Multi-component inorganic capsule anchoring system based on aluminum cement

Abstract

The present invention describes a multi-component inorganic capsule anchoring system for chemically fastening anchors and post-installed reinforcements in a mineral matrix, comprising a curable powdered aluminum cement component A and an initiator component B for initiating a curing process in an aqueous phase, wherein the powdered aluminum cement component A is an aluminum cement component based on powdered calcium aluminate cement, and wherein component B comprises an accelerator component and water. Furthermore, the invention relates to a method for chemically fastening anchoring members, preferably metal anchors and post-installation reinforcements, in a mineral matrix, such as a structure made of bricks, concrete, pervious concrete or natural stone.

Description

[0001] This invention application is a divisional application of Chinese patent application CN201980058128.4.

[0002] This patent application claims priority to European patent application EP 18199491.4, the contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a multi-component inorganic capsule anchoring system for chemically securing anchors and post-installed reinforcing bars in a mineral matrix. The system comprises a curable powdered alumina cement component A and an initiator component B in an aqueous phase for initiating the curing process. The powdered alumina cement component A is an alumina cement component based on powdered calcium aluminate cement, and component B contains an accelerator component and water. Furthermore, this invention relates to a method for chemically securing anchoring members, preferably metal anchors and post-installed reinforcing bars, in a mineral matrix, such as a structure made of brick, concrete, permeable concrete, or natural stone, using the multi-component inorganic capsule anchoring system. Background Technology

[0004] Many mortar systems exist that effectively chemically bond anchors and post-installed reinforcement to a mineral matrix or surface. Mineral systems primarily based on alumina cement have been developed. Alumina cement, with calcium aluminate as its main component, is widely used in the building and construction industry due to the high level of mechanical properties its final product exhibits over a long period. Furthermore, alumina cement is alkali-resistant, reaches its maximum strength faster than Portland cement, and is resistant to sulfate solutions. Therefore, alumina cement systems are preferred for chemical anchoring applications.

[0005] When it comes to chemically securing anchors and post-installed reinforcement into a mineral matrix, most known systems lack sufficient fluidity for most practical applications of the resulting anchoring assemblies. Furthermore, systems in liquid or slurry form must be mixed before being introduced into the wellbore, making application difficult, especially for tower top or subsea applications, as the liquid slurry may drip from the wellbore or liquefy due to surrounding water or moisture. Typically, such existing assemblies also exhibit a tendency to crack within a relatively short time, or, particularly under certain conditions (such as under the influence of high temperatures), fail to exhibit the required mechanical properties in wellbore under varying conditions and over longer periods. Moreover, known systems often exhibit significant shrinkage when applied to wellbores, leading to inadequate anchoring of the anchors and post-installed reinforcement.

[0006] Therefore, there is a need for an inorganic capsule anchoring system, preferably a multi-component inorganic capsule anchoring system, which is superior to existing systems. Specifically, it is of interest to provide a system that can be used to chemically fasten anchors and post-installed reinforcement into a mineral matrix without adversely affecting the handling characteristics and mechanical properties of the chemical anchoring system, especially for tower top and underwater applications. In particular, there is a need for a system that provides increased load-bearing capacity compared to known systems. Furthermore, there is a need to improve load-bearing capacity by adding fillers or particulate materials such as inorganic materials to reduce the consumption of more expensive adhesive materials or improve certain properties of the blended materials.

[0007] In view of the above, the object of the present invention is to provide an inorganic capsule anchoring system, preferably a multi-component inorganic capsule anchoring system, and particularly a two-component inorganic capsule anchoring system, which, compared with known systems, has superior mechanical properties over a long period of time, while also having increased load values, and is particularly advantageous in its direct application in wellbore, tower top, and underwater applications.

[0008] Furthermore, the object of the present invention is to provide a method for chemically securing anchoring components, preferably metal anchors and post-installed reinforcing bars, in a mineral matrix using this inorganic capsule anchoring system, the mineral matrix being, for example, a structure made of brick, concrete, permeable concrete or natural stone.

