FR2719855A1 - Walkable surfaces for pedestrians and vehicles. - Google Patents

Abstract

Walkable covering for pedestrians and vehicles for cement bonded base layer, based on hardened reactive resin, possibly with a content of mineral fillers and other constituents. The coating includes elastomeric particles having a particle size of 0.3 to 2 mm.

Description

Practical coatings for pedestrians and vehicles The present invention has

  subject for a practicable coating for pedestrians 1 0 and vehicles, usable in particular for base layers bonded by cement, based on hardened reactive resins, possibly having a content of

  mineral fillers and other constituents.

  Freely spreading, loaded and pigmented coating materials are used for pavements, passable surfaces for pedestrians and vehicles, such as on bridges, parking lots, storage sheds, sidewalks and the like. most often with base layers bonded by cement, for protection against mechanical and chemical stresses, such as abrasion, wear, salting, gasoline, engine oil, acids and weathering . Reactive resins, for example epoxy resins, optionally made elastic with polyurethane, polyurethanes, unsaturated polyester resins or poly (methyl methacrylate) resins, are used here as a binder. These cold-hardenable coatings, most often two-component, contain, to increase mechanical strength, mineral fillers which are often incorporated only at the place of use. In addition, after application of the coating, a spreading material is spread over the surface thereof. As filler and as spreading material, quartz sand is generally used having

  different particle size distributions.

  Coatings of this type are subject to considerable stresses.

  In addition to adhesion, low moisture absorption and thermal resistance, they must, on the one hand, have high abrasion resistance as well as good resistance to chemicals, and on the other hand, a good ability to cover cracks even under dynamic conditions. Thus, the coatings used in works which are placed under the responsibility of the Federal Ministry of Traffic or the inspection of

  Public works must meet particularly strict requirements.

  These are set out in the framework of the "Additional technical contract conditions 1 0" (ZTV-SIB 90) or in the Directives for the Protection and Maintenance of concrete constructions and also in the "Conditions

delivery techniques ".

  Particularly difficult conditions to be fulfilled simultaneously are the low abrasion (= high hardness) and the good capacity to cover the cracks 1 5 under static and / or dynamic conditions (= high elasticity), because these

  characteristics are antagonistic and mutually exclusive.

  As a result, coatings of this type are most often applied in two coats. The first layer, soft, uncharged, has the function of covering the cracks. The second layer loaded with quartz sand, on which we mainly spread, after its application, but in the state where it is still capable of bonding, sand serving at least in part also as a filler, ensures the high abrasion resistance of the overall coating. Conventional two-layer systems generally consist of an intermediate or light layer of uncharged reactive resin, and a cover layer of charged reactive resin. In these two-layer coatings, the binder of each layer can be optimally adjusted according to the given conditions. Thus, the elasticity of the soft, unloaded light layer is adjusted to such a value that a capacity to cover cracks under dynamic conditions is ensured even at -20 C. The covering layer loaded with sand , harder, also has resistance

  high abrasion and chemicals desired.

  However, in the case of monolayer coatings, the binder must meet both types of requirements. Thus, the elasticity of the binder must be adjusted to a value such that, at -20 ° C., a capacity to cover cracks under sufficient dynamic conditions, for example 0.3 mm, is ensured. Soft binders of this type already have the disadvantage of low abrasion resistance in themselves. To this is added that the fixing of the scattered sand is only carried out to a small extent, which again goes against abrasion resistance. If one adjusts the binder to a harder consistency, one encounters problems concerning the capacity to cover cracks under dynamic conditions, resulting in cracks on the surface. Consequently, epoxy resins modified for example with polyurethane, loaded with sand, are not suitable as a binder, since these materials do not have sufficient elasticity at -20 C. The quartz sands usually used, which are used both as a filler and for sandblasting, are actually necessary to achieve a high resistance to

  abrasion, but they decrease the elasticity of the final coating.

  It has now been surprisingly discovered that coatings based on reactive resin, in particular based on epoxy resin modified optionally with polyurethane, exhibit, as a result of the incorporation of elastomeric granules, an ability to cover cracks clearly. improved, which is preserved even in the presence of fillers and mineral spreading agents increasing the resistance to abrasion. Consequently, the subject of the present invention is a practicable coating for pedestrians and vehicles, for a base layer bonded by cement, based on hardened reactive resins, possibly having a content of mineral fillers and other constituents, the coating comprising, in accordance with the invention, elastomeric particles having a particle size of 0.3 to 2 mm. The preferred binders are epoxy resins, in particular modified with polyurethanes. Other examples of binders which can advantageously be used are polyurethanes, resins

  unsaturated polyester and poly (methyl methacrylate) resins.

  The invention makes it possible to replace the labor-intensive two-layer system necessary for coating the usual base layers bonded with cement, without having to take into account the drawbacks inherent in prior monolayer systems. The coating according to the invention rather has the characteristics in themselves contradictory of a resistance to abrasion and a high stability to chemicals as well as a great capacity to cover cracks, to a completely satisfactory extent. Of course, the coating according to the invention can also be used in bilayer systems, to improve the ability to cover cracks, while retaining high abrasion resistance and stability to chemicals. To this end, the elastomeric granule can be contained in one or both of the layers. At least the outer face of the layer furthest from the base layer is filled here with quartz spreading sand, to increase the abrasion resistance, while the two layers can also have compositions

1 0 identical.

  The coating according to the invention preferably contains elastomeric particles having a particle size of 0.4 to 1.8, in particular 0.5 to 1.5 mm. As elastomeric particles, i.e., elastomeric granules, use may be made of natural or synthetic elastomers, such as, for example, natural or synthetic rubber, gum, EPDM, regenerated materials ( for example industry recycling products

tires and others).

