Laminate manufacturing system, laminate manufacturing method, and cured product manufacturing method

Abstract

To provide a laminate manufacturing system that can stably and continuously form laminates while using a mixed slurry with excellent strength development properties. [Solution] A laminate manufacturing system is provided, comprising: a first supply unit that supplies a main material slurry containing a first hydraulic binder and water; a second supply unit that supplies a curing initiator slurry containing a second hydraulic binder, alum, and water; a dynamic mixer that combines and mixes the main material slurry and the curing initiator slurry to obtain a mixed slurry; and a discharge unit that discharges the mixed slurry to obtain a laminate, wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder.

Description

[Technical Field]

[0001] This disclosure relates to a manufacturing system for laminates, a method for manufacturing laminates, and a method for manufacturing cured products. [Background technology]

[0002] Additive manufacturing is a known method that involves layering materials such as resin, metal, and ceramics based on three-dimensional data of the target object. Among additive manufacturing methods, a material extrusion method is known in which the material is extruded from the nozzle of a 3D printer and layered. As for the material, a two-component mixture type, consisting of a main component and a hardening agent, is known. For example, Patent Document 1 proposes a system in which the main component and hardening agent are provided separately, with the main component containing a hydraulic binder and a retarder, and the hardening agent containing alum and a basic aluminum salt. Patent Document 2 proposes a construction system comprising a mixing unit that combines and mixes a main component slurry and a hardening initiator slurry to obtain a mixed slurry, and a dispensing unit that discharges the mixed slurry. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-98085 [Patent Document 2] Japanese Patent Publication No. 2024-93922 [Overview of the project] [Problems that the invention aims to solve]

[0004] The static mixer used in the construction system described in Patent Document 2 is highly convenient because it does not require power and can continuously discharge mixed slurry. On the other hand, if the amount of curing accelerator is increased to accelerate the hardening of the molded object, there is a concern that the fluidity of the mixed slurry will decrease, resulting in insufficient mixing, or that the discharge pressure of the pump will increase. For this reason, in the case of a static mixer, there may be limitations in the selection of the composition of the main material slurry and the curing initiator slurry. Therefore, this disclosure provides a laminate manufacturing system and a laminate manufacturing method that can stably and continuously form a laminate while using a mixed slurry with excellent strength development. Furthermore, it provides a curing method that can produce a cured product with high compressive strength using a laminate obtained by such a laminate manufacturing system or laminate manufacturing method. [Means for solving the problem]

[0005] One aspect of this disclosure provides a laminate manufacturing system comprising: a first supply unit for supplying a main material slurry containing a first hydraulic binder and water; a second supply unit for supplying a curing initiator slurry containing a second hydraulic binder, alum, and water; a dynamic mixer for combining and mixing the main material slurry and the curing initiator slurry to obtain a mixed slurry; and a discharge unit for discharging the mixed slurry to obtain a laminate, wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more with respect to a total of 100 parts by mass of the first hydraulic binder and the second hydraulic binder.

[0006] The above-described laminate manufacturing system includes a dynamic mixer that combines and mixes the main material slurry and the curing initiator slurry to obtain a mixed slurry. By including such a dynamic mixer, even if the content of alum, which affects the initial fluidity of the mixed slurry among the curing accelerators, is high, the main material slurry and the curing initiator slurry can be sufficiently mixed. This suppresses variations in the composition of the mixed slurry and effectively prevents increases in pump discharge pressure and blockages. Therefore, the above-described laminate manufacturing system enables the stable and continuous production of laminates.

[0007] One aspect of this disclosure provides a method for manufacturing a laminate, comprising: a first supply step of supplying a main material slurry containing a first hydraulic binder and water; a second supply step of supplying a curing initiator slurry containing a second hydraulic binder, alum, and water; a mixing step of combining the main material slurry and the curing initiator slurry and mixing them in a dynamic mixer to obtain a mixed slurry; and a lamination step of discharging the mixed slurry to obtain a laminate, wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more with respect to a total of 100 parts by mass of the first hydraulic binder and the second hydraulic binder.

[0008] The above-described method for manufacturing the laminate includes a mixing step in which a main material slurry and a curing initiator slurry are combined and mixed in a dynamic mixer to obtain a mixed slurry. By having such a mixing step before the lamination step, even if the content of alum, which affects the initial fluidity of the mixed slurry among the curing accelerators, is high, the main material slurry and the curing initiator slurry can be sufficiently mixed. This suppresses variations in the composition of the mixed slurry and sufficiently suppresses increases in pump discharge pressure and the occurrence of blockage. Therefore, the above-described method for manufacturing the laminate allows for the stable and continuous production of laminates.

[0009] One aspect of this disclosure is the provision of a method for producing a cured product, which includes a manufacturing system for the laminate described above, or a curing step for curing the laminate obtained by the manufacturing method for the laminate described above to obtain a cured product. The method for producing a cured product includes a curing step for curing the laminate obtained by the manufacturing system for the laminate or the manufacturing method for the laminate, which is capable of stable and continuous operation while using a mixed slurry that exhibits excellent strength development. Therefore, a cured product with high compressive strength can be produced. [Effects of the Invention]

[0010] In the present disclosure, it is possible to provide a laminate manufacturing system and a laminate manufacturing method capable of stably and continuously forming a laminate while using a mixed slurry excellent in strength expressivity. Further, it is possible to provide a cured product manufacturing method capable of manufacturing a cured product having high compressive strength using the laminate obtained by such a laminate manufacturing system or laminate manufacturing method.

Brief Description of Drawings

[0011] [Figure 1] It is a figure which shows the manufacturing system of the laminated body which concerns on one Embodiment. [Figure 2] It is a figure which shows an example of a dynamic mixer. [Figure 3] It is a figure which shows a state where silica fume is adsorbed on cement. [Figure 4] It is a photograph of the laminate manufactured in Example 1. [Figure 5] It is a table which summarizes the content of Table 3 and Table 4.

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present disclosure will be described. However, the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following contents. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant descriptions may be omitted as appropriate. Also, the positional relationships such as up, down, left, and right are based on the positional relationships based on the directions of the reference numerals shown in the drawings unless otherwise specified. The dimensional ratios of each element are not limited to the ratios shown in the drawings. The numerical range exemplified by "a to b" has a lower limit of a and an upper limit of b, and is a numerical range including a and b. A numerical range in which the upper limit or the lower limit of each numerical range is replaced with the numerical value of any embodiment is also included in the present disclosure. When a plurality of materials are exemplified, one of them may be used alone, or a plurality of them may be used in combination.

