SK1442000A3 - Composition and method for producing a road surface course - Google Patents

Abstract

The invention concerns a composition and a method for producing a road surface course for roadways with little or moderate traffic corresponding to not more than about 5000 vehicles per day. The composition is based on black japanned aggregates, the aggregates being 2/4 to 2/6 chippings and the lacquering being obtained by a bitumen emulsion. When the surface course is being produced, sand and a bitumen emulsion with controlled fracture and viscosity are spread over the black japanned aggregate composition surface, the whole being then compacted. The invention also concerns a corresponding surface course.

Description

Mixture for the construction of a road surface layer and method of construction

Technical field

The invention relates to a composition for the construction of a road surface layer and to a process for the construction of this layer as well as a corresponding surface layer. The invention finds application in the construction, construction and maintenance of transport routes.

BACKGROUND OF THE INVENTION

The road surface layer must have a certain number of features, in particular ensuring the impermeability of the entire road body, longitudinal and transverse surface uniformity, the necessary flatness and flatness to ensure vehicle stability and sufficient adhesion for vehicle braking purposes. This road surface layer must also show as low a level of noise as possible during the tire / road contact. After completion of road construction or maintenance, ideally, only insignificant flying of stones or gravel fragments must be ensured in order to avoid breaking the windshields of cars.

Road coatings that exhibit the aforementioned properties are usually formed using hot surface materials consisting of granules, bonded with bituminous or asphalt material. Such granulates are preferably stone gravels 4/6 or 6/10, which can be combined with 0/2 sand, these numerical values corresponding to the size of the granulate. Such surface materials are used in high-traffic roads, as well as in low or medium traffic roads, which corresponds to approximately 5000 vehicles per day or less.

Last but not least, the economic and mechanical constraints are not the same as in the case of high traffic. Indeed, investment opportunities are often reduced for smaller roads than for major roads. In addition, due to reduced traffic, the road surface is subject to less wear and tear. In addition, due to the preferential use of 4/6 or 6/10 stone gravel for road surfaces, granules of other sizes or sizes are often underestimated or remain unsold, resulting in reduced prices.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide and offer a composition for the construction of a road surface with low or medium traffic, which exhibits the above-mentioned features and properties, while being constructed at reduced costs.

However, this mixture can also be used for high-traffic roads, provided that it is the traffic of vehicles that are less aggressive to the road surface, such as bicycles, motorcycles or light cars, and the like. It can also be used for roads with high deflection above 100/100 mm, as well as for roads with low deflection.

For this purpose, the invention consists of a mixture of coated granules, said mixture being used in the last stage of construction of the tread.

In accordance with the present invention:

- the granulate is a stone gravel 1/2 to 2/8 and preferably 2/4 to 2/6,

- the gravel is coated with bituminous binder,

the bituminous binder is a bitumen emulsion.

The invention may also exhibit the following technical characteristics, taken individually or in accordance with all technically possible combinations, each having the respective advantages:

- the resin in the emulsion has 30 to 300 penetrations,

- the coating process is carried out cold,

- the coating process is carried out hot,

- the proportion of residual resin in the coated granulate mixture is in the range from 0.5% to 10%, preferably from 1% to 4%, the coated granulate mixture may be stored up to several months before its application,

the coated granulate mixture may be applied by means of a finisher or a leveling machine or a self-propelled vehicle for cold-coated surface materials or any other coating vehicle.

The tread is designed for roads with low or medium traffic, which corresponds to approximately 5,000 vehicles per day or less.

The present invention also provides a method of constructing a tread on a substrate, comprising the following steps:

- the adhesive layer may be laid on the substrate in accordance with the properties of said substrate,

- the mixture of coated granules is spread directly onto the substrate or by means of an adhesive layer, if any,

- there is a spreading bitumen emulsion with controlled strength and viscosity,

- there is sand,

- the whole assembly is compacted or rolled,

- the surface is brushed

The invention should also exhibit the following technical characteristics, which are taken individually or in accordance with all technically possible combinations:

- the granulate is a stone gravel 1/2 to 2/8 and preferably 2/4 to 2/6,

- the stone gravel is coated with bituminous binder,

- the bituminous binder is a bitumen emulsion,

- the resin in the emulsion has 30 to 300 penetrations

- the coating process is carried out cold,

- the coating process is carried out hot,

- the proportion of residual resin in the coated granulate mixture is in the range from 0.5% to 10%, preferably from 1% to 4%, the coated granulate mixture may be stored up to several months before its application,

the coated granulate mixture can be applied with the aid of a finisher or a leveling machine or a self-propelled vehicle for cold-coated surface materials or any other coating vehicle.

