AU749952B2 - Hot-setting bitumen-coated material containing rubber - Google Patents

Hot-setting bitumen-coated material containing rubber Download PDF

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Publication number
AU749952B2
AU749952B2 AU43024/00A AU4302400A AU749952B2 AU 749952 B2 AU749952 B2 AU 749952B2 AU 43024/00 A AU43024/00 A AU 43024/00A AU 4302400 A AU4302400 A AU 4302400A AU 749952 B2 AU749952 B2 AU 749952B2
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Prior art keywords
coated material
rubber
bitumen
rubber powder
smaller
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AU43024/00A
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AU4302400A (en
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Eric Godard
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Colas SA
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Colas SA
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00Coherent pavings made in situ
    • E01C7/08Coherent pavings made in situ made of road-metal and binders
    • E01C7/18Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
    • E01C7/26Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
    • E01C7/265Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1022Coating the solid ingredients by passing same through a shower or cloud of binder
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1068Supplying or proportioning the ingredients

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Paving Machines (AREA)

Description

A hot bituminous rubber-containing coated material, a method of manufacture of such a coated material and a method of realisation of such a road carpet with such a coated material The invention relates to a hot-coated material, intended for making a rubber-containing road carpet. The invention also regards a method of manufacture of such a bituminous-coated material and a method of realisation of a road carpet with such a coated material.
For numerous years, road coatings have been made with coated materials containing reclaimed rubber. Such an example is known from the document EP-A-0.672.791.
Injecting rubber into bitumen enables enhancing the properties of the coated materials, conferring increased flexibility to the coatings manufactured, improving their fatigue resistance at low temperatures and reducing noise and light source reflection phenomena. Using reclaimed rubber enables indeed contributing to the disposal of used tyres of various origins.
It is thus that processes have been developed in which rubber is mixed with bitumen in the way of an aggregate.
In order to implement this type of process, it has been considered as necessary to use granules with size ranging from 1 to 3 or 2 to 4 mm, i.e.
rubber granules with size comparable to stone chippings (see for example US- A-4.548.962).
A road carpet was then produced that, at least in some locations, exhibited a rubber thickness of several millimetres between two traditional granulates or stone chippings. Since rubber has an extremely low modulus of elasticity, such a rubber thickness between two traditional granulates that are made of hard materials, leads to very significant deformations of the coating when subjected to high local stress such as that produced by the driving of a lorry and hence to significant deformation of the coating thereby causing rapid degradation of the said rubber thickness.
To remedy this problem, a portion of the sand fraction that usually accompanies the stone chippings, has been replaced with rubber powder T whose particles have an average diameter ranging from 0 to 1.5 mm. The f-\ 2 granular skeleton thus produced is then added a bituminous binder that could be pure bitumen or bitumen modified by additives, often polymers.
The latter technique gives satisfaction, globally. However, it has been sought to improve the resistance of the carriageway, for example for application in parking areas where manoeuvres are frequent and very tight steering locks.
Besides, it has been noticed that rubber is sensitive to moistness, which sometimes generates a number of shortcomings.
The purpose of the invention is to suggest a hot bituminous-coated material comprising rubber powder, which avoids the shortcomings mentioned above.
The bituminous-coated material should also enable to obtain a road carpet with good surface water-drainage capacity and good sound properties.
