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EP0828795A1 - Procede de production d'un agregat utilise pour la construction de routes - Google Patents

Procede de production d'un agregat utilise pour la construction de routes

Info

Publication number
EP0828795A1
EP0828795A1 EP96914839A EP96914839A EP0828795A1 EP 0828795 A1 EP0828795 A1 EP 0828795A1 EP 96914839 A EP96914839 A EP 96914839A EP 96914839 A EP96914839 A EP 96914839A EP 0828795 A1 EP0828795 A1 EP 0828795A1
Authority
EP
European Patent Office
Prior art keywords
carbonate
carboxylic acid
caking
stage
mixed
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Withdrawn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
EP96914839A
Other languages
German (de)
English (en)
Inventor
Wilhelm Kämereit
Oskar Schmitt
Iwao Takeda
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0828795A1 publication Critical patent/EP0828795A1/fr
Withdrawn legal-status Critical Current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
    • E01C11/00—Details of pavings
    • E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
    • E01C11/245—Methods or arrangements for preventing slipperiness or protecting against influences of the weather for preventing ice formation or for loosening ice, e.g. special additives to the paving material, resilient coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/02—Organic and inorganic ingredients
    • 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
    • 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
    • E01C7/182—Aggregate or filler materials, except those according to E01C7/26

Definitions

  • the invention relates to a method for producing an additive for road construction for lowering the freezing point according to the preamble of claim 1.
  • Such an agent has the task of freezing surface water on traffic areas and the formation of hoarfrost at temperatures such. B. in the range of about - 2 to - 4 ° C.
  • snow removal in winter is to be made easier by reducing the adhesion of the snow to the surface of the traffic area.
  • An additive in the form of a powder-shaped hydrophobic filler for bitumen-bound traffic areas is known from DE 41 29 621 A1. This consists of 60 to 95% by weight of one or more substances which lower the freezing point of the water, as well as 0 to 39.9% by weight of rock powder and 0.1 to 10% by weight of one or more hydrophobicized amorphous silicon dioxide. It is a fine grain mixture with a grain size of less than 200 ⁇ m. Chlorides of the alkaline earth metals are particularly preferred as freezing point-lowering substances. This known means not only has good compatibility with the others for the production of bitumen-bound
  • Phosphoric acid and organic carboxylic acid is reacted at elevated temperature in the range of about 1 10 to 150 ° C with constant stirring.
  • the ratio of phosphoric acid to organic carboxylic acid should be in the range from 1: 1 to 1:10.
  • the dry mixture is comminuted to a grain size of less than 0.2 mm, preferably less than 0.1 mm.
  • a rock flour e.g. quartz flour, lava flour, pumice stone flour
  • rock flour is then mixed into the intermediate product thus produced in a quantity ratio which is approximately in the range from 1: 1 to 1: 4 (rock flour to intermediate product).
  • this mixture is mixed uniformly with a water repellent.
  • Acetic acid is preferably used as the organic carboxylic acid.
  • the aggregate produced in this way not only shows excellent effects with regard to the lowering of the freezing point, which, depending on the concentration, extends to a range of approximately -9 ° C., but is also completely environmentally compatible. In addition, this agent shows no adverse effects on corrosive stress
  • the object of the invention is therefore to propose a method with which a generic aggregate for road construction can be produced, the production of which is possible with a significantly reduced outlay and which can nevertheless have the same positive effects.
  • the invention is based on the knowledge that the comparatively high manufacturing costs of the known additive in the energy and plant expenditure for the implementation of the first process step, ie the implementation of the ones used Acids (phosphoric acid and organic carboxylic acid) with the comminuted starting material consisting of magnesium carbonate and calcium carbonate (Mg / Ca carbonate), preferably dolomite, can be seen.
  • the quantities used to produce this additive can be varied within the following limits (% by weight):
  • the invention now provides that the reaction is carried out at elevated temperature with only a portion of the Mg / Ca carbonate. It is recommended that an amount of at most 20%, preferably less than 10% and particularly preferably about 2 to 5%, in particular about 3% of the total amount be used for this
  • Mg / Ca carbonate in the first stage of the process.