- the tread is intended for roads with low or medium traffic corresponding to approximately 5000 vehicles per day or less.

- sand is dredged sand,

- the sand is 0/1 to 0/4 and preferably 0/2 to 0/4,

- the purity of the sand may be limited to an equivalent of sand greater than or equal to 40,

- the sand dosage is in the range of from 1 to 20 kg / m ^{2 of} tread and preferably from 3 to 5 kg / m ² ,

- the controlled strength and viscosity bitumen emulsion is metered in order to achieve a dose of residual resin ranging from 100 to 5000 g / m ^2, preferably from 400 to 1000 g / m ² ,

- the sand may be metered to prevent it from moving between the voids in the mixture of coated granulate,

- the roughness, measured using the so-called sand height method on the tread, provides results ranging from 0.5 to 1 mm Hsv.

The present invention further provides a tread comprising:

- coated stone gravel, spread on the substrate directly or on an adhesive layer, the stone gravel being coated with a binder in the form of a bitumen emulsion, providing a residual resin ratio in the range of 0.5% to 10% preferably from 1% to 4%, the stone gravel is 1/2 to 2/8 and preferably 2/4 to 2/6, wherein the coated stone gravel is dosed from 30 to 60 kg / m ^{2 of} tread surface in the range of 10 to 100 mm,

- sand 0/2 to 0/4 for dosing in the range of 3 to 5 kg / m ^{2 of} tread,

a viscosity-controlled bitumen emulsion to provide a residual resin ratio in the range of from 100 to 5000 g / m ^2, preferably from 400 to 1000 g / m ² .

The subject invention may also exhibit the following technical characteristics, which are taken individually or in accordance with all technically possible combinations:

- the granulate is a stone gravel 1/2 to 2/8, preferably 2/4 to 2/6,

- the stone gravel is coated with bituminous binder,

- the bituminous binder is a bitumen emulsion,

- the resin in the emulsion has 30 to 300 penetrations,

- the coating process is carried out cold,

- the coating process is carried out hot,

- the proportion of residual resin in the coated granulate mixture is in the range from 0.5% to 10%, preferably from 1% to 4%, the coated granulate mixture may be stored up to several months before its application,

- the mixture of coated granules may be applied with the aid of a finisher or a leveling machine or a self-propelled vehicle for cold application of surface materials or any other application vehicle,

- the dosage of the coated granulate mixture is in the range from 10 to 180 kg / m ^{2 of} tread, preferably from 30 to 60 kg / m ² for a thickness in the range from 10 to 100 mm,

- sand is dredged sand,

- the sand is 0/1 to 0/4 sand, preferably 0/2 to 0/4,

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- the purity of the sand may be limited to an equivalent of sand greater than or equal to 40,

- the sand dosage is in the range from 1 to 20 kg / m ^{2 of} tread, preferably from 3 to 5 kg / m ² ,

- the controlled strength and viscosity bitumen emulsion is metered in order to obtain a dose of residual resin ranging from 100 to 5000 g / m ^2, preferably from 400 to 1000 g / m ² ,

- the sand may be metered to prevent it from moving between the voids in the mixture of coated granulate,

- the roughness, measured using the so-called sand height method on the tread, provides results ranging from 0.5 to 1 mm Hsv.

The tread is designed for low or medium road use

I traffic that corresponds to approximately 5,000 vehicles a day or even less.

The tread of the present invention satisfies all the criteria for surface coatings intended for small and medium traffic, the roughness modulus of this complex being less than or equal to 3000 MPa.

Uniformity and flatness is achieved by using coated granules, impermeability and roughness is achieved by filling cavities and brushing sand, while the consistency of the whole system prevents the gravel from flying off, while low noise levels are achieved preferably using 2/4 to 2 gravel gravel. / 6th

The above characteristics are achieved at low cost, using underestimated or unsold excavated materials.

DETAILED DESCRIPTION OF THE INVENTION

The invention will be explained in more detail below on the basis of a description of exemplary embodiments thereof in the form of a road surface for low or medium traffic.

In the first stage, a mixture of coated granules is formed, wherein the gravel 4/6 is inserted into a device into which the bitumen emulsion is further inserted. In this apparatus, the bituminous emulsion comes into contact with the gravel, the mixture being agitated to distribute the emulsion evenly over the surface of the gravel and to achieve a uniform coating. This coating process is carried out cold.

