EP0655531A1 - Pourable material, in particular liquid asphalt, with metal chips - Google Patents

Pourable material, in particular liquid asphalt, with metal chips Download PDF

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Publication number
EP0655531A1
EP0655531A1 EP94203459A EP94203459A EP0655531A1 EP 0655531 A1 EP0655531 A1 EP 0655531A1 EP 94203459 A EP94203459 A EP 94203459A EP 94203459 A EP94203459 A EP 94203459A EP 0655531 A1 EP0655531 A1 EP 0655531A1
Authority
EP
European Patent Office
Prior art keywords
chips
material according
pourable material
layer
length
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.)
Withdrawn
Application number
EP94203459A
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German (de)
French (fr)
Inventor
Alois Vilem Maria Hanusch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hollandsche Beton Groep NV
Original Assignee
Hollandsche Beton Groep NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hollandsche Beton Groep NV filed Critical Hollandsche Beton Groep NV
Publication of EP0655531A1 publication Critical patent/EP0655531A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • E01C11/16—Reinforcements
    • E01C11/165—Reinforcements particularly for bituminous or rubber- or plastic-bound pavings

Definitions

  • the invention relates to pourable material for the application of a waterproof covering layer which is suitable for foot and vehicular traffic, in particular liquid asphalt, consisting of around 90 wt.-% minerals with a certain granule distribution, in particular stone chippings, gravel, sand and filler, and at least 7% of a binder consisting essentially of bitumen.
  • a waterproof covering layer which is suitable for foot and vehicular traffic, in particular liquid asphalt, consisting of around 90 wt.-% minerals with a certain granule distribution, in particular stone chippings, gravel, sand and filler, and at least 7% of a binder consisting essentially of bitumen.
  • Liquid asphalt is in increasingly common use as a waterproof floor finish on roof car parks and walkways. It is a bituminous mortar which is processed warm and sets by cooling.
  • the correct granular structure of the minerals is important.
  • the skeleton formed by the minerals must contain the lowest possible percentage of hollow space.
  • the purpose of the filler, with a granule size of less than 63 ⁇ m, is to reduce the hollow space further, on the one hand, and to stiffen and stabilize the bitumen, on the other hand, which ensures that at higher temperatures the bitumen does not run out.
  • the acid resistance can be increased by a suitable choice of fillers.
  • the application temperature of mastic asphalt lies between 200 and 250°C and, since this temperature is much higher than the boiling point of water, liquid asphalt must be applied to a dry substrate.
  • liquid asphalt is usually poured onto a separating layer of impregnated paper, glassfibre or impregnated felt. Any vapour tension under the liquid asphalt can then become dispersed.
  • the object of the invention is to avoid these disadvantages, and to this end the pourable material mentioned in the preamble is characterized in that steel chips are incorporated in the mixture of minerals and binder in a quantity of at least 1 wt.-%, which chips are a minimum length of 10 mm and a maximum length of 80 mm, and are essentially flat in shape, the maximum breadth lying between 1 and 4 mm, and the maximum height between 0.15 and 0.5 mm.
  • the metal chips In order to achieve a substantial increase in the resistance to compression, the metal chips must be a certain minimum length and be added in a certain percentage by weight.
  • the length of the chips is preferably 20 to 40 mm, and the percentage by weight of the chips is 2 to 8.
  • the chips adhere well to the surrounding bitumen matrix.
  • the chips are preferably produced by cold-milling, are a maximum height between 0.2 and 0.3 mm, and are twisted in their lengthwise direction.
  • chips formed in this way can be mixed and homogeneously distributed without caked lumps forming.
  • one of the sides of the chips may be preferable to provide one of the sides of the chips with a wavy profile, in order to achieve good adhesion.
  • the invention also relates to a surface suitable for foot or vehicular traffic, provided with a hardened waterproof layer produced with the material according to the invention.
  • the layer is usually made up of strips which abut each other by way of seams, while according to the invention a piece of roofing felt and a reinforcement mesh are applied at the bottom surface of the layer at the position of each seam.
  • the layer can be provided with a layer of gravel on its top surface.
  • Fig. 1 shows a section through a material according to the invention which is suitable for foot and vehicular traffic and is poured onto a concrete floor.
  • Figs. 2a and 2b show two embodiments of metal chips used in said pourable material.
  • Fig. 3 shows a perspective view of a chip used in the liquid asphalt according to the invention.
  • Fig. 4 shows a graph of the relation between compression of the pourable material, chip length and percentage by weight of chips.
  • Fig. 1 shows a concrete surface 1 (for example, a roof car park), a layer of roofing felt 2, a layer of liquid asphalt 3 applied in strips, chips 4 mixed into said layer, the gravel 5 strewn onto the mastic asphalt, the seam 6 between two strips of liquid asphalt, a strip 7 of roofing felt at the position of the seam, and a reinforcement strip 8 at the position of the seam.
  • the chips are added in a quantity of 2 to 8 wt.-%.
  • Fig. 2a shows a cross-section of a first embodiment of a chip which is obtained by cold-milling.
  • the fibre is flat triangular and has a rough surface and a smooth surface (with breadth B).
  • the maximum height H is 0.15 to 0.5 mm, preferably 0.25 mm
  • the breadth B is 1 to 4 mm, preferably around 2.0 mm
  • the length is 10 to 80 mm, preferably 20 to 40 mm.
  • Fig. 2b shows a cross-section of a second embodiment of a chip; the only difference is that the top surface is wavy.
  • Fig. 3 shows that the chips are twisted and are provided with hooked or wavy ends 9.
  • the percentage by weight of steel chips and the chip length affect the resistance to compression, and thus the rutting.
  • the chips described if added in the percentage by weight of 2 to 8, can be homogeneously distributed and cannot adhere to each other in caked lumps. Moreover, the adhesion to the surrounding matrix will be excellent. If the length of the chips is less than 10 mm, adhesion to the bitumen will be inadequate. A length greater than 40 mm would lead to good adhesion, but the resistance to breaking or bending can be too low.
  • a height of less than 0.15 mm would lead to too little improvement in the resistance to compression, and too low a breadth (less than 1.0 mm) would lead to easy bending and breaking of the chips and to inadequate adhesion with the bitumen. Too great a breadth when the percentage by weight of the chips lies between 2 and 4 can lead to inadequate uniformity in the distribution, or when there is a higher percentage by weight can lead to caked lumps forming.
  • Both the twisted form of the chips and the hooked or wavy ends have a beneficial effect on the adhesion of the chips in the bitumen matrix and on the homogeneity of distribution of the chips.

