DK3077595T3

DK3077595T3 - SURFACE AND PROCEDURE FOR ITS MANUFACTURING

Info

Publication number: DK3077595T3
Application number: DK14806539.4T
Authority: DK
Inventors: Stephan Steffen
Original assignee: Sf Kooperation Gmbh Beton Konzepte
Priority date: 2013-12-02
Filing date: 2014-11-27
Publication date: 2019-01-28
Also published as: DE102013113318A1; WO2015082058A1; EP3077595B1; EP3077595A1

Description

Ground cover and method for producing the same

Description

The invention relates to a ground covering according to the preamble of Claim 1.

The invention further relates to a method for producing such a ground covering according to the preamble of Claim 7.

The invention is concerned with the creation of paved areas as surfacing or as top course of a traffic area in road and path construction. The paved area consists of the actual paving blocks which are laid in a pavement bed and of the base course situated below. Instead of paving blocks, it is also possible to use paving slabs. Besides natural stones, artificial shaped blocks can also be considered for the top course, for example concrete blocks, clinker or the like.

With regard to the construction of the ground covering, a distinction is made between the “bound mode of construction” and the “non-bound mode of construction”. In the case of the non-bound mode of construction, the shaped blocks are placed on a loose bed of grit, sand or granular material. The regions between the shaped blocks, that is to say the joints, are filled with a joint material. This entire construction reacts to static or dynamic loading with elastic deformation. Temperature stresses are dissipated by unimpeded deformation, with the result that no constraining forces occur. The paved surface remains fundamentally water-permeable.

In the case of the bound mode of construction, the paving bed and the joints consist, for example, of a cement mortar. The disadvantage of this mode of construction is the risk of damage caused by deformations of the ground covering. However, the paved surface in this case is virtually water-impermeable.

The closest prior art is considered to be DE 696 27 642 T2. Disclosed therein is a method for constructing a stone or block paving in which a cement-asphalt mortar is used. The cement-asphalt mortar (CA mortar) comprises an asphalt emulsion which can contain a polymer. In addition, the CA mortar can contain silica sand. In the method described in the document, paving blocks are arranged on a prepared layer of granules and then a cement-asphalt mortar is poured into the interspaces of the paving blocks. Since the CA mortar is pourable and free-flowing, it can flow at least partially through the interspaces of the paving blocks into the underlying layer of granules or into interspaces of the individual granular particles (Fig. 8). In this way, the CA mortar forms, together with the granules, a type of paving bed similar to that of the present invention. However, this paving bed arises only after the paving blocks have been laid. WO 2009/144293 A1 relates to a setting and curing accelerator for hydraulic binders. These are used, for example, so that concrete or reinforced concrete constructions, which are also produced with respect to roadway renewals, can harden and be loaded as correctly as possible. Pavings or the use of paving blocks per se are not addressed in the document.

Taking this as the starting point, the object on which the invention is based is to develop ground coverings of the type stated at the outset.

To achieve this object, a ground covering according to the invention has the features of Claim 1. It is accordingly provided that the paving bed consists of a mixture of aggregate with an additive and a binder (bitumen). The additive which is used is a mixture consisting of a polymer with silica sand. The polymer is a polymer based on polycarboxylate ether. Furthermore, the polymer is processed in the dry state and with a pulverulent consistency. The placing of the mixture occurs on a cold placing. First of all, the aggregate is mixed with the additive and then binder is added. The mixing of the constituents occurs in the hot state, whereas the placement occurs by cold placing.

The placing of the mixture by cold placing has considerable advantages, since complicated measures for heating and for maintaining the necessary temperature for the processing of the mixture are not required, as is required, for example, during hot placing. In the case of the hot placing known from road construction, the bitumen is heated to about 100°C to 150°C, but not more than 170°C, in order to achieve a processable fluidity of the binder. By contrast, cold placing is understood to mean the processing and the placing in a temperature range from 0°C to 80°C, preferably at ambient temperature.

