Powder composition, mortar material for additive manufacturing, molded object, and method for manufacturing molded object

Abstract

Provided is a powder composition that can be suitably used in additive manufacturing processes. According to one aspect of the present invention, there is provided a powder composition for use in producing a mortar material for additive manufacturing, the powder composition comprising a binder (A), a fine aggregate (B) and an admixture (C) that imparts thixotropy.

Description

[Technical field]

[0001] The present invention relates to a powder composition, a mortar material for additive manufacturing, a shaped object, and a method for manufacturing a shaped object. [Background technology]

[0002] In recent years, a method of modeling using hydraulic materials such as cement and gypsum and an additive manufacturing device has been proposed. For example, Patent Document 1 discloses an additive manufacturing method capable of stably manufacturing objects having delicate and diverse designs even when the hydration of a cementitious kneaded material progresses and the fluidity of the kneaded material decreases. Patent Document 2 discloses a hydraulic composition for additive manufacturing that has excellent extrudability and lamination properties and high interlayer adhesion strength after hardening. Patent Document 3 discloses a method of selecting a hydraulic composition for an extrusion-type additive manufacturing device capable of manufacturing objects having delicate and diverse designs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-122539 A [Patent Document 2] JP 2020-105023 A [Patent Document 3] JP 2020-90004 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is still room for development of materials that are compatible with additive manufacturing processes.

[0005] In view of the above circumstances, the present invention provides a powder composition that can be suitably used in additive manufacturing processes. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a powder composition used to produce a mortar material for additive manufacturing. The powder composition includes a binder (A), a fine aggregate (B), and an admixture (C) that imparts thixotropy. When a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the binder (A) and the fine aggregate (B), and a slump test is performed on the sample at 20°C in accordance with JIS A 1171, T1(5) is 2 cm or less. Here, T1(5) is the slump value of the slump test performed on the sample 5 minutes after preparation. When a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the binder (A) and the fine aggregate (B), and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(5;15) is 110 mm or more. Here, T2(5;15) is the flow value of 15 strokes in a flow table test performed on a sample 5 minutes after its preparation.

[0007] According to the above aspect, a powder composition or the like useful for additive manufacturing processes is provided. [Brief description of the drawings]

[0008] [Figure 1] Photographs showing the results of a slump test. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present invention will be described with reference to the first and second embodiments. Note that the various features shown in the following embodiments can be combined with each other. In addition, in this specification, "~" means "above" through "below" unless otherwise specified.

[0010] <<First embodiment>> That is, the powder composition according to the first embodiment is as follows. 1. A powder composition used to produce a mortar material for additive manufacturing, comprising: The present invention comprises a binder (A), a fine aggregate (B), and an admixture (C) that imparts thixotropy, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and when a slump test is carried out on the sample at 20°C in accordance with JIS A 1171, T1(5) is 2 cm or less, where T1(5) is the slump value of the slump test performed on the sample 5 minutes after preparation, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and when a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(5;15) is 110 mm or more, wherein T2(5;15) is the flow value at 15 strokes of the flow table test performed on the sample 5 minutes after preparation, powder composition.

[0011] The powder composition of the present embodiment is used to produce a mortar material for additive manufacturing. Here, additive manufacturing is a processing method in which a shape is formed by layering materials. In this embodiment, a mortar material obtained from a powder composition is layered to obtain a predetermined shape.

[0012] Such modeling can be performed using an additive manufacturing device (3D printer). The additive manufacturing device is a type of industrial robot that uses 3D data created by a computer as a design drawing and stacks cross-sectional shapes to create a three-dimensional object. The additive manufacturing device may be a commercially available product or a known device. More specifically, the above-mentioned modeling can be performed by filling a tank provided in the additive manufacturing device with mortar material and extruding the mortar material from a nozzle provided in the additive manufacturing device. The use of the model obtained here may be set appropriately, but one example is a construction.

[0013] The powder composition of this embodiment is typically a premix material for obtaining such a mortar material. That is, the mortar material for additive manufacturing of this embodiment can be said to be obtained by adding water to the powder composition. Here, the amount of water to be added may be appropriately set depending on the composition of the powder composition, the process conditions to be applied, etc., but is preferably 12.0 to 18.0 parts by mass relative to 100 parts by mass of the powder composition. The water to be added here may be appropriately set depending on the application, but may be tap water or ion-exchanged water. The amount of water to be added is more preferably 13.0 to 16.0 parts by mass, and most preferably 14.0 to 15.0 parts by mass relative to 100 parts by mass of the powder composition.

