Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
  • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
  • E04D5/02—Roof covering by making use of flexible material, e.g. supplied in roll form of materials impregnated with sealing substances, e.g. roofing felt
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N5/00—Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch

Definitions

• the present invention relates to bituminous compositions and to the sheets obtained from these compositions, intended in particular for forming waterproof coatings on engineering structures or buildings.
• certain inventions have consisted in replacing the first layer of poured asphalt with a layer of bituminous sheets.
• a continuous screen impermeable to liquid bitumen such as, for example, a metal sheet or based on a synthetic material to prevent the bituminous composition of the layer in sheets does not mix with the mass of asphalt by fusion caused by the addition of heat during the cooling of the mass of hot asphalt.
• This screen can be incorporated into the upper surface of the sheet at the time of manufacture of the latter or, placed on the lower layer when the coating is produced.
• the disadvantage of this screen is threefold. Indeed, it can create a cleavage plane between the lower layer and the asphalt and in case of injury, this screen no longer fulfills its role. Finally, it is expensive.
• bituminous masses or compositions currently used in sheet-based waterproofing coatings cannot be used under hot asphalt, that is to say freshly poured asphalt, without migration to the within the latter.
• These are in particular direct distillation bitumens, oxidized bitumens, possibly supplemented with inert fillers (limestone filler for example), direct distillation bitumens modified with additives for example, styrene-butadiene-styrene copolymer (SBS) or polypropylene atactic (PPA) whose densities which vary from 0.96 to 1.35 remain relatively low and / or whose appreciable viscosities according to their drop point, measured in accordance with standard NFT 60102, are less than approximately 120 ° C.
• SBS styrene-butadiene-styrene copolymer
• PPA polypropylene atactic
• the subject of the invention is also a sealing coating, in particular for engineering structures or buildings, characterized in that it comprises at least one sealing sheet as defined above, disposed on the surface to be protected and an asphalt layer, optionally comprising fillers or additives, disposed on said sheet.
• bituminous sheet of the invention For the choice of the above-mentioned criteria of the bituminous sheet of the invention, one must take into consideration the temperature of pouring of the asphalt intended to form the upper layer of a coating of which said sheet constitutes the lower layer.
• the pouring temperature of the asphalt forming the upper layer of the coating is much higher than 240 ° C.
• the temperature to which the bituminous composition of the sheet of the lower layer will be brought will be such that for to guard against any migration of this composition into the asphalt, it will be necessary to use a sheet which meets either two of the three aforementioned criteria but in which the density of the composition is much greater than 1.35 approximately or in the point drop measured according to standard NFT 60102 is much higher than approximately 120 ° C., that is to say and preferably, to the three criteria at the same time.
• bituminous composition has a drop point of between 125 and 170 ° C approximately and / or a density of between 1.35 and 2 approximately.
• the bituminous composition has a drop point of approximately 140 ° C and / or a density of approximately 2.
• the bituminous composition is obtained by dispersing a maximum percentage, by volume in the final bituminous composition, of approximately 40 of mineral filler in a bitumen conventional in the technique of such coatings and in particular a bitumen oxidized or modified by additives.
• the content of filler in the composition is linked to the nature of the bituminous binder and the very density of this filler.
• the particle size of this charge will be less than 400 microns and, preferably, less than 100 microns.
• the volume charge rate in the composition is at least 25%, with a charge density close to 2.5 such as, for example, a calcareous material, a silica-limestone mixture, fly ash or slate powder.
• a charge density close to 2.5 such as, for example, a calcareous material, a silica-limestone mixture, fly ash or slate powder.
• this volume percentage in the bituminous composition can be significantly lowered.
• the minimum percentage is around 10.
• the loading rate varies according to the nature and the quantity of these additives.
• the additives advantageously used are, for example, a styrene-butadiene-styrene copolymer - (SBS) in amounts ranging from 0.5 to 20% by weight approximately relative to the final composition depending on the type of bitumen, that is to say ie direct distillation bitumen, oxidized bitumen or a mixture of the two; polypropylene in amounts varying from 1 to 40% by weight relative to the final composition depending on the type of bitumen; olefin copolymers such as those mentioned in French Patent No. 78 26 336 of the Applicant.
