Two-component mortar composition and discharge device

Abstract

To provide a two-component mixed mortar composition having excellent storage stability, consisting of a first liquid containing alumina cement (main material) and a second liquid containing alkali (activator) to initiate the hardening of the alumina cement.SOLUTION: The two-component mixed mortar composition according to this disclosure is used by mixing a first liquid and a second liquid, wherein the first liquid contains alumina cement, and the second liquid is an alkaline solution containing fine aggregate and a cellulose-based thickener.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a two-component mixed mortar composition composed of a first liquid and a second liquid, and to a discharge device that stores these liquids in a separated state and discharges a mixed liquid of these liquids when used. [Background technology]

[0002] Two-component mortar materials are known, which are composed of a base material containing alumina cement and an activator, which is an alkaline solution for initiating the hardening of the alumina cement. For example, Patent Document 1 discloses a two-component mortar fastening material containing a hardenable aqueous phase alumina cement component A and an initiator component B in an aqueous phase for initiating the hardening process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-500297 Summary of the Invention [Problem to be solved by the invention]

[0004] One of the problems of the invention described in Patent Document 1 is that it can be stored stably for a certain period of time before use (see paragraph

[0011] of Patent Document 1). However, according to the investigations of the present inventors, of the two components described in Patent Document 1, the mineral filler contained in initiator component B is prone to settling and aggregation, and there is room for improvement in terms of storage stability.

[0005] The present disclosure provides a two-part mortar composition having excellent storage stability, which is composed of a first part containing alumina cement and a second part containing an alkali for initiating the hardening of the alumina cement. The present disclosure also provides a discharge device that stores the first and second parts separately from each other and discharges a mixture of these parts when used. [Means for solving the problem]

[0006] One aspect of the present disclosure relates to a two-part mortar composition, which is used by mixing a first part and a second part, the first part containing alumina cement and the second part being an alkaline solution containing fine aggregate and a cellulose-based thickener.

[0007] According to evaluation tests conducted by the present inventors, the coexistence of fine aggregate and a cellulose-based thickener in the second liquid significantly inhibits the settling and aggregation of the fine aggregate, achieving excellent storage stability. The main reason for this is not entirely clear, but it is presumed to be due to the fact that the cellulose-based thickener has a higher hydrophilicity than other thickeners.

[0008] Specific examples of the cellulose-based thickener include methylcellulose-based thickeners, hydroxyethylcellulose-based thickeners, hydroxypropylmethylcellulose-based thickeners, and hydroxyethylmethylcellulose-based thickeners. These thickeners may be used alone or in combination of two or more.

[0009] The first liquid may further contain an inhibitor. The coexistence of alumina cement and an inhibitor in the first liquid can prevent the alumina cement from hardening too quickly when the first liquid and the second liquid are mixed. This allows the mixed liquid to maintain fluidity for a certain period of time after the first liquid and the second liquid are mixed.

[0010] The second liquid may further contain inorganic fine powder. By including fine powder such as calcium carbonate or aluminum hydroxide in the second liquid, separation of water from the second liquid can be suppressed and ejection properties can be improved.

[0011] One aspect of the present disclosure relates to a discharge device for the two-component mortar composition. This discharge device includes a first container containing a first liquid containing alumina cement, a second container containing a second liquid, which is an alkaline solution containing fine aggregate and a cellulose-based thickener, a mixing section for mixing the first and second liquids, and a discharge port for discharging the mixture of the first and second liquids. As described above, the second liquid has excellent storage stability. Therefore, the first and second liquids can be easily mixed in the mixing section without the user having to shake or vibrate the entire discharge device in advance, achieving excellent dischargeability.

[0012] In the present disclosure, it is preferable that the first liquid and the second liquid are mixed so as to satisfy the condition expressed by the following inequality (1): In the mixing section of the above-described ejection device according to the present disclosure, the first liquid and the second liquid may be mixed so as to satisfy this condition. 1≦V1 / V2≦10…(1) [In formula (1), V1 represents the volume of the first liquid, and V2 represents the volume of the second liquid.] [Effects of the Invention]

[0013] According to the present disclosure, there is provided a two-part mortar composition having excellent storage stability, which is composed of a first part containing alumina cement and a second part containing an alkali for initiating the hardening of the alumina cement. Also, according to the present disclosure, there is provided a discharge device that contains the first and second parts in a separated state and discharges a mixture of these parts when used. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view that schematically illustrates one embodiment of a discharge device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described in detail, but the present invention is not limited to the following embodiments.