[0014] In this embodiment, it is preferable that such an additive manufacturing mortar material has certain properties, but this will be explained later.

[0015] Next, various components that may constitute the powder composition of this embodiment will be described.

[0016] [Binding material (A)] The powder composition of the present embodiment contains a binder (A). Here, the binder (A) is a general term for inorganic materials that contribute to the development of strength in mortar or concrete.

[0017] Here, the binder (A) may contain a cement component (A1). The cement component (A1) may contain a component selected from the group consisting of ordinary Portland cement, moderate-heat Portland cement, low-heat Portland cement, high-early-strength Portland cement, sulfate-resistant Portland cement, blast-furnace cement, and fly ash cement.

[0018] In addition, the binder (A) may contain an admixture (A2). The admixture (A2) may contain a component selected from the group consisting of fly ash, ground granulated blast furnace slag, ground limestone, stone powder, silica fume, and an expansive material (lime composite expansive material). These admixtures (A2) are typically mixed in combination with the above-mentioned cement component (A1).

[0019] The binder (A) may be used alone or in combination of two or more. When using two or more types in combination, binders having different particle sizes may be mixed.

[0020] The content of the binder (A) in the entire powder composition can be appropriately set, but when the mass of the entire powder composition is taken as 100 parts by mass, the content of the binder (A) is preferably 20 to 80 parts by mass, more preferably 25 to 75 parts by mass, and most preferably 30 to 70 parts by mass. By setting it in such a range, it becomes easier to achieve a balance between the hardening property as the obtained mortar material and the strength of the obtained hardened product.

[0021] In addition, the powder composition of this embodiment preferably contains ordinary Portland cement as the binder (A). By appropriately adding this ordinary Portland cement, it is possible to ensure an appropriate setting speed while contributing to improving the strength of the resulting shaped object, and to improve the balance between stackability and pumpability. The amount of this ordinary Portland cement is preferably 40 to 90 parts by mass, more preferably 50 to 85 parts by mass, and most preferably 60 to 75 parts by mass, when the total mass of the binder (A) is 100 parts by mass.

[0022] In addition, the powder composition of this embodiment preferably contains ground granulated blast furnace slag as the binder (A). By appropriately adding this ground granulated blast furnace slag, it is possible to contribute to improving the strength of the obtained shaped object. The amount of the ground granulated blast furnace slag is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, and most preferably 20 to 40 parts by mass, when the total mass of the binder (A) is 100 parts by mass.

[0023] In addition, the powder composition of this embodiment preferably contains fly ash as the binder (A). By appropriately adding this fly ash, it is possible to contribute to improving the strength of the obtained shaped object. The amount of this fly ash is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, and most preferably 20 to 40 parts by mass, when the total mass of the binder (A) is 100 parts by mass.

[0024] In addition, the powder composition of the present embodiment preferably contains silica fume as the binder (A). By appropriately including this silica fume, it is possible to improve the balance between the lamination property and pumpability of the obtained mortar material. The amount of this silica fume to be mixed is preferably 3 to 30 parts by mass, more preferably 5 to 20 parts by mass, and most preferably 7 to 15 parts by mass, when the total mass of the binder (A) is 100 parts by mass.

[0025] [Fine aggregate (B)] The powder composition of the present embodiment contains fine aggregate (B). In the present embodiment, fine aggregate (B) refers to aggregate that passes entirely through a 10 mm mesh sieve and 85% or more by mass through a 5 mm mesh sieve (JIS A 0203:2014).

[0026] The type of fine aggregate (B) may be appropriately determined depending on the application, etc. As an example, the fine aggregate (B) may contain one or more components selected from the group consisting of sand, mountain sand, land sand, sea sand, silica sand, crushed sand, and slag fine aggregate. These fine aggregates (B) may be used alone or in combination of two or more types. When using in combination of two or more types, fine aggregates with different particle sizes may be mixed.

[0027] The content of the fine aggregate (B) in the entire powder composition can be appropriately set, but when the mass of the entire powder composition is taken as 100 parts by mass, the content of the fine aggregate (B) is preferably 20 to 80 parts by mass, more preferably 25 to 75 parts by mass, and most preferably 30 to 70 parts by mass. By setting it in such a range, it becomes easier to achieve both hardening property and strength of the obtained hardened product.

