Self-flowing mortar-like composition, hardened product thereof, and construction method using the same

Abstract

To provide a resin mortar-like composition that maintains fluidity and can be highly filled.SOLUTION: Provided is a mortar-like composition, which is a mortar-like composition having self-fluidity obtained by mixing a filler (A) and a reaction-curable binder resin (B) at a mass ratio of (A):(B)=2:1 to 10:1, and in which the surface dynamic friction coefficient of the composition after curing is 0.3 or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a self-flowing mortar-like composition. [Background technology]

[0002] Fillers are added to resin mortar (mortar containing reactive curing resin) to reduce costs and suppress shrinkage during curing. However, increasing the amount of filler added reduces the fluidity of the resin mortar, which has the drawback of making it less workable during pouring and finishing processes. To solve this drawback, methods such as improving the composition of the monomers used in the binder resin, adjusting the particle size of the filler, and adding surfactants have been used (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-083845 [Patent Document 2] Japanese Patent Application Publication No. 4-164949 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional improvement methods such as those described in Patent Documents 1 and 2 have problems such as limitations on the types of fillers that can be used and a limit on the amount of filler that can be added that is small compared to the amount of binder resin, and there is a need to develop more effective means of improving fluidity. [Means for solving the problem]

[0005] After extensive investigation, the inventors discovered that a novel mortar-like composition can be obtained by mixing a filler and a reactive curing binder resin in a predetermined mass ratio so that the composition has self-fluidity before curing and so that the dynamic friction coefficient of the surface of the cured body is 0.3 or more after curing, and thus arrived at the present invention.

[0006] That is, embodiments of the present invention can provide the following:

[0007] [1] A mortar-like composition having self-flowability, which is obtained by mixing a filler (A) and a reactive curable binder resin (B) in a mass ratio of (A):(B) = 2:1 to 10:1, and which is characterized in that the dynamic friction coefficient of the surface of the composition after curing is 0.3 or more.

[0008] [2] The mortar-like composition according to [1], characterized in that the viscosity of the reactive curable binder resin (B) is 1,000 mPa·s or less and 200 mPa·s or more when measured at 15°C and 20 rpm using a Brookfield viscometer.

[0009] [3] The mortar-like composition according to [1] or [2], wherein the reaction-curable binder resin (B) contains a (meth)acrylic resin.

[0010] [4] The mortar-like composition according to any one of [1] to [3], wherein the filler (A) comprises aggregate (A-1) having an average particle size of 0.1 mm or more and aggregate (A-2) having an average particle size of 0.01 mm or less.

[0011] [5] The mortar-like composition according to [4], characterized in that the aggregate (A-1) and / or the aggregate (A-2) contain one or more selected from the group consisting of silica sand, talc, calcium carbonate, alumina, fly ash, iron oxide, and titanium oxide.

[0012] [6] The mortar-like composition according to [4] or [5], wherein the mass ratio of the aggregate (A-1) to the aggregate (A-2) is 90-95:5-10, where the total mass of the aggregate (A-1) and the aggregate (A-2) is 100 parts by mass.

[0013] [7] The mortar-like composition according to any one of [1] to [6], which is curable.

[0014] [8] A hardened body of the mortar-like composition described in [7].

[0015] [9] A construction method comprising a step of applying the mortar-like composition according to any one of [1] to [7] to a structure in the atmosphere.

[0016]

[10] A structure constructed using the construction method described in [9]. [Effects of the Invention]

[0017] According to an embodiment of the present invention, even when the mass ratio of the filler to the reactive curable binder resin is increased up to 10 times, the mortar-like resin composition before curing can maintain its self-fluidity, and the dynamic friction coefficient of the surface after curing can also be improved, resulting in the surprising effect of achieving two physical properties that were previously thought to be contradictory. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described in detail below. Numerical ranges described herein include the upper and lower limits unless otherwise specified.

[0019] In this specification, "self-fluidity" refers to the property of an uncured material to spread evenly (self-leveling) when applied to a surface. This property is not determined solely by viscosity, but is obtained by mixing the filler (A) and reactive curable binder resin (B) in a specified mass ratio.

