Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C11/00—Details of pavings
  • E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
  • E01C11/224—Surface drainage of streets
  • E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
  • E01C11/226—Coherent pavings
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
  • E01C7/182—Aggregate or filler materials, except those according to E01C7/26

Definitions

• the present invention relates to a double layer draining and sound-absorbing wearing course, its use in motor racing circuits and road paving, means and method for its preparation.
• the wearing courses used in motor racing circuits, highways, national and urban roads with heavy traffic require good mechanical properties, a high grip and sur- face regularity. These properties are traditionally obtained using "closed” wearing courses, i.e. with reduced content of residual voids. This solution however is of no help during rainfall.
• Draining pavements are mainly characterized by a high percentage of residual voids (>18%) obtained by adopting inert products with a discontinuous granu- lometric curve which ensures, with respect to a closed pavements, the following advantages: improvement in tyre grip on wet surfaces; decrease in water spray generated by tyres in the case of rain; - elimination of aquaplaning; reduction in the sound level outside the car owing to the absorption of acoustic energy; reduction in the luminous reflection at night.
• modified bitumens having a reduced thermal susceptibility, high elasticity, high tack to inert products and good aging resistance, com- bined with this double-layered structure, allows the following advantages to be obtained:
• an objective of the pres- ent invention relates to a double layer draining and sound-absorbing wearing course made up of: (1) an upper layer having a thickness ranging from 2 to 5 cm consisting of a bituminous conglomerate which com ⁇ prises : (a) a stone aggregate consisting of elements with dimensions ranging from 0.075 to 10 mm in a quantity ranging from 88 to 98% by weight;
• (c') a bituminous ligand having the characteristics indicated in table 2 in a quantity ranging from 3.5 to 5.5% by weight with respect to the sum of components (a' ) and (b 1 ) .
• the upper layer of the draining and sound-absorbing wearing course preferably has a thickness ranging from 2.5 to 4 cm and consists of:
• the lower layer of the draining and sound-absorbing wearing course preferably has a thickness ranging from 3 to 7 cm and consists of:
• (a 1 ) a stone aggregate consisting of elements with dimensions ranging from 0.125 to 15 mm in a quantity ranging from 90 to 95% by weight;
• (c') a bituminous ligand having the characteristics indicated in table 2 in a quantity ranging from 4 to 5% by weight with respect to the sum of components (a 1 ) and (b') .
• the stone aggregates which can be used consist of healthy, hard granular elements, in a non-flattened, elongated or lenticular form, clean and without foreign matter, according to regulation C.N.R. 139/1992.
• the fillers are those conventionally used for the production of conglomerates. They are generally powders with a particle size of less than 0.125 mm.
• fillers suitable for the purpose of the present invention comprise calcium carbonate and cement.
• the bituminous ligand is selected from modified bi- tumens having the characteristics indicated in table 2. Table 2
• a modified bitumen containing SBS (styrene-butadiene-styrene) polymers obtained, for example, as described in U.S. patent 5,756,563, or, for example of the type sold by AGIP
• PETROLI S.p.A. under the trade-name of ELIFLEX ® .
• the sound-absorbency characteristics are not only indicate a decrease in noise outside the vehicle, but also a reduction thereof inside the vehicle of over 3 decibel.
• the bituminous conglomerate which forms a further objective of the present invention, is prepared under heating in a suitable plant by putting the stone aggregate, the bitumen and filler in contact with each other in the appropriate quantities .
• the temperature and mixing time are generally selected in relation to the materials and climatic conditions during the laying. In any case, the mixing conditions are selected so as to obtain a conglomerate having an adequate laying temperature to allow effective roll- ing .
• the pavement of the present invention is prepared by:
• (a 1 ) a stone aggregate consisting of elements with dimensions ranging from 0.125 to 20 mm in a quantity ranging from 85 to 98% by weight; (b') a filler in a quantity ranging from 2 to 15% by weight; (c 1 ) a bituminous ligand having the characteristics indicated in table 2 in a quantity ranging from 3.5 to 5.5% by weight with respect to the sum of components (a' ) and (b* ) ; and (ii) the curing of this first layer; and
• a water-proofing membrane is then laid on top of the base layer to protect it from the infiltration of rain water.
• This membrane consists of modified bitumen, pref- erably a bitumen identical to that used for the preparation of the conglomerates, suitably saturated with grit or filler.
• bituminous conglomerate is then laid on top of this membrane to obtain a first lower layer having the characteristics described above.
• bituminous conglomerate is laid using slightly staggered vibratory finishers in parallel thus avoiding, or in any case reducing, longitudinal joints. These should be particularly treated (flanking and compaction) to avoid stagnation of rain or reduction in the draining capacity.
• the rolling is carried out using the conventional techniques .
• the draining and sound-absorbing wearing course of the present invention is particularly suitable for the paving of motor racing cirsuits and heavy traffic roads.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Structures (AREA)
• Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Detergent Compositions (AREA)
• Gloves (AREA)
• Railway Tracks (AREA)
• Platform Screen Doors And Railroad Systems (AREA)
• Moving Of Heads (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Paints Or Removers (AREA)
• Medicinal Preparation (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11382254

Family Applications (1)

Country Status (9)

Cited By (3)

Citations (2)

• 1999
  • 1999-03-12 IT IT1999MI000503A patent/IT1311890B1/it active
• 2000
  • 2000-03-08 AT AT00915174T patent/ATE294899T1/de active
  • 2000-03-08 WO PCT/EP2000/002046 patent/WO2000055428A1/en active IP Right Grant
  • 2000-03-08 DE DE60019858T patent/DE60019858T2/de not_active Expired - Lifetime
  • 2000-03-08 EP EP00915174A patent/EP1078129B1/en not_active Expired - Lifetime
  • 2000-03-08 AU AU36577/00A patent/AU3657700A/en not_active Abandoned
  • 2000-03-08 PT PT00915174T patent/PT1078129E/pt unknown
  • 2000-03-08 ES ES00915174T patent/ES2237416T3/es not_active Expired - Lifetime
  • 2000-03-08 HU HU0102081A patent/HU227312B1/hu not_active IP Right Cessation

Patent Citations (2)

Non-Patent Citations (1)

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