[0016] <Two-component mortar composition> The two-component mortar composition according to this embodiment is used by mixing a first liquid (alumina cement-containing liquid) and a second liquid (alkaline solution). The second liquid contains fine aggregate and a cellulose-based thickener. The coexistence of the fine aggregate and the cellulose-based thickener in the second liquid highly suppresses the settling and aggregation of the fine aggregate in the second liquid, achieving excellent storage stability. The first liquid and the second liquid will be described below.

[0017] [First liquid (alumina cement-containing liquid)] The first liquid contains at least alumina cement and water, and becomes a hydraulic cement mortar (liquid mixture) when mixed with the second liquid.

[0018] Alumina cement is calcium aluminate cement, which is primarily composed of hydraulic calcium aluminate. The main active ingredients of calcium aluminate cement are monocalcium aluminate (CaO·Al2O3) and monocalcium dialuminate (CaO·2Al2O3). An example of a commercially available alumina cement is Turnal White (registered trademark, Imerys Aluminates, France).

[0019] The first liquid may contain, as a binder, calcium sulfate, preferably calcium sulfate hemihydrate, or other gypsums. The calcium aluminate in the alumina cement reacts with the calcium sulfate mixture to form a hydrate called ettringite. The formation of ettringite is known to induce expansion of the hardened composition and compensate for the shrinkage of the alumina cement. The content of the calcium sulfate mixture is preferably 10 to 65 parts by mass, more preferably 15 to 60 parts by mass, and even more preferably 20 to 55 parts by mass per 100 parts by weight of the alumina cement.

[0020] The water is not particularly limited, but examples thereof include tap water, distilled water, deionized water, etc. The water content is preferably 10 to 100 parts by mass, more preferably 20 to 85 parts by mass, and even more preferably 30 to 70 parts by mass, per 100 parts by mass of alumina cement.

[0021] The first liquid may optionally contain a component selected from a suppressor, a blocking agent, an accelerator, and a thickener.

[0022] The inhibitor is a component for delaying the hydration of alumina cement. Examples of inhibitors that can be used include citric acid, tartaric acid, lactic acid, salicylic acid, gluconic acid, and salts thereof. These components may be used alone or in combination. The content of the inhibitor is preferably 0.01 to 1.5 parts by mass, more preferably 0.05 to 1.0 part by mass, and even more preferably 0.1 to 0.6 parts by mass, per 100 parts by mass of alumina cement.

[0023] The accelerator is a component that accelerates the hardening of alumina cement. The hardening time of cement mortar can be adjusted by using an accelerator and an inhibitor in combination as needed. Examples of accelerators that can be used include lithium metal salts such as lithium sulfate, lithium formate, lithium nitrite, lithium phosphate, and lithium carbonate; sodium metal salts such as sodium sulfate, sodium formate, sodium nitrite, sodium phosphate, and sodium carbonate; and calcium metal salts such as calcium sulfate, calcium formate, calcium nitrite, and calcium phosphate. One of these components may be used alone, or two or more may be used in combination. The content of the accelerator is preferably 0.01 to 15.0 parts by mass, more preferably 0.05 to 10.0 parts by mass, and even more preferably 0.1 to 5.0 parts by mass, per 100 parts by mass of alumina cement.

[0024] The blocking agent is a component for preventing hydration of alumina cement in the first liquid. Examples of blocking agents that can be used include phosphoric acid, metaphosphoric acid, phosphorous acid, and phosphonic acid. These components may be used alone or in combination. The content of the blocking agent is preferably 0.3 to 6.0 parts by mass, more preferably 0.5 to 5.0 parts by mass, and even more preferably 1.0 to 4.0 parts by mass, per 100 parts by mass of alumina cement.