[0020] The mixing ratio of the filler (A) to the reactive curable binder resin (B) may be in the range of 2:1 to 10:1 by mass, more preferably 4:1 to 8:1. If the amount of filler (A) is too small (mass ratio less than 2:1), the viscosity may be low and the filler may settle. On the other hand, if the amount of filler (A) is too large (mass ratio greater than 10:1), the fluidity may decrease, which may result in poor workability.

[0021] From the viewpoint of improving the leveling properties due to self-flow, it is preferable that the filler (A) contains aggregate (A-1) having an average particle size of 0.1 mm or more and aggregate (A-2) having an average particle size of 0.01 mm or less. Examples of such aggregates include silica sand, talc, calcium carbonate, alumina, fly ash, iron oxide, and titanium oxide. One or more of these can be used. Among these, one or more of silica sand and calcium carbonate are preferred due to the ease of controlling the particle size distribution. However, powders with too fine a particle size (such as the silica sand powder described in Patent Document 1) are not necessarily suitable. For example, the lower limit of the average particle size is preferably 0.001 mm or more. Furthermore, particles that are too coarse may also be inappropriate, so for example, the upper limit of the average particle size is preferably 1.0 mm. Note that the average particle size in this specification can be measured by known methods, such as the laser diffraction scattering method based on JIS Z8825:2013.

[0022] The aggregate (A-1) having an average particle size of 0.1 mm or more preferably has an average particle size of 10 mm or less, more preferably has an average particle size of 5 mm or less, and most preferably has an average particle size of 1 mm or less. The aggregate (A-2) having an average particle size of 0.01 mm or less preferably has an average particle size of 0.0001 mm or more, more preferably has an average particle size of 0.0005 mm or more, and most preferably has an average particle size of 0.001 mm or more.

[0023] The aggregate (A-1) having an average particle size of 0.1 mm or more preferably contains aggregate (A-1-1) having an average particle size of 0.1 mm or more but less than 0.4 mm and aggregate (A-1-2) having an average particle size of 0.4 mm or more. The aggregate (A-1-1) having an average particle size of 0.1 mm or more but less than 0.4 mm preferably has an average particle size of 0.3 mm or less.

[0024] The mass ratio of aggregate (A-1-1) to aggregate (A-1-2) is preferably in the range of 5-50:50-95, and more preferably in the range of 10-30:70-90, where the total of (A-1-1) and (A-1-2) is 100 parts by mass.

[0025] The mass ratio of aggregate (A-1) to aggregate (A-2) in filler (A), when the total of (A-1) and (A-2) is taken as 100 parts by mass, is preferably in the range of 90 to 95:5 to 10. Furthermore, filler (A) may further contain a curing catalyst for the purpose of curing the reactive curable binder resin (B).

[0026] The reactive curable binder resin (B) may be any resin that can be used as a resin mortar, and from the viewpoint of curability, it may preferably contain a (meth)acrylic resin (i.e., a polymer having a (meth)acryloyl group). The reactive curable binder resin (B) may also contain a curing agent for initiating the curing reaction.

[0027] The viscosity of the reactive curing binder resin (B) measured at 15°C and 20 rpm using a Brookfield viscometer (rotational viscometer) is preferably 1,000 mPa·s or less and 200 mPa·s or more. A viscosity of 1,000 mPa·s or less improves the workability of the mortar, while a viscosity of 200 mPa·s or more reduces dripping.

[0028] The (meth)acrylic resin as the reactive curable binder resin (B) preferably contains one or more components selected from (B-1) a di(meth)acrylate having a bisphenol skeleton, (B-2) a dicyclopentenyloxyalkylene (meth)acrylate, and (B-3) a hydroxyalkyl (meth)acrylate, and more preferably contains (B-1) a di(meth)acrylate having a bisphenol skeleton, (B-2) a dicyclopentenyloxyalkylene (meth)acrylate, and (B-3) a hydroxyalkyl (meth)acrylate. The total amount of (B-1) a di(meth)acrylate having a bisphenol skeleton, (B-2) a dicyclopentenyloxyalkylene (meth)acrylate, and (B-3) a hydroxyalkyl (meth)acrylate is preferably 50 parts by mass or more, more preferably 85 parts by mass or more, and most preferably 95 parts by mass or more, per 100 parts by mass of the reactive curable binder resin (B).

