• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method of manufacturing a carrier concrete based on flax shives, said method having a phase of coating the flax shives comprising the following steps: incorporation into a shredder of linen in a aqueous mixture comprising at least one inorganic binder; a brewing inerting treatment of the flax shives and the aqueous mixture comprising the at least one inorganic binder for penetration of said aqueous mixture into the pores and channels of said flax shives; and curing the flax shives by drying to seal said pores and solidification of the flax shives to obtain coated flax shives.
    公开号:BE1025979B1
    申请号:E2019/5022
    申请日:2019-01-15
    公开日:2019-09-03
    发明作者:Blaise Dupre；Boubker Laidoudi
    申请人:L.A. Liniere；
    IPC主号:
    专利说明:

    BE2019 / 5022 CONSTRUCTING MATERIAL OF THE CONCRETE TYPE COMPRISING LINED PINEAPPLE
    Technical field and prior art
    The present invention relates to the building field, and more particularly to the manufacture of a concrete-type building material based on flax aggregates (or flax shives).
    The object of the present invention relates more specifically to a concrete based on linseed shives, known as linseed concrete, which is carrier and contains flax aggregates coated with a milk of mineral binder such as for example lime. and / or cement, and optionally a surfactant and / or a plasticizer.
    By load-bearing concrete is understood here a concrete intended to be used in the construction of a masonry element such as for example the construction of a load-bearing wall. Such flax concrete is said to be load-bearing because it has a compressive strength of between 3 and 7 MPa.
    By linseed aggregates or linseed anas within the meaning of the present invention is understood throughout the following description by-products from flax scutching lines. The shives generally have a length of less than 250 mm and a density of between 75 and 105 kg / m3. These shives are most often the co-products of scutching lines after the step of defibering the flax.
    The use of these flax shives in the manufacture of concrete finds many advantageous applications in the construction industry, and in particular the building industry and in particular the construction of new buildings.
    Concrete is a composite building material which, conventionally, is made from mineral aggregates (gravel larger than 1 cm), agglomerated by a powdery mineral binder (for example cement, lime or calcium sulphate) .
    Mortar is also a composite building material made in particular from aggregates (gravel less than 1 cm in size) agglomerated by a powdery mineral binder similar to that of concrete.
    Generally, whether it is a concrete or a mortar, the mineral binder is hydrated, in other words brought into contact with water during a mixing process called "mixing" allowing agglomeration aggregates.
    We are talking about concrete (or mortar) based on hydraulic binders.
    2019/5022
    BE2019 / 5022
    Conventional concrete manufacturing techniques are widely known from the state of the art.
    However, we know that the building sector strongly affects the environment through the consumption of natural resources and energy.
    This consumption is accompanied by emissions of waste and pollutants acting on the global, local and indoor climate.
    In this context, it is preferable that the constructions are energy efficient and use materials with low environmental and health impacts.
    Thermal regulations are thus gradually being strengthened in order to limit the energy needs of buildings; To this end, we note that many labels have been created in order to encourage technological innovation around these energy reductions.
    Thus, the requirements of the different thermal regulations and the development of several labels, lead to the use of increasingly airtight and very efficient envelopes in terms of thermal insulation.
    In parallel, incentives are proposed in favor of bio-based materials so that they take an important part in the composition of building materials.
    It is thus noted that one of the objectives set at the end of the Grenelle is to reach 10% of bio-based materials in the building, excluding timber, by 2020.
    Among these bio-based materials, concrete incorporating plant particles such as hemp, linou and miscanthus concretes meet these challenges.
    The development of agricultural products for non-food purposes has therefore taken on a new dimension in recent decades: a new era is opening up for plants thanks to advances in research in the field of building materials.
    Concrete has been known since the 1990s, incorporating hemp from the hemp plant.
    The hemp seed, rich in lignins, is the internal part of the textile hemp stem.
    The publication in 2007 of professional rules for the execution of works in hemp concrete shows the maturity and the desire to structure this sector.
    The latter is organized to provide sufficient quantities of hemp for industrial use (around 350,000 m3 / year).
    2019/5022
    BE2019 / 5022
    Today, the applications of hemp concrete in the building are mainly limited to filling often associated with a wooden frame or non-loadbearing elements, due to rather low mechanical strengths.