[0028] [Admixture that imparts thixotropy (C)] The powder composition of this embodiment includes an admixture (C) that imparts thixotropy. The powder composition of this embodiment is used to produce a mortar material for additive manufacturing, and this admixture (C) contributes to improving the thixotropy of the resulting mortar material. That is, as described above, the mortar material is used for additive manufacturing, and is typically subjected to an extrusion process during the manufacturing process. Here, if the mortar material has thixotropy, the extrudability is improved and the shape after extrusion is easily stabilized. The admixture (C) here refers to any agent that does not fall under the above-mentioned binder (A) and fine aggregate (B) and contributes to improving the thixotropy of the resulting mortar material.

[0029] The admixture (C) may be appropriately selected from known materials capable of imparting the above-mentioned properties. As an example, the admixture (C) that imparts thixotropy may contain one or more components selected from the group consisting of cellulose, modified cellulose, minerals, nanofibers, synthetic fibers, urethane, xanthan gum, diutan gum, starch ether, guar gum, polyacrylamide, carrageenan gum, agar, protein, and latex.

[0030] Examples of modified cellulose that can be used as the admixture (C) of this embodiment include carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.

[0031] Examples of minerals that can be used as the admixture (C) in this embodiment include clay minerals such as attapulgite, bentonite, montmorillonite, kaolin, and sepiolite.

[0032] Examples of nanofibers that can be used as the admixture (C) of this embodiment include carbon nanofibers and cellulose nanofibers.

[0033] Examples of synthetic fibers that can be used as the admixture (C) in this embodiment include polyolefin compounds such as polypropylene and polyethylene, polyvinyl alcohol, and polyvinyl acetate.

[0034] Examples of urethane usable as the admixture (C) of this embodiment include various urethane-based thickeners used as urethane-based associative thickeners. Examples of the urethane-based associative thickeners include "Thixostar" manufactured by Japan Materials Technology Co., Ltd., "Adekanol" series manufactured by ADEKA Corporation, and "SN Thickener" series manufactured by San Nopco Ltd.

[0035] Proteins that can be used as the admixture (C) of this embodiment include amino acid condensates having a predetermined molecular weight.

[0036] Examples of the latex that can be used as the admixture (C) in this embodiment include chloroprene rubber latex and acrylic latex.

[0037] The content of the admixture (C) in the entire powder composition can be appropriately set, but when the total mass of the binder (A) and the fine aggregate (B) is taken as 100 parts by mass, the content of the admixture (C) is preferably 0.03 to 0.12 parts by mass, more preferably 0.04 to 0.10 parts by mass, and most preferably 0.05 to 0.08 parts by mass. By setting the content in such a range, the strength of the obtained hardened product can be easily improved while maintaining the handleability of the obtained mortar material.

[0038] [Other ingredients] In addition, the powder composition of this embodiment may contain other components other than the above-mentioned components (A) to (C) in order to impart desired properties. Examples of other components include rheology modifiers (including water reducing agents, dispersants, fluidizing agents, etc.), short fibers, antifoaming agents, setting retarders, gas foaming substances, setting regulators, air-entraining agents, rust inhibitors, water repellents, antibacterial agents, colorants, antifreeze agents, anion exchangers such as hydrotalcite, and moisturizing agents such as urea. The amounts of these components to be blended are arbitrary.

[0039] The powder composition of the present embodiment preferably contains a rheology modifier. By appropriately including the rheology modifier, the lamination property and pumpability can be balanced. In one embodiment, the rheology modifier may be a polycarboxylic acid-based rheology modifier or a melamine-based rheology modifier. The amount of the rheology modifier is preferably 0.01 to 3 parts by mass, more preferably 0.03 to 1 part by mass, and most preferably 0.05 to 0.5 parts by mass, when the total mass of the binder (A) and the fine aggregate (B) is 100 parts by mass. The rheology modifier may also be called a "water reducing agent", a "dispersant", or a "fluidizing agent".