• SBS styrene-butadiene-styrene copolymer -
• bitumen modified with 1% by weight of SBS will be added with loads of density close to 2.5 at a minimum rate of 20% by volume in the bituminous composition.
• this same modified bitumen will be added with charges of density close to 4.3 at a minimum rate of 5% by volume.
• Such a screen adapted to be placed on the face of the sheet intended to be oriented towards the upper asphalt layer of the waterproofing coating, can be made of non-woven fabric based on glass fibers, for example, a veil of glass of 50 g per m2, in non-woven fabric based on synthetic fibers such as, for example, polyester or polyamide. They can likewise be produced from fine-knit fabric with materials similar to those mentioned above or by a combination of non-woven fabrics and fabrics themselves.
• the diameter of the threads or fibers of the screen used that is to say the threads or fibers which, according to the case, delimit the meshes or the pores of the screen, must preferably be at most equal to one mm, the mass per m2 of this screen or grammage not exceeding 500 g.
• the screen arranged on the bituminous sheet can, moreover, play the role of reinforcement in a reinforced bituminous sheet, but the sheets of the invention can, in the presence or not of this screen, include one or more reinforcements on at least one face. of which or each of which, the bituminous composition is deposited.
• the reinforcements that can be used in the manufacture of sealing sheets comprise, in a manner known per se, reinforcements made of cardboard, felt, glass or jute cloth, glass veil or metal.
• Non-woven fabrics of synthetic material such as, for example, polyester or synthetic fiber fabrics, for example, of polyester or polyamide having a mass per m2 or grammage of between 50 and 500 g approximately, may also be employees.
• the sheet can receive on one side, either a finish with mineral granules or slate flakes bonded to the heated bituminous composition, or a metallic sheet, initially having a particular design conferring on the sheet of sealing its thermostable properties, ie a sheet of kraft paper, etc.
• a sheet of kraft paper ie a sheet of kraft paper, etc.
• sealing sheets for example, based on canvas or glass veil, in the form of a sheet having a thickness ranging from 1 to 6 mm approximately, sanded on both sides or coated on a single side by a metallic foil or by mineral granules.
• This sheet or the overlaps of two sheets are easily welded with a torch and can be used for making sealing statements or acting as components of a sealing complex.
• the latter may be placed on the sheet after it has been placed on a surface to be protected or else, fixed, for example, by thermo-adhesiveness at the time of manufacture of the sheet.
• a bituminous sheet 2 mm thick is prepared, presented in strips of 10 mx 1 m, comprising on the surface (upper face in a coating) a non-stick sanding, on the underside (lower face in a coating) a sheet of creped kraft paper, at mid-thickness a glass fabric frame of 50 g / m2 and whose bituminous composition has the following characteristics:
• bituminous sheet is prepared, presented in strips of 15 mx 1 m, comprising on the surface a slightly permeable screen consisting of a glass veil of 60 g / m2, on the underside a non-stick sandblasting and whose bituminous composition has the following characteristics:
• a bituminous sheet 3 mm thick is prepared, presented in strips of 15 mx 1 m, comprising on the surface a slightly permeable screen consisting of a glass veil of 50 g / m2, on the underside a non-stick coating and whose bituminous composition has the following characteristics:
• a bituminous sheet 2.5 mm thick is prepared, presented in strips of 8 mx 1 m, comprising on the surface a slightly permeable screen made of a polyester nonwoven of 130 g / m2, on the underside a polypropylene film. 10 g / m2 and whose bituminous composition has the following characteristics:

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Textile Engineering (AREA)
• Laminated Bodies (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
• Liquid Crystal (AREA)
• Sealing Material Composition (AREA)
• Packaging For Recording Disks (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9318693

Family Applications (1)

Country Status (5)

Cited By (1)

Citations (4)

• 1985
  • 1985-04-25 FR FR8506346A patent/FR2580990B1/fr not_active Expired
• 1986
  • 1986-04-11 DE DE8686400786T patent/DE3662062D1/de not_active Expired
  • 1986-04-11 EP EP19860400786 patent/EP0202971B1/de not_active Expired
  • 1986-04-23 DK DK187086A patent/DK160515C/da not_active IP Right Cessation
  • 1986-04-25 NO NO861642A patent/NO166092C/no unknown

Patent Citations (4)

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