[0009] These and other objects that become apparent after the description of the invention are achieved by the invention as set forth in the independent claims. The dependent claims relate to preferred embodiments. Summary of the Invention

[0010] In one aspect, the present invention relates to a multi-component inorganic capsule anchoring system comprising a curable powdered alumina cement component A and an initiator component B in an aqueous phase for initiating a curing process, wherein the powdered alumina cement component A is an alumina cement component based on powdered calcium aluminate cement, and wherein component B comprises an accelerator component and water. This provided capsule-form system is used to chemically fasten anchoring members within a mineral matrix.

[0011] In another aspect, the present invention relates to a method for chemically fastening anchors and post-installed reinforcing bars in a mineral matrix, characterized by the use of a multi-component inorganic capsule anchoring system comprising a curable powdered aluminum cement component A and an initiator component B for initiating the curing process, wherein the powdered aluminum cement component A is an aluminum cement component based on powdered calcium aluminate cement, and wherein component B contains an accelerator component and water. The mineral matrix is ​​a matrix of structures such as brickwork, concrete, permeable concrete, or natural stone. Detailed Implementation

[0012] In the context of this invention, the following terms and definitions will be used: As used in the context of this invention, unless the context clearly indicates otherwise, the singular form “a / an” also includes the corresponding plural form. Thus, unless otherwise indicated, the term “a / an” is intended to mean “one or more” or “at least one”.

[0013] In the context of this invention, the term "aluminate cement" refers to calcium aluminate cement primarily composed of hydraulically active calcium aluminate. Alternative names include "high-alumina cement" or the French term "ciment fondu." The main active component of calcium aluminate cement is monocalcium aluminate (CaAl2O4, CaO·Al2O3, or CA in the chemical symbol for cement).

[0014] In the context of this invention, the term "initiator" or "initiator component" refers to a compound or composition that alters the chemical environment to initiate a specific chemical reaction. In this invention, the initiator initiates the curing process in the final mixture.

[0015] In the context of this invention, the term "accelerator component" refers to a compound or mixture of compounds that accelerates the solidification of the final mixture to achieve a faster solidification time.

[0016] The inventors have unexpectedly discovered that the inorganic capsule anchoring system according to the invention is an easy-to-handle, ready-to-use system for chemically securing anchors and post-installed reinforcing bars in a mineral matrix, particularly for long-term applications and applications at tower tops. The inorganic capsule anchoring system comprises a curable powdered alumina cement component based on calcium aluminate cement and initiator component B. Furthermore, this inorganic capsule anchoring system is particularly suitable for underwater applications, such as installation on oil drilling rigs.

[0017] Furthermore, it has been found that the multi-component inorganic capsule anchoring system of the present invention, particularly the two-component inorganic capsule anchoring system, allows for easy application and fastening directly within the wellbore without the need for premixing the components before introducing them into the wellbore. When applied, for example, underwater, the components of the inserted capsule are mixed by introducing the anchoring rod into the wellbore, the water surrounding the capsule is expelled, and the anchoring rod is secured.

[0018] Therefore, the present invention relates to a multi-component inorganic capsule anchoring system comprising a curable powdered aluminum cement component A and an initiator component B in an aqueous phase for initiating a curing process, wherein the powdered aluminum cement component A is an aluminum cement component based on powdered calcium aluminate cement, and wherein component B comprises an accelerator component and water.

[0019] Component A used in this invention is based on alumina cement (CA) or calcium sulfoaluminate cement (CAS). The alumina cement component used in this invention is preferably based on powdered calcium aluminate cement (CAC). The alumina cement used in this invention is characterized by rapid setting and hardening, rapid drying, and excellent corrosion resistance and shrinkage. Suitable calcium aluminate cements for use in this invention are, for example, Ternal® White (Kerneos, France).

[0020] If component A contains a mixture of alumina cement (CAC) and calcium sulfate (CaSO4), ettringite will rapidly form during hydration. In concrete chemistry, hexacalcium trialuminate hydrate, represented by the general formula (CaO)6(Al2O3)(SO3)3·32H2O or (CaO)3(Al2O3)(CaSO4)3·32H2O, is formed by the reaction of calcium aluminate with calcium sulfate, leading to rapid setting and hardening, as well as shrinkage compensation or even expansion. Shrinkage compensation can be achieved with a moderate increase in sulfate content.