Abstract

Rutting in a layer of liquid asphalt consisting of around 90 wt.-% minerals and at least 7% bitumen can be counteracted by adding metal chips to the mixture of minerals and bitumen. The percentage by weight of chips is at least 1, and preferably lies between 2 and 8. The chips are a minimum length of 10 mm and a maximum length of 80 mm, and are preferably a length between 15 and 40 mm. They are a flat shape, and the maximum breadth lies between 1 and 4 mm, while the maximum height lies between 0.15 and 0.5 mm.

Description

  • The invention relates to pourable material for the application of a waterproof covering layer which is suitable for foot and vehicular traffic, in particular liquid asphalt, consisting of around 90 wt.-% minerals with a certain granule distribution, in particular stone chippings, gravel, sand and filler, and at least 7% of a binder consisting essentially of bitumen.
  • Liquid asphalt is in increasingly common use as a waterproof floor finish on roof car parks and walkways. It is a bituminous mortar which is processed warm and sets by cooling. The correct granular structure of the minerals is important. The skeleton formed by the minerals must contain the lowest possible percentage of hollow space. The purpose of the filler, with a granule size of less than 63 µm, is to reduce the hollow space further, on the one hand, and to stiffen and stabilize the bitumen, on the other hand, which ensures that at higher temperatures the bitumen does not run out. The acid resistance can be increased by a suitable choice of fillers. The application temperature of mastic asphalt lies between 200 and 250°C and, since this temperature is much higher than the boiling point of water, liquid asphalt must be applied to a dry substrate. In order to avoid the risk of residual moisture in the substrate (often concrete), liquid asphalt is usually poured onto a separating layer of impregnated paper, glassfibre or impregnated felt. Any vapour tension under the liquid asphalt can then become dispersed.
  • It is known to apply liquid asphalt in two layers on top of one another, a mesh-type reinforcement being incorporated in the bottom layer, inter alia in order to prevent cracks forming in the top layer above the seams of the bottom layer. The seams in the top layer are replaced by a relatively broad joint filled with modified bitumen.
  • It has been found in practice that in the case of the abovementioned liquid asphalt covering formed from two layers and having a reinforcement mesh rutting occurs due to plastic deformation. Rutting can in turn lead to cracks. The resistance to compression and the tensile strength of the known liquid asphalt coverings leave something to be desired.
  • The object of the invention is to avoid these disadvantages, and to this end the pourable material mentioned in the preamble is characterized in that steel chips are incorporated in the mixture of minerals and binder in a quantity of at least 1 wt.-%, which chips are a minimum length of 10 mm and a maximum length of 80 mm, and are essentially flat in shape, the maximum breadth lying between 1 and 4 mm, and the maximum height between 0.15 and 0.5 mm.
  • The use of this material means that the reinforcement mesh can be dispensed with and a single liquid asphalt layer will suffice. This leads to savings in the application.
  • It is known per se to use steel fibres in cement concrete, in order to increase the tensile strength. It is surprising that use of the specific flat metal chips according to the invention in liquid asphalt greatly counteracts rutting through plastic deformation.
  • In order to achieve a substantial increase in the resistance to compression, the metal chips must be a certain minimum length and be added in a certain percentage by weight. The length of the chips is preferably 20 to 40 mm, and the percentage by weight of the chips is 2 to 8.
