EP0494218A1 - Reuse of by-products from the manufacture of steel - Google Patents

Reuse of by-products from the manufacture of steel

Info

Publication number
EP0494218A1
EP0494218A1 EP19900914688 EP90914688A EP0494218A1 EP 0494218 A1 EP0494218 A1 EP 0494218A1 EP 19900914688 EP19900914688 EP 19900914688 EP 90914688 A EP90914688 A EP 90914688A EP 0494218 A1 EP0494218 A1 EP 0494218A1
Authority
EP
European Patent Office
Prior art keywords
asphalt
steel
steel slag
manufacture
vol
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.)
Withdrawn
Application number
EP19900914688
Other languages
German (de)
French (fr)
Inventor
Herluf Petersen
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.)
TARCO VEJ AS
Original Assignee
TARCO VEJ AS
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 TARCO VEJ AS filed Critical TARCO VEJ AS
Publication of EP0494218A1 publication Critical patent/EP0494218A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch

Definitions

  • the present invention relates to an asphalt surfacing material, particularly for use as road surface and comprising bitumen, steel slag material and stones.
  • asphalt surfacing materials of the above mentioned type are known, the ratio between bitumen, stones or steel slag material as well as optionally aggregate and filler depending on whether the surfacing material is to be used for road surfaces, floors, swimming pools, joints, castings etc.
  • asphalt In its normal form asphalt is a flexible and durable material having a better ability to resist the stresses in a rigid system such as traditional a oad structure than other building materials such as concrete.
  • the deterioration of asphalt is partly caused by fatigue as described in the elasticity theory, partly by climatic and mechanic deterioration of the surface caused by effects such as abrasion, erosion, oxidative curing etc.
  • presstire-stable asphalt is especially desirable, measured for instance by the so-called Marshall-test, said asphalt having an improved ability to distribute contact pressure on the surface to the subjacent layer.
  • Marshall-test said asphalt having an improved ability to distribute contact pressure on the surface to the subjacent layer. The latter occurs for instance in case of high shaft pressure or .static loads when depositing or parking heavy objects etc,- under normal load conditions and otherwise unchanged conditions, an increased pressure stability results in a prolonged life of the surface.
  • the resistance of the asphalt surfacing material to climatic deterioration and mechanical influences depends largely on the cohesion and strength of the binder.
  • a progressive loss of binder, i.e. an escape of the stones from the surface, is particularly characteristic for a deteriorating asphalt surface.
  • asphalt surfacing materials predominantly comprising steel slag material.
  • These asphalt surfacing materials are, however, extremely expensive to manufacture, as the steel slag material used has to be of high quality to obtain the desired propitious properties, i.e. preferably steel slag material from the manufacture of steel in arc furnaces.
  • the object of the present invention is to provide asphalt surfacing material of particularly suitab durability properties, i.e. high pressure stability a great strength of the asphalt binder, said surfaci material being inexpensive to manufacture.
  • the asphalt surfacing material according to the prese invention is characterised in that the steel sl material comprises predominantly so-called steel sl powder having a grain size of less than 2 mm.
  • T obtained asphalt surfacing material with asphalt bind has particularly propitious durability properties in t form of high pressure stability and great resistance climatic deterioration, said surfacing material being same time inexpensive to manufacture.
  • the stones can have a grai size of predominantly more than 2 _tam.
  • the asphal surfacing material is thus especially inexpensive t manufacture.
