EP0560864B1 - Method for removing old asphalt concrete from a road - Google Patents

Method for removing old asphalt concrete from a road Download PDF

Info

Publication number
EP0560864B1
EP0560864B1 EP92900830A EP92900830A EP0560864B1 EP 0560864 B1 EP0560864 B1 EP 0560864B1 EP 92900830 A EP92900830 A EP 92900830A EP 92900830 A EP92900830 A EP 92900830A EP 0560864 B1 EP0560864 B1 EP 0560864B1
Authority
EP
European Patent Office
Prior art keywords
asphalt concrete
road
open
old asphalt
old
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.)
Expired - Lifetime
Application number
EP92900830A
Other languages
German (de)
French (fr)
Other versions
EP0560864A1 (en
Inventor
Andreas Goverdina Kemps
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.)
Hollandsche Beton Groep NV
Original Assignee
Hollandsche Beton Groep NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hollandsche Beton Groep NV filed Critical Hollandsche Beton Groep NV
Publication of EP0560864A1 publication Critical patent/EP0560864A1/en
Application granted granted Critical
Publication of EP0560864B1 publication Critical patent/EP0560864B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • 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
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, 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
    • E01C19/10—Apparatus 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
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
    • 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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/14—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces for heating or drying foundation, paving, or materials thereon, e.g. paint

Definitions

  • the invention relates to a method for removing old asphalt concrete from a road, comprising: heating the asphalt concrete to soften the binding materials (bitumes plus additives) of the aggregates, and removing the asphalt concrete softened in this way by using a slide or shovel.
  • the aim of the invention is to overcome the above mentioned disadvantage and to this end to heat the asphalt concrete, steam having a temperature of at least 105°C, is blown onto the asphalt concrete.
  • softening can be achieved to an extent such that the asphalt concrete can be pushed off and removed without crushing of the stone fraction of the old asphalt concrete and without emission of hazardous gases, the particle size distribution of the stone fraction undergoing no change.
  • Mechanical crushing or milling can be dispensed with.
  • GB-A-292502 discloses an improved process for cleaning and heating the surface of road utilizing a steam jet under pressure for driving away the dust and sand and for heating the road. This publication does not give any indication that the steam is used to soften old asphalt to facilitate its removal. The main aim of this known process is to facilitate the application of coatings or dressing of tar, bitumes or other materials that is intended to adhere strongly to the understructure.
  • the invention is outstandingly suitable for the removal of a layer of very open asphalt concrete lying on a layer of dense asphalt concrete, the layer of very open asphalt concrete being softened by the steam and the very open asphalt concrete softened in this way is pushed off and removed using a slide or shovel, while the dense layer of asphalt concrete, which is more difficult to heat, remains behind.
  • the 4 to 5 cm thick top layer of very open asphalt concrete takes up the heat originating from the heated steam much more rapidly than the layer of dense asphalt concrete below it.
  • the relatively expensive open top layer having a very specific particle size distribution can then also be processed separately to give new very open asphalt concrete. The invention thus makes it possible to remove the open top layer without damaging the dense underlayer.
  • An essential feature of the invention is that old asphalt layers can be removed rapidly and effectively without emission of hazardous gases and without stone dust being formed as a result of crushing and with retention of the original particle size distribution, by means of treating with steam and pushing off mechanically using a slide or shovel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Road Repair (AREA)
  • Processing Of Solid Wastes (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

In order to remove old asphalt concrete from a road without crushing the stone fraction thereof and without emission of harmful gases, superheated steam is blown onto the old asphalt concrete and the asphalt concrete softened in this way is pushed off and removed using a slide or shovel.

Description

  • The invention relates to a method for removing old asphalt concrete from a road, comprising:
    heating the asphalt concrete to soften the binding materials (bitumes plus additives) of the aggregates, and removing the asphalt concrete softened in this way by using a slide or shovel.
  • A method of this kind is disclosed in US-A-4226552.
  • It is known to divide old asphalt concrete, which has to be replaced by new, into manageable lumps and fragments using crushing machines or milling machines and to remove said lumps and fragments using a mechnical shovel. A disadvantage of this method is that, as a result of the crushing of the stone fraction of the old asphalt concrete, the particle size distribution of said fraction is changed, that is to say the proportion of the finer fraction increases.
  • According to US-A-4226552 this disadvantage is avoided by using a hood lined with refractory having an open bottom that is supported in spaced relation to the top of the pavement surface and has associated gas burners to heat the inside of the hood which in turn radiates substantial heat down on the pavement to penetrate the top surface of the pavement to a substantial depth. An important disadvantage of this known method is the emission of carcinogenic gases. Further the binding materials of the old asphalt concrete are partially desintegrated by the higher radiation and gas temperatures so that expensive new binding materials must be added to make a proper new asphaltic mixture.
  • The aim of the invention is to overcome the above mentioned disadvantage and to this end to heat the asphalt concrete, steam having a temperature of at least 105°C, is blown onto the asphalt concrete.
  • By using the invention softening can be achieved to an extent such that the asphalt concrete can be pushed off and removed without crushing of the stone fraction of the old asphalt concrete and without emission of hazardous gases, the particle size distribution of the stone fraction undergoing no change. Mechanical crushing or milling can be dispensed with.
  • GB-A-292502 discloses an improved process for cleaning and heating the surface of road utilizing a steam jet under pressure for driving away the dust and sand and for heating the road. This publication does not give any indication that the steam is used to soften old asphalt to facilitate its removal. The main aim of this known process is to facilitate the application of coatings or dressing of tar, bitumes or other materials that is intended to adhere strongly to the understructure.
  • There is an ever increasing tendency to produce the top layer of an asphalt road from very open asphalt concrete, that is asphalt concrete which, as a result of the choice of a specific particle size distribution, has 20 to 25% cavities which ensure perfect drainage. Crushing of the stone fraction of the very open asphalt concrete by crushing or milling results in a substantial increase in the proportion of fine particles and in it therefore no longer being possible to process the removed old asphalt concrete into a new mixture which is able to form a layer of very open asphalt concrete. An other drawback of crushing or milling is the dust formation, mainly caused by crushing of the stone fraction.
  • The invention is outstandingly suitable for the removal of a layer of very open asphalt concrete lying on a layer of dense asphalt concrete, the layer of very open asphalt concrete being softened by the steam and the very open asphalt concrete softened in this way is pushed off and removed using a slide or shovel, while the dense layer of asphalt concrete, which is more difficult to heat, remains behind.
  • Indeed, as a consequence of 20 to 25% cavities, the 4 to 5 cm thick top layer of very open asphalt concrete takes up the heat originating from the heated steam much more rapidly than the layer of dense asphalt concrete below it. The relatively expensive open top layer having a very specific particle size distribution can then also be processed separately to give new very open asphalt concrete. The invention thus makes it possible to remove the open top layer without damaging the dense underlayer.
  • An essential feature of the invention is that old asphalt layers can be removed rapidly and effectively without emission of hazardous gases and without stone dust being formed as a result of crushing and with retention of the original particle size distribution, by means of treating with steam and pushing off mechanically using a slide or shovel.