    The main qualities of hemp concrete are therefore based on their low environmental impact as well as their hygrothermal behavior limiting the building's energy needs while ensuring a good level of perceived comfort.
    Hemp concrete has qualities compared to conventional concrete that explain the development of its manufacture and its increasingly widespread use as a masonry element, in particular in the construction or renovation of non-load-bearing type walls (non-exhaustive list) :
    - External Thermal Insulation (ITE) on masonry walls or concrete support;
    - External Thermal Insulation (ITE) on post / beam system;
    - External Thermal Insulation (ITE) on a wooden frame;
    - Insulation by filling a post / beam system;
    - Insulation by filling a wooden frame system;
    - Interior Thermal Insulation (ITI) on masonry walls or concrete support;
    - Interior Thermal Insulation (ITI) on wooden frame;
    - Mixed External Thermal Insulation (ITE) on post / beam system and Insulation by filling a post / beam system;
    - Mixed Thermal Insulation by the Exterior (ITE) on a wood frame system and Insulation by filling a wood frame system.
    The shives of flax, an agricultural co-product of flax, whose production is around 1,500,000 m3 / year, are also of interest in concrete, given the performance levels that can be obtained.
    These materials from the cultivation of flax have been the subject of numerous research studies in recent years.
    Today, we know how to make non-load-bearing concrete from flax aggregates. We are talking about linen concrete.
    Linen concretes are composite building materials in which the mineral aggregates traditionally used for the manufacture of conventional concrete are at least partially replaced by flax aggregates (or flax shives).
    2019/5022
    BE2019 / 5022
    However, the manufacture of linseed concrete is largely dependent on the production of a concrete having rapid drying, low chemical reactivity with the environment, small dimensional variations as a function of hygrothermal variations.
    The production of load-bearing flax concrete is therefore complex.
    It is known in fact that the various plant particles, if they are used in their natural forms, do not exhibit good behavior with hydraulic binders, in particular with Portland cement.
    Sometimes, the presence of certain constituents of the vegetable aggregates completely prevents the hydration reaction of the cement. It is a complex phenomenon in which the different constituents of cement are subjected to different degrees to the action of the sugars, tannins, phenols and hemicelluloses contained in the vegetable raw material. Indeed, several studies have reported the inhibitory effect of these compounds on the setting of cement.
    We can cite for example the works of: MAGNIONT 2010, ESPINOZA 2009, PEYRATOUT 2007, DUPRE 2005, CEREZO 2005 and GOVIN 2004, etc.
    The manufacture of flax concrete, whether it is carrier or non-carrier, is largely subject to the production of so-called stabilized flax concrete, that is to say having, in addition to a low chemical reactivity with the environment , small dimensional variations as a function of the hygrothermal variations to which they are subjected.
    A certain number of recurrent hypotheses have been raised in the literature (FISCHER 1974, HACHEMI 1989, DUPRE 2005, CEREZO 2005, SEDAN 2007, etc.) in an attempt to explain this delay-setting phenomenon.
    In fact, the majority of studies carried out on this theme have revealed that delays in setting the cement are linked to:
    - on the one hand, to the exchanges which may occur at the matrix / lignocellulosic aggregate interface and to the hydrolysis and solubilization reactions of certain compounds such as sugars, hemicelluloses and pectins caused by the strongly alkaline medium developed by l hydration of cement; and
    - on the other hand, the decrease in the concentration of Ca2 + ions during the cement setting phase which are fixed by the plant fibers (GOVIN 2004, SEDAN 2007, MAGNIONT 2010).
    Today, although there is no real certainty on the different interactions between lignocellulosic aggregates and hydraulic matrices, it is known that the mechanical characteristics of building materials can be improved by
    2019/5022
    BE2019 / 5022 better quality of interface (interphase) between the hydraulic matrix and the fibers (FISCHER 1974, PIMIENTA et al 1994, GOVIN 2004, CEREZO 2005, SEDAN 2007, LAIDOUDI 2012, etc.).
    The fiber-matrix adhesion can be improved by modifying the topology of the surface of the plant particle.
    Thus, various treatments allow the modification of the surface of these agrosourced aggregates and consequently make it possible to create a strong bond at the fiber-matrix interface.
    Good adhesion to the interface in turn contributes to improving the transfer of charges between the fibers and the matrix and consequently to increasing the mechanical properties.