The ground covering according to the invention further has the particular advantage that, by comparison with the non-bound mode of construction, the precipitation water occurring can penetrate only very slightly into the supporting structure of the ground covering. In this way, the possible applications for ground coverings based on paving blocks are widened. As a result of the binder bitumen, the system behaves like a ground covering in an elastic mode of construction.

By contrast, for example, with cement-bound pavement constructions, the solution according to the invention makes it possible to avoid stress cracks which, in the case of cement-bound pavement constructions, make a water-permeable base course absolutely necessary because otherwise precipitation water penetrates into the construction, in particular due to frost stressing, resulting in damage.

Joints between the shaped blocks can be filled with a joint filling material consisting of aggregate, or with a joint filling material consisting of a mixture of aggregate with the additive and a binder.

The binding of the aggregate with the bitumen has the effect of immobilizing in particular the fine components of the aggregate. The bitumen-bound aggregate is overall less subjected to loading in the system than customary non-bound aggregate. A method according to the invention has the steps of Claim 7. Accordingly, in other words, it is provided that a material mixture to be produced cold and consisting of aggregate and an additive and also a binder is produced for the paving bed and that the mixture is processed by cold placing and that the pavement or the shaped blocks are laid (directly) on the paving bed which is applied (directly) to a base course. The additive used is a mixture consisting of a polymer with silica sand. Of particular importance is also the mixing order, namely at first a mixing of the aggregate with the additive and then the addition of bitumen as binder.

The paving bed is preferably placed in a superelevated manner such that, after the compacting of the paving bed, the ground covering has the intended height.

The silica sand preferably has a particle size from 0.1 to 2.0 mm, in particular from 0.1 to 1.0 mm.

According to a preferred embodiment, there is provision that the silica sand has an average particle size from 0.27 to 0.79 mm.

The binder is preferably bitumen.

The polymer preferably has a portion corresponding to from 0.05 to 0.3 % by weight of the binder content. To achieve uniform mixing, the polymer is to be mixed with at least 450g of silica sand.

Claims

1. Ground cover for use in motor vehicle traffic with a coating made of prefabricated paving stones made of natural or synthetic material, in particular concrete paving stones or concrete paving slabs, which have been laid in a paving bed, wherein the paving bed consists of a mixture of particulate particles together with an additive and a binder, and wherein the additive contains a polymer and silica sand, characterized in that the polymer is a polymer based on polycarboxylate ethers and that the polymer is used with a powdery consistency and that mixing of the additive with the rock particle fraction is carried out in a dry state.

Ground cover according to claim 1, characterized in that the silk sand has a particle size in the range of 0.1 to 2.0 mm, preferably 0.1 to 1.0 mm.

Ground cover according to claim 2, characterized in that the silk sand has an average particle size of from 0.27 to 0.79 mm.

Ground cover according to claim 1 or one of the other preceding claims, characterized in that the binder is bitumen.

Ground cover according to claim 1 or one of the other preceding claims, characterized in that the polymer is present at a ratio of from 0.05 to 0.3% by weight of the binder content.

Ground cover according to any one of the preceding claims, characterized in that joints between the shaped paving stones are filled with a unified filling material made from a mixture of a rock particle fraction with an additive and a binder.

7. A method of making a ground cover for use in motor vehicle traffic with a coating made of prefabricated paving stones made of natural or synthetic material, in particular concrete paving stones or concrete paving slabs, which is laid on a paving bed, wherein a paving bed mixture is made up of a rock particle fraction. and a binder, wherein the additive contains a polymer and silica sand and wherein the coating bed is established directly on a support layer and wherein the establishment of the mixture is carried out by cold installation, characterized in that to effect the mixture the rock particle fraction is first mixed with the additive and then the binder is added and the coating or paving stones are deposited directly in the coating bed.

Method according to claim 7 or one of the other preceding claims, characterized in that the coating or paving stones are compressed to obtain a very low water permeability through the ground deck.

Method according to claim 7 or one of the other preceding claims, characterized in that joints between the paving stones are filled with a unified filling material made of a mixture of rock particle fraction with an additive and a binder.

Process according to claim 7 or one of the other preceding claims, characterized in that the preparation of the mixture is carried out in a hot state.