[0013] The "laminated body" in the present disclosure is formed by laminating a fluid mixed slurry, and includes both the one immediately after lamination and the one after complete curing. On the other hand, the "cured product" in the present disclosure refers to the one in which the mixed slurry is discharged and curing progresses, and the compressive strength measured in accordance with JIS A 1108:2018 "Method of Test for Compressive Strength of Concrete" is 5 N / mm or more. That is, the one immediately after lamination corresponds to the laminated body but does not correspond to the cured product. Thereafter, the one in which curing progresses and reaches the above compressive strength corresponds to both the laminated body and the cured product. The hydraulic binder in the present disclosure refers to a material having the property of reacting with water and curing.

[0014] The manufacturing system 100 of the laminated body in FIG. 1 includes a first supply unit 10 that supplies a main material slurry containing a first hydraulic binder and water, a second supply unit 20 that supplies a curing start material slurry containing a second hydraulic binder, alum, and water, a dynamic mixer 40 that combines and mixes the main material slurry and the curing start material slurry to obtain a mixed slurry, a discharge unit 60 that discharges the mixed slurry to obtain a laminated body, and a position adjustment unit 70 that adjusts the discharge position of the mixed slurry from the discharge unit 60.

[0015] The first supply unit 10 includes a first storage unit 12 that stores the main material slurry and a first liquid delivery pump 14. The second supply unit 20 includes a second storage unit 22 that stores the curing start material slurry and a second liquid delivery pump 24. The first storage unit 12 and the second storage unit 22 may be transportable containers, tank lorries, or tanks installed on the ground. The first storage unit 12 and the first liquid delivery pump 14, and the first liquid delivery pump 14 and the dynamic mixer 40 may be connected by a flow path such as a pipe. The second storage unit 22 and the second liquid delivery pump 24, and the second liquid delivery pump 24 and the dynamic mixer 40 may be connected by a flow path such as a pipe.

[0016] Various types of pumps can be used as the first liquid delivery pump 14 and the second liquid delivery pump 24. Of these, the first liquid delivery pump 14 and the second liquid delivery pump 24 may be pulsation-free pumps or pulsation-free metering pumps. This makes it possible to stably maintain a constant mixing ratio between the main material slurry and the curing initiator slurry.

[0017] The dynamic mixer 40, also known as a dynamic mixer, combines and mixes the main material slurry and the curing initiator slurry. Because the dynamic mixer 40 continuously combines and mixes the main material slurry and the curing initiator slurry, it can continuously prepare the mixed slurry. Since the dynamic mixer 40 uses a power source to drive mixing elements such as agitators, it can perform more powerful stirring than a static mixer that does not use a power source. Therefore, even mixed slurries with excellent strength development properties can be sufficiently stirred. Consequently, variations in the composition of the mixed slurry are reduced, and increases in the discharge pressure of the first liquid transfer pump 14 and the second liquid transfer pump 24, as well as blockages in the piping and within the dynamic mixer 40, can be sufficiently suppressed.

[0018] The structure of the dynamic mixer 40 is not particularly limited and may have a power source and a mixing element driven by it. The power source may be, for example, a motor. Examples of mixing elements include a rotor equipped with blades or an impeller, and a stator.

[0019] Figure 2 shows an example of a dynamic mixer 40. The dynamic mixer 40A in Figure 2 comprises a motor M which is a power source, a rotor 44 which is rotationally driven by the motor M, a housing 45 which houses the rotor 44, a first inlet 41 for introducing the main material slurry S1 into the housing 45, a second inlet 42 for introducing the curing initiator slurry S2 into the housing 45, and an outlet 48 for discharging the mixed slurry S3 prepared inside the housing 45 from inside the housing 45.

[0020] The main material slurry S1 discharged from the first liquid delivery pump 14 in Figure 1 is introduced into the housing 45 through the first inlet 41. The curing initiator slurry S2 discharged from the second liquid delivery pump 24 in Figure 1 is introduced into the housing 45 through the second inlet 42. The main material slurry S1 and the curing initiator slurry S2 merge within the housing 45 and are agitated and mixed by a rotor 44 driven by a motor M. The rotor 44 has a shaft 44s connected to the motor M and blades 44b. As the rotor 44 rotates within the housing 45, the main material slurry S1 and the curing initiator slurry S2 are thoroughly mixed, resulting in a mixed slurry S3 with sufficiently reduced compositional variation. The mixed slurry S3 is discharged to the outside of the housing 45 through an outlet 48.

[0021] The mixed slurry S3 discharged from the outlet 48 flows through the channel 32 shown in Figure 1 and is then discharged from the discharge section 60. The discharge section 60 is attached to the position adjustment section 70, which adjusts the discharge position of the mixed slurry S3. In this way, the laminate 80 can be manufactured stably and continuously.

[0022] The dynamic mixer 40 is not limited to the dynamic mixer 40A shown in Figure 2. For example, a stator may be provided on the inner wall of the housing 45. In Figure 1, the position adjustment unit 70 is shown as a robot arm, but it is not limited to this and may be a gantry crane. This allows for smooth manufacturing even if the laminate 80 and cured product are large. In a modified example, the position adjustment unit may not move the discharge unit 60, but rather move the member on which the laminate 80 is placed, thereby adjusting the relative position between the discharge unit 60 and the laminate 80 (the member on which the laminate 80 is placed).

[0023] The main material slurry S1 contains a main material (solids) and water. The main material contains a first hydraulic binder. The main material may further contain a water-reducing agent, a retarder, and fine aggregate. The first hydraulic binder may contain at least cement and silica fume.

[0024] Examples of cement include various types of Portland cement such as ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, moderate-heat Portland cement, low-heat Portland cement, and sulfate-resistant Portland cement, as well as various blended cements such as blast furnace cement and fly ash cement. Only one type of cement may be used, or multiple types may be mixed and used. Among these, from the viewpoint of improving the hardening characteristics of the mixed slurry S3, the cement preferably includes at least one selected from the group consisting of ordinary Portland cement, rapid-hardening Portland cement, and ultra-rapid-hardening Portland cement, and more preferably includes rapid-hardening Portland cement.

[0025] The specific surface area of ​​cement is 3000-5000 cm². 2 / g, 3500~4900cm 2 / g, or 4000-4800cm 2 It may be / g. The Blaine specific surface area in this specification is measured in accordance with JIS R 5201:2015 "Physical Testing Methods for Cement".