  • the steel slag powder according to th invention can comprise crushed s-fceel slag from th manufacture of steel in arc furnaces.
  • the resultin asphalt surfacing material has particularly propitiou durability properties and the- asphalt binder has ver high pressure stability and great strength.
  • predominantly 33% by volume of the granulate material in the surfacing material is steel slag powder.
  • the asphalt surfacing material comprises bitumen, steel slag material and stones as well as optionally aggregate and fibres.
  • bitumen A variety of bitumen types may be used and the asphalt surfacing material may be manufactured at elevated temperatures using hot as well as cold bitumen and bitumen emulsions or bitumen solutions.
  • Steel slag from a large number of steel manufacturing processes may be used for the manufacture of the asphalt surfacing material according to the invention.
  • Steel slag from arc furnaces is particularly suitable because of its unusually good homogeneity, the chemical composition of said steel slag being especially advantageous for obtaining high binder strength due to the high alcalinity of the material.
  • the chemical composition of steel slag from the manufacture of steel in arc furnaces is typically:
  • the pH value of the slag in an aqueous slurry is > 10.
  • the stones comprised therein may be granite, quartzite, flint or the like.
  • the asphalt surfacing material may moreover be manufactured according to usual procedures for the manufacture of such materials, i.e. it is not necessary to alter the commonly used production equipment.
  • the stones and steel slag material are selected first, whereupon the steel slag material is crushed to powder.
  • the latter is heated together with the stones and dried, whereupon adjuvants such as bitumen are optionally added, the substances being mixed either in a positive mixer or a drum mixer to form a homogenous mass.
  • the optimum bitumen percentage and the type of asphalt surfacing material to be manufactured such as asphalt concrete for the abrasive layer or the bearer layer of road surfaces is determined by means of the usual procedures for the composition of asphalt surfacing materials, for instance the Marshall-method.
  • the following example describes asphalt concrete composed according to the Marsha11-method, the different grain size fractions being determined according to the Fuller-curve.
  • Two commonly known types of asphalt concrete are compared with the corresponding asphalt concrete manufactured according to the present invention, the portion of the granulate material of less than 2 mm volumewise being replaced by a corresponding amount of steel slag powder so that the original grain curve mentioned above remains unchanged.
  • the bottom line of the table states the Marshall-stabilities of the asphalt concrete materials in question, i.e. an expression of the pressure stability and strength of the asphalt binder according to the so-called Marshall-method. It is apparent that tlhe pressure stability and strength of the asphalt binder is increased by approx. 50% in both asphalt concrete materials according to the present invention, resulting, of course, in the asphalt binder and thus the asphalt surfacing material according to the present invention having a considerably prolonged durability compared to corresponding known asphalt concrete materials used for reference.
  • the invention may be varied in many ways without thereby deviating from the scope of the invention.
  • the asphalt surfacing material may, for instance, comprise a number of different types of known additives, such as gravel and lime filler.
  • the asphalt surfacing material is not restricted to use as road surfacing material only, as the composition of the surfacing material may be varied so that it can be adapted to the requirements of the material being used as floor surfacing, for swimming pools, joints, castings etc,

