ES2237416T3 - SURFACE COAT OF DOUBLE INSONORIZING AND DRAIN COAT. - Google Patents

Abstract

Soundproofing and drainage double layer surface coating, each layer of the surface coating being composed of a bituminous conglomerate comprising: a) an aggregate of stones, b) a filling, and c) a bituminous ligand, said surface coating being characterized because it consists of : 1) an upper layer with a thickness between 2 and 5 cm consisting of a bituminous conglomerate comprising: a) an aggregate of stones composed of elements of dimensions between 0.075 and 10 mm in an amount between 88 and 98% by weight; b) a filler in an amount between 2 and 12% by weight; and c) a bituminous ligand that has the following characteristics: Penetration at 25 ° C [0.1 mm] CNR 24/71 30-90, Softening point [° C] CNR 35/73> 60, Frailty point Fraas [ºC] CNR 43 / 74 <-15, Elastic flow at 25 ° [%] DIN 52013> 50 in an amount between 3, 5 and 5, 5% by weight with respect to the sum of components a) and b), and 2) one layer lower with a thickness between 2 and 7 cm composed of a bituminous conglomerate comprising: a¿) an aggregate of stones composed of elements of dimensions between 0, 125 and 20 mm in an amount between 85 and 98% by weight; b¿) a filler in an amount between 2 and 15% by weight; and c¿) a bituminous ligand that has the characteristics indicated in point c), in an amount between 3, 5 and 5, 5% by weight with respect to the sum of the components a¿) and b¿).

Description

Double layer surface coating Soundproofing and drainage.

The present invention relates to a double layer soundproofing and drainage surface coating, to its use in racing circuits and paving of roads, and the means and procedure for their preparation.

The surface coatings used in racing circuits, highways, national roads and Urban with heavy traffic require good mechanical properties, and high grip power and regularity of its surface. These properties have traditionally been obtained using "closed" surface coatings, that is, with a reduced content in residual voids. This solution, without However, it is useless when it rains.

In fact, the rain stagnates on the surface, with the consequent reduction in the grip of the tires (aquaplaning), also producing water spray that reduce visibility

In order to solve these disadvantages, it they developed the "open" surface coatings, also called draining pavements, whose use in the Road paving began on a large scale towards mid of the eighties, applying on highways and roads National and urban.

Draining pavements, as given to know in document no. EP-A-0381903, are characterized mainly due to a high percentage of residual holes (> 18%), obtained by adopting inert products with a curve discontinuous particle size that guarantees, compared to Closed pavements, the following advantages:

-

improvement in the grip of the tires on the surfaces wet;

-

reduction of water spray generated for the tires in case of rain;

-

elimination of aquaplaning;

-

reduction of the external sound level at car due to the absorption of acoustic energy; Y

-

reduction in light reflection nocturnal

In comparison with the coatings closed surfaces, however, these pavements have a reduced structural strength and a tendency to get dirty quickly, thereby blocking the gaps and consequently reducing drainage capacity.

Consequently the use of these draining pavements do not seem to be very suitable for particular applications such as, for example, paving of racing circuits, in which there are major problems of structural resistance and fouling.

At present it has been discovered that disadvantages of the known technique discussed above may overcome by using a surface coating which consists of two layers that have different thickness and aggregates of stones (inert products) with different curves granulometric

Particularly, the use of asphalts modified that have reduced thermal susceptibility, high elasticity, high adhesion to inert products and a good resistance to aging, in combination with such double layer structure, allows to obtain the advantages following:

(to)

enhanced crush resistance compared to traditional draining pavements;

(b)

sound impact reduction not only external but, unexpectedly, also within the vehicle;

(C)

a draining capacity that decreases more slowly over time; Y

(d)

a less tendency to fouling (pore blockage).

The top layer, in fact, obtained with agglomerates of reduced dimensions, due to its texture it acts as a sieve for impurities present on the surface of the highway. In this way, the larger impurities are retained on the surface without blocking the pores and can be mechanically removed by passing vehicles. The smaller impurities penetrate through both layers and can be easily removed by rainwater through the larger holes in the bottom layer.

In accordance with the above, the The present invention relates to a surface coating of double soundproofing and drainage layer as defined in the claim 1, comprises:

(one)

a upper layer with a thickness between 2 and 5 cm composed by a bituminous conglomerate comprised of:

(to)

a aggregate of stones composed of elements of dimensions between 0.075 and 10 mm in an amount between 88 and 98% by weight;

(b)

a filling in an amount between 2 and 12% by weight;

(C)

a bituminous ligand with the characteristics indicated in table 2, in an amount between 3.5 and 5.5% by weight with respect to the sum of the components (a) and (b); Y

(2)

a lower layer with a thickness between 2 and 7 cm, which It consists of a bituminous conglomerate comprised of:

(to')

a aggregate of stones composed of elements of dimensions between 0.125 and 20 mm in an amount between 85 and 98% by weight;

(b ')

a filling in an amount between 2 and 15% by weight; Y

(C')

a bituminous ligand with the characteristics indicated in table 2 in an amount between 3.5 and 5.5% by weight with respect to the sum of the components (a ') and (b').