[0026] Silica fume can be exemplified by those specified in JIS A 6207:2016 "Silica fume for concrete". The BET specific surface area of ​​silica fume is 10 m². 2 / g or more, 14m 2 / g or more, or 16m 2 The amount may be greater than or equal to / g. As shown in Figure 3, since silica fume 1 has a larger specific surface area than cement 3, it can be adsorbed around cement 3. As a result, silica fume 1 is thought to suppress the formation of calcium-derived gel around cement 3. Therefore, by adding silica fume to the main material slurry S1, the occurrence of "settlement" can be suppressed.

[0027] In this disclosure, "consolidation" refers to the phenomenon in which the fluidity of the main material slurry S1 is impaired in the very early stages of development. Although a consolidated main material slurry S1 can regain its fluidity and be used as a slurry by re-stirring, the occurrence of consolidation reduces work efficiency. Therefore, by including silica fume in the main material slurry S1, re-stirring is unnecessary when using the main material slurry S1, and excellent workability can be maintained. Whether or not consolidation has occurred can be confirmed by visually judging whether the main material slurry S1 flows after being left to stand for 20 minutes after preparation. If the main material slurry S1 does not flow even when the container is tilted, it can be said that consolidation has occurred. The BET specific surface area of ​​silica fume is, for example, 10 to 30 m². 2 / g is acceptable.

[0028] The silica fume content may be 3 parts by mass or more, or 5 parts by mass or more, per 100 parts by mass of the first hydraulic binder, from the viewpoint of improving mixability, compressive strength of the hardened product, and appearance. Furthermore, the silica fume content may be 40 parts by mass or less, 25 parts by mass or less, or 15 parts by mass or less, per 100 parts by mass of the first hydraulic binder, from the viewpoint of promoting the reaction between cement and retarder and improving the fluidity retention time (pot life). For example, the silica fume content may be 3 to 40 parts by mass, 5 to 25 parts by mass, or 5 to 15 parts by mass, per 100 parts by mass of the first hydraulic binder.

[0029] The silica fume content may be 5 parts by mass or more, 8 parts by mass or more, or 10 parts by mass or more per 100 parts by mass of cement, from the viewpoint of improving mixability, compressive strength of the hardened product, and appearance. Furthermore, the silica fume content may be 50 parts by mass or less, 40 parts by mass or less, or 35 parts by mass or less per 100 parts by mass of cement, from the viewpoint of promoting the reaction between cement and retarder, maintaining the fluidity of the main material, and improving pot life. For example, the silica fume content may be 5 to 50 parts by mass, 8 to 40 parts by mass, or 10 to 35 parts by mass per 100 parts by mass of cement.

[0030] The first hydraulic binder may contain components other than cement and silica fume. Such components include, for example, blast furnace slag fine powder (e.g., those conforming to JIS A 6206:2013 "Blast Furnace Slag Fine Powder for Concrete"), limestone fine powder, fly ash, and gypsum. The Blaine specific surface area of the blast furnace slag fine powder may be 2500 - 10000 cm 2 / g, 3000 - 9000 cm 2 / g, or 4000 - 8000 cm 2 / g. Examples of fly ash include those defined in JIS A 6201:2015 "Fly Ash for Concrete". Examples of gypsum include dihydrate gypsum (CaSO4·2H2O), hemihydrate gypsum (CaSO4·1 / 2H2O), and anhydrous gypsum.

[0031] The content of the blast furnace slag fine powder may be 10 - 50 parts by mass, 10 - 40 parts by mass, or 15 - 35 parts by mass with respect to 100 parts by mass of the first hydraulic binder. When the first hydraulic binder contains blast furnace slag fine powder, the content of cement may be 40 parts by mass or more and less than 70 parts by mass with respect to 100 parts by mass of the first hydraulic binder. From the perspective of promoting the reaction between cement and retarder in a low-temperature environment and sufficiently maintaining the excellent fluidity of the main material slurry S1, the content of cement may be 45 parts by mass or more, or 50 parts by mass or more with respect to 100 parts by mass of the first hydraulic binder. From the perspective of further improving the miscibility of the main material slurry S1, the content of cement may be 65 parts by mass or less with respect to 100 parts by mass of the first hydraulic binder. The content of cement may be, for example, 45 parts by mass or more and less than 70 parts by mass, 50 parts by mass or more and less than 70 parts by mass, 40 - 65 parts by mass, or 50 - 65 parts by mass with respect to 100 parts by mass of the first hydraulic binder.

[0032] The water contained in the main slurry S1 is not particularly limited and may be, for example, tap water, distilled water, or deionized water. The water-to-binder ratio Z (ratio of water to the first hydraulic binder) in the main slurry S1 may be 0.15 to 0.65, 0.20 to 0.55, 0.20 to 0.45, or 0.30 to 0.40, from the viewpoint of maintaining sufficiently high fluidity while further improving the curability of the mixed slurry S3.

[0033] The fluidity of the main material slurry S1 can be evaluated by the flow test described in "JIS R5201:2015 Physical Test Methods for Cement". In this disclosure, the measured flow value evaluated by the above test is referred to as the "15-count flow value". From the viewpoint of providing a main material slurry S1 that can maintain excellent fluidity in low-temperature environments such as winter, when a slurry is prepared by mixing 33 parts by mass of water with 100 parts by mass of the first hydraulic binder at an environment of 5°C, the 15-count flow value for ages 0 to 7 days may be in the range of 170 to 290 mm. Such a main material slurry S1 allows for the omission of tasks such as replacing and cleaning containers and piping, even when construction is temporarily suspended during weekends or holidays. Then, work can be smoothly resumed at the beginning of the week or after the holidays. Therefore, excellent workability can be achieved in low-temperature environments such as winter. The above 15-count flow value may be in the range of 190 to 280 mm or 200 to 280 mm.

[0034] The retarders contained in the main material have the effect of slowing down the hardening reaction of cement. Examples of retarders include sodium gluconate, oxycarboxylic acids, sugars, and inorganic retarders. Oxycarboxylic acids include oxycarboxylic acids and their salts. Examples of oxycarboxylic acids include gluconic acid, tartaric acid, citric acid, malic acid, succinic acid, and heptonic acid. Examples of salts of oxycarboxylic acids include alkali metal salts (sodium salts, potassium salts, etc.) and alkaline earth metal salts (calcium salts, magnesium salts, etc.).

