Two-component mortar and its use

Description

[0001] The invention relates to a two-component mortar composition comprising a resin component (A) comprising at least one radically curable resin, and a hardener component (B) for the resin of the resin component (A). The invention further relates to the use of the mortar composition for the chemical fastening of components such as anchor threaded rods, reinforcing bars, threaded sleeves, and screws in boreholes inserted into a mineral substrate.

[0002] To securely fasten components such as anchor threaded rods, reinforcing iron, threaded sleeves, and screws in a mineral substrate such as concrete, natural stone, or plaster, drill holes of the appropriate dimensions are first drilled into the mineral substrate to accommodate the components to be fastened. The drill holes are then cleaned of drilling dust, and the two-component mortar is mixed with the hardener component and introduced into the drill hole. The component to be fastened is then inserted into the drill hole filled with the mortar and adjusted. Once the mortar has hardened, the resin component reacts with the hardener component to firmly hold the component in the mineral substrate.

[0003] The load-bearing behavior of the components fastened in this way depends on several influencing factors, which are usually classified as internal and external. Internal influencing factors include the chemical composition of the mortar mix, its manufacturing process, and the packaging of the mortar mix, which typically comprises components in two separate containers.

[0004] External factors include the type of borehole cleaning, the quality of the mineral subsoil, such as concrete, its humidity and temperature, and the type of borehole construction.

[0005] EP 0 432 087 and EP 0 589 831 disclose two-component mortar compositions based on urethane (meth)acrylate resins which cure by radical polymerisation.

[0006] The document EP 3 299 350 discloses a two-component mortar composition with a resin component (A) which contains at least one radically curable resin as a curable component, and a hardener component (B) which contains a curing agent for the radically curable resin of the resin component (A), wherein the resin component (A) and / or the hardener component (B) contains at least one inorganic additive as a further component, characterized in that the inorganic additive comprises a transition aluminum oxide with an average particle size d50 of at least 7.0 µm and a pore diameter of 4 nm to 30 nm.

[0007] The mortar compounds based on radically curing reactive resins known in the state of the art and used as chemical bond anchors already exhibit good load-bearing capacity under certain curing conditions. However, the curing conditions encountered on a construction site, for example, can vary widely, for example with regard to temperature and / or humidity, and cannot be arbitrarily influenced in practice.

[0008] However, it is known that temperature or humidity can affect the performance of chemical anchoring mortars. For example, the curing temperature is known to influence the strength of the resulting joint. It is also known that the presence of water or even moisture during the installation of a chemical anchor can affect the performance of an adhesive anchor system, either mechanically, chemically, or even both. Site conditions where the concrete substrate is wet are common and sometimes unexpected. Likewise, the temperature prevailing on a construction site can vary widely.

[0009] Therefore, there is a need for chemical mortars that can be used over a wide temperature range and / or that are less sensitive to the presence of water. It is therefore an object of the present invention to provide chemical mortars that are easy to process and that exhibit good or improved mechanical properties under dry and wet conditions over a wide temperature range.

[0010] It has surprisingly been found that this object is achieved by a two-component mortar composition according to claim 1.

[0011] Preferred embodiments of the mortar composition according to the invention are specified in the subclaims, which can optionally be combined with one another.

[0012] The invention further relates to the use of the mass for the chemical fastening of components such as anchor threaded rods, reinforcing bars, threaded sleeves and screws in boreholes which are present in a mineral substrate, preferably concrete.

[0013] In its general form, the invention comprises a two-component mortar composition with a resin component (A) which contains at least one radically curable resin as a curable component, and a hardener component (B) which contains a curing agent for the radically curable resin of the resin component (A), wherein the resin component (A) and / or the hardener component (B) contains at least CaO as a further component, characterized in that the CaO has a reactivity t 60 analogous to DIN EN 459-2 of more than 2 min.

[0014] The fastening of structural components using the two-component mortar composition according to the invention results in high load values ​​over a wide temperature range in both dry and / or moist boreholes. This is achieved according to the invention by adding a specific type of CaO, i.e., CaO must have a reactivity t 60 of more than 2 min.

[0015] Limes are classified according to their reactivity as soft-fired, medium-fired, and hard-fired. Fast-reacting lime with a reaction time of up to 2 minutes is generally referred to as soft-fired, while limes with slower slaking reactions are referred to as medium-fired (up to approx. 6 minutes) or hard-fired (> 6 minutes). The reactivity of lime (CaO) depends on the firing temperature used during production. In general, reactivity decreases with higher firing temperatures. The differences are a result of the crystallite size of the CaO, pore volume, and specific surface area, which are influenced by the firing temperature and duration (these firing parameters are collectively referred to as the firing degree). Soft-fired lime is formed at temperatures of 900 to 1000°C, while hard-fired lime is formed at up to 1400°C, whereby the duration of the temperature exposure and, above all, the petrographic formation of the limestone also play a role.

[0016] The reactivity of fine lime during slaking is determined by measuring the temperature increase that occurs when it reacts with water as a function of the reaction time. This method is called the wet slaking curve (NLK). This measurement method is based on DIN EN 459-2. For the reaction process, 150 + / - 0.5 g of unslaked lime are placed in a Dewar flask containing 600 + / - 1 g of distilled water at approximately 20°C. Since the contents of the Dewar flask must be thoroughly mixed throughout the test, the mixture is stirred with a stirrer (speed 350 + / - 1 / min). During the slaking reaction, the released heat energy heats the water. The temperature increase is recorded by a high-quality temperature sensor and transmitted to software for evaluation.The usual evaluation according to DIN EN 459-2 is based exclusively on data from two measurement points (100% and 80% conversion), although the entire reaction is recorded. In application laboratories, this evaluation is often even reduced to a single value. In these cases, only the time required to reach 60°C (t 60 [min]) is considered. The latter method is also used in the present invention to define the reactivity of CaO.

[0017] The term "Reactivity t 60 " Therefore, according to the invention, refers to a reactivity of the CaO used, which is measured by determining the wet quenching curve according to DIN EN 459-2, with the modification that the time period (in minutes) until 60°C is reached is considered here.

[0018] It has been shown that the bond stresses obtained under humid borehole conditions can be improved by adding CaO to the mortar mass. However, this can deteriorate the bond stresses obtained at low temperatures. However, it has been found according to the invention that when using a certain type of CaO, the bond stress is improved under humid conditions and equally good to improved bond stresses are obtained at low temperatures. In particular, it was found that the CaO used in the mortar mass must have a reactivity t 60 of more than 2 min in order to simultaneously obtain good to improved bond stresses under both humid conditions and at low temperatures.

[0019] Further advantages of the invention will become apparent from the following description of preferred embodiments.

[0020] Under a " Two-component mortar compound"For the purposes of the invention, a mortar composition is understood to consist of a curable resin component and a hardener component for the resin component. The resin component and the hardener component are stored separately from one another so that no reaction between the hardener component and the resin component occurs during storage. The curing of the reactive resin is initiated by mixing the hardener component with the reactive resin immediately before application of the mortar composition.

