WO1981003039A1 - Process for tack coating in road surfacing - Google Patents

Process for tack coating in road surfacing Download PDF

Info

Publication number
WO1981003039A1
WO1981003039A1 PCT/SE1981/000117 SE8100117W WO8103039A1 WO 1981003039 A1 WO1981003039 A1 WO 1981003039A1 SE 8100117 W SE8100117 W SE 8100117W WO 8103039 A1 WO8103039 A1 WO 8103039A1
Authority
WO
WIPO (PCT)
Prior art keywords
asphalt
tack
tack coat
compound
layers
Prior art date
Application number
PCT/SE1981/000117
Other languages
French (fr)
Inventor
I Christensen
Original Assignee
Skanska Cementgjuteriet Ab
I Christensen
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 Skanska Cementgjuteriet Ab, I Christensen filed Critical Skanska Cementgjuteriet Ab
Priority to AT81900934T priority Critical patent/ATE7315T1/en
Priority to AU70714/81A priority patent/AU539587B2/en
Priority to BR8108318A priority patent/BR8108318A/en
Priority to DE8181900934T priority patent/DE3163359D1/en
Publication of WO1981003039A1 publication Critical patent/WO1981003039A1/en
Priority to DK556081AA priority patent/DK153957B/en
Priority to NO814280A priority patent/NO156096C/en

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
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
    • E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
    • 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
    • E01C7/185—Isolating, separating or connecting intermediate layers, e.g. adhesive layers; Transmission of shearing force in horizontal intermediate planes, e.g. by protrusions

Definitions

  • the present invention relates to a process for tack coating between layers of road surfacing material such as asphalt concrete where an existing layer is swept clean and sprayed with a thin film of an asphalt tack coat, whereafter asphalt is laved out on top of the tack coat.
  • a road surface is built up layer by layer with different materials for the various functions of the road. in order to assure that no slippage occurs between the layers, it is necessary to bind the layers with a thin tack coat. Normally the tack coat is only laid between the uppermost asphalt layers and not between the gravel layers which have by themselves sufficient friction between them.
  • the tack coat normally consists of an asphalt which has been dissolved in a solvent, e.g. naphta, or of an asphalt which has been emulsified in water.
  • a solvent e.g. naphta
  • asphalt solution in the former case one speaks of an asphalt solution, and in the latter case of an asphalt emulsion.
  • the asphalt solution is however of less interest now and will presumably disappear completely from the market because of the fact that it contains solvents which can be used for other purposes, i.e. as motor fuels, and the fact that they create a hazardous working environment.
  • the purpose of the present invention is to achieve a process for tack coating between layers of surfacing material, which does not have the above-mentioned disadvantages, which provides full adhesive effect immediately and which provides better adhesion than conventional tack coating.
  • an aqueous emulsion of an asphalt is used as the tack coat.
  • Asphalt compound which consists of gravel and asphalt, is made in asphalt plants. From there, the asphalt is driven in trucks to the surfacing site and is dumped into an asphalt laying machine or is laid out manually. The asphalt compund then has a temperature of about 150oC. After this compound has been applied and rolled, it is called asphalt concrete.
  • a tack coat is used, as was mentioned above, the composition of which is specified in construction standards.
  • the existing asphalt concrete layer is first brushed clean, whereafter the tack coat is spread out by a separate work team with a special separate unit. Then one waits about 1/4 to 2 hours until the water or solvent has evaporated, leaving a thick, sticky asphalt film. Only then is the asphalt compound for the next layer laid out and rolled.
  • This binding method only produces an adhesion on the "tops", i.e. a surface adhesion.
  • the fresh, hot asphalt compound is applied immediately after the sweeping and the spreading of the tack coat, so that the asphalt compound drops on the wet tack coat film.
  • the tack coat is spread in amounts on the order of 0.2 - 0.4 kg per square meter and has a water content of about 30-50 per cent. This should be compared with the asphalt compound, which has a temperature of about 150oC and which is laid in amounts of about 60-120 kg per square meter.
  • the hot asphalt is laid on the tack coat, the water in the tack coat or tack coat emulsion will boil violently and be vaporized, thus breaking the emulsion.
  • This conversion results in a sharp increase in volume in the tack coat and appears as foam.
  • the foaming and increased pressure forces the adhesive into the pores and capillaries both upwards and downwards, producing especially good adhesion at full effect immediately.
  • a deep acting adhesion is obtained which is clearly superior to the adhesion obtained by conventional tack coating. Any remaining water in the pores etc. does not affect the adhesive result, which is best demonstrated by the fact that water-coated rollers can be used to avoid having the newly laid asphalt compound stick to the rollers, without resulting in any negative effects.
  • Series of tests carried out on a pilot scale to determine whether the method would work have shown that significantly better results as regards the mechanical adhesion are obtained than with the conventional technique, and, as was indicated above, this depends on, among other things, the deep-acting adhesive effect, which is obtained by the increase in volume of the tack coat as the water is vaporized.
  • the advantaces of the Drocess according to the invention are thus that the need for an extra work team for the tack coating work is eliminated, as well as the need for a separate tack coating unit.
  • the process according to the invention is most suited to tack coats in the form of an aqueous emulsion, but will work for all asphalt binders which are used at present if the amounts of tack coat are adapted to the process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Process for tack coating between layers of road surfacing material such as asphalt concrete, in which an existing layer is swept clean and sprayed with a thin layer of asphalt binder or tack coal, whereafter asphalt compound is laid out on the tack coat. The asphalt compound is laid out immediately after the existing asphalt concrete layer has been swept clean and tack coated, the tack coat being dried and broken by the applied fresh, hot asphalt compound.

