EP3849953A1 - Procede de traitement de granulats recycles, et utilisation des granulats ainsi traites - Google Patents
Procede de traitement de granulats recycles, et utilisation des granulats ainsi traitesInfo
- Publication number
- EP3849953A1 EP3849953A1 EP19790638.1A EP19790638A EP3849953A1 EP 3849953 A1 EP3849953 A1 EP 3849953A1 EP 19790638 A EP19790638 A EP 19790638A EP 3849953 A1 EP3849953 A1 EP 3849953A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aggregates
- water
- recycled
- repellent agent
- drying
- 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.)
- Pending
Links
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
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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 present invention relates to the field of building and construction, and more specifically to the field of recycling of building materials.
- the invention relates to a method for treating aggregates resulting from the deconstruction of concrete elements, and the use of the aggregates thus treated for the preparation of mortars or concretes.
- the coarse fraction> 4 mm In the granular skeleton of concrete, there are two types of fractions, the coarse fraction> 4 mm and the sand fraction from 0 to 4 mm.
- the standard NF EN206 / CN makes it possible to replace up to 30% of natural aggregates with a coarse fraction> 4 mm by recycled aggregates of the same particle size for structural concrete.
- the wish, in the short term, is to promote the protection of resources and the recovery of waste in order to partially meet the expectations of the Grenelle Environment Forum and European regulations which provide for reaching a 70% substitution rate of here by 2020.
- the recycled aggregate from deconstruction concrete is composed of the old aggregate natural which is attached to the old cement paste.
- the latter is porous and cracked during the crushing process.
- the porosity of recycled aggregates generates a significant increase in the water absorption coefficient and its kinetics [3,9] and a decrease in resistance to fragmentation of the recycled aggregate [10].
- recycled aggregates also depend on the granular fraction.
- the coarse fraction > 4 mm and the sand fraction from 0 to 4 mm.
- Recycled sand has a very high water absorption compared to the large fraction and more affects the properties of concrete (in the fresh and hardened state) compared to the large fraction [4,7,8]. Due to this effect, recycled sand is not recommended by standard NF EN206 / CN.
- NF EN206 / CN Several studies have been carried out to characterize concrete made from recycled aggregates. They have shown that their physical and mechanical properties decrease in proportion as the substitution rate for recycled aggregates increases in the composition [1,5-8]. To increase this rate in favor of recycling aggregates, several approaches have been proposed:
- the first consists in improving the quality of the binder for concretes containing recycled aggregates by modifying the formulation of the concrete, the simplest way is to reduce the W / L ratio which will play a role in improving the porosity and the permeability of concrete but requires increasing the quantity of cement [4,5,8], which increases the cost of concrete as well as the C0 2 emissions during the manufacture of Portland clinker.
- the second approach consists in improving the properties of the recycled aggregates before their incorporation into concrete.
- various treatments for improving the properties of recycled aggregates have been proposed [12,13]; these treatments based on silane and / or siloxane, which relate to the coarse fraction of aggregates, however generate a significant drop in the compressive strength of the concrete, which is in all likelihood explained by poor compatibility with the new cement paste .
- the present invention relates to a process for treating recycled aggregates of particle size less than or equal to 4 mm, which comprises drying said aggregates; impregnating the dried aggregates, in a closed receptacle, with a compound chosen from: a water-repellent agent based on silicone resin and / or silane and / or siloxane; sodium silicate; colloidal silica; and an alkali based on (OH); and drying the impregnated aggregates.
- the invention also relates to the recycled aggregates obtained by the above-mentioned process.
- the invention further relates to a concrete or a mortar containing, as granular skeleton, at least 50% by mass and up to 100% by mass of recycled aggregates obtained by the above-mentioned process.
- FIG. 1 represents the result of the compressive strength, in wet cure and in dry cure, of mortars based on natural aggregates, untreated recycled aggregates, and recycled aggregates treated according to the process of the invention.
- FIG. 2 represents the porosity, in wet cure and in dry cure, of mortars based on natural aggregates, untreated recycled aggregates, and recycled aggregates treated according to the process of the invention.