[0021] Based on the total weight of component A, component A used in the present invention comprises at least about 20% by weight, preferably at least about 40% by weight, more preferably at least about 60% by weight, most preferably at least about 70% by weight, about 20% to about 100% by weight, preferably about 40% to about 85% by weight, more preferably about 60% to about 80% by weight, and most preferably about 70% to about 80% by weight of aluminum cement.

[0022] According to an alternative embodiment of the invention, component A comprises at least about 20% by weight, preferably at least about 30% by weight, more preferably at least about 40% by weight, most preferably at least about 50% by weight, about 20% to about 80% by weight, preferably about 30% to about 70% by weight, more preferably about 35% to about 60% by weight, most preferably about 40% to about 55% by weight, and at least about 5% by weight, preferably at least about 10% by weight, more preferably at least about 15% by weight, most preferably at least about 20% by weight, about 1% to about 50% by weight, preferably about 5% to about 40% by weight, more preferably about 10% to about 30% by weight, most preferably about 15% to about 25% by weight, calcium sulfate, preferably hemihydrated calcium sulfate, by weight. In a preferred alternative embodiment of the multi-component inorganic capsule anchoring system of the invention, the CaSO4 / CAC ratio of component A should be less than or equal to 35:65.

[0023] Component A may additionally contain mineral fillers. According to the invention, the mineral fillers contained in component A are selected from the group consisting of: limestone fillers, sand, crushed stone, gravel, pebbles, and mixtures thereof, preferably limestone fillers, coarse quartz, quartz powder (preferably quartz powder with an average particle size (d50%) of about 16 μm), quartz sand, clay, fly ash, fumed silica, carbonate compounds (such as various calcium carbonates), alumina, pigments, titanium dioxide, lightweight fillers, corundum, and mixtures thereof. Suitable mineral fillers are commercially available products. Exemplary examples include quartz powder Millisil W12 or W6 (Quarzwerke GmbH, Germany), quartz sand F32 (Quarzwerke GmbH, Germany), or Sewper Aggregates such as SewperCoat® (Kerneos SA, France). The mineral filler of component A is most preferably calcium carbonate or a mixture of calcium carbonate. Based on the total weight of component A, component A comprises at least about 20% by weight, preferably at least about 30% by weight, more preferably at least about 40% by weight, even more preferably at least about 50% by weight, most preferably at least about 60% by weight, about 20% to about 95% by weight, preferably about 30% to about 90% by weight, more preferably about 40% to about 85% by weight, even more preferably about 45% to about 80% by weight, and most preferably about 50% to about 75% by weight of mineral filler. The mineral filler is selected to obtain a particle size complementary to that of the alumina cement. Preferably, the average particle size of the filler is 500 μm or less, more preferably 400 μm or less, and most preferably 350 μm or less.

[0024] The mineral filler that can be used according to the present invention is contained in the powdered aluminum cement component A of the multi-component inorganic capsule anchoring system. When the multi-component inorganic capsule anchoring system is in the form of a two-component inorganic capsule anchoring system, the addition of mineral filler reduces the consumption of more expensive binder materials and improves some properties of the mixture, resulting in increased load values ​​and easy use in tower top and underwater applications.

[0025] In an advantageous embodiment, component A used in this invention may further comprise the following features, either individually or in combination.

[0026] Component A may further comprise an antimicrobial agent or biocide in powder form. The antimicrobial agent or biocide that can be used in this invention may be selected from the group consisting of compounds of the isothiazolinone family, such as methylisothiazolinone (MIT), octylisothiazolinone (OIT), and benzisothiazolinone (BIT), and mixtures thereof.