[0021] The term "inorganic additive" refers to all inorganic components of the mortar mass, except water and CaO.

[0022] The two-component mortar composition of the present invention is characterized by containing CaO having a reactivity t 60 analogous to DIN EN 459-2 of more than 2 min. In a preferred embodiment, the reactivity t 60 of the CaO used is at least 3 min, more preferably at least 4 min. For example, the CaO used can have a reactivity t 60 of at least 5 min, such as at least 8 min.

[0023] The amount of CaO present in the mortar composition according to the invention is not particularly limited. Even small amounts of CaO exhibit an improving effect. In principle, the entire amount of inorganic additives commonly found in mortar compositions can be replaced by CaO according to the invention. In one embodiment, the CaO content is from 2 to 30 percent by weight, based on the total weight of the composition. In another embodiment, the CaO content is preferably from 5 to 25 percent by weight, more preferably from 10 to 20 percent by weight, based on the total weight of the composition.

[0024] The CaO with a reactivity t 60 of more than 2 min can be present in the two-component mortar composition according to the invention in the resin component (A), the hardener component (B), or both in the resin component (A) and the hardener component (B). In one embodiment, the CaO is present in the resin component (A).

[0025] The mortar composition according to the present invention typically comprises at least one inorganic additive as a further constituent in the resin component (A) and / or the hardener component (B). The use of inorganic additives in mortar compositions is known in the art. In principle, CaO is also an inorganic substance, but according to the nomenclature used here, as an essential component of the mortar composition according to the invention, it is not referred to as an inorganic additive. The total amount of inorganic substances in the mortar composition according to the invention is therefore determined from the amount of CaO plus the amount of inorganic additive.

[0026] The mortar composition according to the invention can contain high amounts of inorganic additives. For example, the amount of inorganic additive is in a range from 15% to 80% by weight, based on the total weight of the mortar composition. Typically, amounts of inorganic additive at the upper end of this range are used when the amount of CaO in the mortar composition is small, and amounts of inorganic additive at the lower end of this range are used when the amount of CaO in the mortar composition is large. In one embodiment, the amount of inorganic additives is 20 to 70% by weight, based on the total weight of the mortar composition. The total amount of CaO plus inorganic additives according to the invention is preferably at least 60% by weight, more preferably at least 65% by weight, such as at least 70% by weight.However, total amounts of CaO plus inorganic additives of more than 85 percent by weight should be avoided according to the invention, since otherwise the workability of the mortar masses may be impaired, since homogeneous mixing is made difficult due to the high viscosity of the highly filled masses.

[0027] The inorganic additives may be selected, for example, from inorganic fillers, hydraulically setting or polycondensable inorganic compounds, modifiers and mixtures thereof.

[0028] The inorganic additive preferably comprises a filler, which may be present in the resin component (A) and / or in the hardener component (B). Examples of suitable fillers are BaSO4, quartz, glass, corundum, porcelain, earthenware, barite, light spar, gypsum, talc, fly ash, and / or chalk, as well as mixtures thereof, for example in the form of sands, flours, or molded bodies, preferably in the form of fibers or spheres.

[0029] According to a further preferred embodiment of the invention, the inorganic additive further comprises a hydraulically setting or polycondensable inorganic compound, such as cement and / or gypsum, preferably iron oxide-free or low-iron oxide cement, such as aluminate cement. The hydraulically setting or polycondensable inorganic compound is preferably contained in the hardener component (A). In this case, the hardener component (B) comprises, in addition to the hardener and the water optionally included for phlegmatizing the hardener, additional water for curing the hydraulically setting or polycondensable inorganic compound.

[0030] Finally, the inorganic additive in the resin component (A) and / or in the hardener component (B) may contain further inorganic modifiers such as thickeners, plasticizers and thixotropic agents, for example precipitated or pyrogenic silica, bentonite and / or kaolin.

[0031] The two-component mortar composition of the present invention further comprises, as a curable component in the resin component (A), at least one radically curable resin. Radically curable resins for use in mortar compositions are known in the art. Radically curable resins suitable according to the invention include, for example, ethylenically unsaturated compounds, compounds with carbon-carbon triple bonds, and thiol-yne / ene resins, as known to those skilled in the art.

[0032] Of these compounds, the group of ethylenically unsaturated compounds is preferred, which includes styrene and derivatives thereof, (meth)acrylates, vinyl esters, unsaturated polyesters, vinyl ethers, allyl ethers, itaconates, dicyclopentadiene compounds, and unsaturated fats. Of these, unsaturated polyester resins and vinyl ester resins are particularly suitable and are described, for example, in applications EP 1 935 860 A1, DE 195 31 649 A1, and WO 10 / 108939 A1. Vinyl ester resins are most preferred due to their hydrolytic resistance and excellent mechanical properties.

[0033] Examples of suitable unsaturated polyesters that can be used in the two-component mortar composition according to the invention are divided into the following categories: (1) Ortho resins: these are based on phthalic anhydride, maleic anhydride, or fumaric acid and glycols, such as 1,2-propylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propylene glycol, dipropylene glycol, tripropylene glycol, neopentyl glycol, or hydrogenated bisphenol A; (2) Iso resins: these are made from isophthalic acid, maleic anhydride, or fumaric acid and glycols. These resins may contain higher proportions of reactive diluents than ortho resins; (3) Bisphenol A fumarates: these are based on ethoxylated bisphenol A and fumaric acid; (4) HET acid resins (hexachloro-endo-methylene-tetrahydrophthalic acid resins): are resins obtained from chlorine / bromine-containing anhydrides or phenols in the production of unsaturated polyester resins.

[0034] In addition to these resin classes, the so-called dicyclopentadiene resins (DCPD resins) can also be distinguished as unsaturated polyester resins. This class of DCPD resins is obtained either by modifying one of the above-mentioned resin types through a Diels-Alder reaction with cyclopentadiene, or alternatively, by a first reaction of a diacid, e.g., maleic acid, with dicyclopentadiene, followed by a second reaction, the usual production of an unsaturated polyester resin, the latter being referred to as a DCPD maleate resin.

[0035] The unsaturated polyester resin preferably has a molecular weight Mn in the range of 500 to 10,000 Daltons, more preferably in the range of 500 to 5,000, and even more preferably in the range of 750 to 4,000 (according to ISO 13885-1). The unsaturated polyester resin has an acid value in the range of 0 to 80 mg KOH / g resin, preferably in the range of 5 to 70 mg KOH / g resin (according to ISO 2114-2000). If a DCPD resin is used as the unsaturated polyester resin, the acid value is preferably 0 to 50 mg KOH / g resin.

[0036] For the purposes of the invention, vinyl ester resins are oligomers or polymers with at least one (meth)acrylate end group, so-called (meth)acrylate-functionalized resins, which also include urethane (meth)acrylate resins and epoxy (meth)acrylates.