    Various treatments applied, either to the plant material or to the cement matrix, have indeed been proposed in the literature: several techniques for modifying the surface of natural fibers have been the subject of numerous citations in the bibliography (LEDHEM 2000, KHAZMA 2001, GOVIN2004, PEHANICHA 2004, LAZKO 2011, NOZAHIC 2011, LAIDOUDI 2012 and 2013, etc.).
    There are most often four classes of treatment which have been listed in the bibliography as follows:
    - physical treatments,
    - chemical treatments,
    - heat treatments and
    - mixed treatments.
    Physical treatments work in two distinct ways:
    o either by the prior swelling of the vegetable aggregate, o or by the coating of the fiber.
    In a 2001 KHAZMA publication entitled "Influence of sucrose addition on the performance of a lignocellulostic composite with a cementious matrix", a coating of the fiber is disclosed by adding sucrose in large quantities in order to improve the setting time and increase the mechanical properties thereof.
    Chemical treatments consist mainly in replacing the hydroxyl groups, which are highly hydrophilic, with hydrophobic groups (esterification).
    2019/5022
    BE2019 / 5022
    Heat treatments are mainly carried out on solid wood or wood aggregates (roasting, hydrolysis, etc.).
    Finally, mixed treatments consist, for example, of a combination of thermal and chemical treatments.
    The choice of treatment must be made by seeking the best possible improvement in the characteristics of the aggregate in terms of compatibility with the cement matrix and reduction of the hydrophilic character.
    This treatment must require a minimum of steps, be able to be carried out with the least possible energy consumption and represent a minimum economic and environmental cost.
    The Applicant submits that the various treatments proposed so far are complex and slow down the development of the linen sector in the building sector.
    Subject and summary of the present invention
    The present invention aims to improve the situation described above.
    The present invention more particularly aims to remedy the various drawbacks mentioned above by proposing a new treatment for flax shives which makes it possible to obtain a load-bearing flax concrete having particularly advantageous properties, both in terms of its thermal insulation capacities. and acoustic than its ability to transmit water vapor, than its dimensional stability vis-à-vis hygrothermal variations in its environment.
    The present invention relates according to a first aspect to a process for manufacturing a load-bearing concrete based on flax shives.
    According to the invention, the method has a phase for coating the flax shives comprising the following steps:
    o incorporation in a kneader of flax anas in an aqueous mixture comprising at least one mineral binder;
    o an inerting treatment by stirring, for example for approximately 3 to 10 minutes, flax shives and an aqueous mixture comprising at least one mineral binder for penetration of the aqueous mixture into the pores and channels
    2019/5022
    BE2019 / 5022 flax shives (for example by impregnating flax shives with the mixture), and o curing the flax shives by drying to fill the pores and solidify the flax shives in order to obtain coated flax.
    Inerting by mixing the aqueous mixture in the pores and channels of the flax shives typically allows the shives to be hydrophobic so that they are inert to chemical reactions during the setting of concrete. Here, the water dissolves the sugars contained in the shives. Its sugars then migrate to the cement matrix and prevent its hydration. Closing the pores and canals of the flax shives then makes it possible to avoid the subsequent recovery of moisture.
    As a result, the concrete produced from the coated flax shives thus obtained has excellent dimensional stability qualities with respect to hygrothermal variations.
    This proposed mineralization therefore reduces the hydrophilic nature of the flax and its water absorption capacity.
    Advantageously, the incorporation step comprises adding to the mixer at least one adjuvant product.
    Preferably, the at least one adjuvant product comprises a surfactant and / or a plasticizer.
    The incorporation of a surfactant in a cement matrix allows a better dispersion of the components, thus avoiding an agglomeration effect and therefore a heterogeneity of the material.
    The incorporation of a plasticizer in a cement matrix allows for better workability of fresh concrete. This then makes it possible to avoid gaps when filling the molds for molding the blocks.
    The plasticizer also allows less water to be used for the hydration of the cement.
    The surfactant and / or plasticizer used to obtain the coated flax shives can be any surfactant and / or plasticizer known in the concrete industry to keep the mixture a certain plasticity and its homogeneity.
    One can thus use, inter alia, surfactants based on ethoxylated fatty alcohols and / or a plasticizer based on poly-naphthalenes or poly-melamines.