[0025] The thickener is a component for adjusting the viscosity of the first liquid. Examples of thickeners that can be used include xanthan gum, diutan gum, starch ether, guar gum, polyacrylamide, carrageenan gum, agar, clay mineral-based bentonite, cellulose-based, protein-based, latex-based, and water-soluble polymer-based thickeners. One of these may be used alone, or two or more may be used in combination. The content of the thickener is preferably 0.01 to 1.6 parts by mass, more preferably 0.03 to 1.2 parts by mass, and even more preferably 0.05 to 0.8 parts by mass, per 100 parts by mass of alumina cement.

[0026] In addition to the above components, the first liquid may contain fine aggregate, a fluidizing agent, ink, pigment, dispersant, setting modifier, expansion agent, shrinkage reducing agent, antifoaming agent, preservative, etc.

[0027] The fine aggregate is not particularly limited, and examples include river sand, land sand, sea sand, crushed sand, silica sand, hard blast furnace slag fine aggregate, blast furnace slag fine aggregate, copper slag fine aggregate, and electric furnace oxidized slag fine aggregate. These may be used alone or in combination. As defined in JIS A 0203:2014 "Concrete Terminology," fine aggregate is defined as aggregate that passes entirely through a 10 mm mesh sieve and at least 85% by mass through a 5 mm mesh sieve. The maximum particle size of the fine aggregate is preferably 0.4 mm, more preferably 0.35 mm, and even more preferably 0.3 mm. To suppress settling and aggregation of the fine aggregate in the second liquid, it is preferable to use fine aggregate with a small average particle size. Specific examples include No. 7 silica sand (maximum particle size: approximately 0.3 mm) and No. 8 silica sand (maximum particle size: approximately 0.25 mm). The content of the fine aggregate in the first liquid is preferably 5 to 100 parts by mass, more preferably 15 to 90 parts by mass, and even more preferably 35 to 80 parts by mass, relative to 100 parts by mass of alumina cement.

[0028] The viscosity range of the first liquid during use is preferably 30 to 200 Pa·s, more preferably 35 to 160 Pa·s, and even more preferably 45 to 140 Pa·s. The Ti value (thixotropy index) of the first liquid during use is preferably 1.5 to 9.5, more preferably 2.0 to 8.5, and even more preferably 2.5 to 8.0. The viscosity of the first liquid refers to a value measured using a Brookfield viscometer at 20°C and a rotation speed of 20 rpm, and the Ti value refers to the ratio of the viscosity at 2 rpm to the viscosity at 20 rpm. A first liquid having a viscosity and Ti value within the above ranges can be said to sufficiently suppress solid-liquid separation during storage. Such a first liquid can be used in the discharge device according to this embodiment, resulting in low discharge resistance and material properties that allow continuous discharge during discharge.

[0029] The storage stability of the first liquid can be evaluated by the rate of viscosity change. The rate of viscosity change is a value calculated by the following formula (2) from the viscosity v0 immediately after preparation (within one hour after preparation) and the viscosity v7 one week (seven days) after preparation. Note that both viscosities v0 and v7 refer to values measured using a Brookfield viscometer at a rotation speed of 20 rpm. If the rate of viscosity change is in the range of -30% to 30% (more preferably -20 to 20%), it can be determined that the first liquid has sufficiently high storage stability. Viscosity change rate [%] = (v7 - v0) / v0 × 100…(2)

[0030] [Second liquid (alkaline solution)] The second liquid is a solution containing an activator, fine aggregate, and a cellulose-based thickener. The activator may be, for example, a solution containing sodium hydroxide, an amine, an alkanolamine, sodium orthosilicate, lithium hydroxide, aminomethylpropanol, calcium hydroxide, or the like. The inclusion of the activator makes the second liquid an alkaline solution. The pH of the second liquid is greater than 7 and less than or equal to 14, preferably 9 to 14. Mixing the second liquid with the first liquid can initiate hardening of the alumina cement contained in the first liquid.

