EP0424213A1 - Verfahren zur Verzögerung der Ausbreitung von Rissen in Asphaltbetondecken und dazu verwendbare vorgefertigte Asphaltfolie - Google Patents

Verfahren zur Verzögerung der Ausbreitung von Rissen in Asphaltbetondecken und dazu verwendbare vorgefertigte Asphaltfolie Download PDF

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Publication number
EP0424213A1
EP0424213A1 EP90402814A EP90402814A EP0424213A1 EP 0424213 A1 EP0424213 A1 EP 0424213A1 EP 90402814 A EP90402814 A EP 90402814A EP 90402814 A EP90402814 A EP 90402814A EP 0424213 A1 EP0424213 A1 EP 0424213A1
Authority
EP
European Patent Office
Prior art keywords
sheet
polymer
bitumen
reflective cracking
damaged
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90402814A
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English (en)
French (fr)
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EP0424213B1 (de
Inventor
Nathan Livnat
Gregori Svechinsky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PAZKAR Ltd
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PAZKAR Ltd
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Filing date
Publication date
Application filed by PAZKAR Ltd filed Critical PAZKAR Ltd
Publication of EP0424213A1 publication Critical patent/EP0424213A1/de
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Publication of EP0424213B1 publication Critical patent/EP0424213B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • E01C7/187—Repairing bituminous covers, e.g. regeneration of the covering material in situ, application of a new bituminous topping

