WO2023012423A1 - Utilisation d'une fraction obtenue à partir d'un béton usagé comme sable pour la préparation de béton ou mortier - Google Patents
Utilisation d'une fraction obtenue à partir d'un béton usagé comme sable pour la préparation de béton ou mortier Download PDFInfo
- Publication number
- WO2023012423A1 WO2023012423A1 PCT/FR2022/051533 FR2022051533W WO2023012423A1 WO 2023012423 A1 WO2023012423 A1 WO 2023012423A1 FR 2022051533 W FR2022051533 W FR 2022051533W WO 2023012423 A1 WO2023012423 A1 WO 2023012423A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fraction
- concrete
- use according
- sand
- mortar
- Prior art date
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 65
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 21
- 239000004576 sand Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 27
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 28
- 238000004519 manufacturing process Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 17
- 239000004035 construction material Substances 0.000 description 12
- 239000011398 Portland cement Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000001033 granulometry Methods 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
Definitions
- the subject of the present invention is the upgrading of concrete at the end of its life, and more particularly the use of a fraction obtained from a carbonated used concrete as a substitute sand for the preparation of concrete or mortar.
- Building materials are materials used in the construction and public works sectors. They cover a wide range of materials, which mainly includes wood, glass, steel, aluminium, textiles, plastics (particularly insulation) and materials resulting from the transformation of quarry products, which can be more or less elaborate, in particular concrete, mortars and various derivatives of clay such as bricks, tiles, tiling and various sanitary elements.
- cements essentially consists of calcining a mixture of carefully chosen and dosed raw materials, also referred to by the term “raw”. Firing this cru gives an intermediate product, clinker, which, ground with any mineral additions, will give cement.
- the type of cement manufactured depends on the nature and proportions of the raw materials as well as the firing process.
- Portland cements which represent the vast majority of cements produced in the world
- aluminous cements or calcium aluminate
- natural quick cements sulpho-aluminous cements
- cements sulfo-belitic and other intermediate varieties.
- the most common cements are Portland type cements.
- Portland cements are obtained from Portland clinker, obtained after clinkering at a temperature of around 1450°C of a raw material rich in calcium carbonate in a kiln.
- the production of one tonne of Portland cement is accompanied by the emission of very large quantities of CO2 (approximately 0.8 to 0.9 tonnes of CO2 per tonne of cement in the case of a CEM I).
- Decarbonation is a chemical reaction that takes place when limestone, the main raw material for the manufacture of Portland cement, is heated at high temperature. The limestone is then transformed into quicklime and CO2 according to the following chemical reaction:
- the described process involves using recycled concrete fines comprising supplying recycled concrete fines with dgo 1000 ⁇ m to stockpiles or a silo as a feedstock, rinsing the feedstock to provide carbonaceous material, removing of the carbonaceous material and the cleaned exhaust, and the deagglomeration of the carbonaceous material to form the additional cementitious material, as well as the use of stockpiles or a silo containing a feedstock of recycled concrete fines with dgo 1000 pm for the cleaning of CO2-containing exhaust gases and the simultaneous production of additional cementitious material.
- this process requires the carbonated product to be dried before it can be used.
- the subject of the present invention is the use of a fraction whose particle size d is greater than or equal to 150 ⁇ m, said fraction having a loss on ignition varying from 3% to 30% and comprising:
- the fractions defined previously, by carbonation of a fraction obtained from a construction material, in particular a concrete, at the end of its life, in which the finest particles have been removed can be used as sands for the preparation of mortars or concretes, which makes it possible to recycle used concrete and to preserve natural resources while maintaining resistance mechanical properties comparable to those of concrete or mortars prepared from conventional sands.
- the fraction obtained from used construction materials must first be carbonated, this makes it possible to significantly reduce the general carbon footprint associated with the production of new construction materials such as concrete or mortar.
- sand means any sand that can be used by a person skilled in the art for the preparation of construction material
- loss on ignition means the cumulative content of bound water, organic matter, CO2 of carbonates (calcareous loads and carbonated part of the material) and any oxidizable elements.