[0035] Of the aforementioned retarders, it is preferable to include sodium gluconate and sodium L-tartrate. It is thought that sodium gluconate and sodium L-tartrate exert their retarding effects at different times. That is, it is thought that sodium gluconate exerts its retarding effect first, followed by sodium L-tartrate. By including multiple types of retarders that exert their retarding effects at different times in this way, it is thought that the excellent fluidity of the main slurry S1 can be maintained for a long period of time even in a low-temperature environment.

[0036] The content of the retarder is 0.5 parts by mass or more, preferably 0.6 parts by mass or more, more preferably 0.7 parts by mass or more, and even more preferably 0.8 parts by mass or more, per 100 parts by mass of the first hydraulic binder. This allows the retarder to make sufficient contact with the cement even if silica fume 1 is adsorbed around the cement 3 as shown in Figure 3, thereby moderately delaying the hardening of the cement and extending the pot life of the main slurry S1. From the viewpoint of sufficiently increasing the strength development of the mixed slurry S3, the content of the retarder may be 5.0 parts by mass or less, 4.0 parts by mass or less, or 3.0 parts by mass or less, per 100 parts by mass of the binder.

[0037] The mass ratio α of the sodium L-tartrate content to the sodium gluconate content is 1.0 or higher. This allows the main slurry S1 to maintain excellent fluidity in low-temperature environments such as winter. The mass ratio α may be greater than 1.0, 1.2 or higher, or 1.5 or higher. This reduces the time-dependent fluctuation in fluidity in ambient and low-temperature environments. From a similar viewpoint, the mass ratio α may be 20 or less, 11 or less, 10 or less, 8.0 or less, 5.5 or less, 4.0 or less, or 3.5 or less. For example, the mass ratio α may be between 1.0 and 20.

[0038] The main slurry S1 may contain retarders other than sodium gluconate and sodium L-tartrate. From the viewpoint of fully obtaining the effect of improving fluidity by sodium gluconate and sodium L-tartrate, the total ratio of sodium gluconate and sodium L-tartrate to the total retarder may be 60% by mass or more, 70% by mass or more, 80% by mass or more, or 90% by mass or more. The retarder may consist only of sodium gluconate and sodium L-tartrate.

[0039] The main slurry S1 may contain a water-reducing agent. The water-reducing agent has the effect of improving the liquid-feeding properties. Examples of water-reducing agents include polycarboxylic acid-based, melamine sulfonic acid-based, naphthalene sulfone-based, and lignin sulfonic acid-based agents. From the viewpoint of suppressing the occurrence of compaction, polycarboxylic acid-based water-reducing agents are preferred. Specific examples of polycarboxylic acid-based water-reducing agents include polyether-polycarboxylic acid-based water-reducing agents and modified polycarboxylic acid-based water-reducing agents. One of these may be used alone, or two or more may be used in combination. The content of the water-reducing agent in the main slurry S1 relative to 100 parts by mass of the first hydraulic binder may be 0.05 to 1.2 parts by mass, 0.05 to 0.8 parts by mass, or 0.07 to 0.3 parts by mass. By setting the content of the water-reducing agent within the above range, the liquid-feeding properties of the main slurry S1 can be further improved.

[0040] Specific examples of modified polycarboxylic acid-based water-reducing agents include MELFLUX AP101F (trade name, manufactured by BASF Japan Ltd.). Specific examples of polyether-polycarboxylic acid-based water-reducing agents include MELFLUX 2641F, MELFLUX 2651F, MELFLUX 5581F, MELFLUX 4930F, MELFLUX 6681F, and MELFLUX SELECT 4411F (trade names, manufactured by BASF Japan Ltd.). From the viewpoint of suppressing stickiness of the main material slurry S1, it is preferable to include MELFLUX AP101F. On the other hand, from the viewpoint of adsorbing the water-reducing agent to the cement early and stabilizing the change in quality of the main material slurry S1 over time, the early-adsorption type MELFLUX 6681F may be used.

[0041] The fine aggregate contained in the main slurry S1 may include silica sand used in concrete aggregates, building materials, etc., as specified in JIS A 5308:2019, etc. From the viewpoint of liquid transferability when it is in slurry form, the particle size of the fine aggregate is preferably less than 1.0 mm, more preferably less than 0.5 mm. The particle size of the aggregate can be measured using several sieves with different mesh sizes as specified in JIS Z 8801-1:2019. The content of fine aggregate in the main slurry S1 relative to 100 parts by mass of the first hydraulic binder may be 50 to 300 parts by mass, 70 to 200 parts by mass, or 80 to 150 parts by mass.

[0042] The main slurry S1 may contain chemical admixtures other than water-reducing agents. The main slurry S1 may also contain a thickening agent as a chemical admixture. The thickening agent has the effect of suppressing material separation when the main slurry S1 is prepared. Examples of thickening agents include organic thickening agents such as cellulose-based thickening agents, starch-based thickening agents, guar gum-based thickening agents, and vinyl-based thickening agents, and inorganic thickening agents such as bentonite, kaolinite, and talc. One of these may be used alone, or two or more may be used in combination. The content of the thickening agent in the main slurry S1 relative to 100 parts by mass of the first hydraulic binder may be 0.01 to 1.0 parts by mass, 0.02 to 0.5 parts by mass, 0.03 to 0.3 parts by mass, or 0.04 to 0.15 parts by mass, or 0.05 to 0.1 parts by mass.

[0043] The main material slurry S1 may contain an antifoaming agent as a chemical admixture. Known antifoaming agents can be used. Specific examples of antifoaming agents include, for example, synthetic substances such as mineral oil-based, silicone-based, alcohol-based, and polyether-based substances, or natural substances derived from plants. Of these, from the viewpoint of dispersibility and persistence, the antifoaming agent may be a polyether-based antifoaming agent or a mineral oil-based antifoaming agent. One of these may be used alone, or two or more may be used in combination. The content of the antifoaming agent in the main material slurry S1 per 100 parts by mass of the first hydraulic binder may be 0.01 to 1.0 parts by mass, 0.05 to 0.7 parts by mass, 0.1 to 0.4 parts by mass, or 0.1 to 0.3 parts by mass.

[0044] The hardening initiator slurry S2 comprises a second hydraulic binder, alum, and water. The hardening initiator may further contain fine aggregate. The second hydraulic binder preferably contains silica fume, and more preferably contains silica fume and metakaolin. The second hydraulic binder does not necessarily contain cement. This allows the fluidity of the hardening initiator slurry S2 to be maintained for a long period of time.