[0029] (B-1) The di(meth)acrylate having a bisphenol skeleton is preferably a di(meth)acrylate represented by the following general formula (A): (B-2) The dicyclopentenyloxyalkylene (meth)acrylate is preferably a dicyclopentenyloxyalkylene (meth)acrylate represented by the following general formula (B): (B-3) The hydroxyalkyl (meth)acrylate is preferably a (meth)acrylate represented by the following general formula (C):

[0030] Formula (A) [ka] (wherein R1 and R1' each independently represent a hydrogen atom or a methyl group, R2 and R2' each independently represent an alkylene group having 1 to 12 carbon atoms, and m and n each independently represent an integer ranging from 1 to 20.)

[0031] Formula (A) [ka] (wherein R3 represents hydrogen or a methyl group, R4 represents an alkylene group having 1 to 12 carbon atoms, and p represents an integer ranging from 1 to 20)

[0032] Formula (C) CH2=CR5-O-(RO) q -H (wherein R5 represents hydrogen or a methyl group, R6 represents an alkylene group having 1 to 12 carbon atoms, and q represents an integer ranging from 1 to 20).

[0033] In the general formula (A) of component (B-1), from the viewpoint of storage stability, it is preferable that R2 and R2' in the general formula (A) are alkylene groups having no hydroxyl groups, and the alkylene groups having no hydroxyl groups are preferably ethylene groups.

[0034] Examples of component (B-1) in which R2 and R2' are alkylene groups not containing a hydroxyl group include polyethylene glycol-modified bisphenol A di(meth)acrylate, polypropylene glycol-modified bisphenol A di(meth)acrylate, 2,2-bis(4-(meth)acryloxydiethoxyphenyl)propane, 2,2-bis(4-(meth)acryloxypropoxyphenyl)propane, and 2,2-bis(4-(meth)acryloxytetraethoxyphenyl)propane. One or more of these can be used. Furthermore, among these, it is preferable that R1 and R1' are protons (hydrogen atoms) in terms of high resin strength. The sum of m + n is preferably 30 or less, more preferably 20 or less, in terms of the resin properties and flame resistance of the cured product. m and n are preferably 1 or more, more preferably 2 or more, in terms of the resin properties and flame resistance of the cured product. Furthermore, it is preferable that m = n, in order to stably express the desired physical properties of the cured product.

[0035] In the general formula (A) of component (B-2), from the viewpoint of storage stability, R4 in the general formula (A) is preferably an alkylene group having no hydroxyl group, and the alkylene group having no hydroxyl group is preferably an ethylene group.

[0036] Examples of component (B-2) in which R4 is an alkylene group not having a hydroxyl group include dicyclopentenyloxyethyl (meth)acrylate, dicyclopentenyloxyethylene glycol (meth)acrylate, dicyclopentenyloxytriethylene glycol (meth)acrylate, and dicyclopentenyloxypropylene glycol (meth)acrylate. Among these, dicyclopentenyloxyethyl (meth)acrylate is preferred in terms of its good surface curing properties and easy availability. R3 in general formula (A) is preferably a methyl group in terms of safety for the human body. p is preferably 1 to 3, more preferably 1, in terms of high resin strength.

[0037] Examples of (B-3) hydroxyalkyl(meth)acrylates include 2-hydroxypropyl(meth)acrylate, 2-hydroxybutyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, and glycerol mono(meth)acrylate. Because component (B-3) has a hydroxyl group, it exhibits the effects of being able to adhere to wet surfaces and being less susceptible to curing inhibition by alkaline compounds such as calcium hydroxide.

[0038] In the general formula (c) of component (B-3), from the viewpoint of storage stability, R6 in the general formula (c) is preferably an alkylene group having no hydroxyl group. As the alkylene group having no hydroxyl group, an ethylene group is preferred. From the viewpoint of safety for the human body, R5 in the general formula (c) is preferably a methyl group. q is preferably 1 to 3, more preferably 1, from the viewpoint of high resin strength.