[0037] Vinyl ester resins that contain unsaturated groups only in the terminal position are obtained, for example, by reacting epoxy oligomers or polymers (e.g., bisphenol A diglycidyl ether, phenol novolak-type epoxides, or tetrabromobisphenol A-based epoxy oligomers) with, for example, (meth)acrylic acid or (meth)acrylamide. Preferred vinyl ester resins are (meth)acrylate-functionalized resins and resins obtained by reacting an epoxy oligomer or polymer with methacrylic acid or methacrylamide, preferably with methacrylic acid. Examples of such compounds are known from applications US 3297745 A, US 3772404 A, US 4618658 A, GB 2217722 A1, DE 3744390 A1, and DE 4131457 A1. In this context, reference is made to application US 2011 / 071234.

[0038] The vinyl ester resin preferably has a molecular weight Mn in the range of 500 to 3000 Daltons, more preferably 500 to 1500 Daltons (according to ISO 13885-1). The vinyl ester resin has an acid value in the range of 0 to 50 mg KOH / g resin, preferably in the range of 0 to 30 mg KOH / g resin (according to ISO 2114-2000).

[0039] Particularly suitable as vinyl ester resins are ethoxylated bisphenol A di(meth)acrylate with a degree of ethoxylation of 2 to 10, preferably 2 to 4, difunctional, trifunctional or higher-functional urethane (meth)acrylate oligomers or mixtures of these curable components.

[0040] Examples of such epoxy(meth)acrylates are those of formula (I) where n is a number greater than or equal to 1 (if mixtures of different molecules with different n values ​​are present and are represented by the formula (I), non-integer numbers are also possible as the mean value).

[0041] Further examples of the propoxylated or especially ethoxylated aromatic diols, such as bisphenol A, bisphenol F or novolak (especially di-)(meth)acrylates are those of the formula (II) wherein a and b each independently represent a number greater than or equal to 0, with the proviso that preferably at least one of the values ​​is greater than 0, preferably both are 1 or greater (if mixtures of different molecules with different (a and b) values ​​are present and are represented by the formula (II), non-integer numbers are also possible as the mean value).

[0042] Particularly suitable are the known reaction products of di- or polyisocyanates and hydroxyalkyl methyl acrylates, as described, for example, in DE 2 312 559 A1, adducts of (di)isocyanates and 2,2-propanebis-[3-(4-phenoxy)-1,2-hydroxypropane-1-methacrylate] according to US Pat. No. 3,629,187, and the adducts of isocyanates and methacryloyl alkyl ethers, alkoxybenzenes, or alkoxycycloalkanes, as described in EP 44352 A1. In this context, reference is made to DE 2312559 A1, DE 19902685 A1, EP 0684906 A1, DE 4111828 A1, and DE 19961342 A1. Of course, mixtures of suitable monomers can also be used.

[0043] All these resins which can be used according to the invention can be modified according to methods known to those skilled in the art, for example to achieve lower acid numbers, hydroxide numbers or anhydride numbers, or to make them more flexible by incorporating flexible units into the backbone, and the like.

[0044] In addition, the resin may contain other reactive groups that can be polymerized with a radical initiator, such as peroxides, for example reactive groups derived from itaconic acid, citraconic acid and allylic groups and the like, as described, for example, in WO 2010 / 108939 A1 (itaconic acid esters).

[0045] The percentage (in wt. % of the resin component) of radically curable resin in the resin component (A) is advantageously more than about 5%, preferably more than about 15%, and particularly preferably more than about 20%. The percentage (in wt. % of the resin component) of radically curable resin in the resin component is advantageously from about 10% to about 90%, preferably from about 15% to about 80%, more preferably from about 20% to about 60%, more preferably from about 25% to about 55%, even more preferably from about 30% to about 55%, particularly preferably from about 30% to about 50%, and most preferably from about 32% to about 45%.

[0046] The radically curable resin in component (A) of the mortar composition according to the invention preferably comprises a urethane (meth)acrylate resin and / or a (meth)acrylate-modified epoxy resin. In a preferred embodiment, the radically curable resin is a urethane (meth)acrylate resin.

[0047] To produce a suitable urethane (meth)acrylate resin, an at least difunctional isocyanate can be reacted with one or more hydroxy-functional, ethylenically unsaturated compounds, in particular with hydroxy-functional (meth)acrylic compounds.

[0048] The at least difunctional isocyanate for producing the urethane (meth)acrylate resin can be an aromatic isocyanate, an aliphatic isocyanate, in particular a cycloaliphatic isocyanate and a prepolymer containing isocyanate groups, which can also be used in a mixture with one another.

[0049] Examples of suitable aliphatic and aromatic isocyanates include m-phenylene diisocyanate, toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, hexamethylene-1,6-diisocyanate, tetramethylene-1,4-diisocyanate, cyclohexane-1,4-diisocyanate, hexahydrotoluene diisocyanate, naphthylene-1,5-diisocyanate, methoxyphenyl-2,4-diisocyanate, diphenylmethane-4,4'-diisocyanate, 4,4'-biphenylene diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 4,4',4"-triphenylmethane triisocyanate, polymethylenepolyphenyl isocyanate (PMDI), toluene-2,4,6-triisocyanate and 4,4'-Dimethyldiphenylmethane-2,2',5,5'-tetraisocyanate.

[0050] Diphenylmethane 4,4'-diisocyanate, diphenylmethane 2,4'-diisocyanate, and mixtures thereof are collectively referred to as MDI, and all can be used. Toluene 2,4-diisocyanate, toluene 2,6-diisocyanate, and mixtures thereof are collectively referred to as TDI, and all can be used.

[0051] Preferably, the polyisocyanate is selected from the group consisting of diphenylmethane diisocyanate (MDI), polymeric diphenylmethane diisocyanate (PMDI), tolylene diisocyanate (TDI), hexane diisocyanate (HDI), isophorone diisocyanate (IPDI) and mixtures thereof.

[0052] Isocyanate prepolymers prepared by reacting a stoichiometric excess of any polyisocyanate with an isocyanate-reactive compound as a chain extender can also be used, optionally in admixture with the above-mentioned aromatic and aliphatic isocyanates.

[0053] Examples of such chain extenders are dihydric alcohols such as ethanediol, diethylene glycol, triethylene glycol and polyethylene glycol, propanediol, dipropylene glycol, tripropylene glycol and polypropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol and diethanolamine, further aromatic alcohols such as bisphenol A and bisphenol F or their ethoxylation products, hydrogenation products and / or halogenation products, higher-hydric alcohols such as glycerol, trimethylolpropane, hexanetriol and pentaerythritol, hydroxyl-containing polyethers such as, for example, oligomers of aliphatic or aromatic oxiranes and / or higher cyclic ethers, for example of ethylene oxide, propylene oxide, styrene oxide and furan, polyethers which contain aromatic structural units in the main chain, such as, for example, the polyethers of bisphenol A and F, and hydroxyl-containing polyesters based on the above-mentioned alcohols and polyethers with dicarboxylic acids or their Anhydrides such as adipic acid,Phthalic acid, tetra- or hexahydrophthalic acid, hetic acid, maleic acid, fumaric acid, itaconic acid and sebacic acid.