    Advantageously, the surfactant and / or the plasticizer is used in dilute aqueous solution or in powder at a rate of about 0.5 to 3.5% by weight of surfactant and / or plasticizer
    2019/5022
    BE2019 / 5022 based on the weight of binder (s) used and at the rate of approximately 50 to 150 liters of water per 1 m3 of flax pineapple.
    This can vary depending on the humidity level of the latter.
    The Applicant observes that going beyond 3.5% would make setting of the concrete impossible or would make the concrete much too fluid.
    These two adjuvants can also be mixed together at a rate of approximately 0.5 to 3% by weight relative to the weight of binder (s) used.
    Advantageously, the coating phase comprises, prior to the incorporation step, an initial mixing of at least one mineral binder with water to obtain the aqueous mixture comprising the at least one mineral binder.
    Preferably, this initial brewing step is carried out very quickly for approximately 150 to 200 seconds.
    Optionally, the mineral binder comprises lime and / or cement capable of forming, after drying, a hard shell around said linseed shives.
    It is understood here that the cement used to coat the shives of flax can be any cement of known type, forming after drying a hard shell around said shives.
    Preferably, the mineral binder used comprises a CEM I type cement (or Portland cement) and / or CEM II type.
    Such a CEM I cement which contains at least 95% of clinker K and at most 5% of secondary constituents is suitable in particular for reinforced concrete or prestressed concrete (high strength and quick formwork).
    CEM II type cement (or Portland cement compound) has less clinker
    K as CEM type I cement - it contains at least 65% clinker (K) and at most 35% other secondary constituents.
    The main constituent of clinker (tricalcium silicate) sees its hydration delayed when the cement comes into contact with the sugars contained in the shives. The use of CEM II limits the number of clinker-sugar reactions, which helps to avoid delay in setting.
    The use of such a cement is thus suitable in particular for reinforced concrete in general (poured on site or prefabricated) as well as for works requiring a moderate rise in temperature or even for works requiring high initial resistances.
    Preferably, the cement is used at a rate of up to 75 kilograms for 1 m 3 of flax shives.
    2019/5022
    BE2019 / 5022 In the same way, the lime used to coat the flax shives can be any lime of known type (hydraulic lime, pre-formulated lime, specific mixture of the two) forming after drying a hard shell around the shives .
    Preferably, the lime used has a density of the order of 500 - 900 kg / m 3 .
    Preferably, lime is used at a rate of up to 75 kilograms for 1 m 3 of flax shives.
    The Applicant observes that beyond the given limit of 75 kg of binder for 1 m 3 of sheaves, the performances in compressive strength no longer guarantee the load-bearing nature of the concrete. The compromise between carrier and insulator is mainly made by the quantity of shives added to the mixture. It is found that the more sheaves, the more insulating it is, but the less the concrete is load-bearing.
    It is understood that the mineral binder can also comprise a mixture of lime and cement (in a proportion substantially equal or not) used at a rate of approximately 20 to 75 kilograms for 1 m3 of sheaf of flax.
    In a particular embodiment, the step of curing the flax shives is carried out under predetermined storage conditions for a determined period.
    Preferably, the cure period is equal to at least 7 days.
    Preferably, the storage conditions include an ambient storage temperature substantially equal to 20 ° C ± 5 ° C and / or a relative humidity of the air, or relative humidity, substantially equal to 60% ± 10%.
    Preferably, the coated flax shives are stored sheltered from the weather.
    The flax shives used are advantageously flax shives, but may also be oil flax shives.
    It will be understood here that the coated aggregates obtained after cleaning can be stored for later use, but they can also be used immediately for the manufacture of linen concrete as such.
    In this case, following the coating phase of the flax shives, the method comprises a phase of obtaining the concrete comprising:
    - a mixture of aggregates of flax shives coated with a mineral filler which may contain: sand (for example according to a particle size between 0 - 10 and / or 0 - 8), and / or gravel (for example according to a particle size between 4 - 6.3 and / or 2 - 6 and / or
    - 6 and / or 4 - 6), and / or pozzolan (for example according to a particle size between
    - 7 and / or 0 - 4 and / or 0 - 7);
    2019/5022 an addition of pre-wetting water;
    adding at least one binder and mixing water, and molding followed by drying.
