 20 kg / m 2.

  Also again, the material in which the secondary layer is made can be bituminous concrete poured at

  hot or coated sand or road carpet.

  The height between the upper surface of the secondary layer and the upper surface of the coating of the part

  circulating is preferably less than i cm.

  The surface of the secondary layer may be at the same level on the surface of the coating of the circulated part of

pavement.

  The subject of the invention is also the use of a cold bituminous grout to produce, on an emergency stop strip or any other strip not usually subjected to the movement of a roadway, a layer protection against clogging by residues which

settle there.

  The following description of several modes of

  realization of the invention is purely illustrative and not

limiting.

  The basic road surfacing used according to the invention is produced in a conventional manner in a draining asphalt or porous concrete. The composition of such a draining asphalt or porous concrete is perfectly known to those skilled in the art. The same is true for the means to be used for the production of pavements from these materials, reference may be made in this regard to the information note of the

SETRA dated December 13, 1990.

  According to the invention, the emergency stop strip made from such a draining coating is coated with a secondary layer of poured bituminous concrete. This poured bituminous concrete can be a hot-poured bituminous mortar, in particular based on of polymer bitumen, or a grout

bituminous when cold.

  The composition of a hot-poured bituminous mortar is for example: crushed gravel 10% sand 60% filler 30% polymer bitumen 15% However, preferably a cold bituminous grout is used. Such a cold bituminous grout is a homogeneous mixture of fillered sand , gravel,

  emulsion, water and setting regulators.

  It is applied in a thin layer of 12 to 20 kg / m 2 Le

  dosage chosen depends on the caliber selected and the traffic.

  An example of the composition by weight is as follows: aggregates 100% of dry materials emulsion 13% relative to the dry weight of aggregates wetting water 10% relative to the dry weight of thickening aggregates 1% relative to the accelerator emulsion 0.5 % relative to the aggregates The aggregates are first introduced successively, then the filler water and finally the emulsion The mineral additions are made in the aggregates and the liquid additions in the filler water. Such a sealant has limited penetration into the draining asphalt (5 mm). Its applied surface state is fairly rough.

  in addition good adhesion to the support.

  In still other examples, the dosage of the emulsion varies between 12 and 14% by dry weight of aggregates, the wetting water varies between 8 and 15% by dry weight of aggregates, the setting accelerator varies from 0 , 1 to 1.5% by dry weight of aggregates, thickening it between 0.1 and 1.5% by weight of emulsion. This thickener is essentially in liquid form. It is intended to freeze the grout but does not thicken the emulsion. It is added either in the filler water or in the emulsion. It may also advantageously be used for

  replace it with shear thinners or viscosants.

  The emulsion can be of several types It can be a bitumen emulsion produced from an 80/100 bitumen with a content greater than 60% It can also be an elastomeric emulsion obtained by the incorporation of a latex in the

aqueous phase of the emulsion.

  The accelerator can be in solid form (cement,

  slaked lime, quicklime) or in liquid form.

  The reconstituted aggregates are preferably of size 0/4, 0/5 or 0/6 For a bituminous grout 0/4, the particle size components will be between 95% and 100% at

  4 mm, 35% to 40% to 2 mm and 6% to 9% for 0.08 mm.

  The grout is implemented by means of a specific compact machine which includes the aggregate hoppers, the emulsion tank, the water tanks and various additives, a

  continuous mixer and applicator sled.

  The secondary layer of the emergency stop strip may also be made of coated sand 0/3, 0/4,

  0/5 or 0/6 with or without an elastomer binder.

  To make it rougher in its surface appearance

  or can proceed to a studding thereof.

  The application of this coated sand is done with conventional road application equipment.

  application, it can be compacted with a smooth cylinder.

  Also, the secondary layer could be a road carpet sticking directly to the main covering.

Claims (12)

  1 Emergency stop strip or other strip of roadway usually not subject to traffic, comprising a main coating draining in asphalt draining or porous concrete, characterized in that said coating is covered by a secondary layer of a material impermeable to residues , intended to protect said strip against clogging of its   main coating by the residues which deposit there.   2 pavement strip according to claim 1, characterized in that the material from which the   secondary layer is a cold bituminous grout.   3 pavement strip according to claim 2, characterized in that the bituminous grout of the secondary layer comprises a mixture of aggregates, an emulsion of   bitumen, filler water and regulating additives.   4 pavement strip according to claim 3, characterized in that the aggregates are of a particle size   reconstituted of caliber 0/4, 0/5 or 0/6.   Road strip according to claim 4, characterized in that the thickness of a secondary layer is between 0.4 and 1.5 cm.   6 Pavement strip according to any one of   Claims 3 to 5, characterized in that the emulsion of   bitumen is produced from a higher grade bitumen or   equal to 40/50, the bitumen content of which is greater than 55%.   7 Pavement strip according to any one of   Claims 3 to 6, characterized in that the additives   tap regulators include thickeners,   rheofluidifiers or viscosants.   8 Pavement strip according to any one of the   Claims 3 to 7, characterized in that the additives   tap regulators include an accelerator.   9 pavement strip according to one of claims 7   or 8, characterized in that the layer of bituminous concrete with which it is at least partially covered is cold cast and has the following composition by weight: aggregates 100% bitumen emulsion 12 to 14% of the dry weight of aggregates wetting water 8 to 15% of the weight of thickening aggregates 0.1 to 1.5% relative to the weight of the accelerator emulsion 0.1 to 1.5% by dry weight of aggregates Pavement strip according to any one of the   claims 2 to 9, characterized in that the layer   secondary is applied with a density of 12 to 20 kg / m 2.   11 Pavement strip according to claim 1, characterized in that the material in which the secondary layer is made is a hot-poured bituminous concrete or a   coated sand or road carpet.   12 Pavement strip according to any one of   previous claims, characterized in that the height   between the upper surface of the secondary layer and the upper surface of the coating of the circulating part is less than 1 cm.   13 pavement strip according to claim 12, characterized in that the upper surface of the secondary layer is at the same level as the upper surface of the   coating of the circulating part of the roadway.   14 Use of a cold bituminous grout to produce, on an emergency stop strip or any other strip not normally subject to traffic, a pavement in a draining coating, a layer of protection against   clogging by residues deposited there.