[0027] Component A may additionally contain a thickener in powder form. Thickeners used in this invention may be selected from the group consisting of: organic products such as xanthan gum, welan gum, or DIUTAN® gum (CPKelko, USA), starch-derived ethers, guar bean-derived ethers, cellulose-derived ethers, polyacrylamide, carrageenan, agar paste; and mineral products such as clay, as well as mixtures of organic and mineral products. Suitable thickeners are commercially available products. Component A contains at least about 0.01% by weight, preferably at least about 0.1% by weight, more preferably at least about 0.2% by weight, most preferably at least about 0.3% by weight, from about 0.01% by weight to about 10% by weight, preferably from about 0.1% by weight to about 5% by weight, more preferably from about 0.2% by weight to about 1% by weight, and most preferably from about 0.3% by weight to about 0.7% by weight of the thickener, based on the total weight of component A.

[0028] Component A may also contain a plasticizer in powder form. The plasticizer included in Component A may be selected from the following groups: low molecular weight (LMW) polyacrylic acid polymers; condensation polymers, such as sulfonated melamine formaldehyde, lignin sulfonate, casein; superplasticizers from the families of polyethylene oxide polyphosphonates and polyethylene oxide polycarbonates, and superplasticizers from the families of polycarboxylate ethers, and mixtures thereof, such as Ethacryl™ G (Coatex, Arkema Group, France), Acumer™ 1051 (Rohm and Haas, UK), Sika® ViscoCrete®-2520 (Sika, Germany), or Sika® ViscoCrete®-20 HE (Sika, Germany). Suitable plasticizers are commercially available products. Based on the total weight of component A, component A may contain at least about 0.2% by weight, preferably at least about 0.3% by weight, more preferably at least about 0.4% by weight, most preferably at least about 0.5% by weight, about 0.2% to about 20% by weight, preferably about 0.3% to about 15% by weight, more preferably about 0.4% to about 10% by weight, and most preferably about 0.5% to about 8% by weight of the plasticizer.

[0029] Similarly, component A may contain a dispersant in powder form.

[0030] The presence of mineral fillers, antibacterial agents or biocides, plasticizers, thickeners and / or dispersants in powder form does not alter the overall inorganic properties of cementitious component A.

[0031] Component B used in this invention contains an accelerator component and water.

[0032] The accelerator component comprises at least one alkali metal and / or alkaline earth metal salt selected from the group consisting of: hydroxides, chlorides, sulfates, phosphates, monohydrogen phosphates, dihydrogen phosphates, nitrates, carbonates, and mixtures thereof. Preferably, the accelerator component is an alkali metal or alkaline earth metal salt, more preferably a water-soluble alkali metal or alkaline earth metal salt, and more preferably a calcium metal salt, such as calcium hydroxide, calcium sulfate, calcium carbonate, calcium chloride, calcium formate, or calcium phosphate; a sodium metal salt, such as sodium hydroxide, sodium sulfate, sodium carbonate, sodium chloride, sodium formate, or sodium phosphate; or a lithium metal salt, such as lithium hydroxide, lithium sulfate, lithium sulfate monohydrate, lithium carbonate, lithium chloride, lithium formate, lithium citrate, or lithium phosphate, most preferably lithium sulfate or lithium sulfate monohydrate, or mixtures thereof. Based on the total weight of component B, component B contains at least about 0.01% by weight, preferably at least about 0.05% by weight, more preferably at least about 0.1% by weight, most preferably at least about 1.0% by weight, about 0.01% by weight to about 30% by weight, preferably about 0.05% by weight to about 20% by weight, more preferably about 0.1% by weight to about 15% by weight, and most preferably about 1.0% by weight to about 13% by weight of the accelerator.

[0033] Component B may further include a retarder, plasticizer, and / or a carbonate source such as lithium carbonate in liquid form.

[0034] The retarder included in component B of the present invention is selected from the group consisting of citric acid, tartaric acid, lactic acid, salicylic acid, gluconic acid, and mixtures thereof, preferably a mixture of citric acid and tartaric acid. Based on the total weight of component B, component B contains at least about 0.1% by weight, preferably at least about 0.2% by weight, more preferably at least about 0.5% by weight, most preferably at least about 1.0% by weight, from about 0.1% by weight to about 25% by weight, preferably from about 0.2% by weight to about 15% by weight, more preferably from about 0.5% by weight to about 15% by weight, and most preferably from about 1.0% by weight to about 10% by weight of the retarder.