    BE2019 / 5022
    In a preferred embodiment of the invention, the flax concrete is obtained by adding sand, gravel and / or pozzolan to 1 m3 of coated flax shives until a total weight of between 625 and 3,100 kg is obtained, then by adding a pre-wetting water corresponding to 3/4 of the total water of the mixture during mixing, 250 to 1450 kg of binders (lime and / or cement) and 0.5 to 3.5% in mass of plasticizing adjuvant relative to the mass of binders.
    The mixture is then mixed with the rest of the water, then molded and dried.
    In this embodiment, the linseed concrete thus obtained has a density of between 800 and 1,700 kg / m 3, good qualities of thermal insulation. It also has good qualities of sound insulation and transmission to water vapor.
    The present invention relates according to a second aspect to a load-bearing concrete based on linseed shives capable of being obtained by the manufacturing process such as that described above.
    It should be noted here that the technique of coating flax aggregates according to the invention makes it possible to considerably reduce the water absorption of flax shives from approximately 300 - 350% initially to 150 - 250%, to increase the resistances mechanical from 0.2 - 0.5 MPa to 4 - 6MPa.
    This technique also allows a reduction in the dimensional variations of the linen concrete thus obtained, which are of the order of 1.5 to 2.5 mm / m instead of 5 to 8 mm / m without coating treatment.
    Linen concrete obtained here in the context of the invention thus has, compared to conventional concretes, qualities of lightness, thermal insulation and acoustic insulation, permeability to water vapor which, combined with the advantage allow the promotion of flax by-products, explain the development of its manufacture and its use as a masonry element, in particular the construction of load-bearing walls.
    Detailed description of various examples of implementations of the invention
    The examples which follow are provided by way of simple illustration of the invention, with respect to which they are in no way limiting.
    2019/5022
    BE2019 / 5022 Example 1: Manufacture of concrete containing a flax aggregate coated with binder (whitewash and cement) and surfactant
    A) Manufacture of the coated aggregate
    In a kneader of known type, 50 kilograms of lime are introduced, 25 kilograms of cement onto which 70 liters of water are added, added with 3 kilograms of surfactant.
    It is stirred for 180 seconds and then 1 m 3 of ana of flax is added.
    The mixture is stirred for another 5 minutes and then water is added according to the humidity of the flax shives until a perfectly homogeneous mixture is obtained.
    It is left to dry for at least 7 days under specific conditions and the coated granulate obtained is stored for later use.
    B) Concrete manufacturing
    1 m3 of coated aggregate obtained in the previous step is introduced into a mixer, to which a mixture of mineral filler is added: sand of grain size 0 - 8, gravel of grain size 4 - 6.3 and pozzolan of grain size 4 - 7, until a total weight of 450 to 700 kilograms is obtained.
    A first quantity of pre-wetting water is then poured while maintaining the mixing until a homogeneous mixture is obtained.
    250 to 1450 kilograms of lime and cement are added, added with 0.5 to 3.5% by mass of plasticizer binder relative to the binder (s). The mixture is then mixed with water and then molded and dried.
    Linen concrete is obtained, the density of which is between 800 and 1,700 kg / m3.
    EXAMPLE 2 Manufacture of Concrete Containing a Flax Granulate Coated with Binder (Lime Milk and Cement) and Surfactant and Plasticizer
    A) Manufacture of the coated aggregate
    In a kneader of known type, 50 kilograms of lime are introduced, 25 kilograms of cement onto which 70 liters of water are added, supplemented with 1.5 kilograms of surfactant and 1.5 kilograms of plasticizer.
    We brew for 180 seconds then add 1 m3 of linseed shives.
    2019/5022
    BE2019 / 5022
    It is stirred for a further 5 minutes and then water is added according to the humidity of the flax shives, until a non-pasty mixture is obtained.
    It is left to dry for at least 7 days under specific conditions and the coated granulate obtained is stored for later use.
    B) Concrete manufacturing
    1 m3 of coated aggregate obtained in the previous step is introduced into a mixer, to which is added a mixture of mineral filler: sand with grain size 0 - 8, gravel with grain size 4 - 6.3 and pozzolan 4 - 7 mm , until a total weight of 450 to 700 kilograms is obtained.
    A first quantity of pre-wetting water is then poured while maintaining the mixing until a homogeneous mixture is obtained. 250 to 1450 kilograms of lime and cement are added, added with 0.5 to 3.5% by mass of plasticizer binder relative to the binder (s).