[0039] Among the components (B-3), 2-hydroxyethyl (meth)acrylate is preferred because it has little odor, and 2-hydroxyethyl methacrylate is more preferred from the standpoint of safety.

[0040] The mass ratio of (B-1) the di(meth)acrylate having a bisphenol skeleton, (B-2) the dicyclopentenyloxyalkylene (meth)acrylate, and (B-3) the hydroxyalkyl (meth)acrylate, when the total of (B-1), (B-2), and (B-3) is taken as 100 parts by mass, is preferably in the range of 10-80:10-80:3-50, more preferably in the range of 30-60:30-60:5-40, and most preferably in the range of 30-50:30-50:10-30.

[0041] The curing agent that can be added to component (B) reacts with the curing catalyst to generate radicals and initiate polymerization of the monomer. Peroxides are preferred as curing agents. Organic peroxides are preferred. Examples of organic peroxides include those classified as ketone peroxides, peroxyketals, hydroperoxides, diallyl peroxides, diacyl peroxides, peroxyesters, peroxydicarbonates, and azo compounds. Specific examples include benzoyl peroxide, dibenzoyl peroxide, dicumyl peroxide, diisopropyl peroxide, di-t-butyl peroxide, t-butyl peroxybenzoate, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-bis(t-butylperoxy)hexyne-3,3-isopropyl hydroperoxide, t-butyl hydroperoxide, dicumyl hydroperoxide, acetyl peroxide, bis(4-t-butylcyclohexyl)peroxydicarbonate, diisopropyl peroxydicarbonate, isobutyl peroxide, 3,3,5-trimethylhexanoyl peroxide, lauryl peroxide, azobisisobutyronitrile, azobiscarbonamide, benzoyl-m-methylbenzoyl peroxide, m-toluoyl peroxide, methyl ethyl ketone peroxide, and cumene hydroperoxide. Among these, at least one organic peroxide selected from the group consisting of benzoyl peroxide, benzoyl-m-methylbenzoyl peroxide, m-toluoyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, and t-butyl peroxybenzoate is preferred. Known inorganic peroxides may also be used.

[0042] The amount of the curing agent used is preferably 0.1 to 20 parts by mass, more preferably 0.5 to 10 parts by mass, and most preferably 1 to 5 parts by mass, relative to 100 parts by mass of the reactive curable binder resin (B).

[0043] The curing catalyst reacts with the curing agent, preferably a peroxide, to generate radicals and promote polymerization of the monomer, and examples of the curing catalyst include diethylthiourea, dibutylthiourea, ethylenethiourea, tetramethylthiourea, acetylthiourea, mercaptobenzimidazole, benzoylthiourea, N,N-diethyl-p-toluidine, N,N-dimethyl-p-toluidine, N,N-diisopropanol-p-toluidine, triethylamine, tripropylamine, ethyldiethanolamine, N,N-dimethylaniline, ethylenediamine, triethanolamine, cobalt naphthenate, copper naphthenate, zinc naphthenate, cobalt octoate, iron octoate, copper neodecanoate, copper acetylacetonate, titanium acetylacetonate, manganese acetylacetonate, chromium acetylacetonate, iron acetylacetonate, vanadyl acetylacetonate, and cobalt acetylacetonate. Among these, metal soaps are preferred because of their excellent surface curability. Examples of metal soaps include cobalt octylate, iron octylate, and copper neodecanoate. Among the metal soaps, cobalt octylate is preferred. Among the cobalt octylates, cobalt 2-ethylhexanoate is preferred.

[0044] The amount of the curing catalyst used is preferably 0.1 to 20 parts by mass, more preferably 0.3 to 10 parts by mass, and most preferably 0.5 to 3 parts by mass, per 100 parts by mass of the filler (A).

[0045] A polymerization inhibitor may be added to the reaction curable binder resin (B) according to the embodiment of the present invention for the purpose of improving long-term storage stability.