[0045] The silica fume contained in the second hydraulic binder can be the same as the silica fume contained in the first hydraulic binder. The silica fume contained in the curing initiator slurry S2 may be the same type as the silica fume contained in the main material slurry S1, or it may be a different type. The silica fume content in the curing initiator slurry S2 may be 1 to 20 parts by mass, 2 to 10 parts by mass, or 3 to 8 parts by mass per 100 parts by mass of the first hydraulic binder contained in the main material slurry S1 to be mixed. By having the silica fume content in the curing initiator slurry S2 within the above range, the excellent fluidity of the mixed slurry S3 can be maintained for an even longer period of time.

[0046] The metakaolin that may be included in the second hydraulic binder contains SiO2 and Al2O3. By including metakaolin, a high level of both mixability and strength development of the mixed slurry S3 can be achieved, and laminates and cured products with high compressive strength can be stably obtained. The amount of metakaolin in the curing initiator slurry S2 relative to 100 parts by mass of the first hydraulic binder contained in the main material slurry S1 to be mixed may be 3 to 30 parts by mass, 5 to 20 parts by mass, or 7 to 15 parts by mass. The average particle size of the metakaolin may be 1 to 10 μm, or 2 to 8 μm.

[0047] Unless otherwise specified, the average particle size in this disclosure can be determined from the volume-based frequency distribution measured by a laser diffraction / scattering particle size distribution analyzer. For example, the "SALD-2200" manufactured by Shimadzu Corporation is used as the laser diffraction / scattering particle size distribution analyzer, and measurements are taken under dry conditions. The average particle size can be calculated as a weighted average value of the logarithm of the particle size, weighted by the volume-based frequency for that particle size, based on the relationship between the volume-based frequency and the particle size obtained from the above measurement.

[0048] Alum has the effect of accelerating the initial hardening of hydraulic binders and can also be called a rapid setting agent. By including alum in the hardening initiator slurry S2, the strength development of the mixed slurry S3 can be enhanced. This makes it possible to obtain laminates and cured products with high compressive strength. Alum is a double salt of a monovalent cation sulfate and a trivalent metal ion sulfate. Examples of alum include potassium alum, ammonium alum, sodium alum, iron alum, chromium alum, and their anhydrous forms (calcined alum). One of these alums may be used alone, or a combination of several may be used. From the viewpoint of obtaining a mixed slurry that can achieve a sufficiently high level of both mixability and hardening properties, it is preferable that the alum includes potassium alum. Potassium alum is a double salt of potassium sulfate and aluminum sulfate, represented by the chemical formula KAl(SO4)2·12H2O.

[0049] Commercially available alum may be used, or it may be crushed using a ball mill or the like. By reducing the particle size of the alum to a certain extent, it is possible to make it easier to exert the hardening-accelerating effect while maintaining ease of handling. From this viewpoint, the average particle size of the alum may be 0.01 to 1.0 mm, 0.02 to 0.3 mm, 0.03 to 0.2 mm, or 0.04 to 0.1 mm. Furthermore, when using potassium alum, from the viewpoint of suppressing the occurrence of white spots in the hardened product, the average particle size of the potassium alum may be 0.01 to 0.2 mm, 0.03 to 0.2 mm, or 0.04 to 0.1 mm.

[0050] The alum content is 0.05 parts by mass or more per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder. Such a mixed slurry exhibits excellent strength development. From the viewpoint of further improving strength development and sufficiently increasing the compressive strength of the laminate and cured product, the alum content is preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, even more preferably 1.0 part by mass or more, even more preferably 1.5 parts by mass or more, and particularly preferably 3.0 parts by mass or more, per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder. From the viewpoint of sufficiently suppressing the rise of the first liquid transfer pump 14 and the second liquid transfer pump 24 and manufacturing the laminate more stably and continuously, the alum content may be 8.0 parts by mass or less, 6.0 parts by mass or less, or 5.0 parts by mass or less per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder.

[0051] The curing initiator slurry S2 may contain curing accelerators other than alum. Examples of such curing accelerators include sulfates (alkali metal sulfates, aluminum sulfate, magnesium sulfate), carbonates (sodium carbonate, potassium carbonate, lithium carbonate), calcium thiocyanate, and calcium chloride.

[0052] Alkali metal sulfates contain sulfate ions (SO4 2- ) can be a source of sulfate ions (SO4) in the curing initiator slurry S2. 2-Even if the proportion of alum supplying the mixture is locally insufficient due to factors such as uneven mixing, the action of alkali metal sulfates ensures both sufficient mixing and sufficient strength development of the mixed slurry S3, making it possible to stably obtain laminates and cured products with high compressive strength. The alkali metal sulfates may be water-soluble. From the viewpoint of achieving a sufficiently high level of both mixing and strength development of the mixed slurry, the alkali metal sulfates may include at least one selected from the group consisting of potassium sulfate, sodium sulfate, and lithium sulfate, and may also include sodium sulfate.

[0053] The alkali metal sulfate content may be 0.05 to 5.0 parts by mass, 0.1 to 3.0 parts by mass, 0.2 to 2.5 parts by mass, 0.3 to 2.0 parts by mass, or 0.4 to 1.5 parts by mass per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder. This allows for a high level of both sufficient mixing and sufficient strength development of the mixed slurry S3, making it possible to obtain laminates and cured products with even higher compressive strength in a sufficiently stable and continuous manner.

[0054] The curing accelerator may also contain a gelling agent. Examples of such curing accelerators include basic aluminum salts. Basic aluminum salts are basic salts containing aluminum ions and hydroxy acid ions having 2 to 6 carbon atoms. Here, a basic salt is defined as a hydroxide ion (OH). - It is a salt containing ). In other words, a basic aluminum salt is a salt in which some of the anions in the salt of aluminum and a hydroxy acid are replaced with hydroxide ions. The general formula for a basic aluminum salt is: Al(OH) 3-x It can be represented as Yb, where x and b are selected such that the basic aluminum salt as a whole is electrically neutral. By using a basic aluminum salt, floc formation is suppressed when the mixed slurry S3 is prepared, and the mixability of each component can be improved.

[0055] The number of carbon atoms of the hydroxy acid ions contained in the basic aluminum salt may be 2 to 4, or may be 2 or 3, or may be 3. Examples of the basic aluminum salt include basic aluminum lactate, basic aluminum hydroxyacetate, basic aluminum citrate, basic aluminum tartrate, etc., and basic aluminum lactate is preferred. These may be hydrates. The basic aluminum salt may be used alone or in combination of two or more.