After leaving the coating device, the coated gravel mixture is transported to a landfill. This storage may take from a few days to several months. At the construction site of the road there is a foundation necessary for stabilization of the future tread. In the case where the substrate exhibits low adherence to the coated granulate mixture, an adhesive layer must be formed on said substrate before spreading the coated gravel mixture. The coated gravel is transported to the road construction site, where it is spread on a given substrate using a leveling machine.

In this example, approximately 40 kg of a mixture of coated stone gravel is used per m ^{2 of} road surface for an average thickness of 50 mm. The bitumen emulsion, whose strength and viscosity is controlled with respect to the outside ambient temperature and humidity, as well as 0/2 dred sand, is spread over the layer of the coated gravel mixture.

In this example, 4 kg of sand per 1 m ^{2 of} tread was used. The dosage of the emulsion resin is selected to be achieved by the ratio of approximately 500 g of a residual resin per 1 m ^J tread. The resulting surface is then rolled and brushed. The tread thus formed is impermeable in accordance with the above characteristics, and measurements made at the construction site using a permeability measuring device have shown permeability values ranging from 2 to 15. 10 ^-4 . In addition, the roughness measurements carried out by the so-called sand height method yielded results ranging from Hsv of 0.5 to 1 mm.

The foregoing example, just described, is provided for exemplary purposes only, and is not intended to limit the scope of the invention in any way.

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Claims (10)

PATENT CLAIMS A mixture for the construction of a road surface comprising a binder and a granulate, characterized in that: - the binder is a bitumen emulsion, - the granulate is a stone gravel 1/2 to 2/8, preferably 2/4 to 2/6, since the gravel is coated with a binder, the residual resin ratio in the coated granulate mixture is in the range of 0.5% to 10%, preferably 1% to 4% with 30 to 300 resin penetration. A composition according to claim 1, characterized in that the coating is carried out cold. 3. A method of constructing a road surface, characterized in that: - the coated stone gravel is spread over the road surface for forming the layer, the adhesive layer being interposed between said substrate and said coated stone gravel, said stone gravel being a stone gravel 1/2 to 2/8, preferably 2/4 to 2/6 wherein the coating process is carried out by means of a bitumen emulsion, and wherein the ratio of residual resin is in the range of 0.5% to 10%, preferably 1% to 4% with 30 to 300 resin penetration. A method according to claim 3, characterized in that the coated gravel is used in a ratio of 10 to 100 kg / m ^{2 of} tread surface preferably from 30 to 60 kg / m ² for a layer thickness of from 10 to 100 mm. Method according to claim 3 or 4, characterized in that the bituminous emulsion and the viscosity-controlled sand are spread over a layer of coated stone gravel, whereby the tread is compacted or rolled and then the tread is brushed. Method according to claim 5, characterized in that the sand is dug sand 0/1 to 0/4, preferably 0/2 to 0/4 in a ratio of 1 to 20 kg / m ^{2 of} tread, preferably from 3 to 5 kg / m ² . Method according to claim 5 or 6, characterized in that the viscosity-controlled bitumen emulsion provides an addition of residual resin in the range from 100 to 5000 g / m 2 ^- preferably from 400 to 1000 g / m ² . 8. Road surface comprising: - coated stone gravel, spread on the substrate directly or on an adhesive layer, the stone gravel being coated with a binder in the form of a bitumen emulsion, providing a residual resin ratio in the range of 0.5% to 10% preferably from 1% to 4%, the stone gravel is 1/2 to 2/8, and preferably 2/4 to 2/6, wherein the coated stone gravel is dosed from 30 to 60 kg / m ^{2 of} tread for a thickness in the range of 10 to 100 mm. - sand 0/2 to 0/4 for dosing in the range of 3 to 5 kg / m ^{2 of} tread, a viscosity-controlled bitumen emulsion to provide a residual resin ratio in the range of from 100 to 5000 g / m ^2, preferably from 400 to 1000 g / m ² . The tread according to claim 8, characterized in that the sand is dredged sand, the purity of which may be limited to a sand equivalent of greater than or equal to 40. A tread according to any one of the preceding claims, characterized in that it is intended for small and medium-sized traffic and has a roughness which, when measured using the so-called sand-height method, provides results ranging from Hsv 0, 5 to 1 mm, the modulus of which is less than or equal to 3000 MPa.