- the loss on ignition is determined by calcination in air at a temperature of (950 +/- 25°C) according to the method described in standard NF EN 196-2 (classification index P 15-472) - Methods of cement testing - Part 2: Chemical analysis of cements; And
- construction material means concrete or mortar.
- dw corresponds to the diameter below which there is 10% of the total mass of the particles of the sample considered. This can be determined by any method known to those skilled in the art, in particular by dry or wet laser granulometry.
- “dgo” corresponds to the diameter below which 90% of the total mass of the particles of the sample considered is found. This can be determined by any method known to those skilled in the art, in particular by dry or wet laser granulometry.
- the diameter of the particles can be determined by any method known to those skilled in the art, in particular by scanning electron microscopy, morphogranulometry or by laser granulometry.
- the proportions expressed in % correspond to mass percentages relative to the total weight of the entity (eg clinker or cement) considered.
- a subject of the present invention is therefore the use of a fraction having the characteristics, in particular grain size and mineralogical characteristics, described previously as sand for the production of concrete or mortar.
- the subject of the present invention is the use of a fraction as defined above as sand for the production of concrete or mortar, said fraction having the following characteristics, chosen alone or in combination: the particle size dw of the fraction is greater than or equal to 180 pm. More preferably, the particle size dw of the fraction is greater than or equal to 200 ⁇ m.
- the particle size dw of the fraction is greater than or equal to 250 ⁇ m; the dgo particle size of the fraction is less than or equal to 4000 pm. More preferably, the dgo particle size of the fraction is less than or equal to 3000 ⁇ m. Quite preferably, the dgo particle size of the fraction is less than 2000 ⁇ m; the fraction has a loss on ignition varying from 4% to 25%, more preferably from 6% to 20%; the fraction contains 30% to 70% SiC>2. More preferably, the fraction contains from 40% to 60% SiO 2 ; the fraction contains 10% to 30% CaO. More preferably, the fraction contains from 10% to 20% CaO; the fraction contains 2% to 10% Al 2 O 3 .
- the fraction contains from 4% to 8% of Al 2 O 3 ; the fraction contains 1% to 3% Fe 2 O 3 . More preferably, the fraction contains from 1% to 2.5% of Fe 2 O 3 ; the fraction additionally contains from 0.1% to 3%, preferably from 0.5% to 2% of MgO; the fraction also contains from 0.05% to 2%, preferably from 0.1% to 1% of TiO 2 ; the fraction also contains from 0.1% to 3%, preferably from 0.5% to 2.5% of K 2 O; the fraction also contains from 0.05% to 2%, preferably from 0.1% to 1%, of Na 2 O; the fraction also contains from 0.01% to 1%, preferably from 0.05% to 0.5% of P 2 Os; the fraction also contains from 0.005% to 0.2%, preferably from 0.01% to 0.1% of Mn 2 O 3 ; and/or the fraction additionally contains from 0.05% to 3%, preferably from 0.1% to 1.5%, of SO 3 .
- the fraction described above is therefore obtained by carbonation of a fraction obtained from a construction material, in particular a concrete, at the end of its life.
- the present The subject of the invention is also a method for preparing a fraction as described previously, said method comprising the following steps: iron removal and crushing of the construction material; screening of the crushed product in order to obtain a fraction with the desired dgo; drying of the fraction thus obtained; separation using a dynamic separator to obtain the fraction with the desired d; and carbonating the fraction obtained by with a gas containing CO2, such as a cement gas.
- the removal of iron and the crushing of the construction material can be carried out according to any method known to those skilled in the art, in particular by shearing the scrap metal from the concrete then by magnetic removal by "omeric” and finally crushing of the construction material by a crusher with percussion, for example, which favors the reduction of the size of the aggregates.
- Sifting is a mechanical operation carried out using devices commonly called sieves which makes it possible to select the grains.
- the sieve only lets through its mesh elements smaller than a certain size. They are equipped with perforated grids with openings of a size determined according to the size of the grains sought. There are inclined vibrating screens and horizontal vibrating screens.