  • This partial amount of Mg / Ca carbonate is mixed with the total phosphoric acid portion envisaged and with a portion of the carboxylic acid and reacted at elevated temperature, preferably with constant stirring. It is thereby achieved that the quantities of substance to be heated are limited to a small fraction of the quantities of substance previously used in the warm process stage. This drastically reduces the amount of energy required for heating, and there is also a corresponding reduction in the amount of equipment required (smaller container sizes compared to the production volume of the end product) and the operating effort for the required mixing during the implementation.
  • the amount of Mg / Ca carbonate should at least correspond to the amount stoichiometrically required for the reaction with the acids.
  • the proportion of the carboxylic acid to be used in the warm process stage can be varied approximately in the range from 20 to 80% of the total amount required.
  • the amount of carboxylic acid to be introduced into the warm stage is preferably 40 to 60%, in particular 50% of the total amount.
  • a dry intermediate product results from the first process stage, which is mixed in the second process stage with the remaining amount of carboxylic acid and with the remaining amount of Mg / Ca carbonate. This mixing takes place at about room temperature, i.e. without additional expenditure of thermal energy.
  • the added amount of carboxylic acid reacts with a corresponding part of the Mg / Ca carbonate. This reaction ends when a neutral pH is reached.
  • the intermediate product obtained from the second stage of the process with the desired proportion of rock flour, preferably limestone flour, and an anti-caking and
  • Water repellents are mixed evenly. Since the hydrophobization of the intermediate product obtained from the second stage of the process is particularly important, it is advisable to mix it with the hydrophobizing agent at the end of the second stage of the process before or after reaching the neutral pH. This mixing must be carried out very intensively in a homogenization unit with additional mechanical action on the mix (e.g. in a pneumatic mixer with additional choppers). The requirements for mixing when adding the rock powder are lower.
  • the rock powder used should, if possible, have a grain size that is clearly below 200 ⁇ m, preferably below 90 ⁇ m.
  • the grain size is reduced to below 200 ⁇ m, preferably max., Before or during the mixing with the anti-caking and hydrophobizing agent. 90 ⁇ m.
  • This also has the advantage that the reaction can proceed much faster in the warm stage of the process, since the reactive surfaces are considerably enlarged. This allows the required
  • the anti-caking and waterproofing agent should have a grain size that is clearly below 90 ⁇ m. Are particularly suitable for the hydrophobization
  • the proportion of the anti-caking and hydrophobizing agent in the end product is preferably in the range from 1 to 8% by weight and is dependent on the effectiveness of the hydrophobizing agent.
  • acetic acid is preferred, other acids such as citric acid or formic acid can also be used in the process as organic carboxylic acids.
  • the elevated temperature in the first stage of the process should expediently
  • Range from 110 to 150 ° C can be selected.
  • the required residence time of the material in the first stage of the process can generally be limited to a duration of 20 to 60 minutes, typically 30 to 40 minutes. It is influenced by the selected temperature and by the desired proportions of the starting materials.
  • an intermediate product A was produced using the following quantitative proportions of starting materials (% by weight):
  • the dolomite used had a granularity of less than 90 ⁇ m.
  • the material was mixed intensively at a temperature of approx. 130 ° C. in a stirred container over a period of 90 min.
  • 4% of the dry intermediate A produced in this way were placed in a second container and mixed with 93% dolomite of the same granularity and with 3% acetic acid. After 6 days, this dry fine-grained mixture (intermediate B) showed a neutral pH, i. H. the conversion of the acetic acid with the dolomite was complete.
  • intermediate B 69% was mixed intensively in a pneumatic mixer with 26.5% fine-grained limestone powder (grain size below 90 ⁇ m) and 4.5% fine-grained anti-caking and hydrophobicizing agent, so that in the end a homogeneous hydrophobized. it resulted in a dry, fine-grained total mixture.
  • This agent could easily be used in bitumen-bound or cement-bound mixtures for the production of top layers for Process traffic areas.
  • the effects on freezing drop were excellent.
  • values in the range of - 2 to - 9 ⁇ C could be achieved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Architecture (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Road Paving Structures (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)