The purpose of the invention is satisfied with a hot bituminous-coated material intended for making a road carpet and comprising to that effect a granular mixture with discontinuous size and, by way of a binder, bitumen. The granular mixture comprises stone chippings, a sand fraction and rubber powder, whereas the sand fraction and the rubber powder taken together have a volume smaller than the interstitial volume of the stone chippings.
According to the invention, the particle size of the rubber powder is smaller than 1.5 mm and the rubber percentage in the granular mixture is smaller than 1.5 in mass.
To ensure good roughness, the total sand content (mineral rubber) should not exceed the volume of interstitial voids between the stone chippings, i.e. approx. 30 to 40% of the global volume. Thus, rubber powder is used as a substitute for, and not in addition to, the conventional sand fraction.
The invention also regards the characteristics considered thereunder individually or according to all the technically possible combinations: The binder of the hooking layer can be pure bitumen, also called conventional bitumen, or modified bitumen and notably an emulsion of pure bitumen or an emulsion of bitumen modified by polymers. Elastomer emulsions will also be used, but not necessarily, further to their chemical affinity with rubber.
The grain size of rubber is selected close to that of a sand as fine as possible: 0/1 mm (90% of the particles have a size smaller than 1.0 mm, i.e. the refuse ratio of rubber particles through the 1-mm sieve should be smaller than of the dry mass of the sample). This selection enables replacing a portion of the sand making up the granular skeleton of bitumen, with rubber, while guaranteeing the required characteristics of the coated material.
The rubber percentage in the granular mixture ranges from 0.5 to 1%.
The granular mixture contains, in addition of the sand fraction, stone chippings and rubber, a proportion of rock powder (preferably calcareous) at 0io least equal to 1.5% of the total mass of granulates.
This rock powder, also called filler, is characterised in that 90% of its mass goes through an 80-p sieve.
The size distribution of the granular mixture is determined using calculations in terms of volume fractions of the granular mixture.
Indeed, taking into account the significant difference in density between the various components i of the granular mixture, i.e. the stone chippings, the sand fraction and rubber, the size distribution must be expressed in volume fractions rather than in mass fractions if good image of the size distribution is required.
The volume proportion Vi of each component i of the granular mixture is calculated by the following equation: Vi 100Pi pi li(Pi/pi) Where Pi: mass proportion of the component i And pi: actual density of the component i.
The size distribution of the granular mixture is calculated according to the formula: Bj (Ei (Aij Vi)) 100 Where Bj: percentage of undersizes in volume of the mixture through a sieve j, And Aij: percentage of undersizes in mass of the component I through the sieve j.
The bitumen content L, i.e. the mass ratio between bitumen and the total mass of the coated material, is calculated from a cement percentile K, a conventional specific surface E and a coefficient a for correcting the actual density of the components i using the following relation: L=K. ac. s'/l Where: K: value ranging from 3.5 to ac: a 2.65 pi Z is defined by 100 E 0.25 G 2.3 S 12 s 135 f 450 KU with the following weightings: G grains larger than 6.3 mm S grains from 6.3 mm to 0.315 mm s grains from 0.315 mm to 0.08 mm f grains smaller than 0.08 mm KU rubber particles.
The weighting proportion KU takes the particular absorbing quality of rubber into account with respect to a calcareous filler: whereas the absorbing power of a calcareous filler is 50 g (fine mass for 15 g bitumen), it is 15 g for rubber. Rubber absorbs therefore 50/15 3.33 times more bitumen than filler.
The cement percentile ranges preferably from 3.8 to 4.2.
The bitumen content ranges advantageously from 4 to 14% in weight.
Tables I and II show two calculation results, i.e. two reconstructions of compositions made of bituminous coated materials according to the invention with stone chippings with size distribution 0/10 and respectively 1% and rubber.