[0035] The plasticizer included in component B of this invention is selected from the group consisting of: low molecular weight (LMW) polyacrylic acid polymers; condensation polymers, such as sulfonated melamine formaldehyde, lignin sulfonate, casein; superplasticizers from the families of polyethylene oxide polyphosphonates and polyethylene oxide polycarbonates, and superplasticizers from the families of polycarboxylate ethers, and mixtures thereof, such as Ethacryl™ G (Arkema Group, France), Acumer™ 1051 (Rohm and Haas, UK), Sika ® ViscoCrete ® -2520 (Sika, Germany) or Sika ® ViscoCrete ®-20 HE (Sika, Germany). Suitable plasticizers are commercially available products. Component A contains at least about 0.2% by weight, preferably at least about 0.3% by weight, more preferably at least about 0.4% by weight, most preferably at least about 0.5% by weight, about 0.2% to about 20% by weight, preferably about 0.3% to about 15% by weight, more preferably about 0.4% to about 10% by weight, and most preferably about 0.5% to about 8% by weight of the plasticizer, based on the total weight of component B.

[0036] Component B may additionally include a thickener. The thickener used in this invention may be selected from the group consisting of: bentonite, silica, quartz, acrylate-based thickeners such as alkali-soluble or alkali-swellable emulsions, fumed silica, clay, and titanate chelating agents. Exemplary examples include polyvinyl alcohol (PVA), hydrophobically modified alkali-soluble emulsions (HASE), hydrophobically modified ethylene oxide urethane polymers known in the art as HEUR, and cellulose thickeners such as hydroxymethyl cellulose (HMC), hydroxyethyl cellulose (HEC), hydrophobically modified hydroxyethyl cellulose (HMHEC), sodium carboxymethyl cellulose (SCMC), sodium carboxymethyl 2-hydroxyethyl cellulose, 2-hydroxypropyl methylcellulose, 2-hydroxyethyl methylcellulose, 2-hydroxybutyl methylcellulose, 2-hydroxyethyl ethyl cellulose, 2-hydroxypropyl cellulose; attapulgite clay, and mixtures thereof. Suitable thickeners are commercially available products such as Optigel WX (BYK-Chemie GmbH, Germany), Rheolate 1 (Elementis GmbH, Germany), and Acrysol ASE-60 (The Dow Chemical Company). Component B comprises, by weight of total component B, at least about 0.01 wt%, preferably at least about 0.05 wt%, more preferably at least about 0.1 wt%, most preferably at least about 0.2 wt%, from about 0.01 wt% to about 15 wt%, preferably from about 0.05 wt% to about 10 wt%, more preferably from about 0.1 wt% to about 5 wt%, and most preferably from about 0.2 wt% to about 1 wt% of the thickener.

[0037] The presence of retarders, plasticizers, thickeners and / or carbonate sources in liquid form does not alter the overall inorganic properties of component B.

[0038] Component B exists in the aqueous phase, preferably in liquid form. In alternative embodiments, component B may also exist in the form of a slurry or paste.

[0039] The weight ratio of component A to component B (A / B) is preferably between 7 / 1 and 1 / 3, and more preferably 3 / 1. Preferably, the mixture composition comprises 75% by weight of component A and 25% by weight of component B. In an alternative embodiment, the mixture composition comprises 25% by weight of component A and 75% by weight of component B.

[0040] In a particular preferred embodiment, component A comprises or is composed of the following components: 50% to 100% by weight of calcium aluminate cement Optional 10% to 50% by weight of mineral filler, such as calcium carbonate.

[0041] In a particular preferred embodiment, component B comprises or is composed of the following components: Lithium sulfate from 0.1% to 20% by weight, 1% to 10% by weight of plasticizer, and 70% to 99% water by weight.

[0042] Preferably, the initial solidification time of the multi-component inorganic capsule anchoring system is at least 5 minutes, preferably at least 10 minutes, more preferably at least 15 minutes, and most preferably at least 20 minutes. After mixing the two components A and B, the solidification time is particularly in the range of about 5 minutes to 25 minutes, preferably in the range of about 10 to 20 minutes.