- FIG. 3 represents the intrinsic permeability, in wet cure and in dry cure, of mortars based on natural aggregates, untreated recycled aggregates, and recycled aggregates treated according to the process of the invention.
- Figure 4 represents the coefficient of diffusion of chloride ions in wet cure and in dry cure, mortars based on natural aggregates, untreated recycled aggregates, and recycled aggregates treated according to the process of the invention.
- FIG. 5 represents the carbonation front, in wet cure and in dry cure, of mortars based on natural aggregates, untreated recycled aggregates, and recycled aggregates treated according to the process of the invention.
- Figures 7A and 7B show the result of the treatment of the recycled aggregates according to Example 1.
- Figures 8A and 8B represent the result of the treatment of the recycled aggregates according to Comparative Example 1.
- Figures 9A and 9B show the result of the treatment of the recycled aggregates according to Example 2.
- Figures 10A and 10B show the result of the treatment of the recycled aggregates according to Comparative Example 2.
- M-SN mortar containing exclusively natural aggregates.
- M-SR mortar containing exclusively untreated recycled aggregates.
- M-Pl, M-P2, M-P3 mortar containing exclusively recycled aggregates treated according to the process of the invention.
- the left bar (dark) represents, for each type of aggregates, the result in wet curing
- the right bar (clear) represents, for each type of aggregates, the result in dry curing.
- the present invention aims to improve the microstructure of recycled aggregates from the sand fraction and the transition zone interface (ITZ) between the recycled aggregates and the cementitious paste from the mortar or concrete incorporating these recycled aggregates.
- ITZ transition zone interface
- the inventors are convinced that the quality of the structure of GITZ greatly influences the performance of cementitious materials (concrete and mortar) based on recycled aggregates, such as the mechanical strength and the durability properties of screws. -to corrosion of reinforcing steel (carbonation and diffusion of chloride ions).
- the invention relates to a process for treating recycled aggregates with a particle size less than or equal to 4 mm, which comprises:
- Recycled aggregates is understood to mean aggregates coming mainly from scrap concrete production, or from the selective deconstruction of works or buildings containing concrete elements. These recycled aggregates are typically obtained by crushing and screening existing concrete. Indeed, the recycled aggregate is composed of the old natural aggregate which is attached to the old cement paste.
- the invention advantageously relates to the sand fraction of the recycled aggregates, that is to say the aggregates having a particle size less than or equal to 4 mm, typically in the range 0.5 mm - 4 mm.
- Step a) consists in drying the recycled aggregates, typically in an oven, advantageously at a temperature in the range of 20 to 60 ° C, for example from 20 to 50 ° C, from 20 to 45 ° C, from 20 to 40 ° C, or from 20 to 35 ° C.
- the duration of this drying step depends, it will be understood, on the temperature used, the objective being to obtain a water content of less than 1% by mass, preferably less than or equal to 0.1% by mass .
- Step b) consists of impregnating the dried recycled aggregates, in a closed receptacle, with a compound chosen from: a water-repellent agent chosen from a water-repellent agent based on silicone resin and optionally silane and / or siloxane, and an agent water repellent based on silane and siloxane; sodium silicate; colloidal silica; and an alkali based on (OH).
- the water-repellent agent is a water-repellent agent based on silicone resin and optionally silane and / or siloxane, preferably a water-repellent agent based on silicone resin, silane and siloxane.
- the water-repellent agent is a water-repellent agent based on silane and siloxane (it is understood in this case that the water-repellent agent is free of silicone resin).
- the water repellent agent is advantageously in the form of an emulsion, preferably an oil-in-water emulsion.
- the water-repellent agent is in the form of a dilution, up to about 20 to 30%, of the commercial product in water.
- sodium silicate capable of being used in the context of the present invention mention may be made of solutions having a Na 2 O / SiO 2 molar ratio of less than or equal to 0.5, preferably less than or equal to 0, 4. Such solutions are commercially available, for example from the companies SILMACO or VWR.
- the commercial sodium silicate solution is diluted in water before use, up to about 5 to 15%.