Rubber is a porous matter and humidity sticks deeply inside its structure as soon as its ratio becomes important. The natural humidity of rubber when z iaI produced is small, i.e. generally less than 0.5 This ratio is acceptable for the manufacture of sound coated material and it should not exceed 1% in mass.
Rubbed humidifies generally during packaging, transport and especially storage operations. In particular during storage on the coated materials production sites, it is cumbersome to protect rubber bags. The result is an increase in its hygrometry in case of rain.
It has been noted that loading rubber with a certain quantity of bitumen, in the order of 1 to 15% of its mass, enables restricting the capacity of rubber considerably to absorb deeply set water. The presence of bitumen around rubber particles makes them waterproof.
The improved behaviour of the rubber powder can be obtained easily by pre-treatment of rubber powder, i.e. while spraying bitumen onto the rubber powder at the end of the production line. It suffices to pass the rubber powder freshly produced into a chamber where bitumen is nebulized (micronised) at a temperature in the order of 150 0
C.
The humidity ratio is measured according to so-called 'stove-drying' method that is described in detailed in the standard NF P 94 050.
The rubber powder thus treated is then used conventionally. It should be taken into account that a portion of the bitumen has already been integrated into the rubber powder and the quantity of bitumen in the formula of the coated material should be corrected by the corresponding quantity.
The behaviour of the coated material on the carriageway in the presence of water must be checked. A methodology for checking the mechanical behaviour of the mixture in the presence of water has been established. This methodology consists in conducting two particular tests: a) The classical Duriez test, requiring an immersion-compression value greater than 0.85 and preferably greater than 0.90 whereas a value greater than 0.75 or 0.80 is considered usually as sufficient for conventional coated materials.
b) The CANTABRO fatigue test (Spanish standard NLT 352/86, method established in Spain for draining coated materials) modified in that the number Sof revolutions of the drum called 'Los Angeles' has been increased from 300 to 500 and in that the test temperature is set to 18 0 C. Under these conditions, the loss percentage of the coated material test pieces must be smaller than 10% of the initial mass of the coated material.
The coated material is applied as a thin carpet on a road, whereas the thickness of the layer ranges from 1.5 to 4 cm, preferably from 2.0 to 3.0 cm for a size distribution 0/6 and from 2.5 to 3.5 cm for a size distribution 0/10.
The invention also relates to a method of manufacture of a hot bituminous coated material intended for making a road carpet and comprising a granular mixture with discontinuous size and, by way of a binder, a conventional bitumen or a modified bitumen, whereas the granular mixture comprises stone chippings, a sand fraction and rubber powder, whereby the process comprises the following stages; bringing the stone chippings and the sand fraction to the coating temperature and mixing them with the binder in order to produce the bituminous coated material.
According to the invention, the rubber percentage is added with a percentage smaller than 1.5% in the volume of the granular mixture, whereas the size of the particles of the rubber powder is smaller than 1.5 mm.
As rubber is sensitive to very high temperatures, in particular the presence of a flame, it is introduced in one point of the line of manufacture where the granulates have already reached the requested coating temperature.
Moreover, whatever the mode of manufacture of the bituminous coated material, the small size of the particles and their resulting small weight should be taken into account, when injecting the rubber. Because of both these characteristics, rubber is a matter liable to be attracted by the strong draft of the drying process. In order to compensate for this shortcoming, rubber is injected generally just before the end of the drying zone of the stone chippings and of the sand fraction.