The top layer of the surface coating Soundproofing and draining preferably has a thickness between 2.5 and 4 cm and is composed of:

(to)

a aggregate of stones formed by elements of dimensions between 0.075 and 7.1 mm in an amount between 90 and 95% by weight;

(b)

a filling in an amount between 5 and 10% by weight; Y

(C)

a bituminous ligand with the characteristics indicated in table 2 in an amount between 4 and 5% by weight with respect to the sum of the components (a) and (b).

The bottom layer of the surface coating Soundproofing and draining preferably has a thickness between 3 and 7 cm and consists of:

(to')

a aggregate of stones composed of elements of dimensions between 0.125 and 15 mm in an amount between 90 and 95% by weight;

(b ')

a filling in an amount between 5 and 10% by weight; Y

(C')

a bituminous ligand with the characteristics indicated in table 2 in an amount between 4 and 5% by weight with respect to the sum of the components (a ') and (b').

Aggregates of stones that can be used they consist of hard and healthy granular elements, not flattened, elongated or lenticular, clean and without foreign matter, in accordance with the C.N.R. 139/1992.

These aggregates typically present the characteristics indicated in table 1.

TABLE 1

one

Fillers are those used conventionally for the production of conglomerates. They are usually powders with a particle size less than 0.125 mm.

Examples of fillers suitable for Aim of the present invention comprise calcium carbonate and cement.

The bituminous ligand is selected from among modified asphalts that have the characteristics indicated in table 2.

TABLE 2

2

Preferably a modified asphalt is used with a softening point greater than 80 ° C and an elastic flow at 25ºC higher than 80%.

Asphalt is particularly preferred modified containing SBS polymers (styrene-butadiene-styrene) that obtain, for example, as described in US Pat. No. 5,756,563 or, for example, of the type marketed by AGIP PETROLI Spa. under the trade name ELIFLEX®.

Table 3 shows some of the characteristics of the floors of the present invention.

TABLE 3

3

The characteristics of sound absorption, determined by sound level measurements, not only indicate a reduction of noise outside the vehicle, but also a reduction of the same within the vehicle of more than 3 decibels.

The bituminous conglomerate is prepared under heating in a suitable plant by introducing the aggregate of stones, asphalt and filling in mutual contact in the appropriate amounts.

The temperature and mixing time is usually select in relation to materials and climatic conditions during placement. In any case, the mixing conditions are selected so that a conglomerate is obtained that it has an adequate placement temperature that allows a tamping cash.

The floor of the present invention is prepared through:

(i)

the placement of a first lower layer with a thickness included between 2 and 7 cm and composed of a bituminous conglomerate that understands:

(to')

a aggregate of stones composed of elements of dimensions between 0.125 and 20 mm in an amount between 85 and 98% by weight;

(b ')

a filling in an amount between 2 and 15% by weight; Y

(C')

a bituminous ligand with the characteristics indicated in table 2 in an amount between 3.5 and 5.5% by weight with respect to the sum of the components (a ') and (b'); Y

(ii)

he curing of said first layer; Y

(iii)

the placement on said first layer of a second upper layer with  a thickness between 2 and 5 cm composed of a conglomerate bituminous comprising:

(to)

a chipboard composed of elements of dimensions included between 0.075 and 10 mm in an amount between 88 and 98% in weight;

(b)

a filling in an amount between 2 and 12% by weight; Y

(C)

a bituminous ligand with the characteristics indicated in table 2 in an amount between 3.5 and 5.5% by weight with respect to the sum of components (a) and (b).

In practice, before proceeding to placement of the conglomerate, all the usual operations, which consist of the milling of the layer damaged, profiled and washed.

Next a membrane is placed waterproofing on the base layer to protect it from the infiltration of rainwater.

Said membrane consists of modified asphalt, preferably an asphalt identical to that used for cluster preparation, conveniently saturated with gravel or stuffing.

Then the bituminous conglomerate is placed on said membrane in order to obtain a first layer bottom with the characteristics indicated above.

After placing the bottom draining layer, it is It is advisable to maintain a cure time of not less than two days before proceeding to the placement of the top layer.

The bituminous conglomerate is placed using Vibrating finishers in parallel slightly zigzag, avoiding in this way, or in any case reducing, the joints Longitudinal These must be treated particularly (flanking and compaction) to prevent the stagnation of rain or the reduction of draining capacity.

Tamping is carried out using techniques conventional.