    The mixture is then mixed with water and then molded and dried.
    Linen concrete is obtained, the density of which is between 800 and 1,700 kg / m3.
    Example 3: Manufacture of concrete containing a flax aggregate coated with binder (milk of lime and cement)
    A) Manufacture of the coated aggregate
    In a kneader of known type, 50 kilograms of lime are introduced, 25 kilograms of cement onto which 70 liters of water are poured.
    We brew for 180 seconds then add 1 m3 of flax shives.
    It is stirred for a further 5 minutes and then water is added according to the humidity of the flax shives, until a perfectly homogeneous mixture is obtained.
    It is left to dry for at least 7 days under specific conditions and the coated granulate obtained is stored for later use.
    B) Concrete manufacturing
    1 m3 of coated aggregate obtained in the previous step is introduced into a mixer, to which a mixture of mineral filler is added: sand of grain size 0 - 8, gravel of grain size 4 - 6.3 and pozzolan of grain size 4 - 7 , until a total weight of 450 to 700 kilograms is obtained.
    2019/5022
    BE2019 / 5022
    A first quantity of pre-wetting water is then poured while maintaining the mixing until a perfectly homogeneous mixture is obtained. 250 to 1450 kilograms of lime and cement are added. The mixture is then mixed with water and then molded and dried.
    Linen concrete is obtained, the density of which is between 800 and 1,700 kg / m3.
    Thus, the subject of the present invention is a flax concrete which is essentially characterized in that it contains flax aggregates coated with a lime milk and / or cement optionally added with a surfactant and / or plasticizer.
    The coated flax aggregate used in the manufacture of prefabricated flax concrete for the invention is obtained by the following sequence of operations, carried out in a mixer:
    a) Brewing of the binder (s) (milk of lime and / or cement) with water added with an adjuvant product (surfactant and / or plasticizer);
    b) Addition of flax shives and brewing;
    c) Cure of coated flax shives for at least 7 days under specific conditions.
    The impregnation of the flax shives by the mixture of binder (s) and possibly of adjuvant products leads to the plugging of the pores of the flax shives, the mixture penetrating into the pores and channels of the flax before solidifying, like this. could be highlighted by microscopic observations.
    In the various examples above, the flax concretes obtained have shown good performance with regard to their dimensional stability, excellent qualities of acoustic insulation, thermal insulation, lightness, ability to transmit water vapor as well good aptitude for industrial machining, in particular sawing and cutting.
    The low density of flax concrete facilitates its implementation by technical operators.
    In addition, thanks to its interesting thermal properties, the use of this type of concrete makes it possible to reduce, or even in certain cases, to do without additional thermal insulation. This additional function compared to other products in the same fields of application thus makes it possible to generate savings in construction materials over the entire project.
    It should be observed that this detailed description relates to a particular embodiment of the present invention, but that in no case this description does not have any limiting character to the object of the invention; on the contrary, its objective is
    2019/5022
    BE2019 / 5022 to remove any possible inaccuracy or misinterpretation of the following claims.
    It should also be observed that the reference signs put in brackets in the following claims are in no way limiting; the sole purpose of these signs is to improve the intelligibility and understanding of the claims which follow, as well as the scope of the protection sought.
    权利要求:
    Claims (19)
    [1]
    BE2019 / 5022
    1. A method of manufacturing a load-bearing concrete based on linseed shives, said process having a coating phase of linseed shives comprising the following steps:
    o incorporation in a kneader of flax anas in an aqueous mixture comprising at least one mineral binder;
    an inerting treatment by mixing the flax shives and the aqueous mixture comprising at least one mineral binder for penetration of said aqueous mixture into the pores and channels of said flax shives;
    o a curing of the flax shives by drying to seal off said pores and a solidification of the flax shives in order to obtain coated flax shives.
    [2]
    2. The method of claim 1, wherein the incorporating step comprises adding to the mixer at least one adjuvant product.
    [3]
    3. Method according to claim 2, wherein said at least one adjuvant product comprises a surfactant and / or a plasticizer.
    [4]
    4. The method of claim 3, wherein said at least one adjuvant product comprises a surfactant based on ethoxylated fatty alcohols.
    [5]
    5. Method according to claim 3 or 4, wherein said at least one adjuvant product comprises a plasticizer based on poly-naphthalenes or poly-melamines.