- colloidal silica capable of being used in the context of the present invention, mention may be made of colloidal silica solutions having a pH of at least 10 and a particle size of less than approximately 50 nm, preferably less than approximately 15 nm and a minimum concentration of 20% in Si0 2 .
- colloidal silica solutions having a pH of at least 10 and a particle size of less than approximately 50 nm, preferably less than approximately 15 nm and a minimum concentration of 20% in Si0 2 .
- Such solutions are commercially available, for example from the company MERCK, and can be used as such.
- alkali based on (OH) capable of being used in the context of the present invention, there may be mentioned alkaline solutions of soda, potassium hydroxide or calcium hydroxide, of pH greater than or equal to 12. Such solutions are commercially available, for example from the company VWR, and can be used as such.
- the receptacle capable of being used in the context of the present invention will be chosen by a person skilled in the art according to the scale of the impregnation reaction implemented (laboratory, pilot, industrial). It is essential that the receptacle is closed during the impregnation of the aggregates.
- the duration of step b) is less than or equal to 24 hours, for example included in the range going from 1 to 24 hours, preferably in the range going from 6 hours to 24 hours, more preferably in the range ranging from 10 to 24h.
- the volume ratio between the compound and the dried recycled aggregates is in the range of about 3: 1 to about 1: 1, preferably in the range range from about 2: 1 to about 1: 1.
- the “volume” of the compound refers to the volume of the emulsion or of the solution (containing the compound) used, where appropriate after possible dilution in a solvent such as water.
- Step c) consists in drying the impregnated aggregates advantageously at a temperature in the range from 20 to 60 ° C, for example from 20 to 50 ° C, from 20 to 45 ° C, from 20 to 40 ° C, or alternatively from 20 to 35 ° C.
- the duration of this drying step depends on the temperature used, the objective being to obtain a water content in the recycled aggregates of less than 1% by mass, preferably less than or equal to 0 , 1% by mass.
- the method according to the invention comprises the following steps between steps a) and b): a1) impregnation, in a closed receptacle, of the dried aggregates of step a) with an alkali based on (OH), as described above; a2) the impregnated aggregates are removed from the receptacle and optionally dried, preferably at room temperature (20-25 ° C), to then be used in step b).
- the duration of step a1) and the volume ratio between the alkali based on (OH) and the dried aggregates are as indicated above for step b).
- the process according to the invention comprises the following steps between steps b) and c): bl) drying the impregnated aggregates, preferably at room temperature (20-25 ° C); b2) impregnating, in a closed receptacle, the aggregates dried in step b1) with a water-repellent agent as described above.
- the duration of step b2) and the volume ratio between the water-repellent agent and the dried aggregates are as indicated above for step b).
- the method according to the invention comprises the following steps between steps b) and c): bl) the impregnated aggregates are removed from the receptacle and optionally dried, preferably at room temperature (20-25 ° C); b2) the impregnation, in a closed receptacle, of the aggregates optionally dried with a colloidal silica as described above, and which can be the same as in step b).
- the duration of step b2) and the volume ratio between the colloidal silica and the dried aggregates are as indicated above for step b).
- the process according to the invention comprises the following steps between steps b) and c): bl) the impregnated aggregates are removed from the receptacle and optionally dried, preferably at room temperature (20-25 ° C); b2) the impregnation, in a closed receptacle, of the aggregates optionally dried with an alkali based on (OH) as described above, and which can be the same as in step b).
- the duration of step b2) and the volume ratio between the alkali and the dried aggregates are as indicated above for step b).
- the recycled aggregates treated according to the process according to the invention have a reduction in water absorption compared to untreated recycled aggregates, due to the reduction of the porosity at the microstructure of the treated recycled aggregates.
- the treated recycled aggregates also act on the surface, when incorporated into a “new” cementitious paste, they exhibit very good adhesion with this “new” cementitious paste, which results in a reduction in the porosity at I ⁇ TZ level. "new" cement paste.
- the recycled aggregates treated according to the process according to the invention give the latter, in addition to good compressive strength, good durability properties, in particular good resistance to corrosion. of steel reinforcements (contained in concrete) caused by chloride ions and by C0 2 .
- the invention relates to recycled aggregates, of particle size less than or equal to 4 mm, obtained by the treatment process according to the invention.