[0056] Basic aluminum lactate has the general formula Al(OH) 3-x (Lac.acid) x (0 < x < 3), and those with a molar ratio of Al2O3 / lactic acid of 0.3 to 2.0 are preferred. Lac.acid is a lactate ion. Basic aluminum lactate may be a hydrate. Examples of commercially available basic aluminum lactate include, for example, "Taxeram M-160P" (manufactured by Takagi Chemical Co., Ltd.). The content of basic aluminum lactate contained in the curing initiator slurry S2 is 0.2 to 6.0 parts by mass, 0.4 to 5.0 parts by mass, 0.6 to 4.0 parts by mass, or 0.8 to 3.0 parts by mass with respect to a total of 100 parts by mass of the first hydraulic binder and the second hydraulic binder. Thereby, sufficient miscibility of the mixed slurry S3 and sufficient strength development property can be achieved at a high level, and a laminate and a cured product having a higher compressive strength can be obtained sufficiently stably and continuously.

[0057] The total amount of curing accelerator contained in the curing initiator slurry S2 may be 1.5 to 15.0 parts by mass, 2.0 to 10.0 parts by mass, or 3.0 to 8.0 parts by mass per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder. This allows for a high level of balance between sufficient mixing and sufficient strength development in the mixed slurry S3, enabling the stable and continuous acquisition of laminates and cured products with even higher compressive strength. When a curing accelerator other than alum is included, the ratio of alum to the total amount of curing accelerator may be 20 to 80% by mass, 30 to 75% by mass, 40 to 70% by mass, or 45 to 65% by mass. This allows for a better balance between the mixing and strength development of the mixed slurry. The main material slurry S1 does not need to contain a curing accelerator. This allows for sufficient maintenance of the fluidity of the main material slurry S1.

[0058] The fine aggregate contained in the curing initiator slurry S2 may be the same as the fine aggregate contained in the main material slurry S1. The fine aggregate contained in the curing initiator slurry S2 may be the same type as the fine aggregate contained in the main material slurry S1, or it may be a different type. The fine aggregate content in the curing initiator slurry S2 may be 5 to 100 parts by mass, 10 to 70 parts by mass, or 25 to 55 parts by mass per 100 parts by mass of the first hydraulic binder contained in the main material slurry S1 to be mixed.

[0059] The water contained in the curing initiator slurry S2 is not particularly limited and may be, for example, tap water, distilled water, or deionized water. The water-to-binder ratio Y (ratio of water to the second hydraulic binder) in the curing initiator slurry S2 may be 0.40-1.20, 0.20-0.70, 0.30-0.65, 0.40-0.65, or 0.50-0.62, from the viewpoint of maintaining sufficiently high fluidity of the curing initiator slurry S2 while further improving the curability of the mixed slurry S3.

[0060] The ratio of the water-binder ratio Z of the main material slurry to the water-binder ratio Y of the curing initiator slurry (Z / Y) may be 1.625 or less, 1.5 or less, 1.0 or less, 0.8 or less, 0.7 or less, or 0.6 or less. By setting Z / Y within this range, both the main material slurry and the curing initiator slurry can have excellent fluidity, and the uniformity of the mixing of the main material slurry and the curing initiator slurry can be sufficiently high. From a similar viewpoint, Z / Y may be 0.125 or more, 0.2 or more, 0.3 or more, or 0.4 or more. For example, Z / Y may be between 0.125 and 1.625.

[0061] The ratio (WA / BA) of the total amount of water WA contained in the main slurry S1 and the curing initiator slurry S2 to the total amount of binders BA (= sum of the first binder and the second binder) contained in the main slurry S1 and the curing initiator slurry S2 may be 0.20 to 0.55, 0.25 to 0.50, 0.30 to 0.45, or 0.35 to 0.40. By setting WA / BA within this range, the uniformity of the mixing of the main slurry S1 and the curing initiator slurry S2 can be sufficiently high.

[0062] The curing initiator slurry S2 may contain chemical admixtures. Examples of chemical admixtures are the same as those listed for the main slurry S1. For example, the curing initiator slurry S2 may contain defoaming agents and thickening agents. The defoaming agents and thickening agents may be those listed in the description of the main slurry S1. The components of the main slurry S1 and the curing initiator slurry S2 are not limited to those described above.

[0063] The laminate manufacturing system 100, equipped with a dynamic mixer 40 (40A), can sufficiently mix the main material slurry S1 and the curing initiator slurry S2 even when the alum content in the curing accelerator, which affects the initial fluidity of the mixed slurry S3, is high. This suppresses variations in the composition of the mixed slurry S3 and effectively prevents increases in the discharge pressure of the first liquid transfer pump 14 and the second liquid transfer pump 24, as well as blockages in piping, etc. Therefore, the laminate manufacturing system 100 can stably and continuously manufacture laminates.

[0064] A method for manufacturing a laminate according to one embodiment may be carried out using, for example, the laminate manufacturing system 100 shown in Figure 1. In this case, the method for manufacturing a laminate includes a first supply step of supplying a main material slurry S1 containing a first hydraulic binder and water; a second supply step of supplying a curing initiator slurry S2 containing a second hydraulic binder, alum, and water; a mixing step of combining the main material slurry S1 and the curing initiator slurry S2 and mixing them in a dynamic mixer 40 to obtain a mixed slurry; and a lamination step of discharging the mixed slurry S3 to obtain a laminate 80.

[0065] The first supply step may be performed using the first supply unit 10, and the second supply step may be performed using the second supply unit 20. The mixing step may be performed using, for example, the dynamic mixer 40A shown in Figure 2. The lamination step may be performed using the discharge unit 60 and the position adjustment unit 70. Therefore, the contents described in the laminate manufacturing system 100 also apply to the laminate manufacturing method of this embodiment.

[0066] The method for manufacturing this laminate includes a mixing step in which a main material slurry S1 and a curing initiator slurry S2 are combined and mixed in a dynamic mixer 40 (40A) to obtain a mixed slurry S3. By having such a mixing step before the lamination step, even if the content of alum, which affects the initial fluidity of the mixed slurry among the curing accelerators, is high, the main material slurry S1 and the curing initiator slurry S2 can be sufficiently mixed. This suppresses variations in the composition of the mixed slurry S3 and sufficiently suppresses increases in the discharge pressure of the first liquid transfer pump 14 and the second liquid transfer pump 24, as well as the occurrence of blockages in piping, etc. Therefore, according to the above method for manufacturing the laminate, the laminate 80 can be manufactured stably and continuously.