Description

Process for tack coating in road surfacing
The present invention relates to a process for tack coating between layers of road surfacing material such as asphalt concrete where an existing layer is swept clean and sprayed with a thin film of an asphalt tack coat, whereafter asphalt is laved out on top of the tack coat.
A road surface is built up layer by layer with different materials for the various functions of the road. in order to assure that no slippage occurs between the layers, it is necessary to bind the layers with a thin tack coat. Normally the tack coat is only laid between the uppermost asphalt layers and not between the gravel layers which have by themselves sufficient friction between them.
The tack coat normally consists of an asphalt which has been dissolved in a solvent, e.g. naphta, or of an asphalt which has been emulsified in water. In the former case one speaks of an asphalt solution, and in the latter case of an asphalt emulsion. The asphalt solution is however of less interest now and will presumably disappear completely from the market because of the fact that it contains solvents which can be used for other purposes, i.e. as motor fuels, and the fact that they create a hazardous working environment.
In conventional tack coating, the tack coat is left to dry, and the water evaporates, leaving a sticky film of asphalt. This process is quite disadvantageous, since a special work team and a separate unit are required for the tack coating plus the fact that a waiting period is required for drying.
The purpose of the present invention is to achieve a process for tack coating between layers of surfacing material, which does not have the above-mentioned disadvantages, which provides full adhesive effect immediately and which provides better adhesion than conventional tack coating.
This is achieved by means of the process according to the present invention, which is characterized in that the asphalt compound is laid out immediately after the existing asphalt concrete layer has been cleaned and tack coated, and in that the tack coat is dried and broken by the applied fresh and hot asphalt compound.
According to a preferred embodiment of the invention, an aqueous emulsion of an asphalt is used as the tack coat.
Further characteristics and advantages of the present invention will be revealed in the following detailed description.
Asphalt compound, which consists of gravel and asphalt, is made in asphalt plants. From there, the asphalt is driven in trucks to the surfacing site and is dumped into an asphalt laying machine or is laid out manually. The asphalt compund then has a temperature of about 150ºC. After this compound has been applied and rolled, it is called asphalt concrete.
In order to avoid slippage between the asphalt concrete layers, a tack coat is used, as was mentioned above, the composition of which is specified in construction standards.
According to the technique which is the only one used at present, the existing asphalt concrete layer is first brushed clean, whereafter the tack coat is spread out by a separate work team with a special separate unit. Then one waits about 1/4 to 2 hours until the water or solvent has evaporated, leaving a thick, sticky asphalt film. Only then is the asphalt compound for the next layer laid out and rolled.
This binding method only produces an adhesion on the "tops", i.e. a surface adhesion.
The reason for waiting until the water has evaporated is that according to prevailing wisdom up to now, full adhesive effect is not achieved immediately, and this is necessary to prevent the new layer from slipping during the subsequent rolling and under traffic loads.
Tests have now shown rhat it is not necessary to allow the tack coat to dry. Rather, in complete contrast to previous wisdom, a better result is obtained if the tack coat is not allowed to dry prior to application of the asphalt compound. According to the invention, the fresh, hot asphalt compound is applied immediately after the sweeping and the spreading of the tack coat, so that the asphalt compound drops on the wet tack coat film.
The tack coat is spread in amounts on the order of 0.2 - 0.4 kg per square meter and has a water content of about 30-50 per cent. This should be compared with the asphalt compound, which has a temperature of about 150ºC and which is laid in amounts of about 60-120 kg per square meter. When the hot asphalt is laid on the tack coat, the water in the tack coat or tack coat emulsion will boil violently and be vaporized, thus breaking the emulsion. This conversion results in a sharp increase in volume in the tack coat and appears as foam. The foaming and increased pressure forces the adhesive into the pores and capillaries both upwards and downwards, producing especially good adhesion at full effect immediately. A deep acting adhesion is obtained which is clearly superior to the adhesion obtained by conventional tack coating. Any remaining water in the pores etc. does not affect the adhesive result, which is best demonstrated by the fact that water-coated rollers can be used to avoid having the newly laid asphalt compound stick to the rollers, without resulting in any negative effects. Series of tests carried out on a pilot scale to determine whether the method would work, have shown that significantly better results as regards the mechanical adhesion are obtained than with the conventional technique, and, as was indicated above, this depends on, among other things, the deep-acting adhesive effect, which is obtained by the increase in volume of the tack coat as the water is vaporized.
The advantaces of the Drocess according to the invention are thus that the need for an extra work team for the tack coating work is eliminated, as well as the need for a separate tack coating unit.
Furthermore, the waiting time for breaking and drying of the tack coat is eliminated, resulting in a considerable time savings in the road servicing work. At the same time, an improved mechanical adhesion is obtained between the layers.
The process according to the invention is most suited to tack coats in the form of an aqueous emulsion, but will work for all asphalt binders which are used at present if the amounts of tack coat are adapted to the process.