[0046] The reaction curable binder resin (B) according to the embodiment of the present invention may contain a silane coupling agent or the like to improve adhesiveness.

[0047] The reactive curable binder resin (B) according to the embodiment of the present invention can further contain paraffin to improve surface curability. The paraffin is preferably paraffin wax. This effect is believed to be due to the action of mitigating the polymerization inhibition caused by oxygen during radical polymerization curing of (meth)acrylate, i.e., the so-called anaerobic condition.

[0048] In the application method according to an embodiment of the present invention, the above components may be mixed by stirring when preparing the mortar-like composition. When using components that are solid at room temperature, such as paraffin wax, the liquid may be heated to a predetermined temperature to dissolve them. The hardening mortar-like composition prepared in this manner can be applied by coating or spraying on the surface of a structure (such as a cement concrete skeleton or asphalt pavement) in the atmosphere, and can be applied to repair defects such as cracks and fractures present on the surface of the structure. The amount of coating or spraying is 0.05 to 5.0 kg / m. 2 is preferable, and 0.1 to 3.0 kg / m 2 In this specification, the term "cement concrete" is a concept that includes any of cement paste, mortar, and concrete. [Example]

[0049] The embodiments of the present invention will be described in detail based on the following Examples 1 to 8 and Comparative Examples 1 to 8. The amount of each substance used is expressed in parts by mass unless otherwise specified. Unless otherwise specified, the experiments were carried out at room temperature.

[0050] (Production of hardenable mortar-like composition) Mortar-like compositions were prepared by stirring and mixing the raw materials shown in Tables 1 and 2 in the compositions shown in Tables 1 and 2, and the properties of the resulting compositions, such as self-flowability, were measured using the methods described below. These results are also shown in Tables 1 and 2. The component (A-1) was quartz (Tohoku Silica No. 4 and Tohoku Silica No. 7 manufactured by Tohoku Silica Co., Ltd.), the component (A-2) was calcium carbonate (Nitto Funka Kogyo Co., Ltd. / NS#400N), the component (B-1) was bisphenol A-type ethylene oxide-modified dimethacrylate (in general formula (A), R1 and R1' are methyl groups, R2 and R2' are ethylene groups, and m and n are 2) (Miwon / Miramer M2101), the component (B-2) was dicyclopentenyloxyethyl methacrylate (Hitachi Chemical Co., Ltd. / DH500), and the component (B-3) was 2-hydroxyethyl methacrylate (Mitsubishi Chemical Corporation / Acryester HO). Cumene hydroperoxide (Trigonox K-80, manufactured by Kayaku Nouryon Co., Ltd.) was used as the organic peroxide, and cobalt 2-ethylhexanoate (CO-12E, manufactured by Tokyo Fine Chemical Co., Ltd.) was used as the curing catalyst that reacts with the organic peroxide.

[0051] Furthermore, Comparative Examples 5 and 6 were replicated as in Examples 6 and 10 of Patent Document 1. Specifically, the following materials were mixed and stirred in the same manner as in Patent Document 1 to prepare a mortar-like composition with the composition shown in Table 3, and the properties were measured in the same manner. Silica sand powder (Tohoku Silica No. 4, manufactured by Tohoku Silica Co., Ltd.) and calcium carbonate (SS30, manufactured by Nitto Funka Kogyo Co., Ltd.) were used as fillers (aggregates). Furthermore, urethane acrylate mixtures (2) and (3) in Table 3 below were prepared as binder resins following the procedures for "Resin (2) containing urethane acrylate" and "Resin (3) containing urethane acrylate" in Synthesis Examples 2 and 3 of Patent Document 1, respectively. The raw materials used were tolylene diisocyanate (Tokyo Chemical Industry Co., Ltd. / T0263), dibutyltin dilaurate (Tokyo Chemical Industry Co., Ltd. / D0303), 2,6-ditertiarybutyl-4-hydroxytoluene (Tokyo Chemical Industry Co., Ltd. / D0228), methyl methacrylate (Mitsubishi Chemical Corporation / Acryester M), polytetramethylene glycol (Mitsubishi Chemical Corporation / PTMG1000), and 2-hydroxyacrylate (Nippon Shokubai Co., Ltd. / BHEA). Other resin raw materials used were methyl methacrylate (same source as above), butyl acrylate (Tokyo Chemical Industry Co., Ltd. / A0142), 2-ethylhexyl methacrylate (Mitsubishi Gas Chemical Company, Inc. / EHMA), 2-ethylhexyl acrylate (Toagosei Co., Ltd. / 2EHA), and triethylene glycol dimethacrylate (Tokyo Chemical Industry Co., Ltd. / T0948), each with the composition shown in Table 3. Dihydroxyethyl-p-toluidine (PT-2HE manufactured by Morin Chemical Industries Co., Ltd.) was used as the curing catalyst, and 50% benzoyl peroxide (Niper FF manufactured by NOF Corporation) was used as the organic peroxide.