  • It is also important that the chips adhere well to the surrounding bitumen matrix. For this purpose, the chips are preferably produced by cold-milling, are a maximum height between 0.2 and 0.3 mm, and are twisted in their lengthwise direction.
  • Through this twisting in the chips and through the fact that the chips are preferably provided in a finishing operation with hooked or wavy end parts, the resistance to the chips being pulled out of the bitumen matrix is also increased. Besides, chips formed in this way can be mixed and homogeneously distributed without caked lumps forming.
  • It may be preferable to provide one of the sides of the chips with a wavy profile, in order to achieve good adhesion.
  • The invention also relates to a surface suitable for foot or vehicular traffic, provided with a hardened waterproof layer produced with the material according to the invention.
  • The layer is usually made up of strips which abut each other by way of seams, while according to the invention a piece of roofing felt and a reinforcement mesh are applied at the bottom surface of the layer at the position of each seam.
  • The layer can be provided with a layer of gravel on its top surface.
  • The invention will be explained in greater detail with reference to the figures.
  • Fig. 1 shows a section through a material according to the invention which is suitable for foot and vehicular traffic and is poured onto a concrete floor.
  • Figs. 2a and 2b show two embodiments of metal chips used in said pourable material.
  • Fig. 3 shows a perspective view of a chip used in the liquid asphalt according to the invention.
  • Fig. 4 shows a graph of the relation between compression of the pourable material, chip length and percentage by weight of chips.
  • Fig. 1 shows a concrete surface 1 (for example, a roof car park), a layer of roofing felt 2, a layer of liquid asphalt 3 applied in strips, chips 4 mixed into said layer, the gravel 5 strewn onto the mastic asphalt, the seam 6 between two strips of liquid asphalt, a strip 7 of roofing felt at the position of the seam, and a reinforcement strip 8 at the position of the seam.
  • The chips are added in a quantity of 2 to 8 wt.-%.
  • Fig. 2a shows a cross-section of a first embodiment of a chip which is obtained by cold-milling. The fibre is flat triangular and has a rough surface and a smooth surface (with breadth B). The maximum height H is 0.15 to 0.5 mm, preferably 0.25 mm, the breadth B is 1 to 4 mm, preferably around 2.0 mm, and the length is 10 to 80 mm, preferably 20 to 40 mm.
  • Fig. 2b shows a cross-section of a second embodiment of a chip; the only difference is that the top surface is wavy.
  • Fig. 3 shows that the chips are twisted and are provided with hooked or wavy ends 9.
  • As can be seen from Fig. 4, the percentage by weight of steel chips and the chip length affect the resistance to compression, and thus the rutting.
  • The chips described, if added in the percentage by weight of 2 to 8, can be homogeneously distributed and cannot adhere to each other in caked lumps. Moreover, the adhesion to the surrounding matrix will be excellent. If the length of the chips is less than 10 mm, adhesion to the bitumen will be inadequate. A length greater than 40 mm would lead to good adhesion, but the resistance to breaking or bending can be too low.
  • A height of less than 0.15 mm would lead to too little improvement in the resistance to compression, and too low a breadth (less than 1.0 mm) would lead to easy bending and breaking of the chips and to inadequate adhesion with the bitumen. Too great a breadth when the percentage by weight of the chips lies between 2 and 4 can lead to inadequate uniformity in the distribution, or when there is a higher percentage by weight can lead to caked lumps forming.
  • Both the twisted form of the chips and the hooked or wavy ends have a beneficial effect on the adhesion of the chips in the bitumen matrix and on the homogeneity of distribution of the chips.