The soundproofing and surface coating drainage of the present invention is particularly suitable for paving racing circuits and roads with heavy traffic

Claims (12)

1. Double layer surface coating Soundproofing and drainage, each layer of the surface coating by a bituminous conglomerate that understands:

to)

a aggregate of stones,

b)

a padding, and

C)

a bituminous ligand,

said surface coating being characterized in that it consists of:

one)

a upper layer with a thickness between 2 and 5 cm consisting in a bituminous conglomerate comprising:

to)

a aggregate of stones composed of elements of dimensions between 0.075 and 10 mm in an amount between 88 and 98% by weight;

b)

a filling in an amount between 2 and 12% by weight; Y

C)

a bituminous ligand presenting the characteristics following:

Penetration at 25 ° C [0.1 mm] CNR 24/71 30-90, Point of softening [ºC] CNR 35/73 > 60, Fragility point Fraas [ºC] CNR 43/74 <-15, Flow elastic at 25º [%] DIN 52013 > 50 in an amount between 3.5 and 5.5% by weight with respect to the sum of components a) and b), Y

2)

a bottom layer with a thickness between 2 and 7 cm composed by a bituminous conglomerate comprising:

to')

a aggregate of stones composed of elements of dimensions between 0.125 and 20 mm in an amount between 85 and 98% by weight;

b ')

a filling in an amount between 2 and 15% by weight; Y

C')

a bituminous ligand that presents the characteristics indicated in the point c), in an amount between 3.5 and 5.5% by weight with with respect to the sum of the components a ') and b').

2. Surface coating according to claim 1, wherein the top layer has a thickness between 2.5 and 4 cm and consisting of:

to)

a aggregate of stones composed of elements of dimensions between 0.075 and 7.1 mm in an amount between 90 and 95% by weight;

b)

a filling in an amount between 5 and 10% by weight; Y

C)

a bituminous ligand that presents the characteristics indicated in the claim 1, in an amount between 4 and 5% by weight with respect to the sum of components a) and b).

3. Surface coating according to claim 1, wherein the bottom layer has a thickness between 3 and 7 cm and consisting of:

to)

a aggregate of stones composed of elements of dimensions between 0.125 and 15 mm in an amount between 90 and 95% by weight;

b)

a filling in an amount between 5 and 10% by weight; Y

C)

a bituminous ligand with the characteristics indicated in the claim 1, in an amount between 4 and 5% by weight with respect to the sum of components a) and b).

4. Surface coating according to claim 1, wherein the stone aggregates are composed of healthy and hard granular elements, with no shape elongated or lenticular flattened, clean and without foreign matter. 5. Surface coating according to claim 1, wherein the padding is selected from calcium carbonate and cement. 6. Surface coating according to claim 1, wherein the bituminous ligand is an asphalt modified containing polymers of styrene-butadiene-styrene. 7. Surface coating according to claim 1, wherein the bottom layer is attached to a waterproofing membrane consisting of modified asphalt saturated with gravel or filling. 8. Surface coating according to claims 1 to 7, used for paving racing circuits, highways, and national roads and Urban 9. Procedure for the preparation of Soundproofing and drainage double layer surface coating according to claim 1, comprising:

i)

the placement of a first lower layer with a thickness included between 2 and 7 cm and composed of a bituminous conglomerate that understands:

to')

a aggregate of stones composed of elements of dimensions between 0.125 and 20 mm, in an amount between 85 and 98% by weight;

b ')

a filling in an amount between 2 and 15% by weight; Y

C')

a bituminous ligand with the following characteristics:

penetration at 25 ° C [0.1 mm] CNR 24/71 30-90, Point of softening [ºC] CNR 35/73 > 60, fragility point [ºC] CNR 43/74 <-15, flow elastic at 25º [%] DIN 52013 > 50 in an amount between 3.5 and 5.5% by weight with respect to the sum of components a ') and b '); Y

ii)

he curing of said first layer; Y

iii)

the placement on said first layer of a second upper layer with a thickness between 2 and 5 cm composed of a conglomerate bituminous comprising:

to)

a aggregate of stones composed of elements of dimensions between 0.075 and 10 mm in an amount between 88 and 98% by weight;

b)

a filling in an amount between 2 and 12% by weight; Y

C)

a bituminous ligand that presents the characteristics indicated in the point c '), in an amount between 3.5 and 5.5% by weight with regarding the sum of components a) and b).

10. Method according to claim 9, in which the bottom layer has a thickness between 3 and 7 cm and that consists of:

to')

a aggregate of stones composed of elements of dimensions between 0.125 and 15 mm, in an amount between 90 and 95% by weight;

b ')

a filling in an amount between 5 and 10% by weight; Y

C')

a bituminous ligand with the characteristics indicated in the claim 9, in an amount comprised between 4 and 5% by weight with respect to the sum of the components a ') and b').

11. Method according to claim 9, in which the top layer has a thickness between 2.5 and 4 cm and consisting of:

to)

a aggregate of stones composed of elements of dimensions between 0.075 and 7.1 mm, in an amount comprised between 90 and 95% by weight;

b)

a filling in an amount between 5 and 10% by weight; Y

C)

a bituminous ligand with the characteristics indicated in the claim 9, in an amount comprised between 4 and 5% by weight with respect to the sum of components a) and b).

12. Method according to claim 9, in which the bottom layer is placed on a membrane waterproofing composed of a modified asphalt saturated with gravel or stuffing.