[0043] In multi-component inorganic capsule anchoring systems, particularly in two-component inorganic capsule anchoring systems, the volume ratio of cementitious component A to component B is 1:1 to 7:1, preferably 3:1. In alternative embodiments, the volume ratio of cementitious component A to component B is 1:3 to 1:2.

[0044] The multi-component inorganic capsule anchoring system is preferably a ready-to-use system, wherein components A and B are in a multi-chamber device, such as a multi-chamber cylinder, multi-chamber tube, and / or multi-chamber capsule, preferably a two-component capsule. Specifically, the two-component inorganic capsule anchoring system comprises two foil pouches for separating the curable component A and the initiator component B. In alternative embodiments, the two-component inorganic capsule is made of glass or paper. The two-component inorganic capsule may also be referred to as a dual capsule, dual foil, or dual glass. The contents of the capsule are mixed together by inserting the inorganic anchoring system into the wellbore, thereby introducing the anchoring device and directly breaking the capsule and mixing components A and B within the wellbore to prepare for setting and chemically securing the anchoring member.

[0045] Specifically, the multi-component inorganic capsule anchoring system is considered a chemical anchor for securing metallic anchors and post-installed reinforcement (e.g., anchor rods, particularly threaded rods, bolts, steel reinforcing bars, etc.) into a mineral matrix (such as structures made of brick, concrete, permeable concrete, or natural stone). More specifically, the multi-component inorganic capsule anchoring system can be used to chemically secure anchoring components (such as metallic anchors and post-installed reinforcement) into a mineral matrix (such as structures made of brick, concrete, permeable concrete, or natural stone). Preferably, the multi-component inorganic capsule anchoring system is used to secure anchor rods in a wellbore.

[0046] Furthermore, multi-component inorganic capsule anchoring systems can be used to connect fibers, loose fabrics, textiles, or composites (especially high-modulus fibers, preferably carbon fibers), particularly for reinforcing building structures (e.g., walls, ceilings, or floors), or further for mounting components such as plates or blocks (e.g., made of stone, glass, or plastic) onto building or structural elements. However, more precisely, they are used to secure anchoring members, preferably metal anchors, and post-installed reinforcement (e.g., anchor rods, especially threaded rods, bolts, steel reinforcing bars, etc.) into recesses (e.g., wells) in a mineral matrix (e.g., structures made of brick, concrete, permeable concrete, or natural stone), thereby mixing the components of the multi-component inorganic capsule anchoring system, for example, by breaking the capsule or plastic / film bag.

[0047] The multi-component inorganic capsule anchoring system of the present invention is preferably contained separately in a two-chamber capsule to inhibit the reaction, but can be allowed to react under operating conditions. Furthermore, component A and component B are produced separately from each other; therefore, one component typically contains curable powdered aluminum cement, while the other component contains initiator component B, which includes accelerator components and water. The filler and other components may be contained in one or more of the other components.

[0048] Two-chamber and multi-chamber systems of the multi-component inorganic capsule anchoring system of the present invention particularly comprise a cylinder of glass, plastic, plastic sheet, or ceramic, in which the curable component is kept separate from the initiator component by walls that can be broken. Such cylinder or capsule systems are placed in a wellbore. To initiate a curing reaction, the cylinder or capsule is broken, for example, by driving an anchoring member (such as a connecting rod) into the cylinder or capsule, which includes the separators contained therein.

[0049] The following examples illustrate the invention, but are not intended to limit the invention.

[0050] Example 1. Comparison of inorganic capsule anchoring systems Only known single-component capsule systems exist, which must be immersed in water to prepare for chemical fastening using their contents. These single-component capsule systems are unsuitable for top-of-the-line and underwater applications due to their difficulty in handling and dispensing. Examples of these single-component systems include Cemeforce (Sumitomo Osaka Cement Co., Ltd., Japan) or the Ambex system from Ambex Concrete Repair Solutions, Canada.

[0051] Preparation of the Inorganic Capsule Anchoring System of the Present Invention The powdered cementitious component A and the liquid initiator component B of Examples 1 and 2 of the present invention were first produced by mixing the components specified in Tables 1 and 2, respectively. The proportions given are expressed in weight percent.