Abstract

La matière de scories d'acier provenant de la fabrication d'acier, notamment dans des fours à arc, est broyée afin d'obtenir une poudre de scories d'acier. La poudre de scories d'acier peut être réutilisée par mélange avec des matières de revêtement routier d'asphalte. Ce procédé résout le problème des acieries relatif à l'élimination de scories d'acier. Un gros avantage du procédé consiste en ce que l'on peut utiliser des scories d'acier tirées d'un grand nombre de procédés de fabrication d'acier différents.The steel slag material from steel manufacturing, especially in arc furnaces, is ground to obtain a steel slag powder. Steel slag powder can be reused by mixing with asphalt road surfacing materials. This process solves the problem of steelworks relating to the elimination of steel slag. A big advantage of the process is that one can use steel slag from many different steel making processes.

Description

Title; Reuse of by-products from the manufacture of steal
Technical field
The present invention relates to an asphalt surfacing material, particularly for use as road surface and comprising bitumen, steel slag material and stones.
Background Art
A number of different asphalt surfacing materials of the above mentioned type are known, the ratio between bitumen, stones or steel slag material as well as optionally aggregate and filler depending on whether the surfacing material is to be used for road surfaces, floors, swimming pools, joints, castings etc.
In its normal form asphalt is a flexible and durable material having a better ability to resist the stresses in a rigid system such as traditional a oad structure than other building materials such as concrete.
The deterioration of asphalt is partly caused by fatigue as described in the elasticity theory, partly by climatic and mechanic deterioration of the surface caused by effects such as abrasion, erosion, oxidative curing etc.
For particularly exposed areas, e.g. ψoad surfaces, square surfaces, swimming pools etc., presstire-stable asphalt is especially desirable, measured for instance by the so-called Marshall-test, said asphalt having an improved ability to distribute contact pressure on the surface to the subjacent layer. The latter occurs for instance in case of high shaft pressure or .static loads when depositing or parking heavy objects etc,- under normal load conditions and otherwise unchanged conditions, an increased pressure stability results in a prolonged life of the surface.
The resistance of the asphalt surfacing material to climatic deterioration and mechanical influences depends largely on the cohesion and strength of the binder. A progressive loss of binder, i.e. an escape of the stones from the surface, is particularly characteristic for a deteriorating asphalt surface.
Especially suitable durability properties in the form of high pressure stability, high abrasion resistance and great strength of the asphalt binder are obtained by asphalt surfacing materials predominantly comprising steel slag material. These asphalt surfacing materials are, however, extremely expensive to manufacture, as the steel slag material used has to be of high quality to obtain the desired propitious properties, i.e. preferably steel slag material from the manufacture of steel in arc furnaces.
For many road surfaces, such as Danish country roads and side roads, where the requirements concerning abrasion resistance are not as high as mentioned above and where the asphalt surfacing material should be as inexpensive as possible, the most commonly used asphalt surfacing material comprises predominantly stones. Therefore, it is much- less expensive to manufacture than the above mentioned surfacing materials comprising steel slag material. One problem of these types of surfacing materials is the comparatively weak asphalt binder, as changing weather conditions such *as occur in Denmark quickly deteriorate the asphalt binder, resulting in erosion, oxidative curing and finally fatigue. Description of the Invention
The object of the present invention is to provide asphalt surfacing material of particularly suitab durability properties, i.e. high pressure stability a great strength of the asphalt binder, said surfaci material being inexpensive to manufacture.
The asphalt surfacing material according to the prese invention is characterised in that the steel sl material comprises predominantly so-called steel sl powder having a grain size of less than 2 mm. T obtained asphalt surfacing material with asphalt bind has particularly propitious durability properties in t form of high pressure stability and great resistance climatic deterioration, said surfacing material being same time inexpensive to manufacture.
Due to the alcalinity of the steel slag powder it reac with the acidic components of bitumen, resulting in particularly strong asphalt binder, simultaneous improving the bonding ability of the binder to acidi stones.
According to the invention, the stones can have a grai size of predominantly more than 2 _tam. The asphal surfacing material is thus especially inexpensive t manufacture.
Moreover, the steel slag powder according to th invention can comprise crushed s-fceel slag from th manufacture of steel in arc furnaces. The resultin asphalt surfacing material has particularly propitiou durability properties and the- asphalt binder has ver high pressure stability and great strength. In a particularly advantageous embodiment of the invention, predominantly 33% by volume of the granulate material in the surfacing material is steel slag powder.