[0052] In Tables 1 to 3, the "filler / binder ratio [mass ratio]" indicates the mass ratio within the entire composition obtained. Note that the individual compositions of the aggregate and binder are calculated so that the total is 100 parts by mass, excluding additives, curing catalysts, and organic peroxides, and that although this may appear different from the method used in the tables of Patent Document 1, it has the same meaning.

[0053] Furthermore, Comparative Examples 7 and 8 were replicated as in Examples 19 and 21 of Patent Document 2. Specifically, the following materials were mixed and stirred in the same manner as in Patent Document 2 to prepare a mortar-like composition, with the composition shown in Table 3. The properties were then measured in the same manner. Quartz (Tohoku Silica No. 6, manufactured by Tohoku Silica Co., Ltd.) and glass beads (average particle size 0.045 mm) treated with a silane coupling agent (Potters Ballotini / GB301S) were used as fillers. The binder resins used were methyl methacrylate (same source as above), 1,4-butylene glycol dimethacrylate (Tokyo Chemical Industry Co., Ltd. / T3488), dicyclohexyl phthalate (Tokyo Chemical Industry Co., Ltd. / P0293), and polymethyl methacrylate (Asahi Chemical Industry Co., Ltd. / Delpowder 560F). In addition, paraffin wax (Paraffin Wax-115 manufactured by Nippon Seiro Co., Ltd.) was used as an additive, N,N-dimethyl-p-toluidine (D0807 manufactured by Tokyo Chemical Industry Co., Ltd.) was used as a curing catalyst, and 50% benzoyl peroxide (source is the same as above) was used as an organic peroxide.

[0054] (Method for measuring self-liquidity) The filler and reactive curing binder resin, which had been cured for at least three hours in a 15°C environment, were mixed in a specified ratio (standard 6:1), and measurement was started immediately. The viscosity was measured two minutes after the start of measurement. Measurements were carried out in a 15°C environment in accordance with JIS K 6833-1:2008 using a B-type viscometer. A No. 5 rotor was used. The rotor rotation speed was 20 rpm. The following evaluation criteria were applied. Less than 20,000 mPa·s: Good self-flowability (appropriate) 20,000 mPa·s or more but less than 50,000 mPa·s: Self-flowing (appropriate) 50,000 mPa·s or more: No self-flowability

[0055] (Method for measuring the dynamic friction coefficient) Filler and reactive curing binder resin were mixed at a specified mass ratio (standard is 6:1), and the coating was applied as a thin film and measured using a DF tester manufactured by Nippo Sangyo Co., Ltd. The test specimen was prepared by pouring the curable composition onto a concrete slab to a thickness of 10 mm. The test specimen was left to stand, and after hardening, water was poured onto the surface to measure the wet surface. The test speed was 80 km / h. The evaluation criteria were: good if 0.4 or higher, acceptable if 0.3 or higher but less than 0.4, and unacceptable if less than 0.3. The following are the ranges of dynamic friction coefficients on general road surfaces provided for reference: Concrete pavement: 0.4~0.9 (appropriate) Asphalt pavement: 0.3~0.9 (appropriate) Snowy road surface: 0.2~0.5 Icy road surface: 0.1~0.2

[0056] (Method for measuring filler settling time) Filler that had been cured for more than three hours in a 15°C environment was mixed with a reactive curing binder resin in a specified mass ratio (standard 6:1) and applied to a thickness of 10 mm. The time until the surface filler had settled and was no longer visible was measured at 10-minute intervals until the curing resin was completely cured (120 minutes). The evaluation criteria were that if the filler had not settled by the time curing was complete, it was judged to be good, and if not, it was judged to be bad.