[0031] The fine aggregate is not particularly limited, and examples include river sand, land sand, sea sand, crushed sand, silica sand, hard blast furnace slag fine aggregate, blast furnace slag fine aggregate, copper slag fine aggregate, and electric furnace oxidized slag fine aggregate. These may be used alone or in combination. As defined in JIS A 0203:2014 "Concrete Terminology," fine aggregate is defined as aggregate that passes entirely through a 10 mm mesh sieve and at least 85% by mass through a 5 mm mesh sieve. The maximum particle size of the fine aggregate is preferably 0.4 mm, more preferably 0.35 mm, and even more preferably 0.3 mm. To suppress settling and aggregation of the fine aggregate in the second liquid, it is preferable to use fine aggregate with a small average particle size. Specific examples include No. 7 silica sand (maximum particle size: approximately 0.3 mm) and No. 8 silica sand (maximum particle size: approximately 0.25 mm). The content of the fine aggregate in the second liquid is preferably 60 to 300 parts by mass, more preferably 80 to 280 parts by mass, and even more preferably 100 to 250 parts by mass, relative to 100 parts by mass of the activator.

[0032] The cellulose-based thickener is a component that adjusts the viscosity of the second liquid and inhibits settling and aggregation of fine aggregate. The inclusion of a cellulose-based thickener in the second liquid can achieve excellent storage stability. Specific examples of cellulose-based thickeners include methylcellulose-based thickeners, hydroxyethylcellulose-based thickeners, hydroxypropylmethylcellulose-based thickeners, and hydroxyethylmethylcellulose-based thickeners. One of these may be used alone, or two or more may be used in combination.

[0033] The content of the cellulose-based thickener in the second liquid is preferably 0.05 to 10.0 parts by mass, more preferably 0.1 to 8.0 parts by mass, and even more preferably 0.2 to 5.0 parts by mass, per 100 parts by mass of the activator. If this amount is less than 0.05 parts by mass, sedimentation and aggregation of the fine aggregate will occur easily, while if it is more than 10.0 parts by mass, the viscosity of the second liquid will become excessively high, resulting in a loss of fluidity.

[0034] The viscosity of the cellulose-based thickener is expressed as the viscosity value of a 2% aqueous solution at 20°C using a Brookfield viscometer. The viscosity of a 2% aqueous solution of the cellulose-based thickener used in the second liquid at 20°C is preferably 50 mPa·s to 12,000 mPa·s, more preferably 300 mPa·s to 11,000 mPa·s, and even more preferably 3,000 mPa·s to 10,000 mPa·s. When the viscosity of a 2% aqueous solution of the cellulose-based thickener at 20°C is within the range of 50 mPa·s to 12,000 mPa·s, it becomes possible to design a mortar composition without adding an extremely large or small amount of cellulose-based thickener.

[0035] The second liquid may further contain an inorganic fine powder (also referred to as a filler). The inorganic fine powder has a particle size smaller than that of the fine aggregate and serves to suppress separation of water from the second liquid and improve dischargeability. Examples of inorganic fine powders that can be used include calcium carbonate and aluminum hydroxide. The inorganic fine powder has an average particle size of, for example, 1 to 2 μm, and may be 0.5 to 2.5 μm. The average particle size of the inorganic fine powder refers to a value measured using a laser diffraction particle size distribution analyzer. The content of the inorganic fine powder in the second liquid is preferably 5 to 250 parts by mass, more preferably 15 to 200 parts by mass, and even more preferably 25 to 150 parts by mass, per 100 parts by mass of the activator. When this amount is 5 parts by mass or more, the above-mentioned effects of the inorganic fine powder tend to be fully exerted, while when it is 250 parts by mass or less, the second liquid tends to be maintained in a stable slurry state.

[0036] In addition to the above components, the second liquid may contain ink, pigment, antifoaming agent, preservative, etc.