The invention also relates to the following characteristics, considered individually and in all their technically possible combinations: In case of manufacture of the coated material using a discontinuous plant, the reclaimed rubber is injected to the mixer as thermomeltable bags and continuously at the foot of the hot elevator.
In case of manufacture of the coated material using a continuous plant fitted with a dosing hopper that enables bringing a granulate to the foot of the hot elevator, the said hopper can be used.
In case of manufacture of the coated material using a continuous plant with a separate mixer, the reclaimed rubber is injected to the mixer and at the foot of the hot elevator at the end of the drying process.
In case of manufacture of the coated material using a continuous coating plant with a mixing device integral with the drying drum, it is necessary to have a dosing hopper in order to integrate the rubber at the end of the drying process of the mineral aggregates via the recycling ring. If it is not possible, feedscrew or pneumatic transport injection is used.
To make sure that the humidity ratio of the rubber powder does not exceed 1% in mass, two alternatives are available. According to the first one, the humidity ratio of the rubber powder is measured before injecting it into the mixer and therefore into the mixture of stone chippings and sand fraction and the humidity ratio is corrected if needed. According to the second alternative, the micronised rubber described above is used.
The invention relates, besides, to a method of manufacture of a road carpet with a bituminous-coated material such as defined above.
According to the invention, this method of manufacture comprises the following stages: application of a hooking layer onto the road intended for receiving the carpet, application of one layer of the said bituminous coated material and compacting this bituminous coated layer.
According to a preferred embodiment of the invention, the bituminouscoated material spread is compacted with another device than a wheeled compactor. Similarly, the coated material should not stick to the balls in the compactor.
Other characteristics and advantages of the invention will be underlined by the description of two embodiments of the coated material according to the invention and one example of implementing the method of manufacture of a bituminous coated material according to the invention.
The description of the implementation of the method of manufacture is made with reference to the single Figure showing a drum-drier-mixer and elements necessary to the rubber infeed.
As this already appears on tables I and II introduced above, the bituminous coated material of the invention comprises mainly stone chippings of various sizes, containing a sand fraction, rubber powder and bitumen.
Tables III and IV show two other examples of compositions. The first example is a bituminous coated material comprising 1% rubber, designated thereafter coated material A, whereas the second example is a bituminous coated material comprising 2% rubber, designated thereafter coated material B.
The coated material A comprises first of all a granular mixture composed of 95.5 mineral granulates among which 78.5 have a size distribution 6/10 whereas 17% have a size distribution 0/2 as well as 1% rubber with size distribution 0/1. A filler completes this mixture.
A modified bitumen is added to this mixture of granulates and rubber. It accounts for 6.6% of the mass of the dry granulates.
The bituminous coated material B differs from the coated material A in the percentages of the various components. Thus, the granulate-rubber mixture comprises 83% of mineral granulate with size distribution 6/10 and 12% of mineral granulate with size distribution 0/2. The rubber percentage with size distribution 0/1 is 2% and that of the filler is The proportion of bitumen is 6.6%.
The coated materials A and B are manufactured at 165°C and 1500C respectively.
In order to illustrate the discontinuous size distribution of the mixture of granulates used for making bituminous coated materials according to the invention, table IV presents a size distribution according to the standard P 18- 560 of the mineral granulates 6/10 and 0/2. Moreover, table IV contains the numeric values of the coefficients defined above, i.e. the specific surface E, the cement percentile K, the theoretical density of the granulates and the actual density Vi of the granulates.
k
V-"