Claims

1. Process for tack coating between layers of road surfacing material, such as asphalt concrete, where an existing layer is swept clean and spread with a thin film of asphalt binder or tack coat, whereafter asphalt compound is laid out on the tack coat, characterized in that the asphalt compound is laid out immediately after the existing asphalt concrete layer has been swept clean and tack coated, and in that the tack coat is dried and broken by the applied fresh, hot asphalt compound.
2. Process according to claim 1, characterized in that an aqueous emulsion of an asphalt is used as a tack coat.
3. Process according to claims 1-2, characterized in that the asphalt compound with a temperature of about 150ºC is applied onto the tack coat, thereby vaporizing the water in the tack coat in order to achieve such an increase in volume in the tack coat that it penetrates into pores and capillaries in the two layers, thereby achieving a deep adhesion.
PCT/SE1981/000117 1980-04-17 1981-04-15 Process for tack coating in road surfacing WO1981003039A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT81900934T ATE7315T1 (en) 1980-04-17 1981-04-15 PROCESS FOR APPLYING AN ADHESIVE COATING TO ROAD SURFACES.
AU70714/81A AU539587B2 (en) 1980-04-17 1981-04-15 Process for tack coating in road surfacing
BR8108318A BR8108318A (en) 1980-04-17 1981-04-15 ADHESIVE LAYER APPLICATION PROCESS IN ROAD COVERING
DE8181900934T DE3163359D1 (en) 1980-04-17 1981-04-15 Process for tack coating in road surfacing
DK556081AA DK153957B (en) 1980-04-17 1981-12-15 PROCEDURE FOR PUBLISHING ROAD MATERIALS.
NO814280A NO156096C (en) 1980-04-17 1981-12-15 PROCEDURE FOR CONNECTING ROAD LAYERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8002888 1980-04-17
SE8002888A SE441370B (en) 1980-04-17 1980-04-17 PROCEDURE FOR Paving by road

Publications (1)

Publication Number Publication Date
WO1981003039A1 true WO1981003039A1 (en) 1981-10-29

Family

ID=20340757

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1981/000117 WO1981003039A1 (en) 1980-04-17 1981-04-15 Process for tack coating in road surfacing

Country Status (15)

Country Link
EP (1) EP0049260B1 (en)
JP (1) JPS57500478A (en)
BE (1) BE888455A (en)
BR (1) BR8108318A (en)
CA (1) CA1152795A (en)
DE (1) DE3163359D1 (en)
DK (1) DK153957B (en)
ES (1) ES501427A0 (en)
IT (1) IT1144171B (en)
MX (1) MX155174A (en)
PT (1) PT72870B (en)
SE (1) SE441370B (en)
SU (1) SU1060123A3 (en)
WO (1) WO1981003039A1 (en)
ZA (1) ZA812484B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685929A1 (en) * 1992-01-07 1993-07-09 Colas Sa Method for breaking an attachment or spreading emulsion intended to receive a mix or grit (gravel) for surfacing roads
FR2716470A1 (en) * 1994-02-21 1995-08-25 Screg Routes & Travaux Procedure for making ultra thin road surface coating layer
EP0829579A1 (en) * 1996-09-13 1998-03-18 Screg Accessible binding layer and method for producing them
EP0971072A1 (en) * 1998-07-10 2000-01-12 ÖSTERREICHISCHE VIALIT GESELLSCHAFT mbH Method for making asphalt coverings
WO2009134306A1 (en) * 2008-04-28 2009-11-05 Road Science, Llp Rut resistant coating and method of applying rut resistant coating
CN103114515A (en) * 2013-01-31 2013-05-22 武汉理工大学 Piezoelectric buried damage self-diagnosis asphalt concrete pavement structure
US20160340839A1 (en) * 2015-05-20 2016-11-24 Sika Technology Ag Simple application of an adhesive material to a substrate with excellent adhesion to asphalt