[0054] Chain extenders with aromatic structural units serve to stiffen the resin chain. Hydroxyl compounds with unsaturated structural units, such as fumaric acid, can be used to increase crosslinking density during curing. Branched or star-shaped hydroxyl compounds as chain extenders, especially trihydric and higher alcohols, as well as polyethers and / or polyesters containing their structural units, result in branched or star-shaped urethane (meth)acrylates, which exhibit lower resin viscosity and improved solubility in reactive diluents.

[0055] The hydroxy-functional (meth)acrylic compound for producing the urethane (meth)acrylate resin of resin component (A) is preferably a (meth)acrylic acid hydroxyalkyl ester, such as hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, polyoxyethylene (meth)acrylate, polyoxypropylene (meth)acrylate, or a hydroxyl-containing (meth)acrylic acid ester of polyhydric alcohols such as pentaerythritol tri(meth)acrylate, glycerol di(meth)acrylate, trimethylolpropane di(meth)acrylate and neopentyl glycol mono(meth)acrylate.

[0056] The term used here and below "(Meth)acrylic..." or "...(meth)acrylic..." means that this designation should include both the acrylic group and the methacrylic group.

[0057] The reaction of the at least difunctional isocyanate with the hydroxy-functional, ethylenically unsaturated compound is carried out in such a way that the resulting free-radically curable resin of resin component (A) is essentially free of free isocyanate groups. Essentially free here means that the resin has an NCO content of less than 2%, preferably less than 1%, and particularly preferably less than 0.3%. For this purpose, the hydroxy-functional, ethylenically unsaturated compound is used in a stoichiometric excess over the isocyanate groups.

[0058] Other radically curable resins that can be used include vinyl esters, epoxy (meth)acrylates, unsaturated polyester resins and mixtures thereof, alone or together with the (poly)urethane (meth)acrylate described above.

[0059] Unsaturated polyester resins are obtained by reacting unsaturated dicarboxylic acids such as o- and / or iso-phthalic acid, maleic acid and fumaric acid with dialcohols.

[0060] Condensates of (meth)acylic acid with glycidyl ethers of bisphenol A, bisphenol F or novolaks are commonly used as epoxy (meth)acrylates.

[0061] The radically curable resin is preferably present in a proportion of 10 to 40 percent by weight in the mortar mass.

[0062] According to a preferred embodiment of the invention, the resin component (A) in all embodiments described above contains, as a further constituent, at least one reactive diluent having at least one ethylenically unsaturated group. Suitable reactive diluents are, in particular, (meth)acrylate compounds as well as allyl and vinyl compounds.

[0063] Suitable reactive diluents are described in EP 1 935 860 A1 and DE 195 31 649 A1. The resin mixture preferably contains a (meth)acrylic acid ester as the reactive diluent, with particular preference being given to aliphatic or aromatic C 5 -C 15 (meth)acrylates.Geeignete Beispiele umfassen: Hydroxypropyl(meth)acrylat, 1,2-Ethandioldi-(meth)acrylat, 1,3-Propandioldi(meth)acrylat, 1,2-Butandioldi(meth)acrylat, 1,4-Butandioldi(meth)acrylat (BBDMA), Trimethylolpropantri(meth)acrylat, Phenethyl-(meth)acrylat, Tetrahydrofurfuryl(meth)acrylat, Ethyltriglykol(meth)acrylat, N,N-Dimethylaminoethyl(meth)acrylat, N,N-Dimethylaminomethyl(meth)acrylat, Acetoacetoxyethyl(meth)acrylat, lsobornyl(meth)acrylat, 2-Ethylhexyl(meth)acrylat, Diethylenglykoldi(meth)acrylat, Methoxypolyethylenglykolmono(meth)acrylat, Trimethylcyclohexyl(meth)acrylat, 2-Hydroxyethyl(meth)acrylat, Dicyclopentenyloxyethyl(meth)acrylat und / oder Tricyclopentadienyldi(meth)acrylat, Bisphenol-A-(meth)acrylat, Novolakepoxidi(meth)acrylat, Di-[(meth)acryloyl-maleoyl]-tricyclo-5.2.1.0.2.6-decan, Dicyclopentenyloxyethylcrotonat, 3-(Meth)acryloyl-oxymethyl-tricylo-5.2.1.0.2.6-decane, 3-(meth)cyclopentadienyl (meth)acrylate, isobornyl (meth)acrylate and decalyl-2-(meth)acrylate; PEG di(meth)acrylates, such as PEG200 di(meth)acrylate, tetraethylene glycol di(meth)acrylate, solketal (meth)acrylate, cyclohexyl (meth)acrylate, phenoxyethyl di(meth)acrylate, methoxyethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, tert-butyl (meth)acrylate and norbornyl (meth)acrylate.

[0064] In principle, other conventional, radically curable compounds can also be used, alone or in admixture with the (meth)acrylic acid esters, e.g. styrene, α-methylstyrene, alkylated styrenes such as tert-butylstyrene, divinylbenzene and allyl compounds, with preference being given to those not subject to labelling requirements.

[0065] Particularly preferred reactive diluents are hydroxypropyl (meth)acrylate, 1,4-butanediol di(meth)acrylate and butanediol-1,2-di(meth)acrylate.

[0066] The reactive diluent serves both as a solvent for the radically curable resin and as a comonomer that participates in the radical polymerization of the resin component. The use of reactive diluents further improves the adhesion of the cured mortar to the surfaces of the mineral substrate and / or the component to be fixed.

[0067] The reactive diluent is preferably present in the mortar composition in a proportion of 0 to 25 percent by weight, more preferably 4 to 25 percent by weight, and particularly preferably 8 to 15 percent by weight. All radically curable compounds are preferably present in the mortar composition in a proportion of up to a maximum of 30 percent by weight.

[0068] According to a further preferred embodiment of the invention, resin component (A) contains at least one accelerator for the curing agent. Suitable accelerators, which are usually added to the resin mixture, are known to those skilled in the art. These include, for example, amines, preferably tertiary amines, and / or metal salts.