[0040] The powder composition of the present embodiment preferably contains short fibers. By appropriately including the short fibers, it is possible to contribute to improving the strength of the resulting shaped object, and to balance the lamination property and pumpability. As the short fibers, fibers made of polyester such as nylon can be used. The fiber length (average fiber length) of the short fibers is preferably 1 to 30 mm, more preferably 3 to 25 mm, and most preferably 5 to 20 mm. The blending amount of the short fibers is preferably 0.05 to 5 parts by volume, more preferably 0.08 to 3 parts by volume, and most preferably 0.1 to 1.5 parts by volume, when the total volume of the binder (A) and the fine aggregate (B) is 100 parts by volume.

[0041] [Method of producing powder composition] The powder composition of the present embodiment can be produced by mixing the various raw materials described above. The mixing method may be appropriately selected from among known methods, and is not particularly limited.

[0042] [Physical properties of powder composition] The powder composition of this embodiment preferably satisfies a predetermined characteristic when a sample is prepared by adding water. Specifically, the powder composition of this embodiment preferably gives a predetermined measured value when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and the sample is subjected to various tests 1 to 3 described below. In the following various tests, the sample is prepared, stored, and the test is performed in an environment of 20°C. In addition, in this specification, powders that cannot be tested are treated as not having measured values ​​in the first place. The above sample preparation conditions, storage conditions, and test conditions are set in order to discuss the physical properties in this section. However, when applying the powder composition of this embodiment to an additive manufacturing process, various conditions not limited to the above conditions can be used.

[0043] (Test 1; Slump test) That is, in the powder composition of this embodiment, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the binder (A) and the fine aggregate (B) in total, and a slump test is performed on the sample at 20°C in accordance with JIS A 1171, T1(5) is 2 cm or less. Here, T1(5) is the slump value of the slump test performed on the sample 5 minutes after preparation.

[0044] By setting T1(5) to a predetermined value or less in this way, it is possible to improve the lamination property when the mortar material obtained from the powder composition is subjected to an additive manufacturing process. It is more preferable that T1(5) is 1.5 cm or less, and most preferably 1.0 cm or less. The lower limit of T1(5) is not particularly limited, but an example is 0.1 cm or more.

[0045] Furthermore, the powder composition of this embodiment preferably has a difference between the above-mentioned T1(5) and T1(30) in the range of 0.1 to 1.8 cm. Note that T1(30) is the slump value of a slump test performed on a sample 30 minutes after preparation, but since T1(5) is usually larger than the value of T1(30), the above-mentioned difference can be obtained as "T1(5)-T1(30)". In this way, by making T1(5)-T1(30) equal to or less than a predetermined value, when a mortar material obtained from the powder composition is subjected to an additive manufacturing process, the lamination property can be improved for a long time. Note that T1(5)-T1(30) is more preferably 0.3 to 1.5 cm, and most preferably 0.5 to 1.2 cm.

[0046] (Test 2; Flow table test) That is, in the powder composition of this embodiment, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is performed on the sample at 20° C. in accordance with JIS-R5201, it is preferable that T2(5;0) is less than 110 mm. Here, T2(5;0) is the flow value at 0 strokes in the flow table test performed on the sample 5 minutes after preparation.

[0047] By setting T2(5;0) to a predetermined value or less in this way, the lamination property can be improved when the mortar material obtained from the powder composition is subjected to an additive manufacturing process. It is more preferable that T2(5;0) is 108 mm or less, and most preferably 105 mm or less. The lower limit of T2(5;0) is not particularly limited, but an example is 100 mm or more.

[0048] In addition, in the powder composition of this embodiment, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the binder (A) and fine aggregate (B) in total, and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(5;15) is 110 mm or more. Here, T2(5;15) is the flow value at 15 strokes in the flow table test performed on the sample 5 minutes after preparation.

[0049] By setting T2(5;15) to a predetermined value or more in this way, when the mortar material obtained from the powder composition is subjected to an additive manufacturing process, the pumpability and fluidity can be improved. T2(5;15) is more preferably 115 mm or more, and most preferably 120 mm or more. The upper limit of T2(5;15) is not particularly limited, but an example is 140 mm or less.

[0050] Furthermore, the powder composition of this embodiment preferably has a difference between the above-mentioned T2(5;15) and T2(5;0) in the range of 5 to 40 mm. Since T2(5;15) is usually larger than the numerical value of T2(5;0), the above-mentioned difference can be obtained as "T2(5;15)-T2(5;0)". By making T2(5;15)-T2(5;0) equal to or less than a predetermined numerical value, the balance of lamination property, pumpability, and fluidity can be improved when the mortar material obtained from the powder composition is subjected to an additive manufacturing process. Furthermore, T2(5;15)-T2(5;0) is more preferably 7 to 30 mm, and most preferably 10 to 20 mm.