[0067] One embodiment of the method for producing a cured product includes a curing step to obtain a cured product by curing a laminate 80 obtained using the laminate manufacturing system 100 described above, or a laminate 80 obtained by the laminate manufacturing method described above. This method for producing a cured product includes a curing step to obtain a cured product by curing a laminate 80 obtained by the laminate manufacturing system 100 or laminate manufacturing method, which is capable of stable and continuous operation, while using a mixed slurry S3 that exhibits excellent strength development. Therefore, a cured product with high compressive strength can be produced. The compressive strength of the cured product evaluated by the method of the example at 7 days of age is 43 N / mm 2 Above 45 N / mm 2 Above or above, or 50 N / mm 2 The above is acceptable. The compressive strength of the cured material at 28 days of age, evaluated in the same manner as in the examples, is 58 N / mm². 2 More than 60N / mm 2 Above or above, or 62 N / mm 2 That's all.

[0068] Although embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above.

[0069] Based on the above, this disclosure includes several embodiments. [1] A first supply unit that supplies a first hydraulic binder and a main material slurry containing water, A second supply unit supplies a curing initiator slurry containing a second hydraulic binder, alum, and water. A dynamic mixer that combines the main material slurry and the curing starter slurry to obtain a mixed slurry, The system includes a discharge unit that discharges the mixed slurry to obtain a laminate, A laminate manufacturing system wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder. [2] A manufacturing system for a laminate according to [1], further comprising a position adjustment unit configured to adjust the relative position between the discharge position of the mixed slurry discharged from the discharge unit and the laminate. [3] The dynamic mixer is A rotor, which is rotationally driven by a motor, stirs and mixes the main material slurry and the curing initiator slurry, A housing for the rotor, The housing includes a first inlet for introducing the main material slurry, The housing includes a second inlet for introducing the curing initiator slurry, A manufacturing system for a laminate according to [1] or [2], comprising an outlet for discharging the mixed slurry from within the housing. [4] The first hydraulic binder comprises cement, silica fume and blast furnace slag, The manufacturing system for a laminate according to any one of [1] to [3], wherein the second hydraulic binder comprises silica fume. [5] The main material slurry comprises a water-reducing agent, a retarder, and fine aggregate. The manufacturing system for a laminate according to any one of [1] to [4], wherein the curing initiator slurry comprises a curing accelerator containing alum and fine aggregate. [6] The retarder comprises sodium gluconate and sodium L-tartrate, and is a method for producing a laminate according to any one of [1] to [5]. [7] The manufacturing system for a laminate according to any one of [1] to [6], wherein the curing initiator slurry comprises metakaolin and sodium sulfate. [8] A first supply step of supplying a first hydraulic binder and a main material slurry containing water, A second supply step provides a curing initiator slurry containing a second hydraulic binder, alum, and water. A mixing step in which the main material slurry and the curing initiator slurry are combined and mixed in a dynamic mixer to obtain a mixed slurry, The process includes a lamination step of discharging the mixed slurry to obtain a laminate, A method for manufacturing a laminate, wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder. [9] A method for producing a cured product, comprising a curing step of curing a laminate obtained using the laminate manufacturing system described in any one of [1] to [7] above, or a laminate obtained by the laminate manufacturing method described in [8], to obtain a cured product. [Examples]

[0070] The contents of this disclosure will be explained in more detail below with reference to examples, comparative examples, and reference examples. However, this disclosure is not limited to the examples described below.

[0071] The raw materials for the main slurry and the curing initiator slurry were prepared as shown in Table 1. [Table 1]

[0072] <Preparation of main material slurry> A premix powder was prepared by blending the powdered raw materials other than water from the main slurry materials shown in Table 1 in the ratios shown in Table 2. The blending amounts for "external ratio" in Table 2 are parts by mass relative to 100 parts by mass of the first hydraulic binder (cement + blast furnace slag fine powder + silica fume). After blending the powdered raw materials other than water, the mixture was stirred at low speed for 30 seconds in a Hobart mixer (manufactured by Hobart Japan Co., Ltd., product name: Mixer N50) (dry mixing), then the amount of water shown in Table 2 was added and mixed at low speed for a further 90 seconds, after which any powder or paste adhering to the sides of the container was scraped off. After that, the mixture was mixed at high speed for 90 seconds to prepare the main slurry for Examples 1-3, Comparative Example 1, and Reference Example 1 shown in Table 2. The water-to-binder ratio (W / B) of the main slurry was 0.33.

[0073] [Table 2]

[0074] <Preparation of curing initiator slurry> A premix powder was prepared by blending the powder ingredients other than water from the curing initiator slurry materials shown in Table 1 in the ratios shown in Table 3. After blending the powder ingredients other than water, the mixture was stirred at low speed for 30 seconds (dry mixing) using a Hobart mixer (manufactured by Hobart Japan Co., Ltd., product name: Mixer N50). Then, water was added in the parts by mass shown in Table 3 and mixed at low speed for a further 90 seconds, scraping off any powder or paste adhering to the sides of the container. After that, the mixture was mixed at high speed for 90 seconds to prepare curing initiator slurries for Examples 1-3, Comparative Example 1, and Reference Example 1 having the compositions shown in Table 3. The water-to-binder ratio (W / B) of the curing initiator slurry was 0.57.

[0075] [Table 3]

[0076] (Example 1) <Manufacturing of laminates> A laminate manufacturing system equipped with a dynamic mixer as shown in Figure 1 was prepared. The main material slurry of Example 1 shown in Table 2 and the curing initiator slurry of Example 1 shown in Table 3 were mixed using the respective pumps so that they were blended in the parts-by-mass ratios listed in Tables 2 and 3, and then mixed using the dynamic mixer. The mixed slurry was continuously discharged from the nozzle tip while mixing with the dynamic mixer to produce a laminate. A photograph of the laminate produced in Example 1 is shown in Figure 4. As shown in Figure 4, it was possible to produce a laminate with excellent aesthetics by continuously discharging the mixed slurry over a long period of time.