Definitions

  • the present invention relates to improvements in the methods for repairing roads. More particularly, the invention relates to a method for delaying reflective cracking in asphalt concrete pavements.
  • the primary function of a pavement as a structure is to transmit the loads imposed by vehicles to the subgrade under the roadway in such a manner that the soil mass remains stable, i.e. does not exhibit detrimental deformation or does not rupture.
  • the wearing surface of the pavement structure must resist the abrasive action of moving traffic and must provide acceptable riding qualities.
  • the pavement structure and its components also must resist the dete­ riorating influences of temperature and moisture change and various induced chemical reactions.
  • pavement is generally used to include the top layer which provides the riding surface and the layered system comprising the wearing course and the subgrade also known as natural subgrade soil.
  • Asphaltic concretes are more frequently used. They consist of mix­tures containing the harder grades of asphalt and high quality densely graded aggregates which are processed in a hot-mix plant. The mixtures are used for heavy-duty bituminous pavements and placed by paving machines pro­ducing a uniform surface having good riding qualities.
  • the invention consists of a method for rehabilitation of roads suffering from reflective cracking, which comp­rises the hot welding onto the damaged pavement of a pre­fabricated sheet having a thickness of at least 0.5 mm, said sheet consisting of an upper and lower layer of polymer-modified bitumen, said layers being separated by a stress relieving reinforced elastic membrane which is characterized by an elongation of between 30% to 70% and tensile strength of at least 5 kg/cm.
  • the thickness of the sheet is generally up to 10 mm, although a thicker one could also be useful, but of course will be more ex­pensive. The most preferred thickness will be in the range of 3 to 5 mm being most desirable from an economical point of view.
  • the reinforcement of the membrane may be obtained by any solid material such as woven or non-woven fabric, fiber glass, or even metal wires, to an extent that it will not affect the visco-elastic property of the membrane, which is one of its main characteristics.
  • the thermal and the shrinkage effects caused by the surrounding temperature gradient recognized to be one of the main factors which cause reflective cracking, are substantially eliminated due to the elasticity of said membrane.
  • the use of this membrane also avoids the reflective cracking caused by the traffic loading. Tests carried out with prefabricated sheets obtained according to the pre­sent invention, show that no reflective cracking appears even after 5 years.
  • the use of the prefabricated sheets made according to the present invention avoids the use of increased thick layers - upper and lower ones - which were thought that to remedy to a certain extent, the reflective cracking in the existing pavements.
  • the upper and lower layers, at the two sides of the rein­forced membrane consist of bitumen modified by a polymer at an amount of at least 2% by weight of the bitumen and preferably in the range of 4% to 10%.
  • the added polymer modifies the bitumen by imparting to it visco-elastic properties which enable elongation of the bitumen above 100% and even up to 1500% without cracking.
  • the polymer to be used may be selected from any elastomer and prefe­rably from a thermoplastic rubber such as styrene-butadi­ene-styrene rubber, styrene-isoprene- styrene rubber, a polyolefin such as polypropylene, polyethylene, or any other common polymer possessing elastomeric properties being suitable for blending with bitumen.
  • a thermoplastic rubber such as styrene-butadi­ene-styrene rubber, styrene-isoprene- styrene rubber, a polyolefin such as polypropylene, polyethylene, or any other common polymer possessing elastomeric properties being suitable for blending with bitumen.
  • One of the advantages of the method is the use of prefab­ricated sheets.
  • the sheet is laid onto the road on which a rehabilitation due to the reflective cracking is required, and there it is bonded to the damaged pavement.
  • This bonding can be easily obtained by hot welding and most preferably torching-on with an open flame.
  • a strong bonding is obtained in view of the bitu­men constituent present on the pavement as well as on the lower layer of the prefabricated sheet.
  • the upper layer also consists of a polymer modified bitu­men. This layer should behave independently from the lower layer. It should also possess a large flexibility to sustain large horizontal movements and a high shear resistance.
  • prefabricated sheets to be used for repairing pavements suffering from reflective cracking there are provided prefabricated sheets to be used for repairing pavements suffering from reflective cracking.
  • the prefabricated sheet having a thickness of at least 0.5 mm is made from an upper and lower layer of a polymer modified bitumen, said layers being separated by a stress relieving reinforced elastic membrane which is characte­rized by an elongation of between 30% to 70% and tensile strength of at least 5 kg/cm.
  • the prefabricated sheet is made by immersing a fabric sheet through a bath heated to about 120 - 190 o C containing a polymer-modified-bitu­men and also a filler.
  • the filler is any inert constituent, added in amounts of between 5% to 25% from the bath content, its main purpose being to decrease the costs thereof. Typical examples of such inert fillers are calcium carbonate, dolomite, quartz, etc.
  • the sheet is conveyed through the hot bath containing the polymer-modified-bitumen through rolls at a velocity of between 10 to 20 m/min.
  • the hot modified bitumen penetra­tes through the fibers of the fabric imparting to them adhesive property. According to a most preferred embodi­ment, it is suggested to carry out an impregnation prior to the immersion in the hot bath, which will enchance the adhesiveness of the sheet to the old pavement on the damaged road.
  • the approach of the present invention for rehabilitation of pavement damaged by reflective cracking is based on providing a particular type of modified bitu­men stress relieving reinforced elastic membrane, which covers the old deteriorated pavement in such a way that it will not undergo further crackings due to shrinkage, will take advantage of constrained shrinkage stresses and will close existing cracks in the old pavement, thus producing a new bearing layer of even surface on the old structure.
  • the method is very simple and by using the pre-fabricated sheets it contributes to the economy of this treatment.
  • a felt sheet having a thickness of 0.5 mm,was conveyed through a hot bath, maintained at about 150 o C,containing Styrene-Butadiene-Styrene (SBS) modified bitumen.
  • SBS Styrene-Butadiene-Styrene
  • the amount of SBS was 6% of the bitumen.
  • the bitumen used had a penetration of 200 according to ASTM D-5.
  • the bath also contains 25% of powdered calcium carbonate.
  • the sheet was conveyed through the bath at a velocity of about 15 m/min,hus obtaining the prefabricated sheet containing the polymer-modified bitumen astthe upper and lower layers.
  • the type of bitumen can be selected according to the particular pavement to be rehabilitated and the climate prevailing thereto.
  • the felt sheet as in the previous Example, was conveyed through a hot bath containing polypropylene (a mixture of atactic and isotactic)-modified bitumen.
  • the amount of polypropylene was about 15% of the bitumen.
  • the bitumen used had a penetration of 65 (ASTM, D-5).
  • the bath also contained 15% of powdered quartz as filler.
  • the sheet was conveyed through the bath at a velocity of about 20 m/min thus obtaining the prefabricated sheet containing the polymer-modified bitumen as the upper and lower layers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
EP90402814A 1989-10-19 1990-10-09 Verfahren zur Verzögerung der Ausbreitung von Rissen in Asphaltbetondecken und dazu verwendbare vorgefertigte Asphaltfolie Expired - Lifetime EP0424213B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL92050A IL92050A (en) 1989-10-19 1989-10-19 Method of delaying reflective cracking propagation in asphalt concrete overlays and prefabricated sheet to be used therewith
IL92050 1989-10-19