Best Mode for Carrying Out the Invention
The invention is described in greater detail below and with reference to particularly preferred embodiments.
The asphalt surfacing material comprises bitumen, steel slag material and stones as well as optionally aggregate and fibres. A variety of bitumen types may be used and the asphalt surfacing material may be manufactured at elevated temperatures using hot as well as cold bitumen and bitumen emulsions or bitumen solutions.
Steel slag from a large number of steel manufacturing processes may be used for the manufacture of the asphalt surfacing material according to the invention. Steel slag from arc furnaces is particularly suitable because of its unusually good homogeneity, the chemical composition of said steel slag being especially advantageous for obtaining high binder strength due to the high alcalinity of the material.
Other types of steel slag such as slag from the manufacture of steel according to the LD process is of lesser homogeneity and chemical/physical stability due to a high content of CaO, free MgO etc. These types of slag become brittle due to weathering effects and are therefore unsuitable as aggregate in the abrasion layer of the asphalt. These types of steel slag can, however, be used for the manufacture of asphalt surfacing materials according to the present invention, as they are ground to steel slag powder instead of being aggregate. The present invention thus allows an increa-sed use of by-products from the manufacture of steel, resulting i the quality of certain asphalt materials i>eing improved while simultaneously solving a waste removal problem of steel mills.
The chemical composition of steel slag from the manufacture of steel in arc furnaces is typically:
The pH value of the slag in an aqueous slurry is > 10.
As is common in the manufacture of asphalt surfacing materials, the stones comprised therein may be granite, quartzite, flint or the like. The asphalt surfacing material may moreover be manufactured according to usual procedures for the manufacture of such materials, i.e. it is not necessary to alter the commonly used production equipment. In other words, the stones and steel slag material are selected first, whereupon the steel slag material is crushed to powder. The latter is heated together with the stones and dried, whereupon adjuvants such as bitumen are optionally added, the substances being mixed either in a positive mixer or a drum mixer to form a homogenous mass. The optimum bitumen percentage and the type of asphalt surfacing material to be manufactured such as asphalt concrete for the abrasive layer or the bearer layer of road surfaces is determined by means of the usual procedures for the composition of asphalt surfacing materials, for instance the Marshall-method.
The following example describes asphalt concrete composed according to the Marsha11-method, the different grain size fractions being determined according to the Fuller-curve. Two commonly known types of asphalt concrete are compared with the corresponding asphalt concrete manufactured according to the present invention, the portion of the granulate material of less than 2 mm volumewise being replaced by a corresponding amount of steel slag powder so that the original grain curve mentioned above remains unchanged.
Asphalt concrete Asphalt concrete 8t granite 8t granite with steel slag
0/6 gravel 15% by vol. 15% by vol.
0/2 stone powder 33% by vol. 0/2 steel slag 33% by vol. 2/5 granite 17% by vol. 17% by vol. 5/8 granite 35% by vol. 35% by vol. 8/12 granite lime filler 3% by weight 3% by weight bitumen 5,9% by weight 5,5% by weight
Marshall-stability 7,6 kN 11,1 kN
Asphalt concrete Asphalt concrete 12t granite Y2-t granite with steel slag
0/6 gravel 10% by vol. 10% by vol.
0/2 stone powder 34% by vol.
0/2 steel slag 34% by vol.
2/5 granite 6% by vol. 6% by vol.
5/8 granite 10% by vol. 10% by vol.
8/12 granite 39% by vol. 39% by vol. lime filler 2% by weight 2% by weight bitumen 5,5% by weight 5,2% by weight
Marshall-stability 9,5 kN 13,8 kN
As is apparent, the bottom line of the table states the Marshall-stabilities of the asphalt concrete materials in question, i.e. an expression of the pressure stability and strength of the asphalt binder according to the so-called Marshall-method. It is apparent that tlhe pressure stability and strength of the asphalt binder is increased by approx. 50% in both asphalt concrete materials according to the present invention, resulting, of course, in the asphalt binder and thus the asphalt surfacing material according to the present invention having a considerably prolonged durability compared to corresponding known asphalt concrete materials used for reference.
The invention may be varied in many ways without thereby deviating from the scope of the invention. The asphalt surfacing material may, for instance, comprise a number of different types of known additives, such as gravel and lime filler. The asphalt surfacing material is not restricted to use as road surfacing material only, as the composition of the surfacing material may be varied so that it can be adapted to the requirements of the material being used as floor surfacing, for swimming pools, joints, castings etc,