[0069] Suitable amines are selected from the following compounds, which are described, for example, in the application US 2011071234 A1: dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, n-propylamine, di-n-propylamine, tri-n-propylamine, isopropylamine, diisopropylamine, triisopropylamine, n-butylamine, isobutylamine, tert-butylamine, di-n-butylamine, diisobutylamine, tri-isobutylamine, pentylamine, isopentylamine, diisopentylamine, hexylamine, octylamine, dodecylamine, laurylamine, stearylamine, aminoethanol, diethanolamine, triethanolamine, aminohexanol, ethoxyaminoethane, dimethyl-(2-chloroethyl)amine, 2-ethylhexylamine, bis-(2-chloroethyl)amine, 2-ethylhexylamine, bis-(2-ethylhexyl)amine, N-methylstearylamine, Dialkylamine, ethylenediamine, N,N'-dimethylethylenediamine, tetramethylethylenediamine, diethylenetriamine, permethyldiethylenetriamine, triethylenetetramine, tetraethylenepentamine, 1,2-diaminopropane, di-propylenetriamine, tripropylenetetramine, 1,4-diaminobutane, 1,6-diaminohexane,4-Amino-1-diethylaminopentan, 2,5-Diamino-2,5-dimethylhexan, Trimethylhexamethylendiamin, N,N-Dimethylaminoethanol, 2-(2-Diethylaminoethoxy)ethanol, Bis-(2-hydroxyethyl)-oleylamin, Tris-[2-(2-hydroxy-ethoxy)-ethyl]amin, 3-Amino-1-propanol, Methyl-(3-aminopropyl)ether, Ethyl-(3-aminopropyl)ether, 1,4-Butandiol-bis(3-aminopropylether), 3-Dimethylamino-1-propanol, 1-Amino-2-propanol, 1-Diethylamino-2-propanol, Diisopropanolamin, Methyl-bis-(2-hydroxypropyl)-amin, Tris-(2-hydroxypropyl)amin, 4-Amino-2-butanol, 2-Amino-2-methylpropanol, 2-Amino-2-methyl-propandiol, 2-Amino-2-hydroxymethylpropandiol, 5-Aiethylamino-2-pentanon, 3-Methylamino-propionsäurenitril, 6-Aminohexansäure, 11-Aminoundecansäure, 6-Amino-hexansäureethylester, 11-Aminohexansäureisopropylester, Cyclohexylamin, N-Methylcyclohexylamin, N,N-Dimethylcyclohexylamin, Dicyclohexylamin, N-Ethylcyclohexylamin, N-(2-Hydroxyethyl)-cyclohexylamin, N,N-Bis-(2-hydroxyethyl)-cyclohexylamin, N-(3-Aminopropyl)-cyclohexylamin,Aminomethylcyclohexan, Hexahydrotoluidin, Hexahydrobenzylamin, Anilin, N-Methylanilin, N,N-Dimethylanilin, N,N-Diethylanilin, N,N-Di-propylanilin, iso-Butylanilin, Toluidine, Diphenylamin, Hydroxyethylanilin, Bis-(hydroxyethyl)anilin, Chloranilin, Aminophenole, Aminobenzoesäuren und deren Ester, Benzylamin, Dibenzylamin, Tribenzylamin, Methyldibenzylamin, α-Phenylethylamin, Xylidin, Diisopropylanilin, Dodecylanilin, Aminonaphthalin, N-Methylaminonaphthalin, N,N-Dimethylaminonaphthalin, N,N-Dibenzylnaphthalin, Diaminocyclohexan, 4,4'-Diaminodicyclohexylmethan, Diamino-dimethyl-dicyclohexylmethan, Phenylendiamin, Xylylendiamin, Diaminobiphenyl, Naphthalindiamine, Toluidine, Benzidine, 2,2-Bis-(aminophenyl)-propan, Aminoanisole, Amino-thiophenole, Aminodiphenylether, Aminocresole, Morpholin, N-Methylmorpholin, N-Phenylmorpholin, Hydroxyethylmorpholin, N-Methylpyrrolidin, Pyrrolidin, Piperidin, Hydroxyethylpiperidin, Pyrrole, Pyridine, Chinoline, Indole, Indolenine, Carbazole, Pyrazole,Imidazoles, thiazoles, pyrimidines, quinoxalines, aminomorpholine, dimorpholinethane, [2,2,2]-diazabicyclooctane, and N,N-dimethyl-p-toluidine.,

[0070] Preferred amines are aniline derivatives and N,N-bisalkylarylamines, such as N,N-dimethylaniline, N,N-diethylaniline, N,N-dimethyl-p-toluidine, N,N-bis(hydroxyalkyl)arylamines, N,N-bis(2-hydroxyethyl)anilines, N,N-bis(2-hydroxyethyl)toluidine, N,N-bis(2-hydroxypropyl)aniline, N,N-bis(2-hydroxypropyl)toluidine, N,N-bis(3-methacryloyl-2-hydroxypropyl)-p-toluidine, N,N-dibutoxyhydroxypropyl-p-toluidine and 4,4'-bis(dimethylamino)diphenylmethane.

[0071] Polymeric amines, such as those obtained by polycondensation of N,N-bis(hydroxyalkyl)aniline with dicarboxylic acids or by polyaddition of ethylene oxide and these amines, are also suitable as accelerators.

[0072] Suitable metal salts include cobalt octoate or cobalt naphthenoate as well as vanadium, potassium, calcium, copper, manganese or zirconium carboxylates.

[0073] The resin mixture may further contain a co-accelerator, particularly when a transition metal compound is used as the accelerator. Depending on the transition metal compound chosen, the skilled person is able to select a suitable co-accelerator to achieve the desired curing properties. If a cobalt compound is used as the accelerator, the co-accelerator is preferably an amine and / or a 1,3-dioxo compound. If a copper compound is used as the accelerator, the co-accelerator is preferably an amine, an acetoacetamide, a potassium salt, an imidazole, and / or a gallate, or mixtures thereof. If a manganese compound is used as the accelerator, the co-accelerator is preferably a 1,3-dioxo compound, a thiol, and / or a potassium or lithium salt, or mixtures thereof.If an iron compound is used as an accelerator, the co-accelerator is preferably a 1,3-dioxo compound and / or a thiol, preferably in combination with an alkali metal salt. Suitable 1,3-dioxo compounds are acetylacetone, acetoacetates, and acetoacetamides.

[0074] The accelerators and / or co-accelerators are preferably contained in the mortar mass in a proportion of 0 to 1% by weight, preferably 0.01-0.7% by weight.

[0075] Furthermore, the resin component (A) may contain one or more of the conventional polymerization inhibitors to stabilize the resin mixtures against premature polymerization and to adjust the gel time, preferably in a proportion of 0 to 0.2 percent by weight, based on the total weight of the mortar composition. Suitable polymerization inhibitors are the polymerization inhibitors commonly used for radically curable compounds, as known to the person skilled in the art. Examples of such polymerization inhibitors are in particular hydroquinone, substituted hydroquinones, e.g. 4-methoxyphenol, phenothiazine, benzoquinone or tert-butylpyrocatechol, as described for example in EP 1935860 A1 or EP 0965619 A1, nitroxyl compounds, in particular stable nitroxyl radicals, also called N-oxyl radicals, such as piperidinyl-N-oxyl or tetrahydropyrrole-N-oxyl, as described in DE 19531649 A1.Particularly preferred is 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (hereinafter referred to as Tempol) for stabilization.

[0076] The polymerization inhibitors are preferably selected from phenolic compounds and non-phenolic compounds, such as stable radicals and / or phenothiazines.