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2822887A1 (en) * 1978-05-26 1979-11-29 Hoechst Ag LIGHT SENSITIVE RECORDING MATERIAL AND METHOD FOR THE PRODUCTION OF RELIEF RECORDS
EP1837442B2 (en) 2006-03-24 2016-04-13 Joseph Vögele AG Paving train
FR2938547B1 (en) * 2008-11-14 2012-11-16 Total Raffinage Marketing CLEAR SYNTHETIC BINDER
AU2011220557B2 (en) 2010-02-24 2015-07-16 Blacklidge Emulsions, Inc. Hot applied tack coat

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539763A (en) * 1921-07-05 1925-05-26 Miles G Nixon Method of constructing asphalt pavements
GB1268273A (en) * 1968-05-16 1972-03-29 Algemene Kunstzijde Unie Nv A process for the bituminous coverings to a substrate surface
NO134757B (en) * 1970-05-29 1976-08-30 Hoechst Ag

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539763A (en) * 1921-07-05 1925-05-26 Miles G Nixon Method of constructing asphalt pavements
GB1268273A (en) * 1968-05-16 1972-03-29 Algemene Kunstzijde Unie Nv A process for the bituminous coverings to a substrate surface
NO134757B (en) * 1970-05-29 1976-08-30 Hoechst Ag

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
"Asphalt in Pavement Maintenance", published 1967 (First Edition), by the Asphalt Institute, see p 14 para 2.05. *
"Bitumen in road surfacing", published 1963 (second printing), by Shell International Petroleum Co Ltd (London), see p 42 *
"Specification for Rolled asphalt (hot process) for roads and other paved areas" published 1973 by British Standards Institution (London), see p 30 para 4.1.5 *
G P Jackson, D Brien: "Asphaltic Concrete" published 1962, by Shell International Petroleum Co Ltd (London), see p 54 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685929A1 (en) * 1992-01-07 1993-07-09 Colas Sa Method for breaking an attachment or spreading emulsion intended to receive a mix or grit (gravel) for surfacing roads
FR2716470A1 (en) * 1994-02-21 1995-08-25 Screg Routes & Travaux Procedure for making ultra thin road surface coating layer
AU724803B2 (en) * 1996-09-13 2000-09-28 Screg Binder layers which can be driven over and process for the preparation thereof
EP0829579A1 (en) * 1996-09-13 1998-03-18 Screg Accessible binding layer and method for producing them
FR2753463A1 (en) * 1996-09-13 1998-03-20 Screg CIRCULABLE BINDER LAYERS AND THEIR PREPARATION METHOD
AT407717B (en) * 1998-07-10 2001-05-25 Vialit Gmbh Oesterr METHOD FOR SPRAYING SURFACES
EP0971072A1 (en) * 1998-07-10 2000-01-12 ÖSTERREICHISCHE VIALIT GESELLSCHAFT mbH Method for making asphalt coverings
WO2009134306A1 (en) * 2008-04-28 2009-11-05 Road Science, Llp Rut resistant coating and method of applying rut resistant coating
US7802941B2 (en) 2008-04-28 2010-09-28 Road Science, L.L.C. Rut resistant coating and method of applying rut resistant coating
CN103114515A (en) * 2013-01-31 2013-05-22 武汉理工大学 Piezoelectric buried damage self-diagnosis asphalt concrete pavement structure
CN103114515B (en) * 2013-01-31 2016-01-06 武汉理工大学 Piezoelectricity flush type damnification self-diagnosis asphalt concrete pavement structure
US20160340839A1 (en) * 2015-05-20 2016-11-24 Sika Technology Ag Simple application of an adhesive material to a substrate with excellent adhesion to asphalt
US9915037B2 (en) * 2015-05-20 2018-03-13 Sika Technology Ag Simple application of an adhesive material to a substrate with excellent adhesion to asphalt

Also Published As

Publication number Publication date
EP0049260B1 (en) 1984-05-02
JPS57500478A (en) 1982-03-18
ZA812484B (en) 1982-04-28
MX155174A (en) 1988-02-01
IT8167529A0 (en) 1981-04-17
DE3163359D1 (en) 1984-06-07
SE8002888L (en) 1981-10-18
PT72870B (en) 1982-08-19
ES8206712A1 (en) 1982-08-16
PT72870A (en) 1981-05-01
BR8108318A (en) 1982-03-09
BE888455A (en) 1981-08-17
ES501427A0 (en) 1982-08-16
EP0049260A1 (en) 1982-04-14
CA1152795A (en) 1983-08-30
DK556081A (en) 1981-12-15
SU1060123A3 (en) 1983-12-07
SE441370B (en) 1985-09-30
DK153957B (en) 1988-09-26
IT1144171B (en) 1986-10-29

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