Claims (12)

  1. Pourable material for the application of a waterproof covering layer which is suitable for foot and vehicular traffic, in particular liquid asphalt, consisting of:
    - around 90 wt.-% minerals with a certain granule distribution, in particular stone chippings, gravel, sand and filler, and
    - at least 7% of a binder consisting essentially of bitumen,
    characterized in that metal chips are incorporated in the mixture of minerals and binder in a quantity of at least 1 wt.-%, which chips are a minimum length of 10 mm and a maximum length of 80 mm, and are essentially flat in shape, the maximum breadth lying between 1 and 4 mm, and the maximum height between 0.15 and 0.5 mm.
  2. Pourable material according to Claim 1, characterized in that the chips are of steel.
  3. Pourable material according to Claim 1 or 2, characterized in that the length of the chips is 15 to 40 mm.
  4. Pourable material according to one of the preceding claims, characterized in that the percentage by weight of chips is 2 to 8.
  5. Pourable material according to one of the preceding claims, characterized in that the chips are produced by cold-milling.
  6. Pourable material according to one of the preceding claims, characterized in that the chips have a maximum height (thickness) between 0.2 and 0.3 mm.
  7. Pourable material according to one of the preceding claims, characterized in that the chips are twisted in their lengthwise direction.
  8. Pourable material according to one of the preceding claims, characterized in that the chips are provided in a finishing operation with hooked or wavy end parts.
  9. Pourable material according to one of the preceding claims, characterized in that one of the sides of the chips is provided with a wavy profile.
  10. Surface suitable for foot or vehicular traffic, provided with a hardened waterproof layer produced with the material according to one of the preceding claims.
  11. Surface according to Claim 10, in which the layer is made of various strips which abut each other by way of seams, characterized in that a piece of roofing felt and a reinforcement mesh are applied at the bottom surface of the layer at the position of each seam.
  12. Surface according to Claim 10 or 11, characterized in that the layer is provided with a layer of gravel on its top surface.
EP94203459A 1993-11-30 1994-11-29 Pourable material, in particular liquid asphalt, with metal chips Withdrawn EP0655531A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9302074 1993-11-30
NL9302074A NL9302074A (en) 1993-11-30 1993-11-30 Pourable material, in particular mastic asphalt, with metal chips.

Publications (1)

Publication Number Publication Date
EP0655531A1 true EP0655531A1 (en) 1995-05-31

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EP94203459A Withdrawn EP0655531A1 (en) 1993-11-30 1994-11-29 Pourable material, in particular liquid asphalt, with metal chips

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EP (1) EP0655531A1 (en)
NL (1) NL9302074A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998035100A1 (en) * 1997-02-07 1998-08-13 N.V. Bekaert S.A. Reinforcing mat for reinforcing asphalt
ES2654425A1 (en) * 2016-08-12 2018-02-13 Universidad De Granada PAVEMENT, AND SECURITY SYSTEM THAT UNDERSTAND IT (Machine-translation by Google Translate, not legally binding)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7217613A (en) * 1972-12-22 1974-06-25
WO1980001179A1 (en) * 1978-12-06 1980-06-12 Kibag Ag Process for manufacturing asphaltic coating,coating and mixture to be heated for applying such process
EP0229416A1 (en) * 1985-12-30 1987-07-22 N.V. Bekaert S.A. Reinforcing member for cementitious material
DE9006524U1 (en) * 1990-06-09 1990-08-09 Hermann Gloerfeld Gmbh & Co Kg, 5860 Iserlohn, De
DE3930599A1 (en) * 1989-09-13 1991-04-04 Strabag Bau Ag Cast asphalt for heavy duty traffic surfaces - contains reinforcing fibres esp. of polyacrylonitrile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7217613A (en) * 1972-12-22 1974-06-25
WO1980001179A1 (en) * 1978-12-06 1980-06-12 Kibag Ag Process for manufacturing asphaltic coating,coating and mixture to be heated for applying such process
EP0229416A1 (en) * 1985-12-30 1987-07-22 N.V. Bekaert S.A. Reinforcing member for cementitious material
DE3930599A1 (en) * 1989-09-13 1991-04-04 Strabag Bau Ag Cast asphalt for heavy duty traffic surfaces - contains reinforcing fibres esp. of polyacrylonitrile
DE9006524U1 (en) * 1990-06-09 1990-08-09 Hermann Gloerfeld Gmbh & Co Kg, 5860 Iserlohn, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HAACK,EMIG: "PARKDECKABDICHTUNGEN MIT BITUMENWERKSTOFFEN", BITUMEN., vol. 51, no. 4, 1989, HAMBURG DE, pages 162 - 171, XP000084736 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998035100A1 (en) * 1997-02-07 1998-08-13 N.V. Bekaert S.A. Reinforcing mat for reinforcing asphalt
BE1010910A3 (en) * 1997-02-07 1999-03-02 Bekaert Sa Nv Reinforcing mesh FOR STRENGTHENING OF ASPHALT.
US6168118B1 (en) 1997-02-07 2001-01-02 N.V. Bekaert S.A. Reinforcing mat for reinforcing asphalt
ES2654425A1 (en) * 2016-08-12 2018-02-13 Universidad De Granada PAVEMENT, AND SECURITY SYSTEM THAT UNDERSTAND IT (Machine-translation by Google Translate, not legally binding)

Also Published As

Publication number Publication date
NL9302074A (en) 1995-06-16

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