[0077] Phenols such as 2-methoxyphenol, 4-methoxyphenol, 2,6-di-tert-butyl-4-methylphenol, 2,4-di-tert-butylphenol, 2,6-di-tert-butylphenol, 2,4,6-trimethylphenol, 2,4,6-tris(dimethylaminomethyl)phenol, 4,4'-thio-bis(3-methyl-6-tert-butylphenol), 4,4'-isopropylidenediphenol, 6,6'-di-tert-butyl-4,4'-bis(2,6-di-tert-butylphenol), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2,2'-methylene-di-p-cresol, Catechol and butylcatechols, such as 4-tert-butylcatechol, 4,6-di-tert-butylcatechol, hydroquinones, such as hydroquinone, 2-methylhydroquinone, 2-tert-butylhydroquinone, 2,5-di-tert-butylhydroquinone, 2,6-di-tert-butylhydroquinone, 2,6-dimethylhydroquinone, 2,3,5-trimethylhydroquinone, benzoquinone, 2,3,5,6-tetrachloro-1,4-benzoquinone, methylbenzoquinone, 2,6-dimethylbenzoquinone, naphthoquinone, or mixtures of two or more thereof,in question.,

[0078] Preferred non-phenolic polymerization inhibitors are phenothiazines, such as phenothiazine and / or derivatives or combinations thereof, or stable organic radicals, such as galvinoxyl and N-oxyl radicals.

[0079] Suitable stable N-oxyl radicals (nitroxyl radicals) can be selected from 1-oxyl-2,2,6,6-tetramethylpiperidine, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-ol (also referred to as TEMPOL), 1-oxyl-2,2,6,6-tetramethylpiperidin-4-one (also referred to as TEMPON), 1-oxyl-2,2,6,6-tetramethyl-4-carboxyl-piperidine (also referred to as 4-carboxy-TEMPO), 1-oxyl-2,2,5,5-tetramethylpyrrolidine, 1-oxyl-2,2,5,5-tetramethyl-3-carboxylpyrrolidine (also referred to as 3-carboxy-PROXYL), aluminum N-nitrosophenylhydroxylamine, diethylhydroxylamine, as described in the DE199 56 509. Further suitable N-oxyl compounds are oximes, such as acetaldoxime, acetone oxime, methyl ethyl ketoxime, salicyloxime, benzoxime, glyoximes, dimethylglyoxime, acetone-O-(benzyloxycarbonyl)oxime, and the like. Furthermore, pyrimidinol or pyridinol compounds substituted in the para position to the hydroxyl group can be used as polymerization inhibitors, as described in DE 10 2011 077 248 B1.

[0080] Depending on the desired properties and the application of the resin mixture, the polymerization inhibitors can be used either alone or in combination with two or more of them. The combination of phenolic and non-phenolic polymerization inhibitors enables a synergistic effect, as demonstrated by the essentially drift-free adjustment of the gel time of the reaction resin formulation.

[0081] Finally, the mortar composition may contain further organic additives such as adhesion promoters based on silane compounds, as are known to the person skilled in the art, for example, from EP 2 371 782 A2 and WO 2011 / 072789 A1.

[0082] The curing agent contained in the curing component (B) of the two-component mortar composition according to the invention for the radically curable resin of the resin component (A) preferably comprises at least one organic peroxide, for example dibenzoyl peroxide, methyl ethyl ketone peroxide, tert-butyl perbenzoate, cyclohexanone peroxide, lauryl peroxide, cumene hydroperoxide and / or tert-butyl peroxy-2-ethylhexanoate.

[0083] The organic peroxides are preferably desensitized, in particular by adding water as a desensitizing agent and / or solvent. Suitable curing components are known to those skilled in the art and are commercially available.

[0084] Alternatively, a hardener system can be used for curing which is peroxide-free and contains the components at least one manganese compound as accelerator and one 1,3-dioxo compound as initiator This includes the DE 10 2011 078 785 A1 referred to.

[0085] Alternatively, a hardener system can be used for curing, which contains the following components: as accelerator at least one metal salt and as initiator at least one compound containing thiol and / or thiolester groups, This includes the DE 10 2013 114 061 A1 referred to.

[0086] By combining or mixing the two components, radicals can be formed which, instead of the radical formers commonly used, can trigger a polymerization of non-aromatic double bonds, e.g. olefinic double bonds, for example acrylates or methacrylates.

[0087] As a further alternative, a hardener system can be used for curing, which contains the following components: as accelerator at least one metal salt and as initiator at least one CH-acidic compound of the formulawherein (i) -A- represents -C(R 1< )(R 2< )-, -X- represents a bond, -NR 3< - or -(CR 4< R 5< ) p -, or -O-, Y represents NR 6< or (CR 7< R 8< ) q, or O, where X represents O and Y also represents O; preferably where X represents (CR 4< R 5< ) p and Y represents CR 7< R 8<, or X represents NR 3< and Y represents NR 6<; Z 1< stands for O, S, S=O or S(=O) 2, Z 2< stands for O, S, S=O or S(=O) 2, Z 3< stands for O, S, S=O or S(=O) 2 or for R 9< and R 10<, p stands for 1, 2 or 3, preferably for 1 or 2, q stands for 1, 2 or 3, preferably for 1; and the radicals R 1< , R 2< , R 3< , R 4< , R 5< , R 6< , R 7< , R 8< , R 9< and R 10< independently of one another stand for hydrogen, alkyl, aryl, aralkyl, cycloalkyl or cycloalkylalkyl and are each unsubstituted or substituted and / or heteroatoms (instead of C atoms;preferably selected from O, N, such as NH or N-alkyl, and S, with the proviso that at least one of the radicals R 1< and R 2< is hydrogen, or (ii) open-chain compounds in which the bridge-forming member -C(=Z 3< )- is missing, -A- is -C(R 1< )(R 2< )-, X and Y independently of one another represent a C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group, which is in each case unbranched or branched, unsubstituted or substituted and optionally contains heteroatoms (instead of C atoms; in particular selected from O, N, such as NH or N-alkyl, and S), or preferably a C 1 -C 4 -alkoxycarbonylmethyl group or C 1 -C 4 -alkylcarbonylmethyl group, R 1< and R 2< both represent hydrogen and Z 1< and Z 2< have the meanings given;or X represents a C 1 -C 4 alkyl group or C 1 -C 4 alkoxy group or C 1 -C 4 alkoxycarbonylmethyl group or C 1 -C 4 alkylcarbonylmethyl group, which may be unbranched or branched, unsubstituted or substituted, or optionally containing heteroatoms (instead of C atoms; in particular selected from O, N, such as NH or N-alkyl, and S), Y and Z 2< together with the bonding carbon atom represent -CN, Z 1< has the meanings given above, and R 1< and R 2< are each as defined above with the proviso that at least one of the radicals represents hydrogen; and / or salts thereof. Reference is made to DE 10 2015 003 221 A1. ;

[0088] The components used as accelerators in the form of a metal salt, which also includes metal complexes and metal oxides, are in both cases preferably one or more metal salts or in particular salts of organic and / or inorganic acids with metals, e.g. selected from cobalt, zirconium, zinc, cerium, tin, bismuth or preferably vanadium, manganese, copper or iron, or mixtures of two or more thereof, wherein the organic acids are preferably saturated, with vanadium and iron or in particular manganese and copper, optionally in the presence of one or two co-accelerators with a metal portion from the group of the above-mentioned metals, being preferred, in particular in the form of salts or complexes with inorganic acids and / or carboxylate radicals, such as carboxylates with CH 3 , C 2 -C 20 alkyl, a C 6 -C 24 aryl radical or C 7 -C 30 aralkyl radical, for example octoate, e.g.2-Ethylhexanoate (isooctanoate), also neodecanoate, or acetylacetonate. Particularly preferred are manganese carbonate or carboxylates, such as manganese acetate or manganese octoate, copper carboxylates, such as copper octoate or copper naphthenate, copper quinolates, iron carboxylates, such as iron octoate and / or vanadium carboxylates, and / or the group of metal salts with inorganic acids, which includes, for example, iron chloride, iron sulfate, and copper chloride.