[0037] The viscosity range of the second liquid during use is preferably 30 to 200 Pa·s, more preferably 35 to 160 Pa·s, and even more preferably 45 to 140 Pa·s. The Ti value (thixotropy index) of the second liquid during use is preferably 1.5 to 9.5, more preferably 2.0 to 8.5, and even more preferably 2.5 to 8.0. The viscosity of the second liquid is measured using a Brookfield viscometer at 20°C and a rotation speed of 20 rpm, and the Ti value refers to the ratio of the viscosity at 2 rpm to the viscosity at 20 rpm. A second liquid having a viscosity and Ti value within the above ranges can be said to sufficiently suppress solid-liquid separation during storage. Such a second liquid can be used in the discharge device according to this embodiment, providing material properties such as low discharge resistance and continuous discharge.

[0038] The storage stability of the second liquid can be evaluated, as with the first liquid, by the viscosity change rate calculated by the above formula (2). If the viscosity change rate is in the range of -30% to 30% (more preferably -20 to 20%), it can be determined that the second liquid has sufficiently high storage stability.

[0039] [Cement mortar] Cement mortar is obtained by mixing the first liquid and the second liquid. It is preferable that the first liquid and the second liquid are mixed so as to satisfy the condition expressed by the following inequality (1). 1≦V1 / V2≦10…(1) [In formula (1), V1 represents the volume of the first liquid, and V2 represents the volume of the second liquid.] When the value of V1 / V2 is 1 or more, a hardened mortar with high hardness can be obtained from the cement mortar, while when it is 10 or less, the first liquid and the second liquid can be mixed sufficiently uniformly in a short time. This value is more preferably 1.2 to 6.0, and even more preferably 1.4 to 4.0.

[0040] The cement mortar obtained by mixing the first liquid and the second liquid, whose viscosity and Ti value are within the aforementioned ranges, has low discharge resistance in the discharge device according to this embodiment, is discharged continuously, and has material properties that prevent dripping even when applied sideways or upwards.

[0041] [Discharge device] FIG. 1 is a cross-sectional view schematically illustrating a discharge device according to this embodiment. The discharge device 10 shown in this figure utilizes hydraulic cement mortar as a filler material. The discharge device 10 includes a first container 1 containing a first liquid, a second container 2 containing a second liquid, a mixer 3 for mixing these liquids, a nozzle 7 provided at the outlet of the mixer 3, and a container body 8. The first container 1 and the second container 2 are detachably attached to the container body 8. The first liquid and the second liquid are mixed in the mixer 3 to prepare cement mortar, which is then discharged from the nozzle 7. The discharge device 10 discharges cement mortar at a rate of, for example, about 0.01 to 10 L / min per unit time.

[0042] The discharge device 10 is applied to a post-installed anchor method, and specifically, is used in the process of injecting cement mortar into a hole. The post-installed anchor method includes the following steps. (A) Drill holes in designated locations in an existing building. (B) Clean the inner surface of the hole. (C) Check the hole depth. (D) A predetermined amount of cement mortar is poured into the hole. (E) Embed the anchor bars into the holes filled with cement mortar. (F) Allow the cement mortar to harden and fix the anchor bars in place. In the post-installed anchor method, in order to construct an anchor with sufficient strength, it is important to form a hole of a specified depth and to reliably inject a specified amount of cement mortar into this hole.

[0043] The discharge device 10 includes a first transfer means for transferring the first liquid in the first container 1 to the mixer 3, and a second transfer means for transferring the second liquid in the second container 2 to the mixer 3. In this embodiment, the first transfer means includes a first piston 1a that slides against the inner surface of the first container 1 and a flow path 1d provided in the tip 1c of the first container 1. In this embodiment, the second transfer means includes a second piston 2a that slides against the inner surface of the second container 2 and a flow path 2d provided in the tip 2c of the second container 2. The tip 1c of the first container 1 and the tip 2c of the second container 2 are detachably connected to the mixer 3. Instead of this configuration, the first and second containers 1 and 2 may be connected to the mixer 3 via hoses (not shown).