[0057] The results shown in Tables 1 to 3 indicate that all of Examples 1 to 8 exhibited good results in terms of dynamic friction coefficient, self-flowability, and filler settling time. Note that Example 2 is relisted in Table 2 for ease of comparison.

[0058] On the other hand, the aggregate particle size balance was poor in Comparative Example 1, resulting in poor dynamic friction coefficient and filler settling time. Furthermore, in Comparative Example 2, in which aggregate (A-2) was not used, self-flowability was not obtained.

[0059] Comparative Example 3, in which the filler and binder compounding ratio was outside the range of the present invention, was inferior in dynamic friction coefficient and filler settling time, and Comparative Example 4, in which the filler and binder compounding ratio was also outside the range, did not achieve self-flowability.

[0060] Self-fluidity was not obtained in any of Comparative Examples 5 and 6, which are reproductions of the examples in Patent Document 1. This is presumably because the use of fine silica sand powder does not result in a desirable viscosity.

[0061] In Comparative Examples 7 and 8, which are reproductions of the examples in Patent Document 2, no self-flowability was obtained, and the dynamic friction coefficient and filler settling time were also poor. This is presumably because the glass beads have a negative effect on the properties.

[0062] [Table 1] [Table 2] [Table 3] [Industrial Applicability]

[0063] By using a resin mortar that has high fluidity and can be highly filled with filler, the following excellent effects are observed, particularly in repairing structures in the atmosphere, and the industrial applicability of the present invention is great. (1) By using a high concentration of inorganic filler that has little volume change due to temperature changes, cracks on the repair surface can be repaired. It is possible to prevent abnormal occurrences such as cracking and lifting, and improve long-term durability. (2) By increasing the proportion of filler, which is generally cheaper than reactive binders, it is possible to reduce the cost of repair work.

Claims

1. A mortar-like composition having self-flowability, which is obtained by mixing a filler (A) and a reactive curable binder resin (B) in a mass ratio of (A):(B)=2:1 to 10:1, wherein the dynamic friction coefficient of the surface of the composition after curing is 0.3 or more; The filler (A) comprises aggregate (A-1) having an average particle size of 0.1 mm or more and 10 mm or less, and aggregate (A-2) of a type different from the aggregate (A-1) having an average particle size of 0.0001 mm or more and 0.01 mm or less, the mass ratio of the aggregate (A-1) to the aggregate (A-2) is 90 to 95:5 to 10, where the total amount of the aggregate (A-1) and the aggregate (A-2) is 100 parts by mass; The viscosity of the reaction-curable binder resin (B) is 1,000 mPa·s or less and 200 mPa·s or more when measured at 15° C. and 20 rpm using a Brookfield viscometer. A mortar-like composition characterized by:

2. The mortar-like composition according to claim 1, wherein the reaction-curable binder resin (B) contains a (meth)acrylic resin.

3. The filler (A) comprises an aggregate (A-1) having an average particle size of 0.1 mm or more and 5 mm or less, and an aggregate (A-2) having an average particle size of 0.0005 mm or more and 0.01 mm or less. The mortar-like composition according to claim 1 or 2.

4. The mortar-like composition according to any one of claims 1 to 3, characterized in that the aggregate (A-1) and / or the aggregate (A-2) comprises one or more selected from the group consisting of silica sand, talc, calcium carbonate, alumina, fly ash, iron oxide, and titanium oxide.

5. The mortar-like composition according to any one of claims 1 to 4, which is hardenable.

6. A hardened body of the mortar-like composition described in claim 5.

7. A construction method comprising a step of applying the mortar-like composition described in any one of claims 1 to 5 to a structure in the atmosphere.

8. A structure constructed by the construction method described in claim 7.

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