The advantages of the bituminous-coated material according to the invention are underlined by the conventional tests performed.
The results of the tests are presented in table IV. These results show the compactability and the compression strength and the water and air behaviour of the coated materials A and B.
Particular tests such as the CANTABRO test, which enables assessing the weight loss of the test piece when subject to fatigue, and a creep/relaxation test has been conducted on the coated material A.
Indeed, the CANTABRO test consists in moulding cylindrical pieces of approximately 1300 g, then in using them at a selected temperature of 18 0 C in a Los Angeles-type rotating drum. The weight loss of each test piece is measured after a fatigue test. The smaller the loss, the more the coated material is considered as resistant. The results presented in table IV put in evidence better behaviour of the bituminous-coated material of the invention during his test than other bituminous-coated materials used before the invention.
Besides, noise measurements have been conducted on various test sections corresponding to city roads and intercity links.
The principle adopted consists in comparing two coatings together. For instance, the former coating of the carriageway and the new coating according to the invention, or different coatings on the same itinerary, are compared to one another. The measurements were taken according to the so-called 'near field' method, which consists in measuring the noise generated by a running light vehicle, using an on-board microphone placed close to a wheel, away from the noises produced by the engine and the exhaust.
The running noise (noise generated, less noise absorbed) is then measured while ignoring the other sources of noise located much further. Such a method therefore enables characterisation of a coating, even on a city site, independently from its environment.
This test has been developed by the Laboratoire R6gional de I'Est Parisien, who has conducted the measurements whose results are presented thereunder.
In a city, the reference speed is 50 km/h. Three sections have been measured. The results are as follows: Noise level 1 m from the wheel at 50 km/h Building site Former coatin Coated material of the invention Gain 1 90.20 dBA 83.5 dBA 6.7 2 88.56 dBA 83.58 dBA 4.98 3 90.14 dBA 83.52 dBA 6.62 The gains are significantly greater than 4 dBA, which corresponds to a noise reduction of more than On a section of a B-type road, the carpet applied is a conventional bituminous concrete 0/10. However, the portion going through a hamlet has been treated with a coated material according to the invention.
The measurements are taken at 90 km/h on this type of test road.
Coating Noise level 1 m from the Gain with the coated wheel at 90 km/h material of the invention Coated material of the 93.6 dBA invention New bituminous 96.5 dBA 2.9 dBA concrete Older bituminous 98.1 dBA 4.5 dBA concrete The coated material according to the invention enables gaining more than 4 dBA with respect to an older coating and 3 dBA with respect to a new bituminous concrete 0/10.
The manufacture of the bituminous-coated material according to the invention can be made in discontinuous plants or, alternatively, in continuous plants using a drum-drier-mixer represented, for exemplification purposes, on the single Figure.
In a plant fitted with a drum-drier-mixer, the bituminous coated material of the invention is obtained by the following stages: dosing the granulates, Sadding a make-up filler, drying these materials, dosing a bitumen and adding 11 this bitumen to the granulates, dosing and adding rubber powder, mixing all the materials and dedusting the bituminous coated material provided.
In the drum-drier-mixer 1, the mixture of stone chippings and make-up filler is dried and then mixed with bitumen from a binder storage tank and with rubber from a hopper 2. The rubber and the bitumen are advantageously added to the mixture using two lances 3, 4 whose output nozzles are arranged upstream of a recycling ring 5, and mixed with all the components of the bituminous coated material.
TABLE I RECOMPOSITION ACCORDING TO IDENTIFICATION Example: COATED MATERIALS 0.10 at 1% rubber
FORMULATION
COMPOSITION
STATION