Abstract

L'invention concerne un procédé de production d'un agrégat utilisé pour la construction de routes, afin d'abaisser le point de gelée. L'invention se fonde sur le fait que les coûts de production comparativement élevés des agrégats connus sont dus aux besoins en énergie et à la complexité de l'installation requis pour mettre la première étape du procédé en ÷uvre, en d'autres termes, la réaction des acides utilisés (acide phosphorique et acide carboxylique organique) avec le matériau de départ broyé, de préférence de la dolomite, comprenant du carbonate de magnésium et du carbonate de calcium. Selon l'invention, il est prévu que la réaction ne soit effectuée à température très élevée qu'avec une partie du carbonate de magnésium/calcium. Ce n'est que dans une seconde étape du procédé, approximativement à température ambiante, que l'acide carboxylique résiduel et le volume résiduel de carbonate de Mg/Ca, sont mélangés au matériau sec à grains serrés obtenu après la première étape du procédé.
EP96914839A 1995-05-24 1996-04-26 Procede de production d'un agregat utilise pour la construction de routes Withdrawn EP0828795A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1995119977 DE19519977C1 (de) 1995-05-24 1995-05-24 Verfahren zur Herstellung eines Zuschlagstoffs für den Straßenbau
DE19519977 1995-05-24
PCT/DE1996/000774 WO1996037557A1 (fr) 1995-05-24 1996-04-26 Procede de production d'un agregat utilise pour la construction de routes

Publications (1)

Publication Number Publication Date
EP0828795A1 true EP0828795A1 (fr) 1998-03-18

Family

ID=7763335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914839A Withdrawn EP0828795A1 (fr) 1995-05-24 1996-04-26 Procede de production d'un agregat utilise pour la construction de routes

Country Status (4)

Country Link
EP (1) EP0828795A1 (fr)
AU (1) AU5684296A (fr)
DE (2) DE19519977C1 (fr)
WO (1) WO1996037557A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007063778B3 (de) * 2007-11-06 2014-07-31 Refratechnik Holding Gmbh Verfahren zur Herstellung feuerfester Leichtgranalien sowie nach dem Verfahren hergestellte Leichtgranalien

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2426200C3 (de) * 1973-06-13 1979-04-19 Plastiroute S.A., Genf (Schweiz) Bituminöses bzw. asphalthaltiges Mischgut zur Herstellung eines eine Eisbildung hemmenden und Schnee tauenden Straßenbelag
DE2919444C2 (de) * 1979-05-15 1983-03-03 Wibau Industrie und Verwaltung GmbH, 6466 Gründau Verfahren zur Aufbereitung von gieß- und/oder verdichtungsfähigen Asphaltbetonmassen für die Herstellung von flächigen Deckenbelägen und von flächigen Estrichbelägen in Gebäuden
DE3404271A1 (de) * 1984-02-03 1985-08-08 Mannesmann AG, 4000 Düsseldorf Feinkorngemisch
DE3808250A1 (de) * 1988-03-12 1989-09-21 Veba Oel Ag Strassenbelag aus einem asphaltmischgut mit einer eishemmenden komponente
DE3934657C2 (de) * 1989-10-13 1994-08-18 Mannesmann Ag Verfahren zur Herstellung eines nach außen hydrophobe Eigenschaften aufweisenden Feinkorngemisches
DE4129621A1 (de) * 1991-09-06 1993-03-11 Gruenau Gmbh Chem Fab Pulverfoermiger hydrophober fueller fuer bitumengebundene verkehrsflaechen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9637557A1 *

Also Published As

Publication number Publication date
DE19680395D2 (de) 1998-05-20
WO1996037557A1 (fr) 1996-11-28
DE19519977C1 (de) 1996-12-12
AU5684296A (en) 1996-12-11

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