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
  • 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
  • C04B28/06—Aluminous cements
  • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
• • 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 the general technical field of composite materials of reinforced concrete type textile (or "TRC", acronym of the English expression “Textile Reinforced Concrete”). More specifically, the present invention relates to a mineral matrix that can be combined with a technical textile to form a mineral matrix composite.
• Such a mineral matrix composite can be used in many structural applications of construction or civil engineering rehabilitation, such as water tank repair.
• Composite materials are particularly suitable for reinforcing, protecting, maintaining and repairing existing structures because of:
• Composites are already used for water tank repair. Such composites are based on the combination of an epoxy resin with a technical textile.
• WO 03/091179 discloses a dense mortar comprising an ettringite binder, siliceous sands, lime and / or Portiand Cement, powdered polymers, and additives.
• Document XP000401603 composite material including an organo-mineral binder composed in particular of Portiand cement and epoxy resin.
• WO 2013/079877 discloses a mortar comprising a binder composed mainly of Portiand cement.
• An object of the present invention is to provide a mineral matrix of substitution to the epoxy resin whose properties are compatible with the repair of drinking water tanks.
• the invention proposes a mineral matrix - for example dedicated to the rehabilitation of a structure and in particular to the repair of a water reservoir - comprising a binder, a granular skeleton, and additives, remarkable in that:
• the binder is an ettringitic binder, and in that
• the additives comprise an adhesion-reinforcing agent, said adhesion-reinforcing agent being a polyvinyl alcohol.
• the term "ettringite binder” is intended to mean a binder whose main hydrate is ettringite, unlike, in particular, binders composed mainly of Portiand cement whose main hydrate is calcium silicate hydrate (CSH). ).
• the ettringitic binder has the particularity of not releasing lime during its hydration.
• the documents XP000401603 and WO 2013/079877 do not describe a mineral matrix as defined above. Indeed, the binder described in XP000401603 is an organomineral binder composed of Portland cement and epoxy resin. Moreover, the binder described in WO 2013/079877 is mainly composed of Portland cement, so that the main hydrate formed during its hydration is hydrated calcium silicate (CSH), unlike an ettringitic binder.
• CSH calcium silicate
• the ettringitic binder according to the invention comprises:
• a first species chosen from aluminous cement (CAC) and / or sulpho-aluminous cement (CSA),
• a second species selected from calcium sulphate such as plaster and / or gypsum and / or anhydrite, and
• a third species chosen from Portland cement and / or calcium hydroxide.
• the presence, in the ettringite binder, of Portland cement and / or calcium hydroxide serves to ensure a pH of 10 to 12.5, which corresponds to the stability range of ettringite.
• WO 03/091 179 does not disclose an ettringite binder comprising Portland cement and / or calcium hydroxide.
• WO 03/091 179 dissuades the skilled person from using an ettringitic binder composed of Portland cement or calcium hydroxide (see page 5 lines 30-32 of WO 03/091 179).
• the proportions of the third species are chosen so that the hydrated matrix is devoid of Portlandite (ie lime released during the hydration of the calcium silicates of Portland cement) or of slaked lime.
• the third species may be introduced in the following proportions:
• the ettringitic binder can be composed of:
• CAC o aluminous cement
• CSA sulfo-aluminous cements
• o and calcium sulphate such as plaster and / or gypsum and / or anhydrite, and whose amount may be between 2 and 30% by weight of the total mass of the mineral matrix, o and Portland cement whose amount can be between 0 and 12% by weight of the total mass of the mineral matrix, or slaked lime whose amount can be between 0 and 3% by weight of the total mass of the mineral matrix;
• the amount of adhesive reinforcement may be between 0.1 and 1% by weight of the total mass of the mineral matrix
• the granular skeleton can be:
• metakaolin and / or
• the amount of granular skeleton can be between 40 and 90% by weight of the total mass of the mineral matrix
• the additives may comprise a setting-modifying agent chosen from:
• carboxylic acids and associated salts such as tartaric acid, potassium tartrate, and
• the quantity of setting-modifying agent can be between 0.02 and 1% by weight of the total mass of the mineral matrix
• the additives may comprise a viscosity agent chosen from cellulose ethers, guar gum, Xanthan gum, Welan gum, starch ethers and / or phyllosilicates such as hectorite;
• the amount of viscosity agent can be between 0.1 and 1% by weight of the total mass of the mineral matrix
• the additives may comprise a resin chosen from polyvalates polyvinyl acetates and / or acrylic styrene and / or styrene butadiene;
• the quantity of resin may be between 1 and 20% by weight of the total mass of the mineral matrix;
• the additives may further comprise a water-repellent of mass chosen from magnesium stearate and / or sodium oleate;
• the quantity of water repellent may be between 0 and 3% by weight of the total mass of the mineral matrix.