6/10 NOUBLEAU 79.0 SPECIFIC SURFACE: 13.763 cm 2 /g CEMENT PERCENTILE: 3.894 0/2 NOUBLEAU 17.0 THEORETICAL DENSITY: 2.554 g/cm3 FILLER PIKETTY 3.0 M.V.R. AGGREGATES: 2.812 cm3/g Rubber 0/1 1.0 Binder: COLFLEX N 6.20 COATING TEMPERATURE: 170°C SIZE DISTRIBUTION in mass (NF P 18-560) SIEVE UNDER- 6/10 /2 FILLER Rubber 0 SIZE NOUBLEAU NOUBLEAU PIKE 100.0 100.0 100.0 100.0 100.0 14 100.0 100.0 100.0 100.0 100.0 12.5 100.0 100.0 100.0 100.0 100.0 90.0 87.4 100.0 100.0 100.0 8 56.5 44.9 100.0 100.0 100.0 6.3 29.7 11.0 100.0 100.0 100.0 4 21.9 1.2 100.0 100.0 100.0 2 20.3 0.8 92.4 100.0 100.0 1 16.1 0.7 67.8 100.0 99.9 11.5 0.7 43.3 100.0 61.1 0.315 9.7 0.6 34.8 100.0 26.6 0.2 8.1 0.6 26.4 100.0 9.6 0.08 6.1 0.6 17.0 90.0 0.7 M.V.R. g 2.812 2.856 1.000 2.820 2.700 1.000 1,000 SIZE DISTRIBUTION IN VOLUME Volume proportion 77.26 16.84 3.10 2.79 SIEVE UNDER- 6/10 /2 FILLER Rubber 0 SIZE NOUBLEAU NOUBLEAU PIKE 100.0 100.0 100.0 100.0 100.0 14 100.0 100.0 100.0 100.0 100.0 12.5 100.0 100.0 100.0 100.0 100.0 90.3 87.4 100.0 100.0 100.0 8 57.4 44.9 100.0 100.0 100.0 6.3 31.2 11.0 100.0 100.0 100.0 4 23.7 1.2 100.0 100.0 100.0 2 22.1 0.8 92.4 100.0 100.0 1 17.9 0.7 67.8 100.0 99.9 12.6 0.7 43.3 100.0 61.1 0.315 10.2 0.6 34.8 100.0 26.6 0.2 8.3 0.6 26.4 100.0 9.6 0.08 6.1 0.6 17.0 90.0 0.7 M.V.R. g 2.812 2.856 1.000 2.820 2.700 1.000 1.313 Volume proportion of bitumen 16.81 414 TABLE 11 RECOMPOSITION ACCORDING TO IDENTIFICATION Example: COATED MATERIALS 0.10 at 1.5% rubber
FORMULATION
COMPOSITION
STATION
6/10 NOUBLEAU 79.0 SPECIFIC SURFACE: 15.428 CM 2 fg CEMENT PERCENTILE: 3.969 0/2 NOUBLEAU 17.0 THEORETICAL DENSITY. 2.532 glcm3 FILLER PIKETTY 2.5 M.V.R. AGGREGATES: 2.797 cm3/g Rubber 0/1 1.5 Binder: COLFLEX N 6.50 COATING TEMPERATURE: 170'C SIZE DISTRIBUTION in mass (NF P 8-560) SIEVE UNDER- 6/10 /2 FILLER Rubber 0 SIZE NOUBLEAU NOUBLEAU PIKE 100.0 100.0 100.0 100.0 100.0 14 100.0 100.0 100.0 100.0 100.0 12.5 100.0 100.0 100.0 100.0 100.0 90.0 87.4 100.0 100.0 100.0 8 56.5 44.9 100.0 100.0 100.0 6.3 29.7 11.0 100.0 100.0 100.0 4 21.9 1.2 100.0 100.0 100.0 2 20.3 0.8 92.4 100.0 100.0 1 16.1 0.7 67.8 100.0 99.9 11.3 0.7 43.3 100.0 61.1 0.315 9.3 0.6 34.8 100.0 26.6 0.2 7.6 0.6 26.4 100.0 9.6 0.08 5.6 0.6 17.0 90.0 0.7 M.V.R. g 2.797 2.856 11.000 2.820 2.700 11.000 11.000 SIZE DISTRIBUTION IN VOLUME Volume proportion 76.59 16.69 2.56 4.15 SIEVE UNDER- 6/10 /2 FILLER RubberO NOUBLEAU NOUBLEAU PIKE 100.0 100.0 100.0 100.0 100.0 14 100.0 100.0 100.0 100.0 100.0 12.5 100.0 100.0 100.0 100.0 100.0 90.3 87.4 100.0 100.0 100.0 8 57.8 44.9 100.0 100.0 100.0 6.3 31.8 11.0 100.0 100.0 100.0 4 24.3 1.2 100.0 100.0 100.0 2 22.8 0.8 92.4 100.0 100.0 1 18.6 0.7 67.8 100.0 99.9 12.9 0.7 43.3 100.0 61.1 0.315 9.9 0.6 34.8 100.0 26.6 0.2 7.8 0.6 26.4 100.0 9.6 0.08 5.6 0.6 17.0 90.0 0.7 M. V.R. g 2.797 2.856 100 2.820 2.700 -1.000 1.313 Volume proportion of bitumen 17.47 TABLE III Comparison between two coated materials of the invention With 1 and 2 KU GRANULATE KU binder r/R K Quartzite Brix 2 6.6 0.84 3.669 Quartzite Brix 1 6.6 0.97 3.88 Diorite Meilleraie 2 6.1 0.79 3.7 Diorite Meilleraie 1 6.1 0.87 3.868 Diorite Noubleau 2 6.5 0.86 3.861 Diorite Noubleau 1 6.2 0.93 3.894 Sandstone Vaubadon 2 6.3 0.77 3.6 Sandstone Vaubadon 1 6.4 0.87 3.837 Quartzite Vignats 2 6.6 0.84 3.61 Quartzite Vignats 1 6.6 0.94 3.819 Porphyry Voutr6 2 7 0.8 3.865 Porphyry Voutre 1.5 6.9 0.83 3.881 Porphyry Voutr6 1.2 7 0.88 4.035 KU thin rubber powder r/R coefficient of Duriez reduction K cement percentile calculated according to the method of the invention TABLE IV Bitum. coated material Bitum. coated material (B)
COMPOSITION
6/10 Brix 78.5 83.0 0/2 Brix 12.0 0/2 Brix 17.0 Filler 3.5 3.0 Rubber 0/1 1.0 2.0 Bitumen 60/70 6.60 6.60 DURIEZ Hydrostatic density 2.263 g/cm3 2.044 g/cm3 Compacity 94.5 86.2 WATER Rc 9.2 MPa 5.9 MPa AIR Rc 8.9 MPa 4.9 MPa Reduction coef. r/R 0.97 0.84 Absorbed water 1.5 3.8 CANTABRO Geo. compacity 89.1 Hydro. compacity 93.7 Wear 9.3 Simple DURIEZ-LCPC compression test according to NF P98-251-1 CANTABRO test according to the Spanish standard NLT 352/86 16 TABLE IV (continued) SIZE DISTRIBUTION RECOMPOSITION Undersize (in mass) SIEVE mm Bituminous coated Bituminous coated material material (B) 100.0 100.0 14 100.0 100.0 12.5 100.0 100.0 93.6 92.5 8 56.9 51.9 6.3 29.5 24.0 4 22.7 18.1 2 19.6 16.0 1 15.4 13.1 0.5 11.8 9.8 0.315 9.6 7.8 0.2 8.1 6.6 0.08 5.9 5.3 "Comprises/comprising" when used in this specification is taken to specify 5 the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