    [6]
    6. Method according to any one of claims 3 to 5, in which the surfactant and / or the plasticizer is used in dilute aqueous solution or powder in an amount of about 0.5 to 3.5% by weight of surfactant and / or plasticizer relative to the weight of binders used and at a rate of 50 to 150 liters of water per 1 m 3 of flax shives.
    [7]
    7. Method according to any one of the preceding claims, in which the coating phase comprises, prior to the incorporation step, an initial mixing of at least one mineral binder with water to obtain said aqueous mixture comprising said at least one mineral binder.
    2019/5022
    BE2019 / 5022
    [8]
    8. The method of claim 7, wherein the initial mixing of at least one mineral binder with water is carried out for 150 to 200 seconds.
    [9]
    9. Method according to any one of the preceding claims, in which the mixing of the flax shives and of the aqueous mixture comprising the at least one mineral binder is carried out for 3 to 10 minutes.
    [10]
    10. Method according to any one of the preceding claims, in which the mineral binder comprises lime and / or cement capable of forming, after drying, a hard shell around said shives of flax.
    [11]
    11. The method of claim 10, wherein the mineral binder comprises a cement of type CEM I and / or type CEM II.
    [12]
    12. Method according to any one of the preceding claims, in which the mineral binder is used at a rate of up to 75 kilograms per 1 m 3 of flax shives.
    [13]
    13. The method of claim 11 wherein the mineral binder comprises a mixture of lime and cement used in an amount of 20 to 75 kilograms per 1 m 3 of flax shives.
    [14]
    14. Method according to any one of the preceding claims, in which the step of curing said shives is carried out under predetermined storage conditions for a determined period.
    [15]
    15. The method of claim 14, wherein the cure period is at least 7 days.
    [16]
    16. The method of claim 14 or 15, wherein the storage conditions include an ambient storage temperature equal to 20 ° C ± 5 ° C and / or a relative humidity of the air, or relative humidity, equal to 60% ± 10%.
    [17]
    17. Method according to any one of the preceding claims, in which the flax shives used are flax or oilseed shives.
    2019/5022
    17 BE2019 / 5022
    [18]
    18. Method according to any one of the preceding claims, in which, following the coating phase of the flax shives, the method comprises a phase for obtaining the load-bearing concrete comprising:
    - a mixture of aggregates of flax shives coated with a mineral filler which can
    5 contain:
    sand, and / or gravel, and / or pozzolan;
    - addition of pre-wetting water;
    10 - an addition of at least one binder and of mixing water; and
    - molding followed by drying.
    [19]
    19. Load-bearing concrete based on linseed shives capable of being obtained by a manufacturing process according to any one of claims 1 to 18.
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    CZ20662U1|2010-03-22|Chaff-containing building mixture
    BE468538A|
    同族专利:
    公开号 | 公开日
    NL2022490B1|2019-08-14|
    FR3077569A1|2019-08-09|
    BE1025979A1|2019-08-29|
    LU101093B1|2019-08-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2583743B1|1985-06-20|1993-08-13|Fresson Rene|LIGHTWEIGHT CONCRETE, BASED ON VEGETABLE AGGREGATES, RESIDUES FROM AGRICULTURAL AND FORESTRY FARMS|
    FR2772744A1|1997-12-18|1999-06-25|Michel Mouly|Wood concrete contains an aggregate of industrial wood waste coated with cement|
    FR2772745B1|1997-12-18|2000-06-09|Mouly Michel|WOOD CONCRETE CONTAINING CEMENT-COATED WOOD AGGREGATE|
    FR2939697B1|2008-12-17|2010-12-24|Univ Picardie|METHOD FOR MANUFACTURING EMULSIFIER AND METHOD FOR PRODUCING EMULSION|
    FR2958946B1|2010-04-14|2014-07-04|Ass Codem Picardie|PRODUCT AND PROCESS FOR THE MODIFICATION OF THE SURFACE OF PLANT FIBERS, TO IMPROVE THEIR USE PROPERTIES|
    法律状态:
    2019-10-14| FG| Patent granted|Effective date: 20190903 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1850921A|FR3077569A1|2018-02-05|2018-02-05|CARRIER-LIKE CONSTRUCTION MATERIAL COMPRISING COATED LINEN ANAS|
    FR1850921|2018-02-05|
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