[0044] The first piston 1a is configured to be driven manually, electrically, hydraulically, or by air (plunger) to adjust the amount of the first liquid transferred to the mixer 3. The second piston 2a is configured to be driven manually, electrically, hydraulically, or by air (plunger) to adjust the amount of the second liquid transferred to the mixer 3. The first piston 1a and the second piston 2a may be configured with a single shaft (shaft 1b and shaft 2b are integrally formed) or with two shafts (shaft 1b and shaft 2b are formed independently of each other). In the case of a single shaft configuration, the first piston 1a and the second piston 2a have the same travel distance, and therefore the blending ratio of the two liquids is determined by the cross-sectional areas of the first container 1 and the second container 2. On the other hand, in the case of a dual shaft configuration, the blending ratio of the two liquids can be set arbitrarily by independently controlling both pistons.

[0045] Each component of the discharge device 10 will be described below.

[0046] The first container 1 contains a first liquid. The second container 2 contains a second liquid. The first container 1 and the second container 2 are detachably attached to the container body 8. Therefore, the first liquid and the second liquid can be prepared in a well-equipped manufacturing factory, and other first containers 1 and second containers 2 containing these liquids can be delivered to the construction site, making it easy to replace the first container 1 and second container 2 when they are low in liquid. The first container 1 and second container 2 may be separable or integrated.

[0047] The capacities of the first container 1 and the second container 2 may be appropriately set depending on the amounts of the first liquid and the second liquid to be contained in these containers. When the amount of the second liquid used to prepare the cement mortar is 1 part by volume, the amount of the first liquid to be used is, for example, 1 to 10 parts by volume (see the above inequality (1)).

[0048] The mixer 3 is, for example, a static mixer. A static mixer does not require power and is space- and energy-saving. The mixer 3 may be any device that can mix the first liquid and the second liquid sufficiently uniformly, and may be, for example, a device that includes a tank that contains these liquids and a propeller that stirs the liquids in the tank.

[0049] The nozzle 7 is used to discharge cement mortar and is detachably attached to the tip of the mixer 3. The shape of the discharge port 7a of the nozzle 7 may be appropriately determined depending on the viscosity and discharge speed of the cement mortar, the shape of the filling hole, and other factors. As described above, in the post-installed anchor method, it is important to reliably inject a predetermined amount of cement mortar into the hole. Therefore, for example, it is preferable to supply the cement mortar to the bottom of the hole so that no voids are formed in the hole when the cement mortar is filled. That is, it is preferable to insert the nozzle 7 into the hole and supply the cement mortar into the hole with the discharge port 7a of the nozzle 7 close to the bottom of the hole. The nozzle 7 has an elongated shape, for example, as shown in FIG. 1. The length of the nozzle 7 is, for example, 30 to 450 mm, preferably 45 to 420 mm. The outer diameter of the nozzle 7 is, for example, 3 to 65 mm, preferably 7 to 60 mm. [Example]

[0050] The present disclosure will be described in further detail below based on specific examples, but the present invention is not limited to the following examples and can be implemented with appropriate modifications within the scope that does not change the gist of the present disclosure.