  It is particularly advantageous to concentrate the elastomeric particles in the coating layer according to the invention, close to the

base layer bonded by cement.

  A weight ratio of the binder to the granules of 2: 1 to 10: 1, in

  especially from 2: 1 to 7: 1, has proven to be the most advantageous.

  The coating according to the invention contains, as a binder, cured reactive resins, for example polyurethane resins, unsaturated polyester resins and / or poly (methyl methacrylate) resins. Particularly preferred are the epoxides, optionally also modified, in particular based on epoxy resins based on bisphenol A and / or bisphenol F, optionally modified, for example with blocked aromatic isocyanates, which have been reacted with cycloaliphatic, araliphatic and / or aliphatic amines. Epoxy resins can contain reactive aromatic or aliphatic diluents. Epoxy binders, which are made elastic by means of polyurethanes, preferably contain for this purpose

  blocked polyurethane prepolymers, based on polyether polyols.

  The coatings according to the invention may contain, in addition to fillers and spreading agents, other constituents known per se, such as pigments, accelerators, stabilizers, agents for adjusting the

  viscosity, solvents, especially reactive solvents, and the like.

  To prepare the coating according to the invention, the coating material is preferably applied first in the liquid state, containing the reactive resin, preferably an epoxy resin, as a binder, and elastomeric particles, on the layer. base bonded with cement, possibly pre-impregnated and, preferably, after the sedimentation of the elastomeric particles is almost complete, and before the binder has hardened, the agent increasing the abrasion resistance is optionally spread, but

  also playing the role of charge.

  From experience, when using the binder, sufficient preferred sedimentation of the elastomeric particles, occurring under the effect of gravity, takes place after about 20 to 60 minutes, so that the spreading, by example of quartz sand, can then be produced. This particular procedure has the advantage that the elastomeric particles concentrated in the area of the coating close to the base layer are weighed down by the

partially deposited spread.

  The invention will be better understood using the following example.

Example

  As a binder, a mixture consisting of: Bisphenol A epoxy resin 13% by weight blocked PUR prepolymer (polyether-polyol) 44% by weight 2 5 Red iron oxide pigment 2.5% by weight Filler (powder of powder) quarz, chalk) 25% by weight Aeration agent 0.5% by weight Polyamine hardener (activity index H 135) 15% by weight The binder is mixed with a colored EPDM granule, having a particle size of 0.5 to 1.5 mm, and it is applied to concrete as a base layer and on which quartz sand has been spread. The coating incorporates, after approximately 30 minutes, quartz sand having an average particle size of 0.7 to 1.2 mm. After hardening, the coating thus obtained meets the conditions of TL / TP-OS, point 6.15 (capacity to cover cracks in

dynamic conditions IIT + V).

  Particle size data refer to a series of screens, i.e. all particle sizes between the indicated limits can be contained individually. A particle size distribution according to a bell-shaped Gaussian curve, with an average size

  particle in the range indicated, is also acceptable.

  The coating according to the invention meets the requirements of ZTV-SIB 90.

  By comparison with a coating other than that of the invention, the following results are obtained Example Comparative example Binder 100 100

  Synthetic granule 0.5-1.5 mm 25 -

  Quartz sand, 0 0.7-1.2 mm (sand of 50 75 spreading) Moment of spreading: after a period of ... 30 30 (minutes) Abrasion test, n. TL / TP-OS of ZTV-SIB 90 satisfactory satisfactory Test of the capacity to cover cracks, satisfactory no n. ZTV-SIB 90 TL / TP-OS satisfactory

Claims (10)

  1. Practical coating for pedestrians and vehicles for cement-bonded base layer, based on hardened reactive resin, optionally having a content of mineral fillers and other constituents, characterized in that the coating comprises elastomer particles having a size of particle of 0.3 to 2 mm.   2. Coating according to claim 1, characterized in that it contains particles having a particle size of 0.4 to 1.8, in particular 0.5 to 1.5 mm.   1 0 3. Coating according to claim 1 or 2, characterized in that the elastomeric particles, in particular granules, include rubber synthetic and / or natural.   4. Coating according to any one of the preceding claims,   characterized in that the weight ratio of the binder to the granules is within the   range from 2: 1 to 10: 1, in particular from 2: 1 to 7: 1.   5. Coating according to any one of the preceding claims,   characterized in that the elastomeric particles are concentrated in the   coating area close to the base layer.   6. Method for preparing a coating according to any one of   2 0 previous claims, comprising the steps of applying a   liquid layering mass, comprising a curable reactive resin, on a base layer bonded with cement, possibly prepreg, and to be hardened, characterized in that the applied layering mass comprises elastomer particles having a particle size of 0.3 at 2 mm, in   2 particular from 0.4 to 1.8 and preferably from 0.5 to 1.5 mm.   7. Method according to claim 6, characterized in that the elastomeric particles are concentrated in the area of the coating close to the layer base bound by cement.   8. Method according to claim 7, characterized in that the concentration is carried out under the effect of gravity before the coating hardens.   9. Method according to any one of claims 6 to 8, characterized by   the fact that it comprises a step consisting in incorporating into the coating, or in spreading thereon, before the coating hardens, a filler and / or a   spreading material increasing resistance to abrasion.   10. Method according to any one of claims 6 to 9, characterized by   the fact that the spreading material is only applied after concentration   1 0 elastomeric particles in the area close to the base layer.