- the invention also relates to a mortar or a concrete containing, in addition to water and a hydraulic binder, aggregates formed for 50% to 100% by mass by the recycled aggregates obtained by the treatment process in accordance with the invention.
- the mortar or concrete therefore comprises at most 50% by mass of natural aggregates or untreated recycled aggregates, as defined in standard EN 12620.
- the recycled aggregates treated according to the process according to the invention represent at least 60% by mass, at least 70% by mass, at least 80% by mass, or at least 90% by mass, of the total mass of aggregates present in the mortar or concrete.
- the hydraulic binder present in the mortar or concrete is a finely ground mineral material comprising a cement and possibly one or more mineral additions and which, mixed with water, hardens as a result of reactions and processes. hydration.
- the hydraulic binder is advantageously in the form of a pulverulent particle size such that at least 90% of the particles pass through a sieve of 200 ⁇ m (D 90 ⁇ 200 ⁇ m).
- the cement is typically a Portland clinker cement such as those defined in standard EN 197-1.
- the mineral additions may be granulated blast furnace slag such as those defined in standard EN 15167-1, fly ash for concrete such as those defined in standard EN 450-1, metakaolins for concrete such as those defined in standard EN 206 / CN, limestone additions such as those defined in standard NF P 18-508, siliceous additions such as those defined in standard NF P 18-509, or any mixture of the above-mentioned constituents.
- the mineral additions are used in proportions such that their mass ratio to the cement is advantageously between approximately 0.1 / 1 and approximately 4/1, preferably between approximately 0.1 / 1 and about 3/1.
- the mortar or concrete can also include one or more additives such as viscosity agents (XP P 18-340), setting or hardening accelerators, setting retarders, plasticizers or superplasticizers, in particular superplasticizers of the family polycarboxylates, polynaphthalene sulfonates, melamine sulfonates or lignosulfonates.
- the mass proportion of adjuvants (when they are present), relative to the hydraulic binder is in the range from approximately 0.1% to approximately 3.5% in dry extract, preferably in the range of approximately 0, 5% to around 1.5% as dry extract.
- the treated recycled aggregates can completely replace natural aggregates in the formulation of a mortar or concrete, without modification of this formulation (mainly, without adding cement);
- the cost of the final product is reduced compared to a mortar or concrete containing untreated recycled aggregates, which requires a larger quantity of hydraulic binder to obtain equivalent performance;
- a concrete incorporating the recycled aggregates treated according to the process of the invention has improved properties in terms of water absorption coefficient, compressive strength, durability of the concrete with respect to the risk of corrosion d reinforcement by carbonation and by diffusion of chloride ions, compared to a concrete incorporating only natural aggregates (ie not recycled).
- the dried aggregates were then placed in a bottle in order to be impregnated with the water-repellent agent used in Example 1, at the rate of 2 volumes of diluted emulsion for one volume of aggregates.
- the bottle was closed and the impregnation took place for 24 hours.
- colloidal silica product marketed under the name Klebosol TM 30R12
- the amounts indicated in Table 1 are percentages by mass.
- the natural aggregates are of the Seine sand type, and have a particle size of 0.5-4 mm.
- the untreated recycled aggregates come from a recycling platform, and have a particle size of 0.5-4 mm.
- the cement used is a CEM I 52.5 CP2 NF type clinker.
- Test pieces were prepared from each of the mortars indicated in the table
- the mechanical resistance to compression (Rc) of the test pieces was measured after 28 days of curing, according to the principle of standard EN 12390-3.
- the durability properties of the test pieces (porosity to water, diffusion of chloride ions, depth of carbonation) were measured after 90 days of treatment, according to the AFGC guide [15].
- FIG. 1 shows that the compressive strength of mortars comprising 100% of recycled aggregates treated (i) is comparable to or greater than that of mortar comprising 100% natural aggregates, and (ii) significantly greater than that of mortar comprising 100% untreated recycled aggregates.
- FIG. 2 shows that the porosity of the mortars comprising 100% of recycled aggregates treated is comparable or slightly lower than that of the mortar comprising 100% of natural aggregates.