[0051] <Materials used> The following materials were prepared: [1] Materials for preparing the first liquid (alumina cement-containing liquid) (1) Binding material Alumina cement (trade name: Ternal White, manufactured by Imerys, Al2O3: 68.7%) Hemihydrate gypsum (product name: MB12RG, manufactured by Imerys) (2) Thickener Thickener 1A: Gum-based thickener (trade name: Kelco vis DG, manufactured by KELCO) Thickener 2A: Cellulose-based thickener (product name: Metrose SC-3403Q, manufactured by Shin-Etsu Chemical Co., Ltd.) (3) Fine aggregate No. 7 silica sand (product name: N70 silica sand, manufactured by Hyōya Co., Ltd., maximum particle size: 290 μm) No. 8 silica sand (product name: N80 silica sand, manufactured by Hyōya Co., Ltd., maximum particle size: 240 μm) (4) Other ·water Inhibitor: Sodium tartrate (trade name: Sodium L-tartrate, manufactured by Fuso Chemical Co., Ltd.) Blocking agent: Phosphoric acid (concentration: 85wt%) Accelerator: Lithium sulfate (trade name: Peramin AXL80 (Peramin is a registered trademark), manufactured by Peramin Co., Ltd.) Superplasticizer: Polyacrylic acid superplasticizer (Sokalan PA25CL-FR (Sokalan is a registered trademark), manufactured by BASF) [2] Materials for preparing the second liquid (alkaline solution) (1) Activator Sodium hydroxide solution (concentration: 5 wt%) 2-Amino-2-methyl-1-propanol (trade name: AMP-90, manufactured by ANGUS) (2) Fine aggregate No. 7 silica sand (product name: N70 silica sand, manufactured by Hyōya Co., Ltd., maximum particle size: 290 μm) No. 8 silica sand (product name: N80 silica sand, manufactured by Hyōya Co., Ltd., maximum particle size: 240 μm) (3) Filler (inorganic fine powder) Aluminum hydroxide powder (average particle size: 1.64 μm) Calcium carbonate powder (average particle size: 1.21 μm) (4) Thickener Thickener 1B: Hydroxypropyl methylcellulose (HPMC, trade name: Metrose SC-3403Q, manufactured by Shin-Etsu Chemical Co., Ltd.) Thickener 2B: Hydroxypropyl methylcellulose (HPMC, trade name: Metrose SH-4000, manufactured by Shin-Etsu Chemical Co., Ltd.) Thickener 3B: Hydroxyethyl methylcellulose (HEMC, trade name: Metrose SEB-04T, manufactured by Shin-Etsu Chemical Co., Ltd.) Thickener 4B: Methylcellulose (MC, trade name: Metrose SM-4000, manufactured by Shin-Etsu Chemical Co., Ltd.) Thickener 5B: Gum-based thickener (product name: KELZAN, manufactured by KELCO) Thickener 6B: Mineral thickener (product name: LAPONITE EP, manufactured by BYK) (5) Admixture Antifoaming agent: Non-ionic antifoaming agent (trade name: Adekanate B317F, manufactured by ADEKA Corporation)

[0052] Table 1 shows the composition of the first liquid according to the examples. Table 2 shows the composition of the second liquid according to the examples and comparative examples. The units of values listed in Table 1 are parts by mass (based on 100 parts by mass of alumina cement). The units of values listed in Table 2 are parts by mass (based on 100 parts by mass of activator).

[0053] [Table 1]

[0054] [Table 2]

[0055] [evaluation] (1) Evaluation of storage stability The viscosity change rate calculated by the above formula (2) was determined for the first liquid having the composition shown in Table 1 and the second liquid shown in Table 2. A B-type viscometer (manufactured by Brookfield) was used to measure the viscosity at a rotation speed of 20 rpm. The curing temperature for the first and second liquids was 20°C. The results are shown in Tables 3 and 4. Table 3 also lists the blend amounts (unit: parts by mass) of water and fine aggregate based on the amount of alumina cement (100 parts by mass). Table 4 also lists the blend amounts (unit: parts by mass) of filler and thickener based on the total amount of activator (100 parts by mass).

[0056] [Table 3]

[0057] [Table 4] In the second liquids of Comparative Examples 1B and 2B, separation of water and settling of fine aggregate were observed 24 hours after preparation, and viscosity v7 could not be measured.

[0058] To evaluate the thixotropy of the second liquid, a Brookfield viscometer was used to measure the viscosity of the second liquid at a rotation speed of 2 rpm. The results are shown in Table 5. The Ti value in the table refers to the "thixotropy index" and is the ratio of the viscosity at a rotation speed of 2 rpm to the viscosity at a rotation speed of 20 rpm. The Ti value change rate in the table is calculated using the following formula (3) from the Ti value (Ti0) immediately after preparation (within 1 hour of preparation) and the Ti value (Ti7) one week (7 days) after preparation. Ti value change rate [%] = (Ti7 - Ti0) / Ti0 × 100…(3)

[0059] [Table 5]

[0060] According to the studies of the present inventors, if the rate of change in Ti value is in the range of -20 to 50% (more preferably -20 to 20%), it can be determined that the film has sufficiently stable thixotropy.