Claims (9)

1. A hot bituminous coated material intended for making a road carpet and comprising to that effect a granular mixture with discontinuous size and, by way of a binder, bitumen, whereas the granular mixture comprises as components i, stone chippings, a sand fraction and rubber powder, whereby the sand fraction and the rubber powder taken together have a volume smaller than the interstitial volume of the stone chippings, characterised in that the particle size of the rubber powder is smaller than mm and in that the rubber percentage in the granular mixture is smaller than in mass and the size distribution of the granular mixture is calculated according to the formula: Bj )Zi (Aij .Vi))/100 where o o Bj: percentage of undersizes in volume of the mixture through a sieve j, S"Aij: percentage of undersizes in mass of the component i through the sieve j, Vi: volume proportion of the component i.
2. A coated material according to claim 1, characterised in that the particle size of the rubber powder is smaller than 1 mm for 90% of the particles. .i
3. A coated material according to claim 1, characterised in that the rubber percentage in the granular mixture ranges from 0.5 to 1%.
4. A coated material according to any of the claims 1 to 3, characterised in that the bitumen content L of the total mass of the coated material is determined according to the formula L=K. a. s4Y where K represents a cement percentile K with a value ranging from 3.5 to a is a correcting coefficient of the actual density Vi of the components i and Z represents a conventional specific surface of the components i, whereas this 18 specific surface Z is obtained using the definition 100 Y 0.25 G 2.3 S 12 s 135 f 450 KU with the following weighting proportions: G grains larger than 6.3 mm S grains from 6.3 mm to 0.315 mm s grains from 0.315 mm to 0.08 mm f grains smaller than 0.08 mm KU rubber particles.
A coated material according to claim 4, characterised in that the cement percentile K has a value ranging from 3.8 to 4.2.
6. A method of manufacture of a hot bituminous coated material intended for making a road carpet and comprising a granular mixture with discontinuous size and, by way of a binder, a bitumen, whereas the granular mixture comprises .o stone chippings, a sand fraction and rubber powder, whereby the process comprises the following stages: bringing the stone chippings and the sand fraction to the coating temperature and mixing them with the binder in order to produce the bituminous coated material, characterised in that the rubber percentage is added with a percentage smaller than 1.5% in the volume of the granular mixture, whereas the size of the particles of the rubber powder is smaller than 1.5 mm.
7. A method according to claim 6, characterised in that the rubber powder is pre-treated by bitumen micronisation and in that the quantity of bitumen adding during the mixing process is corrected in order to take into account the bitumen content of the micronised rubber powder.
8. A method according to claim 6 or 7, characterised in that, before the rubber powder is added to the mixture of stone chippings and the sand fraction, its humidity ratio is measured and then, if needed, corrected in order not to exceed 1% in mass. 19
9. A method of manufacture of a road carpet with a bituminous coated material according to any of claims 1 to 5 obtained by implementing a method of manufacture according to any of the claims 6 to 8, comprising the following stages: application of a hooking layer onto the road intended for receiving the carpet, application of one layer of the said bituminous coated material and compacting this bituminous coated layer. DATED this 10 th day of May 2002 COLAS WATERMARK PATENT TRADE MARK ATTORNEYS GPO BOX 2512 PERTH WA 6001 AUSTRALIA .C P19652AU00 CJH/TJB/JAM
AU43024/00A 2000-01-07 2000-04-21 Hot-setting bitumen-coated material containing rubber Ceased AU749952B2 (en)