[0051] In addition, the powder composition of this embodiment preferably has a T2(30;0) of less than 108 mm when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201. Here, T2(30;0) is the flow value at 0 strokes in the flow table test performed on the sample 30 minutes after preparation.

[0052] By setting T2(30;0) to a predetermined value or less in this way, when the mortar material obtained from the powder composition is subjected to an additive manufacturing process, the lamination property can be improved over a long period of time. It is more preferable that T2(30;0) is 106 mm or less, and most preferably 105 mm or less. The lower limit of T2(30;0) is not particularly limited, but an example is 98 mm or more.

[0053] In addition, the powder composition of the present embodiment preferably has a T2(30;15) of 108 mm or more when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201. 30 This is the flow value of 15 strokes from a flow table test performed on a sample that was aged for 15 minutes.

[0054] By setting T2(30;15) to a predetermined value or more in this way, when the mortar material obtained from the powder composition is subjected to an additive manufacturing process, the pumpability and fluidity can be improved over a long period of time. It is more preferable that T2(30;15) is 110 mm or more, and most preferably 115 mm or more. The upper limit of T2(30;15) is not particularly limited, but an example is 130 mm or less.

[0055] Furthermore, the powder composition of this embodiment preferably has a difference between the above-mentioned T2(30;15) and T2(30;0) in the range of 5 to 20 mm. Since T2(30;15) is usually larger than the numerical value of T2(30;0), the above-mentioned difference can be obtained as "T2(30;15)-T2(30;0)". By making T2(30;15)-T2(30;0) equal to or less than a predetermined numerical value in this way, when the mortar material obtained from the powder composition is subjected to an additive manufacturing process, the balance of lamination property, pumpability, and fluidity can be improved for a long period of time. Furthermore, T2(30;15)-T2(30;0) is more preferably 7 to 15 mm, and most preferably 8 to 12 mm.

[0056] (Test 3: Hand vane shear test) Furthermore, the powder composition of this embodiment preferably has a T3(5) of 1.5 to 5 kPa when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the binder (A) and the fine aggregate (B) in total, and the sample is subjected to a hand vane shear test at 20°C in accordance with JGS 1411. Here, T3(5) is the shear yield value of the hand vane shear test performed on the sample 5 minutes after preparation.

[0057] By setting T3(5) in a predetermined range in this way, when the mortar material obtained from the powder composition is subjected to an additive manufacturing process, the lamination property can be improved and appropriate workability can be ensured. Note that T3(5) is more preferably 1.7 to 4.5 kPa, and most preferably 2.0 to 4.0 kPa.

[0058] Furthermore, the powder composition of this embodiment preferably has a T3(30) of 3.0 to 8.0 kPa when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the binder (A) and the fine aggregate (B) in total, and the sample is subjected to a hand vane shear test at 20°C in accordance with JGS 1411. Here, T3(30) is the shear yield value of the hand vane shear test performed on the sample 30 minutes after preparation.

[0059] By setting T3(30) in a predetermined range in this way, when a mortar material obtained from the powder composition is subjected to an additive manufacturing process, it is possible to improve lamination property over a long period of time, and in addition, it is possible to ensure appropriate workability over a long period of time. Note that T3(30) is more preferably 3.5 to 7.5 kPa, and most preferably 4.0 to 7.0 kPa.

[0060] Furthermore, in the powder composition of this embodiment, the difference between the above-mentioned T3(30) and T3(5) is preferably in the range of 1.5 to 6.5 kPa. Since T3(30) is usually larger than the numerical value of T3(5), the above-mentioned difference can be obtained as "T3(30)-T3(5)". By setting T3(30)-T3(5) to a predetermined numerical range in this way, when the mortar material obtained from the powder composition is subjected to an additive manufacturing process, the lamination property and processability can be improved over a long period of time. Furthermore, T3(30)-T3(5) is more preferably 2.0 to 6.0 kPa, and most preferably 2.5 to 5.0 kPa.

[0061] The measured values ​​in each of the above-mentioned tests can be realized by appropriately selecting the type of admixture (C), appropriately setting the mixing amount of the admixture (C), appropriately selecting the combination of the type of binder (A) or fine aggregate (B) with the admixture (C), etc.