[0061] (2) Evaluation of the ejection properties of cement mortar and the pull-out strength of anchor bars First, a two-liquid mixing injection gun was prepared. Cartridges containing a first liquid and a second liquid were attached to this injection gun. The first storage section (capacity: 300 ml) of the cartridge was filled with the first liquid, and the second storage section (capacity: 150 ml) was filled with the second liquid. A nozzle was attached to the opening of the cartridge, and the first and second liquids were mixed inside the nozzle, and cement mortar was ejected from the tip of the nozzle. The mixing ratio of the first liquid to the second liquid was 2:1. Table 6 shows the composition of the cement mortar for each test example.

[0062] The anchor bars were fixed in the holes as follows: The base material had Fc=23.1N / mm 2The concrete blocks were prepared as follows. First, a hole (diameter: 20 mm, depth: 100 mm) was drilled in the concrete block. Approximately 19 to 25 mL of cement mortar was filled into the hole using the injection gun, and then an anchor bar (diameter: 16 mm) was embedded in the hole. The cement mortar in the hole was allowed to harden, fixing the anchor bar in place. When filling the hole with cement mortar, if approximately 19 to 25 mL of cement mortar could be continuously dispensed from the nozzle tip, the dispenseability was evaluated as "good." On the other hand, if continuous dispensing was not possible, the dispenseability was evaluated as "poor." The pull-out strength of the anchor bar was measured at 1 day and 7 days of age. The pull-out strength was calculated as the average bond strength per unit area calculated from the bolt outer diameter and embedment length. The results are shown in Table 6.

[0063] [Table 6] [Explanation of symbols]

[0064] 1...first container, 2...second container, 3...mixer (mixing section), 7...nozzle, 7a...discharge port, 8...container main body, 10...discharge device.

Claims

1. A two-component mortar composition used by mixing a first liquid and a second liquid, The first liquid contains alumina cement, an accelerator that accelerates the hardening of the alumina cement, a blocking agent that prevents the hydration of the alumina cement, an inhibitor that delays the hydration of the alumina cement, and water, The content of the accelerator is 0.01 to 15.0 parts by mass per 100 parts by mass of the alumina cement, The content of the blocking agent is 0.3 to 6.0 parts by mass per 100 parts by mass of the alumina cement, the second liquid is an alkaline solution containing fine aggregate and a cellulose-based thickener, A two-component mortar composition, wherein the second component does not contain an accelerator that accelerates the hardening of the alumina cement.

2. The two-component mortar composition according to claim 1, wherein the cellulose-based thickener is at least one selected from the group consisting of a methylcellulose-based thickener, a hydroxypropylmethylcellulose-based thickener, and a hydroxyethylmethylcellulose-based thickener.

3. The two-component mortar composition according to claim 1 or 2, wherein the second liquid further contains an inorganic fine powder.

4. The two-component mortar composition according to any one of claims 1 to 3, wherein the accelerator is lithium sulfate.

5. The two-component mixed mortar composition according to any one of claims 1 to 4, which is used for a post-installed anchor method.

6. a first container containing a first liquid containing alumina cement, an accelerator that accelerates the hardening of the alumina cement, a blocking agent that prevents the hydration of the alumina cement, an inhibitor that delays the hydration of the alumina cement, and water; a second container containing a second liquid, which is an alkaline solution containing fine aggregate and a cellulose-based thickener; a mixing unit that mixes the first liquid and the second liquid; a discharge port for discharging a mixture of the first liquid and the second liquid; Equipped with The content of the accelerator is 0.01 to 15.0 parts by mass per 100 parts by mass of the alumina cement, The content of the blocking agent is 0.3 to 6.0 parts by mass per 100 parts by mass of the alumina cement, A discharge device in which the second liquid does not contain an accelerator that accelerates the hardening of the alumina cement.

7. The discharge device according to claim 6 , wherein the first liquid and the second liquid are mixed in the mixing section so as to satisfy the condition expressed by the following inequality (1): 1≦V1 / V2≦10 (1) [In formula (1), V1 represents the volume of the first liquid, and V2 represents the volume of the second liquid.]

8. 8. A discharge device according to claim 6 or 7, wherein the accelerator is lithium sulfate.

9. The discharge device according to any one of claims 6 to 8, which is for a post-installed anchor method.

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