Publications (2)

Publication Number Publication Date
EP0424213A1 true EP0424213A1 (de) 1991-04-24
EP0424213B1 EP0424213B1 (de) 1994-03-16

Family

ID=11060496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402814A Expired - Lifetime EP0424213B1 (de) 1989-10-19 1990-10-09 Verfahren zur Verzögerung der Ausbreitung von Rissen in Asphaltbetondecken und dazu verwendbare vorgefertigte Asphaltfolie

Country Status (3)

Country Link
EP (1) EP0424213B1 (de)
DE (1) DE69007416T2 (de)
IL (1) IL92050A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8658717B2 (en) 2011-01-28 2014-02-25 Honeywell International Inc. Asphalt paving materials and methods for making the same
US10584247B2 (en) 2012-12-28 2020-03-10 Honeywell International Inc. Methods for reducing asphalt pavement thickness
CN114002094A (zh) * 2021-12-29 2022-02-01 山东高速集团有限公司 一种用于预测路面结构疲劳损伤的系统及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428698A (en) * 1980-08-21 1984-01-31 Murphy Jerry C Geotextile for pavement overlays
US4637946A (en) * 1985-11-18 1987-01-20 Owens-Corning Fiberglas Corporation Road repair membrane
DE8706890U1 (de) * 1987-05-14 1987-10-22 Modzel, Willy, Dipl.-Ing., 4370 Marl Vorgefertigte Dünnschichtbahn aus bitruminösen Straßenbaustoffen mit zugfester Einlage
EP0318707A1 (de) * 1987-11-04 1989-06-07 Bay Mills Limited Vorgefertigte Bewehrung für Asphaltbeläge und Verfahren zum Herstellen bewehrter Strassendecken

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428698A (en) * 1980-08-21 1984-01-31 Murphy Jerry C Geotextile for pavement overlays
US4637946A (en) * 1985-11-18 1987-01-20 Owens-Corning Fiberglas Corporation Road repair membrane
DE8706890U1 (de) * 1987-05-14 1987-10-22 Modzel, Willy, Dipl.-Ing., 4370 Marl Vorgefertigte Dünnschichtbahn aus bitruminösen Straßenbaustoffen mit zugfester Einlage
EP0318707A1 (de) * 1987-11-04 1989-06-07 Bay Mills Limited Vorgefertigte Bewehrung für Asphaltbeläge und Verfahren zum Herstellen bewehrter Strassendecken

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8658717B2 (en) 2011-01-28 2014-02-25 Honeywell International Inc. Asphalt paving materials and methods for making the same
US10584247B2 (en) 2012-12-28 2020-03-10 Honeywell International Inc. Methods for reducing asphalt pavement thickness
CN114002094A (zh) * 2021-12-29 2022-02-01 山东高速集团有限公司 一种用于预测路面结构疲劳损伤的系统及方法

Also Published As

Publication number Publication date
DE69007416D1 (de) 1994-04-21
DE69007416T2 (de) 1994-06-30
IL92050A (en) 1991-06-10
IL92050A0 (en) 1990-07-12
EP0424213B1 (de) 1994-03-16

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