• mineral matrix refers to the initial composition consisting in particular of a mixture of powders
• concrete refers to the mineral matrix mixed with water
• hardened concrete refers to the concrete once it has solidified.
• the mineral matrix must meet the following objectives:
• the mineral matrix comprises a binder, a granular skeleton, and one (or more) additive (s).
• the binder allows the hardening of the mineral matrix.
• the binder of the mineral matrix is advantageously an ettringitic binder.
• ettringitic binder is intended to mean a binder whose main hydrate formed is ettringite.
• ettringite One of the properties of an ettringitic binder is that it is adapted to harden and quickly build up resistance, which differentiates it from Portland cements.
• An ettringitic binder is a mixture of aluminous cement (CAC), calcium sulphate and Portland cement.
• Aluminous cement can be replaced by sulpho-aluminous cement (CSA), calcium sulphate can be anhydrite, hemihydrate (alpha plaster or beta) or gypsum or a mixture of two of the three calcium sulphates or even three.
• CSA sulpho-aluminous cement
• calcium sulphate can be anhydrite, hemihydrate (alpha plaster or beta) or gypsum or a mixture of two of the three calcium sulphates or even three.
• the ettringitic binder is composed of:
• CAC - aluminous cement
• CSA sulpho-aluminous cement
• calcium sulphate such as plaster and / or gypsum and / or anhydrite
• the mineral matrix is intended to be applied in thin layers on a technical textile to form the composite.
• the critical period of thin layers of mineral matrix is the initial period, and especially the first 24 hours after application of it on the technical textile. During this period, there is competition between the hydration of the binder and the evaporation of the water it contains, the phenomenon of evaporation being all the more critical that the layers are thin and the exchange surface between the mineral matrix and the exterior is important.
• Portland cements are not suitable for use in a thin layer because their hardening time is too high, which leads to a high evaporation and hydration of the degraded matrix, which induces their desiccation.
• Ettringitic binders are the solution to the problem of desiccation because associated with suitable additives, it is possible to obtain very short curing times, and therefore a very rapid structuring of the mineral matrix that will oppose the evaporation of mixing water.
• the granular skeleton makes it possible to limit the cracking of the mineral matrix after drying of the latter.
• the granular skeleton is, for example, optionally milled silica, and / or calcareous filler, and / or silica fume, and / or metakaolin, and / or fly ash, and / or slag.
• the additives may comprise in particular a rheology agent, a setting modifier agent, a viscosity agent, a resin, a water-repellent mass.
• the adhesive reinforcing agent makes it possible to increase the adhesion of the matrix to the wall of the tank to be repaired.
• the reinforcing agent is advantageously a vinyl alcohol. This allows the mineral matrix to stick on the technical textile.
• the setting modifying agent is for example an accelerator or a retarding agent for accelerating or delaying the setting of the mineral matrix.
• the setting modifying agent makes it possible to manage the practical duration of use and the duration of setting of the mineral matrix.
• the setting modifier agent when it is a retarder, it may be selected from carboxylic acids and associated salts such as tartaric acid, potassium tartrate (salt) and / or sodium gluconate (sugar).
• carboxylic acids and associated salts such as tartaric acid, potassium tartrate (salt) and / or sodium gluconate (sugar).
• the setting modifier agent when the setting modifier agent is an accelerator, it may be selected from sodium carbonate, potassium sulfate, sodium sulfate, lithium sulfate, lithium salts.
• the viscosity agent makes it possible to limit the risks of sedimentation of the mineral matrix once the water has been added thereto to obtain the concrete.
• the viscosity agent is for example chosen from cellulose ether, guar gum, Xanthan gum, Welan gum, starch ether and / or hectorite.
• the resin makes it possible to increase the life of the product.
• the resin is, for example, polyvinyl versatate acetate and / or acrylic styrene and / or styrene butadiene.
• the water-repellents make it possible to reduce the capillarity of the mineral matrix once it has dried. More specifically, the water repellents make it possible to make the mineral matrix impermeable.
• the water repellents used in the composition of the mineral matrix may be chosen from magnesium stearate and / or sodium oleate.
• Viscosity agent 0.1 to 1%

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• 2014
  • 2014-04-18 FR FR1453557A patent/FR3020057A1/fr active Pending
• 2015
  • 2015-04-17 EP EP15721138.4A patent/EP3131860A1/de not_active Withdrawn
  • 2015-04-17 WO PCT/EP2015/058381 patent/WO2015158891A1/fr active Application Filing

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