[0077] <Evaluation of intensity development> The mixed slurry discharged from the nozzle was poured into the mold in a two-layered structure in the vertical direction, the surface was leveled, and the mold was filled to produce cylindrical specimens measuring φ50 mm × 100 mm. The specimens were sealed and cured at 20°C and 60 RH for 6 days, after which they were removed from the mold and cured in air at 20°C and 60 RH. Then, each specimen was subjected to a 7-day compressive strength test in accordance with JIS A 1108:2018 "Test Method for Compressive Strength of Concrete". The test results are shown in Table 4.

[0078] (Examples 2, 3) Laminates were manufactured in the same manner as in Example 1, except that the main material slurries for Examples 2 and 3 shown in Table 2, and the curing initiator slurries for Examples 2 and 3 shown in Table 3 were used. In these examples as well, it was possible to manufacture laminates with excellent aesthetics by continuously discharging the mixed slurry over a long period of time. Compressive strength tests were performed on the specimens in the same manner as in Example 1. The test results are shown in Table 4.

[0079] (Comparative Example 1) A laminate manufacturing system equipped with a static mixer was prepared. The main material slurry of Comparative Example 1 shown in Table 2 and the curing initiator slurry of Comparative Example 1 shown in Table 3 were mixed using the respective pumps in the parts-by-mass ratios listed in Tables 2 and 3, and then mixed using the static mixer. As a result, shortly after mixing began, the static mixer became blocked, and the outlet pressure of the pump exceeded the upper limit, so the fluid supply was stopped. Therefore, it was not possible to manufacture the laminate.

[0080] The compressive strength test of the specimen was performed in the same manner as in Example 1 using the mixed slurry discharged from the nozzle before blockage occurred. The test results are shown in Table 4.

[0081] (Reference example 1) The main material slurry of Reference Example 1 shown in Table 2 and the curing initiator slurry of Reference Example 1 shown in Table 3 were mixed in the parts-by-mass ratios described in Tables 2 and 3, respectively, and introduced into a Hobart mixer (manufactured by Hobart Japan Co., Ltd., product name: Mixer N50). The mixture was stirred at low speed for 30 seconds in the Hobart mixer. Stirring was stopped, and paste adhering to the sides and bottom of the container was scraped off. The mixture was then stirred further so that the total stirring time, including the scraping time, was 60 seconds, and a mixed slurry was prepared. Using this mixed slurry, a compressive strength test of the specimen was performed in the same manner as in Example 1. The test results are shown in Table 4. Figure 5 summarizes the contents of Tables 3 and 4.

[0082] [Table 4]

[0083] Table 4 shows the content of the curing accelerator in the laminate as a mass ratio to the total of the first hydraulic binder and the second hydraulic binder. In Example 1, which used a dynamic mixer, it was possible to continuously discharge the mixed slurry and produce a laminate with a good appearance. In Examples 2 and 3, where the amount of curing accelerator was increased, it was also possible to continuously discharge the mixed slurry and produce a laminate with a good appearance. Furthermore, the compressive strength of the cured product increased as the amount of curing accelerator increased. This confirmed that the main material slurry and the curing initiator slurry were sufficiently mixed. On the other hand, in Comparative Example 1, which used a static mixer, it was not possible to continue discharging the mixed slurry due to blockage of the flow path caused by uneven mixing, and therefore it was not possible to produce a laminate.

[0084] In Reference Example 1, which used a Hobart mixer, the main material slurry and the curing initiator slurry were thoroughly mixed, and the mixed slurry is considered to be completely homogeneous. The difference between the compressive strength of Example 1 and the compressive strength of Reference Example 1, which had the same curing accelerator content, was relatively small. This also indicates that the main material slurry and the curing initiator slurry were thoroughly mixed in the mixed slurry of Example 1. [Explanation of symbols]

[0085] 1...Silica fume, 3...Cement, 10...First supply unit, 12...First containment unit, 14...First liquid transfer pump, 20...Second supply unit, 22...Second containment unit, 24...Second liquid transfer pump, 32...Flow path, 40, 40A...Dynamic mixer, 41...First inlet, 42...Second inlet, 44...Rotor, 44b...Blade, 44s...Shaft, 45...Housing, 48...Outlet, 60...Discharge unit, 70...Position adjustment unit, 80...Laminate, 100...Laminate manufacturing system.

Claims

1. A first supply unit that supplies a first hydraulic binder and a main material slurry containing water, A second supply unit supplies a curing initiator slurry containing a second hydraulic binder, alum, and water. A dynamic mixer that combines the main material slurry and the curing starter slurry to obtain a mixed slurry, The system includes a discharge unit that discharges the mixed slurry to obtain a laminate, A laminate manufacturing system wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more per 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder.

2. The manufacturing system for a laminate according to claim 1, further comprising a position adjustment unit configured to adjust the relative position between the discharge position of the mixed slurry discharged from the discharge unit and the laminate.

3. The aforementioned dynamic mixer is, A rotor, which is rotationally driven by a motor, stirs and mixes the main material slurry and the curing initiator slurry, A housing for the rotor, The housing includes a first inlet for introducing the main material slurry, The housing includes a second inlet for introducing the curing initiator slurry, A laminate manufacturing system according to claim 1 or 2, comprising an outlet for discharging the mixed slurry from within the housing.

4. The first hydraulic binder comprises cement, silica fume, and blast furnace slag. The manufacturing system for a laminate according to claim 1 or 2, wherein the second hydraulic binder comprises silica fume.

5. The main material slurry includes a water-reducing agent, a retarder, and fine aggregate. The manufacturing system for a laminate according to claim 1 or 2, wherein the curing initiator slurry comprises a curing accelerator containing alum and fine aggregate.

6. The laminate manufacturing system according to claim 5, wherein the retarder comprises sodium gluconate and sodium L-tartrate.

7. The lamination manufacturing system according to claim 5, wherein the curing initiator slurry comprises metakaolin and alkali metal sulfate.

8. A first supply step for supplying a first hydraulic binder and a main material slurry containing water, A second supply step involves supplying a curing initiator slurry containing a second hydraulic binder, alum, and water. A mixing step in which the main material slurry and the curing initiator slurry are combined and mixed in a dynamic mixer to obtain a mixed slurry, The process includes a lamination step of discharging the mixed slurry to obtain a laminate, A method for manufacturing a laminate, wherein the alum content in the curing initiator slurry is 0.05 parts by mass or more with respect to 100 parts by mass of the total of the first hydraulic binder and the second hydraulic binder.

9. A method for producing a cured product, comprising a curing step of curing a laminate obtained using the laminate production system described in claim 1 or 2, or a laminate obtained by the laminate production method described in claim 8, to obtain a cured product.

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