Claims (2)

  1. Method for removing old asphalt concrete from a road, wherein steam, having a temperature of at least 105 °C, is blown on to the old asphalt concrete and the asphalt concrete softened in this way is pushed off and removed using a slide or shovel.
  2. Method according to claim 1 wherein the old layer comprises a very open asphalt concrete lying on a layer of dense asphalt concrete, characterized in that steam is blown onto the very open asphalt concrete and the very open asphalt concrete softened in this way is pushed off and removed using a slide or shovel, while the dense layer of asphalt concrete which is more difficult to heat remains behind.
EP92900830A 1990-12-04 1991-12-04 Method for removing old asphalt concrete from a road Expired - Lifetime EP0560864B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL9002659A NL192958C (en) 1990-12-04 1990-12-04 Method for processing old asphalt concrete into usable new asphalt concrete.
NL9002659 1990-12-04
PCT/NL1991/000251 WO1992010613A1 (en) 1990-12-04 1991-12-04 Method for removing old asphalt concrete from a road

Publications (2)

Publication Number Publication Date
EP0560864A1 EP0560864A1 (en) 1993-09-22
EP0560864B1 true EP0560864B1 (en) 1994-07-06

Family

ID=19858087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92900830A Expired - Lifetime EP0560864B1 (en) 1990-12-04 1991-12-04 Method for removing old asphalt concrete from a road

Country Status (5)

Country Link
EP (1) EP0560864B1 (en)
DE (1) DE69102771T2 (en)
ES (1) ES2056010T3 (en)
NL (1) NL192958C (en)
WO (2) WO1992010612A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0704576A1 (en) * 1994-09-30 1996-04-03 Volker Stevin Materieel B.V. Asphalt road treatment apparatus
NL9401612A (en) * 1994-09-30 1996-05-01 Stevin Volker Materieel Bv Asphalt road treatment apparatus
WO1996011242A1 (en) * 1994-10-07 1996-04-18 Aktiebolaget Nynäs Petroleum Method of decreasing the fuming tendency of bitumen
NL9500374A (en) * 1995-02-24 1996-10-01 Stevin Volker Materieel Bv Method for heating bitumen-containing material.
DE59505852D1 (en) * 1995-10-17 1999-06-10 Gerd Prof Dr Ing Brunner Method and device for separating bitumen from asphalt

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB292502A (en) * 1927-06-20 1929-12-06 Provia Soc Improved process and apparatus for cleaning and heating the surface of roads
US2413908A (en) * 1942-08-04 1947-01-07 Pavements Reclaiming Corp Apparatus for conditioning pavement material
JPS523807B2 (en) * 1974-03-28 1977-01-31
DE7422578U (en) * 1974-07-03 1974-09-26 Schoelkopf W Mobile machine for leveling and removing softenable road surfaces
US4189238A (en) * 1975-08-11 1980-02-19 Mendenhall Robert Lamar Recycled asphalt-aggregate process and apparatus
NL7708800A (en) * 1977-08-10 1979-02-13 Moel Wegenbouwmaatschappij B V Used asphalted concrete reworking system - heats in vessel and mixes with new asphalt
US4226552A (en) * 1978-05-17 1980-10-07 Moench Frank F Asphaltic pavement treating apparatus and method
US4619550A (en) * 1984-10-05 1986-10-28 Cd High Technology, Inc. Microwave method and apparatus for heating loose paving materials
US4856202A (en) * 1987-03-20 1989-08-15 Cyclean, Inc. Method and apparatus for treating asphaltic concrete paving materials

Also Published As

Publication number Publication date
WO1992010612A1 (en) 1992-06-25
NL9002659A (en) 1992-07-01
WO1992010613A1 (en) 1992-06-25
EP0560864A1 (en) 1993-09-22
NL192958B (en) 1998-02-02
NL192958C (en) 1998-06-03
DE69102771D1 (en) 1994-08-11
ES2056010T3 (en) 1994-09-01
DE69102771T2 (en) 1994-11-10

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