[0052] Table 1: Composition of Powder Component A Ternal White® is commercially available from the French company, Kenos. Omyacarb 130 AL is commercially available from Omya International AG, Switzerland. The typical mixing scheme for component B is as follows: Lithium sulfate monohydrate is dissolved in deionized water on a stirring plate and thoroughly homogenized at 500 rpm; finally, the plasticizer is added while stirring, and homogenization is continued at 500 rpm for 5 minutes.

[0053] Table 2: Composition of Liquid Component B Lithium sulfate monohydrate is commercially available from Alfa Aesar GmbH & Co. KG, Germany. The Visco Crete 2520 is commercially available from Sika Deutschland in Germany. 2. Determination of mechanical properties After being produced separately, powdered cementitious component A and initiator component B were mixed in a high-speed mixer. All samples were mixed at a constant w / c ratio of 0.3. The mixture was cast into a stainless steel sleeve wellbore with a diameter of 12 mm, an anchoring depth of 32 mm, and an undercut of 0.33 mm. Immediately after filling, a 100 mm long M8 threaded anchor rod was introduced into the wellbore. The load values ​​of the cured mortar composition were determined 24 hours after curing using an apparatus for testing material “Zwick Roell Z050” (Zwick GmbH, Ulm, Germany). The stainless steel sleeve was fastened to a plate, while the threaded anchor rod was fixed to the force measuring device with a nut. The failure load was determined by pulling the threaded anchor rod from the center at a preload of 500 N and a test rate of 3 mm / min. Each sample consisted of the average of five pulls. The final failure load was calculated as internal strength and is expressed in N / mm² in Table 3. 2 Provided.

[0054] Table 3: Internal Strength, in N / mm 2 As can be seen from Table 3, the system of the present invention exhibits considerable internal strength after curing for 24 hours.

[0055] Multi-component inorganic capsule anchoring systems exhibit excellent mechanical properties over long periods of time, along with high load values, and are particularly advantageous for direct applications in wellbores, tower tops, and underwater.

Claims

1. A multi-component inorganic capsule anchoring system for chemically securing anchors and post-installed reinforcements in a mineral matrix for wellbore, subsea, or tower applications, comprising a curable powdered alumina cement component A and an initiator component B in an aqueous phase for initiating a curing process, wherein the powdered alumina cement component A is an alumina cement component based on powdered calcium aluminate cement, and wherein component B contains an accelerator component and water, components A and B being contained in a multi-chamber capsule, the contents of the capsule being mixed together by directly breaking the capsule and mixing components A and B within the wellbore, subsea, or tower application, by inserting the inorganic anchoring system into the wellbore, subsea, or tower application, introducing the anchors or post-installed reinforcements.

2. The multi-component inorganic capsule anchoring system according to claim 1, wherein component A comprises another mineral filler.

3. The multi-component inorganic capsule anchoring system according to claim 1 or 2, wherein the accelerator component contained in component B is present in the range of about 0.01% by weight to 30% by weight, based on the total weight of component B.

4. The multi-component inorganic capsule anchoring system according to any one of the preceding claims, wherein the initiator component B further comprises a plasticizer.

5. The multi-component inorganic capsule anchoring system according to any one of the preceding claims, wherein component B further comprises a carbonate source in liquid form.

6. The multi-component inorganic capsule anchoring system according to any one of the preceding claims, characterized in that... The multi-component inorganic capsule anchoring system is a two-component inorganic capsule anchoring system.

7. The multi-component inorganic capsule anchoring system according to claim 6, wherein the two-component inorganic capsule anchoring system is in the form of a film bag or a glass capsule.

8. Use of a multi-component inorganic capsule anchoring system as described in any one of claims 1 to 7, for chemically securing anchoring components in a mineral matrix.

9. A method for chemically fastening anchors and post-installed reinforcing bars in a mineral matrix, characterized in that... The fastening is performed using the multi-component inorganic capsule anchoring system as described in any one of claims 1 to 7.

10. The method of claim 9, wherein the multi-component inorganic capsule anchoring system used for fastening is a two-component inorganic capsule anchoring system.

11. The method of claim 10, wherein the bicomponent inorganic capsule anchoring system is in the form of a film bag or a glass capsule.

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