[0089] In a further alternative, a hardener system can be used for curing, which contains the following components as accelerator at least one metal salt and as initiator at least one aldehyde and / or ketone and at least one primary amine, and / or b2) at least one imine which has one or more imine structural increments of the formula wherein, independently of one another: Q represents the organic radical of the (respectively) used amine, or is hydrogen; and R 2< and R 3<, independently of one another, represent hydrogen and / or an unsubstituted or substituted, optionally containing double bonds and / or heteroatoms, singly or multiply branched or straight-chain organic radical which comprises at least one aliphatic, heteroaliphatic, alicyclic or heterocyclic molecular structure, or a combination of two or more of the aforementioned molecular structures; and / or salts thereof. Reference is made to DE 10 2016 124 075 A1.

[0090] To achieve a suitable viscosity, the hardener component may contain a proportion of inorganic fillers and modifiers such as thixotropic agents.

[0091] The two-component mortar composition according to the invention is preferably present in cartridges, cartridges or foil bags, which are characterized in that they comprise two or more separate chambers in which the resin component (A) and the hardener component (B) of the mortar composition are arranged separately from one another in a reaction-inhibiting manner.

[0092] The two-component mortar compositions according to the invention can advantageously have the following total composition of resin component (A) and hardener component (B): radically curable resin in a proportion of 4.5 to 28.5 wt.%; reactive diluent in a proportion of 0 to 25 wt.%; organic peroxide in a proportion of 0.5 to 5 wt.%; polymerization accelerator in a proportion of 0 to 1.0 wt.%; polymerization inhibitors in a proportion of 0 to 0.2 wt.%; CaO with a reactivity t 60 analogous to DIN EN 459-2 of more than 2 min in a proportion of 2 to 30 wt.%; inorganic additives in a proportion of 20 to 70 wt.%; and water in a proportion of 1 to 10 wt.%, the sum of all proportions being 100 wt.%. The total amount of CaO plus inorganic additives is preferably 60 to 85 percent by weight.

[0093] The mortar composition according to the invention is preferably composed of: 4.5-28.5 wt.% radically curable resin; 0-25 wt.% reactive thinner; 0.5-5 wt.% organic peroxide; 0-1.0 wt.% accelerator; 0-0.2 wt.% inhibitors; 0-5.0 wt.% thixotropic agent; 10-35 wt.% hydraulically setting or polycondensable material; 20-50 wt.% inorganic fillers; 5-25 wt.% CaO with a reactivity t 60 analogous to DIN EN 459-2 of more than 3 min, preferably more than 4 min, and 1-10 wt.% water, wherein the total amount of CaO, the thixotropic agent, the hydraulically setting or polycondensable material and the inorganic fillers is from 65 to 80 wt.%, in each case based on the total weight of the mortar mass.

[0094] For proper use, the resin component (A) and the hardener component (B) are emptied from the separate chambers and mixed in a suitable device, such as a static mixer. The mixture of resin component (A) and hardener component (B) is then injected into the previously cleaned borehole using a known injection device. The component to be fixed is then inserted into the mortar compound and adjusted. The curing agent of the hardener component (B) initiates the radical polymerization of the resin component (A), so that the mortar compound hardens within a few hours under ambient conditions.

[0095] The invention therefore also relates to the use of the two-component mortar composition according to the invention for the chemical fastening of components, in particular anchor threaded rods, reinforcing iron, threaded sleeves and screws, in boreholes which are present in a mineral substrate, preferably concrete.

[0096] The invention is described below with reference to preferred embodiments, which, however, are not to be understood as limiting in any way. Examples: Manufacturing of components

[0097] In a plastic bucket, the liquid components were mixed with a wooden spatula according to the tables below. Then, fillers and thickeners were added and premixed by hand before further mixing in a dissolver (PC laboratory system, volume 1 L) for 8.5 minutes under 80 mbar vacuum at 3500 rpm.

[0098] The composition of the resin component used in the following comparative examples V1 and V2 as well as the application examples A1 and A2 is shown in the following Table 1. Table 1: Resin component [Wt.%] Urethane methacrylate resin UMA121 37,7 Reactive thinner BDDMA 40,15 Reactive thinner HPMA 20,0 accelerator DiPpT 1,7 Inhibitor Tempol 0,45

[0099] Table 2 below shows the composition of comparative examples V1 and V2 and application examples A1 and A2 in wt.%. Table 2: Components V1 V2 A1 A2 A component Resin component 40 Silica TS720 3,5 quartz sand F32 41,5 cement Ternal w 15 0 0 0 CaO soft lime Nekafin 2 0 15 0 0 CaO medium quicklime Lime Fla 0 0 15 0 CaO hard burnt lime Poro C 0 0 0 15 B component Dibenzoyl peroxide BP40SAQ 30,2 Water 4,6 KH 2 PO 4 0,2 Silica Aerosil 200 1 quartz flour Millisil W6 44 Barium sulfate Blanc fixe N 20

[0100] The soft burnt lime (Nekafin 2) used in Comparative Example V1 has a reactivity t 60 of 0.47 min. The medium burnt lime (Kalk Fla) from Example A1 has a reactivity t 60 in the range of 5 to 8 min. The reactivity t 60 of the hard burnt lime (Poro C) used in Example A2 is in the range of 10 to 14 min. Determination of bond stresses R1, B7 & B8:

[0101] To determine the bond stresses achieved with the mortar mixtures, a high-strength M12 anchor threaded rod was used. This rod was anchored into a hammer-drilled hole with a diameter of 14 mm and a depth of 60 mm using the two-component mortar mixture according to the invention in C20 / 25 concrete slabs. To determine the bond stress, the failure load was determined by centrally pulling out the anchor threaded rod with close support after a curing time of 24 hours at a temperature of 23°C. The average failure load was determined based on the results of five anchors. Determination of bond stresses under B4(-10°C) conditions:

[0102] To determine the bond stresses achieved with the mortar mixtures, a high-strength M12 anchor threaded rod was used. This rod was anchored into a hammer-drilled hole with a diameter of 14 mm and a depth of 60 mm using the two-component mortar mixture according to the invention, which had previously been tempered at 0°C, in C20 / 25 concrete slabs. To determine the bond stress, the failure load was determined by centrally pulling out the anchor threaded rod with tight support after a curing time of 24 hours at a temperature of -10°C. The average failure load was determined based on the results of five anchors. Cleaning of borehole:

[0103] R1 (Reference borehole): The borehole made in dry C20 / 25 concrete is cleaned using compressed air and brush as follows: 2x compressed air 6 bar, 2x brush and 2x compressed air 6 bar.