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AU2002301279A AU2002301279B2 (en) 2000-01-07 2002-09-27 A hot bituminous rubber-containing coated material, a method of manufacture of such a coated material and a method of realisation of such a road carpet with such a coated material

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0000196A FR2803608A1 (en) 2000-01-07 2000-01-07 HOT BITUMINOUS RUBBER COMPRISING RUBBER, PROCESS FOR PRODUCING THE SAME, AND PROCESS FOR PRODUCING A ROLLING LAYER WITH SUCH AN INHIBIT
FR00/00196 2000-01-07
PCT/FR2000/001069 WO2001049939A1 (en) 2000-01-07 2000-04-21 Hot-setting bitumen-coated material containing rubber

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FR2852018B1 (en) 2003-03-07 2005-04-29 BITUMINOUS BINDER AND PROCESS FOR PREPARING IT.
CN100340610C (en) * 2004-10-29 2007-10-03 中国石油化工股份有限公司 Waste rubber powder modified asphalt composition and its preparation method

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4548962A (en) * 1981-12-29 1985-10-22 All Seasons Surfacing Corporation Rubberized asphaltic concrete composition
US5436285A (en) * 1991-06-05 1995-07-25 Causyn; David Recycled rubber in a polymer modified asphalt and a method of making same
EP0672791A1 (en) * 1994-03-18 1995-09-20 Colas S.A. Hot bituminous road covering comprising recycled rubber

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EP0056044A1 (en) * 1980-07-21 1982-07-21 HOPGOOD DUNSTAN & PARTNERS PTY. LTD. A method and means for introducing fine particulate material

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4548962A (en) * 1981-12-29 1985-10-22 All Seasons Surfacing Corporation Rubberized asphaltic concrete composition
US5436285A (en) * 1991-06-05 1995-07-25 Causyn; David Recycled rubber in a polymer modified asphalt and a method of making same
EP0672791A1 (en) * 1994-03-18 1995-09-20 Colas S.A. Hot bituminous road covering comprising recycled rubber

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HUP0203927A2 (en) 2003-03-28
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WO2001049939A1 (en) 2001-07-12
CA2396528A1 (en) 2001-07-12
FR2803608A1 (en) 2001-07-13
SK9902002A3 (en) 2003-07-01
CZ20022334A3 (en) 2003-06-18
EP1248884A1 (en) 2002-10-16

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