WO1992010613A1 - 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
WO1992010613A1
WO1992010613A1 PCT/NL1991/000251 NL9100251W WO9210613A1 WO 1992010613 A1 WO1992010613 A1 WO 1992010613A1 NL 9100251 W NL9100251 W NL 9100251W WO 9210613 A1 WO9210613 A1 WO 9210613A1
Authority
WO
WIPO (PCT)
Prior art keywords
asphalt concrete
layer
road
old asphalt
open
Prior art date
Application number
PCT/NL1991/000251
Other languages
French (fr)
Inventor
Andreas Goverdina Kemps
Original Assignee
Hollandsche Beton Groep N.V.
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 N.V. filed Critical Hollandsche Beton Groep N.V.
Priority to DE69102771T priority Critical patent/DE69102771T2/en
Priority to EP92900830A priority patent/EP0560864B1/en
Publication of WO1992010613A1 publication Critical patent/WO1992010613A1/en

Links

Classifications

    • 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
    • E01C23/00Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08Devices 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
    • 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
    • E01C19/1004Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
    • 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
    • E01C23/00Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/14Auxiliary 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.
  • the aim of the invention is to overcome the abovementioned disadvantages and to this end superheated steam 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.
  • Softening of old asphalt concrete with the aid of infrared radiators or gas flames is unacceptable in connection with the emission of carcinogenic gases.
  • the use of superheated steam surprisingly leads to outstanding results. 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.
  • the superheated steam has a temperature of at least 105°C
  • 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 very open asphalt concrete layer being softened by blowing superheated steam on to it and pushed off, while the dense layer of asphalt concrete, which is more difficult to heat, remains behind.
  • the --. to 5 cm thick top layer of very open asphalt concrete takes up the heat originating from the superheated 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 superheated steam and pushing off mechanically using a slide or shovel.

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

Title: Method for removing old asphalt concrete from a road.
The invention relates to a method for removing old asphalt concrete from a road.
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 mechanical 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. 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 2 % 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- Another drawback of crushing or milling is the dust formation, mainly caused by crushing of the stone fraction.
The aim of the invention is to overcome the abovementioned disadvantages and to this end superheated steam 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.
Since mechanical crushing or milling can be dispensed with, the particle size distribution of the old asphalt concrete to be processed into new asphalt concrete will be unchanged with respect to the particle size distribution in the relevant layer. There is no formation of substances hazardous to health (fine grit, hazardous gases formed on combustion) .
Softening of old asphalt concrete with the aid of infrared radiators or gas flames is unacceptable in connection with the emission of carcinogenic gases. The use of superheated steam surprisingly leads to outstanding results. 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.
Preferably, the superheated steam has a temperature of at least 105°C 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 very open asphalt concrete layer being softened by blowing superheated steam on to it and pushed off, 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 --. to 5 cm thick top layer of very open asphalt concrete takes up the heat originating from the superheated 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 superheated steam and pushing off mechanically using a slide or shovel.

Claims

Claims
1. Method for removing old asphalt concrete from a road, characterised in that steam 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, characterised in that the steam has a temperature of at least 10 βC.
3. Method according to Claim 1 or 2, characterised in that the layer of very open asphalt concrete from a layer of very open asphalt concrete lying on a layer of dense asphalt concrete is softened by blowing steam on to said layer of very open asphalt concrete and pushed off, while the dense layer of asphalt concrete which is more difficult to heat remains behind.
PCT/NL1991/000251 1990-12-04 1991-12-04 Method for removing old asphalt concrete from a road WO1992010613A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69102771T DE69102771T2 (en) 1990-12-04 1991-12-04 METHOD FOR REMOVING ASPHALT CONCRETE FROM A DRIVEWAY.
EP92900830A EP0560864B1 (en) 1990-12-04 1991-12-04 Method for removing old asphalt concrete from a road

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
WO1992010613A1 true WO1992010613A1 (en) 1992-06-25

Family

ID=19858087

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/NL1991/000249 WO1992010612A1 (en) 1990-12-04 1991-12-04 Process for converting old asphaltic concrete into usable new asphaltic concrete
PCT/NL1991/000251 WO1992010613A1 (en) 1990-12-04 1991-12-04 Method for removing old asphalt concrete from a road

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/NL1991/000249 WO1992010612A1 (en) 1990-12-04 1991-12-04 Process for converting old asphaltic concrete into usable new asphaltic concrete

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)

Cited By (2)

* 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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (3)

* 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
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Patent Citations (3)

* 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
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

Cited By (2)

* 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

Also Published As

Publication number Publication date
DE69102771D1 (en) 1994-08-11
EP0560864B1 (en) 1994-07-06
NL9002659A (en) 1992-07-01
ES2056010T3 (en) 1994-09-01
WO1992010612A1 (en) 1992-06-25
EP0560864A1 (en) 1993-09-22
NL192958C (en) 1998-06-03
NL192958B (en) 1998-02-02
DE69102771T2 (en) 1994-11-10

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