[0062] [Mortar materials for additive manufacturing] As described above, the powder composition of the present embodiment is used as a premix material for obtaining a mortar material for additive manufacturing. That is, the powder composition of the present embodiment is converted into a mortar material for additive manufacturing by adding water. The properties of the mortar material for additive manufacturing may be appropriately set according to the application to be used, but it is preferable that the mortar material for additive manufacturing has the following properties, for example.

[0063] That is, the additive manufacturing mortar material of the present embodiment preferably maintains a state where T1(X) is 0 cm or more and 6 cm or less (more preferably, T1(X) is 1 cm or more and 2 cm or less) for at least 15 minutes when a slump test is performed at 20° C. in accordance with JIS A 1171. Here, T1(X) is the slump value of the slump test at a predetermined time.

[0064] That is, when the additive manufacturing mortar material of this embodiment is subjected to the above-mentioned Test 1, the time required to give a predetermined physical property value is greater than or equal to a predetermined value. This contributes to improving the usable time of the additive manufacturing mortar material. It is more preferable that the state where T1(X) is 0 cm or more and 6 cm or less (more preferably, the state where T1(X) is 1 cm or more and 2 cm or less) is maintained for at least 20 minutes, and most preferably, for 30 minutes.

[0065] In addition, the additive manufacturing mortar material of this embodiment preferably maintains a state where T2(X;0) is 100 mm or more and 120 mm or less (more preferably, T2(X;0) is 100 mm or more and 110 mm or less) for at least 15 minutes when a flow table test is performed at 20° C. in accordance with JIS-R5201. Here, T2(X;0) is the flow value of 0 strokes in the flow table test at a given time. In addition, the additive manufacturing mortar material of this embodiment preferably maintains a state where T2(X;15) is 110 mm or more and 140 mm or less (more preferably, T2(X;15) is 105 mm or more and 120 mm or less) for at least 15 minutes when a flow table test is performed at 20° C. in accordance with JIS-R5201. Here, T2(X;15) is the flow value of 15 strokes in the flow table test at a given time.

[0066] That is, when the additive manufacturing mortar material of this embodiment is carried out with the aforementioned test 2, the time required to give a predetermined physical property value is a predetermined value or more. This contributes to improving the pot life of the additive manufacturing mortar material. It is more preferable that the state where T2(X;0) is 100 mm or more and 120 mm or less (more preferably, the state where T2(X;0) is 100 mm or more and 110 mm or less) is maintained for at least 20 minutes, and most preferably, for 30 minutes. It is more preferable that the state where T2(X;15) is 110 mm or more and 140 mm or less (more preferably, the state where T2(X;15) is 105 mm or more and 120 mm or less) is maintained for at least 20 minutes, and most preferably, for 30 minutes.

[0067] In addition, the additive manufacturing mortar material of this embodiment preferably maintains a state where T3(X) is 1.0 kPa or more and 8.0 kPa or less (more preferably, T3(X) is 1.5 kPa or more and 5.0 kPa or less) for at least 15 minutes when a hand vane shear test is performed at 20°C in accordance with JGS 1411. Here, T3(X) is the shear yield value of the hand vane shear test at a predetermined time.

[0068] That is, when the additive manufacturing mortar material of this embodiment is subjected to the above-mentioned Test 3, the time required to give a predetermined physical property value is greater than or equal to a predetermined value. This contributes to improving the usable time of the additive manufacturing mortar material. It is more preferable that the state where T3(X) is 1.0 kPa or more and 8.0 kPa or less (more preferably, the state where T3(X) is 1.5 kPa or more and 5.0 kPa or less) is maintained for at least 20 minutes, and most preferably for 30 minutes.

[0069] [Manufacturing method for objects] Next, a method for manufacturing a model according to this embodiment will be described. That is, the manufacturing method of the object of this embodiment includes a step of preparing a mortar material for additive manufacturing, a step of molding the mortar material for additive manufacturing by an additive manufacturing method, and a step of hardening the molded mortar material for additive manufacturing.

[0070] That is, in this embodiment, the shaped object has a hardened mortar material for additive manufacturing. Such a shaped object can be obtained by preparing the mortar material for additive manufacturing described above, shaping it by additive manufacturing, and then hardening it. The additive manufacturing method used in this manufacturing method can be a known method, and the curing conditions can be arbitrary. In addition, when curing, temperature conditions, humidity conditions, etc. can be set.