- the screening can be carried out according to any method known to those skilled in the art.
- the fraction obtained after screening is a 0/4 mm fraction, preferably 0/2 mm.
- the fines fractions are obtained by using a dynamic separator which separates the particles it receives according to their size, shape and density.
- the product feeding the separator falls on the rotating distribution hub.
- the centrifugal force throws the particles: the coarser ones are thrown towards the periphery, their speed decreases and, under the action of gravity, fall into the refusal cone from where they are evacuated to then be carbonated.
- the finer particles are drawn by the rising air towards the separation zone where variable pitch selection vanes impart an additional centrifugal force to them which removes the remaining coarse particles.
- the speed of rotation, the ventilation and the angle of the blades of the turbine makes it possible to adjust the desired particle size. If the ventilation of the separator is provided by hot air, it also has the ability to dry the materials.
- the fraction described above can therefore be used as sand for preparing a concrete or a mortar without this affecting the properties, in particular mechanical properties, of said concrete or mortar.
- the rate of substitution of the natural sand used to prepare the concrete or the mortar by the fraction described above can be up to 70%, more preferably up to 50%, very preferably up to 30% .
- a sieve with a square mesh of variable size was used to proceed with the elimination of the finest particles except for the F-0 fraction which corresponds to raw "concrete sand", i.e. without removal of finest particles.
- fractions retained by the sieve i.e. refusal
- a bottled gas mixture containing 25% CO2 for 6 hours with stirring in a heated mixer (temperature set at 55°C).
- Table 1 Mineralogical composition and particle size of fractions F-0 to F-3.
- Example 2 Concretes/mortars
- concrete 3 is prepared with the same elements as concrete 1 but substituting
- the compressive strength of concretes 1 to 3 was measured according to standard NF EN 12390-3 on test specimens measuring 11x22cm after 7 and 28 days of wet curing (20°C).
- concretes 3 and 4 have a carbon balance reduced by 8.5% and 10.8% respectively.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Glass Compositions (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2108400A FR3125814A1 (fr) | 2021-08-02 | 2021-08-02 | Utilisation d’une fraction obtenue à partir d’un béton usagé comme sable pour la préparation de béton ou mortier |
FR21/08400 | 2021-08-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023012423A1 true WO2023012423A1 (fr) | 2023-02-09 |
Family
ID=78536323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2022/051533 WO2023012423A1 (fr) | 2021-08-02 | 2022-08-01 | Utilisation d'une fraction obtenue à partir d'un béton usagé comme sable pour la préparation de béton ou mortier |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR3125814A1 (fr) |
WO (1) | WO2023012423A1 (fr) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019115722A1 (fr) | 2017-12-13 | 2019-06-20 | Heidelbergcement Ag | Procédé pour réaliser de manière simultanée le nettoyage de gaz d'échappement et la fabrication de matériau cimentaire supplémentaire |
-
2021
- 2021-08-02 FR FR2108400A patent/FR3125814A1/fr active Pending
-
2022
- 2022-08-01 WO PCT/FR2022/051533 patent/WO2023012423A1/fr active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019115722A1 (fr) | 2017-12-13 | 2019-06-20 | Heidelbergcement Ag | Procédé pour réaliser de manière simultanée le nettoyage de gaz d'échappement et la fabrication de matériau cimentaire supplémentaire |
Non-Patent Citations (2)
Title |
---|
"Feasability and performance analysis of carbonated recycled aggregate concrete", INTERNATIONAL JOURNAL OF SUSTAINABLE ENGINEERING, vol. 14, no. 4, 2021, pages 761 - 775 |
SINGH MANPREET ET AL: "Feasibility and performance analysis of carbonated recycled aggregate concrete", INTERNATIONAL JOURNAL OF SUSTAINABLE ENGINEERING, vol. 14, no. 4, 6 December 2020 (2020-12-06), pages 761 - 775, XP055904321, ISSN: 1939-7038, DOI: 10.1080/19397038.2020.1856967 * |
Also Published As
Publication number | Publication date |
---|---|
FR3125814A1 (fr) | 2023-02-03 |
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