Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/02—Agglomerated materials, e.g. artificial aggregates
  • C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B18/04—Waste materials; Refuse
  • C04B18/14—Waste materials; Refuse from metallurgical processes
  • C04B18/146—Silica fume
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/02—Selection of the hardening environment
  • C04B40/0263—Hardening promoted by a rise in temperature
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the invention relates to a method for manufacturing artificial aggregates.
• tire-road grip is an important characteristic considered for road safety. This adhesion depends on the tire, on the wearing course of the road, and, in particular on the micro-roughness of the aggregates which the wearing course comprises.
• the micro-roughness of the aggregates is an essential parameter for grip, because the roughness of the surface of the pavement depends on it. On wet roads, it is these roughnesses which allow the rupture of the film of water and therefore the dry contact between the roadway and the tire.
• Micro-roughness is an intrinsic characteristic of the aggregate.
• An object of the invention is to provide a method for manufacturing artificial aggregates which makes it possible to manufacture artificial aggregates at low cost and in large quantities.
• This object of the invention is achieved by the fact that the following steps are carried out: - a first material comprising particles is provided, - elements intended to form a second material are provided, - a predetermined quantity of said first material is mixed with a predetermined quantity of each of said elements of said second material, whereby a mortar formed of inclusions corresponding to the first material and a matrix corresponding to the second material is obtained, - a first treatment is applied to the mortar for a predetermined first treatment duration , and - said mortar is crushed to obtain artificial aggregates.
• the cure “curing” in English, means that the mortar is subjected to a treatment making it possible to manage the exchanges of water and / or heat with the external environment.
• the cures make it possible to prevent dehydration of the matrix and, on the contrary, promote hydration which tends to consolidate it. Consequently, the conditions (duration and temperature) in which this type of cure is practiced determine the consolidation of the matrix and therefore of the mortar.
• the first material has a hardness greater than that of the second material and forms hard inclusions in the mortar.
• the first material is preferably obtained from a source rock having good mechanical properties, in particular good resistance to wear and to fragmentation. Consequently, an original rock having values of Los Angeles coefficient less than 12 and of Micro-Deval coefficient less than 20 is preferably used for the first material.
• the mortar is hydrated, but that the cure allowing this hydration is not too long. Indeed, crushing after a short cure makes it possible to expose a certain number of inclusions and therefore to obtain a high roughness. Consequently, before crushing, the mortar is advantageously hydrated by a second cure, for a predetermined second cure duration, so that the adhesion in the mortar between the inclusions and the matrix is not too high.
• the duration of this second cure is limited so that the consolidation of the matrix is just sufficient so that, on the one hand, the inclusions adhere sufficiently in the matrix without detaching during crushing and, on the other hand, the ruptures caused by the crushing allow to reveal a damaged facies.
• the crushed mortar advantageously undergoes a third cure, by immersion in water, for a predetermined third cure duration, thus making it possible to perfect the hardening of the matrix within the crushed mortar.
• This maturation leads to the development of an inclusions / matrix adhesion which makes it possible to guarantee good joining of the two materials together and therefore to limit the risk of detachment of the inclusions.
• the first material advantageously comprises particles of size less than 1.5 mm.
• the inclusions are less than 1 mm in size.
• the fines that is to say the particles of substantially micrometric size, are advantageously removed by successive washes of the first material before mixing with the second material.
• the elements of the first material comprise a cement and a silica fume.
• the mortar is such that its compressive strength would be between 80 and 110 MPa after the third cure if it was not crushed. The adhesion of inclusions in the matrix depends, among other things, on the amount of water present.
• the single FIGURE schematically represents the steps of a preferred embodiment of the method making it possible to obtain artificial aggregates 10 from a mortar M12-14 obtained by a mixture of a first material 12 which comprises particles and which is called inclusions for the rest, and a second material 14 which is composed of several elements and which forms a matrix 14 for the mortar M12-14.
• the elements considered in the composition of the second material 14 intended to form the matrix 14 of the mortar M 12-14 are preferably chosen from cements, silica smoke, superplasticizers and water.