[0104] B7: The borehole made in water-saturated C20 / 25 concrete is cleaned using a vacuum cleaner (vac) and brush (brush) as follows: 1xvac / 1xbrush / 1xvac (VAC = suction).

[0105] B8: The borehole created in water-saturated C20 / 25 concrete is cleaned as follows: 1xvac / 1xbrush / 1xvac. In this case, the borehole is filled with water after cleaning. The anchor threaded rod is anchored with the two-component mortar mixture according to the invention using a piston for between 30 minutes and one hour.

[0106] B4(-10°C): The borehole made in dry C20 / 25 concrete cooled to -10°C is cleaned using compressed air and brush as follows: 2x compressed air 6 bar, 2x brush and 2x compressed air 6 bar.

[0107] The bond stresses obtained in Comparative Examples V1 and V2 and Application Examples A1 and A2 are shown in Table 3. Table 3: V1 V2 A1 A2 Volume mixing ratio A:B 5:1 Curing time in h 24.0 Bond stress R1 in N / mm 2< 30,3 31,6 31,6 32,5 Bond stress B7 in N / mm 2< 20,3 25,6 23,6 27,8 Bond stress B8 in N / mm 2< 13,4 21,6 18,5 17,9 Bond stress B4(-10°C) in N / mm 2< 21,5 16,7 21,8 26,7

[0108] Comparative example V1 (without CaO) exhibits bond stresses that are too low under R1, B7, and B8 conditions. Comparative example V2 (with soft quicklime) exhibits higher bond stresses under R1, B7, and B8 conditions compared to V1. However, compared to V1, comparative example V2 exhibits bond stresses that are too low under B4 (-10°C) conditions.

[0109] Examples A1 and A2 clearly demonstrate that the disadvantage of soft quicklime (comparative example V2) under B4 (-10°C) conditions can be eliminated by using medium quicklime and hard quicklime: Example A2 has significantly higher bond stress under B4 (-10°C) conditions than comparative examples V1 and V2. Example A1 has a bond stress comparable to V1 and higher than V2 under B4 (-10°C) conditions.

[0110] All three lime types have higher bond stresses under moist borehole conditions B7 & B8 compared to the lime-free comparison example V1. Components used:

[0111] UMA121 HILTI / DE BDDMA Evonik Performance Materials GmbH / DE HPMA Evonik Performance Materials GmbH / DE DiPpT Saltigo GmbH, Leverkusen / Germany Tempol Evonik Performance Materials GmbH / DE TS720 Cabot / Switzerland Ternal w Kerneos As / France F32 Quartz works Frechen / DE Nekafin 2 Kalkfabrik Netstal AG CH-8754 Netstal / Switzerland Lime Fla Lhoist Germany Rheinkalk GmbH, Flandersbach plant Poro C Lhoist Germany Rheinkalk GmbH, Hönnetal plant BP40SAQ United Initiators GmbH & Co. KG / DE KH 2 PO 4 MERK KGaA Aerosil 200 Evonik Resource Efficiency GmbH / DE Millisil W6 Quartz works Frechen / DE Blanc fixe N Sachtleben Chemie GmbH / DE

Claims

1. Two-component mortar composition comprising a resin component (A) which contains at least one radically curable resin as a curable constituent, and comprising a hardener component (B) which contains a curing agent for the radically curable resin of the resin component (A), the resin component (A) and / or the hardener component (B) containing at least CaO as a further constituent, characterized in that the CaO has a reactivity t60 analogous to DIN EN 459-2 of more than 2 minutes.

2. Mortar composition according to claim 1, wherein the CaO has a reactivity t60 analogous to DIN EN 459-2 of at least 3 minutes, preferably at least 4 minutes.

3. Mortar composition according to one of claims 1 and 2, wherein the CaO is present in a proportion of 2 to 30 percent by weight, preferably 5 to 25 percent by weight, more preferably 10 to 20 percent by weight, based on the total weight of the composition.

4. Mortar composition according to one of the preceding claims, wherein the resin component (A) and / or the hardener component (B) contains, as a further constituent, an inorganic additive selected from inorganic fillers, hydraulically setting or polycondensable inorganic compounds, modifiers and mixtures thereof.

5. Mortar composition according to claim 4, wherein the inorganic additive comprises a filler selected from BaSO4, quartz, glass, corundum, porcelain, earthenware, barite, light spar, gypsum, talc, chalk and mixtures thereof.

6. Mortar composition according to one of claims 4 and 5, wherein the inorganic additive comprises a hydraulically setting or polycondensable inorganic compound selected from the group consisting of cement and gypsum and mixtures thereof, preferably an aluminate cement.

7. Mortar composition according to one of claims 4 to 6, wherein the inorganic additive comprises a modifier selected from the group consisting of thickeners, plasticizers, thixotropic agents and mixtures thereof, preferably precipitated or fumed silica, bentonites and / or kaolin.

8. Mortar composition according to one of the preceding claims, characterized in that the radically curable resin comprises a urethane (meth)acrylate resin.

9. Mortar composition according to one of the preceding claims, wherein the resin component (A) contains at least one reactive diluent as a further constituent.

10. Mortar composition according to one of the preceding claims, wherein the resin component (A) comprises at least one accelerator as a further constituent.

11. Mortar composition according to one of the preceding claims, wherein the hardener component (B) at least one organic peroxide, in particular dibenzoyl peroxide, methyl ethyl ketone peroxide, tert-butyl perbenzoate, cyclohexanone peroxide, lauryl peroxide, cumene hydroperoxide and / or tert-butyl peroxy-2-ethylhexanoate, as the curing agent.

12. Mortar composition according to one of the preceding claims, wherein the mortar composition is composed of: the radically curable resin in a proportion of 4.5 to 28.5 wt.%; at least one reactive diluent in a proportion of 0 to 25 wt.%; an organic peroxide in a proportion of 0.5 to 5 wt.%; an accelerator in a proportion of 0 to 1.0 wt.%; a polymerization inhibitor in a proportion of 0 to 0.2 wt.%; CaO with a reactivity t60 analogous to DIN EN 459-2 of more than 2 minutes in a proportion of 2 to 30 wt.%; a further inorganic additive in a proportion of 20 to 70 wt.%; and water in a proportion of 1 to 10 wt.%, the sum of all parts being 100 percent by weight.

13. Mortar composition according to one of the preceding claims, wherein the composition is in a capsule, a cartridge or a film pouch, and wherein the resin component (A) and the hardener component (B) are arranged in separate chambers.

14. Use of the two-component mortar composition according to one of the preceding claims for the chemical fastening of constituents, such as anchor threaded rods, reinforcing bars, threaded sleeves and screws, in boreholes that are present in a mineral substrate.