Claims

Claims
1. Asphalt surfacing material, particularly' for use as road surface, and comprising bitumen, steel s-bag material and stones, c h a r a c t e r i z e d in that the steel slag material predominantly comprises so-called st-^el slag powder having a grain size of less than 2 mm.
2. Asphalt surfacing material according to claim 1, c h a r a c t e r i z e d in that the grain size of the stones is predominantly more than 2 mm.
3. Asphalt surfacing material according to claim 1 or 2, c h a r a c t e r i z e d in that the steel slag powder comprises crushed steel slag from the manufacture of steel in arc furnaces.
4. Asphalt surfacing material according to. claim 1, 2 or 3, c h a r a c t e r i z e d in that predominantly 33% by volume of the granulate material in the surfacing material is steel slag powder.
EP19900914688 1989-09-27 1990-09-26 Reuse of by-products from the manufacture of steel Withdrawn EP0494218A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK4768/89 1989-09-27
DK476889A DK476889A (en) 1989-09-27 1989-09-27 RECYCLING BY-PRODUCT HYDRAULIC FROM STEEL PRODUCTION

Publications (1)

Publication Number Publication Date
EP0494218A1 true EP0494218A1 (en) 1992-07-15

Family

ID=8136487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900914688 Withdrawn EP0494218A1 (en) 1989-09-27 1990-09-26 Reuse of by-products from the manufacture of steel

Country Status (3)

Country Link
EP (1) EP0494218A1 (en)
DK (1) DK476889A (en)
WO (1) WO1991005019A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100419622B1 (en) * 1998-12-24 2004-04-17 주식회사 포스코 A method of preparing an asphalt concrete aggregate
ES2558617B1 (en) * 2014-08-04 2016-10-11 Universidad De Burgos Draining bituminous mixture with white slag residue from spoon oven
KR101952894B1 (en) * 2018-07-13 2019-02-28 한국건설기술연구원 Anti-stripping agenet for asphalt mixture using purified slowly cooled slag, method for manufacturing the same, asphalt mixture including the same and method for manufacturing the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB815496A (en) * 1956-06-27 1959-06-24 Shanks & Mcewan Method of and materials for surfacing roads and the like
DE2628008C3 (en) * 1976-06-23 1979-07-26 Graenges Oxeloesunds Jaernverk Ab, Oxeloesund (Schweden) Covering for paths, streets and squares and methods of its manufacture
FR2390392A1 (en) * 1977-05-13 1978-12-08 Rhone Poulenc Ind NEW MILK CATCH ACTIVANT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9105019A1 *

Also Published As

Publication number Publication date
DK476889D0 (en) 1989-09-27
DK476889A (en) 1991-03-28
WO1991005019A1 (en) 1991-04-18

Similar Documents

Publication Publication Date Title
Manasseh Use of crushed granite fine as replacement to river sand in concrete production
EP2083121B1 (en) A porous concrete road surface structure made from polymer modified cement and a construction method thereof
JP3215425B2 (en) Inter-ground fiber cement
Chowdhury et al. Polyethylene terephthalate (PET) waste as building solution
KR101065037B1 (en) Latex modified concrete composition comprising fibrous reinforcement
US20190315654A1 (en) Beneficiation of Inorganic Matrices with Wet, Non-Agglomerated, High-Concentration and Stable Graphite Nanoplatelets without Any Extra Measures to Disperse the Nanoplatelets
Abdelbary et al. Investigating abrasion resistance of interlocking blocks incorporating steel slag aggregate
Khan et al. Behavior of crumb rubber concrete
EP0545740B1 (en) Process for double cold mixing of granular material for road construction
US7004673B2 (en) Asphalt concrete pavement with concrete subbase with the enriched quarry limestone waste as a coarse aggregate
Akinyele et al. Assessment of the properties of bricks made from stone dust and molten plastic for building and pedestrian pavement
EP0350365A1 (en) Fibre-reinforced compacted concrete and its use
WO2007026977A1 (en) Soil rock layer's composition, constructing method thereof and road construction method thereby
EP0494218A1 (en) Reuse of by-products from the manufacture of steel
KR100333443B1 (en) Manufacturing Methods of Wire-Mesh and Hook-Ended Steel Fiber Reinforced Porous Concrete and Precast Slab Panel for High Performance Pavement
JP2007022843A (en) Aggregate for flow-resistant asphalt mixture
DHAL et al. HYBRID FIBRE REINFORCED CONCRETE WITH REPLACEMENT OF FINE AGGREGATE.
JP4319312B2 (en) Concrete pavement
Tessema et al. The Influence of Coffee Husk Ash as a Filler on the Performance of Bituminous Concrete Mix
KR100445126B1 (en) A water-permeable concrete composition utilizing blast furnace slag
EP3799607B1 (en) A jointless concrete composite pavement
AU2021106265A4 (en) Partially replacement of cement by utilization of marble dust and tile dust
RU2318765C1 (en) Asphalt-concrete mix for highway engineering
Reddy et al. An Experimental Analysis on the Effects of Manufactured Sand on the Compressive Strength of Concrete
Hop et al. Polymer-mineral mixtures as new building materials

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19920320

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19940215

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

R18D Application deemed to be withdrawn (corrected)

Effective date: 19940628