- FIG. 3 shows that the permeability in dry curing of mortars comprising 100% of recycled aggregates treated (i) is comparable or lower than that of mortar comprising 100% of natural aggregates, and (ii) significantly lower than that of mortar comprising 100% of untreated recycled aggregates. This indicates that the mortars according to the invention have good water tightness.
- Figure 4 shows that the chloride ion diffusion coefficient of mortars comprising 100% of recycled aggregates treated (i) is comparable or lower than that of mortar comprising 100% natural aggregates, and (ii) significantly higher than that of mortar comprising 100% untreated recycled aggregates. This indicates that the mortars according to the invention have a good capacity for resistance to attack by chloride ions.
- FIG. 5 shows that the depth of carbonation of the mortars comprising 100% of recycled aggregates treated is, after 60 days, less than that of the mortar comprising 100% of natural aggregates and that of the mortar comprising 100% of untreated recycled aggregates . This indicates that the mortars according to the invention have a good capacity for resistance to attack by C0 2 .
- Example 7
- Example 2 The procedure of Example 1 was repeated, but without closing the bottle in which the recycled aggregates were placed. As can be seen in FIGS. 8A and 8B, the recycled aggregates stick to each other and also to the bottle. Comparative example 2
- Example 2 The procedure of Example 2 was repeated, but without closing the bottle in which the recycled aggregates were placed. As can be seen in FIGS. 10A and 10B, the recycled aggregates stick to each other and also to the bottle.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1858082A FR3085678B1 (fr) | 2018-09-10 | 2018-09-10 | Procede de traitement de granulats recycles, et utilisation des granulats ainsi traites |
PCT/FR2019/052072 WO2020053513A1 (fr) | 2018-09-10 | 2019-09-09 | Procede de traitement de granulats recycles, et utilisation des granulats ainsi traites |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3849953A1 true EP3849953A1 (fr) | 2021-07-21 |
Family
ID=65201337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19790638.1A Pending EP3849953A1 (fr) | 2018-09-10 | 2019-09-09 | Procede de traitement de granulats recycles, et utilisation des granulats ainsi traites |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3849953A1 (fr) |
FR (1) | FR3085678B1 (fr) |
WO (1) | WO2020053513A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111485716A (zh) * | 2020-04-13 | 2020-08-04 | 中国矿业大学 | 一种废弃混凝土大骨料在混凝土结构施工中的应用 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4389074B2 (ja) * | 2004-11-25 | 2009-12-24 | 義和 花田 | 廃棄物由来着色骨材の製造方法 |
KR100919493B1 (ko) * | 2008-01-16 | 2009-09-28 | 박신 | 수성발수제로 피복된 순환골재와 이를 이용한 콘크리트조성물 |
CN101624268B (zh) | 2009-08-07 | 2012-02-08 | 武汉理工大学 | 一种废弃混凝土再生骨料的处理剂及处理方法 |
CN102092993A (zh) | 2010-11-25 | 2011-06-15 | 浙江大学 | 一种再生骨料混凝土的纳米强化方法 |
CN102786243B (zh) | 2012-07-27 | 2014-07-09 | 深圳大学 | 一种改性再生骨料和再生骨料高性能混凝土 |
CN104628282B (zh) | 2015-01-30 | 2016-11-30 | 淮安市建筑工程检测中心有限公司 | 一种再生骨料表面处理剂及其使用方法 |
CN105461248B (zh) | 2015-11-20 | 2017-09-19 | 广西壮族自治区水利科学研究院 | 一种再生骨料的改性方法及改性再生骨料混凝土 |
-
2018
- 2018-09-10 FR FR1858082A patent/FR3085678B1/fr active Active
-
2019
- 2019-09-09 WO PCT/FR2019/052072 patent/WO2020053513A1/fr unknown
- 2019-09-09 EP EP19790638.1A patent/EP3849953A1/fr active Pending
Also Published As
Publication number | Publication date |
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FR3085678B1 (fr) | 2021-07-02 |
WO2020053513A1 (fr) | 2020-03-19 |
FR3085678A1 (fr) | 2020-03-13 |
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