• the matrix 14 of the second material comprises a cement making it possible to obtain a mortar M12-14 whose compressive strength is between 90 MPa and 110 MPa, preferably of the order of 100 MPa.
• the matrix 14 is advantageously composed of a mixture of an amount Qi6 of a cement 16, preferably a cement of the aforementioned type “CEM I 52.5”, of an amount Qi ⁇ of silica smoke 18, d '' an amount Q20 of superplasticizer 20 and an amount Q22 of water 22.
• the amount Qi6 is between 600 Kg / m 3 and
• the quantity of water Q22 is advantageously determined so that the water / cement ratio is between 30% and 35%, preferably of the order of 33%. Consequently, with the abovementioned quantities Qi6 of cement, the quantity of water Q22 is preferably between 200 Kg / m 3 and 230 Kg / m 3 .
• a M12-14 mortar After mixing a quantity Q12, preferably between 1400 Kg / m 3 and 1600 Kg / m 3 of inclusions 12 with the abovementioned quantities of elements of the first material, a M12-14 mortar is obtained which has a quantity Q12 of inclusions in a matrix 14 in quantity Q14, preferably between 870 Kg / m 3 and 1015 Kg / m 3 , quantity Q14 which corresponds to the sum of the quantities of the aforementioned elements which are supplied.
• a first cure Tl of the mortar M12-14 in this case a conservation at room temperature ⁇ i and at least at 95% relative humidity, is then carried out for a duration of first cure tl, between 12 hours and 36 hours, preferably around 24 hours.
• the inclusions 12 and the elements of the second material 14 are preferably mixed simultaneously before having formed the matrix 14, that is to say directly the inclusions 12 with the cement 16, the silica smoke 18, the superplasticizer 20 and water 22.
• the inclusions 12 are preferably a sand, for example, a gneiss sand or a dioritic sand.
• the fluidity of the M12-14 mortar has been optimized to allow easy compaction in 4x4x16 cm 3 molds, using an impact table in accordance with standard EN 196-1; the mortar thus compacted forms M12-14 mortar specimens.
• the 4x4x16 cm 3 test tubes are removed from the mold, and a second cure T2 is applied to them, corresponding to soaking in water at temperature ⁇ 2, between 18 ° C and 25 ° C, preferably of the order of 20 ° C, for a duration of second cure t2, between 12 hours and 36 hours, preferably substantially equal to 24 hours.
• This second T2 treatment is performed to generate weak bonds in the M12-14 mortar intended to be crushed. After having carried out this second T2 treatment of the M12-14 mortar specimens, the latter are split in two, then crushed using a jaw crusher C.
• a third cure T3 by soaking in water at temperature ⁇ 2, between 35 ° C and 45 ° C, preferably of the order of 40 ° C, is then carried out for a duration of third cure t3 between 10 days and 15 days, to complete the hydration of the cement 16 which started during the second cure T2 and to consolidate the artificial grains 10 obtained, by consolidating the connections between the inclusions 12 and the matrix 14.
• this third cure T3 allows 'Obtain strong bonds which will limit the risks of detachment of inclusions 12.
• the mortar M12-14 matures and we obtain artificial grains 10 consolidated.
• Two compositions, indicated in the table below, are given by way of exemplary embodiments of artificial ranulates.
• a quantity Q12 substantially equal to 1412 Kg / m 3 of gneiss sand, is mixed with the elements of the second material in quantities corresponding to a quantity Q14, substantially equal to 946.3 Kg / m 3 .
• This quantity Qi4 corresponds substantially to the mixture of a quantity Qi6 of cement “CEM I 52.5” of the order of 652 Kg / m 3 , of a quantity Qi8 of silica smoke of the order of 65 Kg / m 3 , of a quantity Q20 of superplasticizer of the order of 12.3 Kg / m 3 and a quantity Q22 of water of the order of 217 Kg / m 3 .
• the gneiss sand Prior to mixing, the gneiss sand has preferably undergone sieving on a 1.5 mm sieve so as to keep as inclusions 12 only the grains of sand preferably less than or equal to 1.5 mm in size.
• This quantity Q14 corresponds substantially to the mixture of a quantity Qi6 of cement “CEM I 52.5” of the order of 673 Kg / m 3 , of a quantity Qi8 of silica smoke of the order of 68 Kg / m 3 , of a quantity Q20 of superplasticizer of the order of 13.0 Kg / m 3 and a quantity Q20 of water of the order of 223 Kg / m 3 .
• the dioritic sand prior to mixing, has preferably undergone sieving, but rather over a sieve of 1 mm so as to retain as particles, only the grains of sand preferably less than or equal to 1 mm in size .

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Organic Chemistry (AREA)
• Civil Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Health & Medical Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• Toxicology (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Road Paving Structures (AREA)
• Materials For Medical Uses (AREA)
• Prostheses (AREA)
• Dental Preparations (AREA)
• Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2003
  • 2003-08-08 FR FR0309770A patent/FR2858614B1/fr not_active Expired - Fee Related
• 2004
  • 2004-08-06 CA CA 2535321 patent/CA2535321A1/en not_active Abandoned
  • 2004-08-06 WO PCT/FR2004/002102 patent/WO2005016848A2/fr not_active Ceased
  • 2004-08-06 US US10/567,465 patent/US7678322B2/en not_active Expired - Fee Related
  • 2004-08-06 EP EP04786275A patent/EP1663902A2/de not_active Withdrawn

Non-Patent Citations (1)

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