[0071] As described above, according to the powder composition of the present embodiment, according to the aspect, a powder composition useful for additive manufacturing processes is provided.

[0072] <<Second embodiment>> The mortar material according to the second embodiment is as follows. 1. A mortar material for additive manufacturing, comprising: The present invention relates to a method for making a concrete mixture comprising: cement (A); fine aggregate (B); an admixture (C) for imparting thixotropy; and water. Mortar material for additive manufacturing.

[0073] That is, the mortar material of the second embodiment contains water in addition to the above-mentioned components (A), (B), and (C), but it does not necessarily have to be manufactured after obtaining a predetermined powder composition, and the constituent materials may be mixed in any order. In other words, it may be a mortar material obtained by mixing various materials in an additive manufacturing device.

[0074] In addition, various raw materials that can be used as the mortar material according to the second embodiment, and properties and uses that the mortar material for additive manufacturing may have may be the same as those shown in the first embodiment.

[0075] Furthermore, it may be provided in the following aspects:

[0076] (1) A powder composition used to produce a mortar material for additive manufacturing, the powder composition comprising a binder (A), a fine aggregate (B), and an admixture that imparts thixotropy (C).

[0077] (2) In the powder composition described in (1) above, the admixture (C) that imparts thixotropy contains one or more components selected from the group consisting of cellulose, modified cellulose, minerals, nanofibers, synthetic fibers, urethane, xanthan gum, diutan gum, starch ether, guar gum, polyacrylamide, carrageenan gum, agar, protein, and latex.

[0078] (3) In the powder composition according to (1) or (2) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a slump test is performed on the sample at 20°C in accordance with JIS A 1171, T1(5) is 2 cm or less, where T1(5) is a slump value in the slump test performed on the sample 5 minutes after preparation.

[0079] (4) In the powder composition according to any one of (1) to (3) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a slump test is performed on the sample at 20°C in accordance with JIS A 1171, the difference between T1(5) and T1(30), that is, T1(5)-T1(30), is in the range of 0.1 to 1.8 cm, where T1(5) is the slump value in the slump test performed on the sample 5 minutes after its preparation, and T1(30) is the slump value in the slump test performed on the sample 30 minutes after its preparation.

[0080] (5) In the powder composition according to any one of (1) to (4) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(5;0) is less than 110 mm, where T2(5;0) is the flow value at 0 strokes in the flow table test performed on the sample 5 minutes after preparation.

[0081] (6) In the powder composition according to any one of (1) to (5) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(5;15) is 110 mm or more, where T2(5;15) is a flow value at 15 strokes in the flow table test performed on the sample 5 minutes after preparation.

[0082] (7) In the powder composition according to any one of (1) to (6) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, the difference between T2(5;15) and T2(5;0) (T2(5;15)-T2(5;0)) is in the range of 5 to 40 mm, where T2(5;15) is the flow value at 15 strokes in the flow table test performed on the sample 5 minutes after its preparation, and T2(5;0) is the flow value at 0 stroke in the flow table test performed on the sample 5 minutes after its preparation.

[0083] (8) In the powder composition according to any one of (1) to (7) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(30;0) is less than 108 mm, where T2(30;0) is the flow value at 0 strokes in the flow table test performed on the sample 30 minutes after preparation.

[0084] (9) In the powder composition according to any one of (1) to (8) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, T2(30;15) is 108 mm or more, where T2(30;15) is a flow value at 15 strokes in the flow table test performed on the sample 30 minutes after the preparation.

[0085] (10) In the powder composition according to any one of (1) to (9) above, when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is performed on the sample at 20°C in accordance with JIS-R5201, the difference between T2(30;15) and T2(30;0) (T2(30;15)-T2(30;0)) is in the range of 5 to 20 mm, where T2(30;15) is the flow value at 15 strokes in the flow table test performed on the sample 30 minutes after its preparation, and T2(30;0) is the flow value at 0 strokes in the flow table test performed on the sample 30 minutes after its preparation.

[0086] (11) In the powder composition according to any one of (1) to (10), when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) and a hand vane shear test is performed on the sample at 20°C in accordance with JGS 1411, T3(5) is 1.5 to 5 kPa, where T3(5) is a shear yield value of the hand vane shear test performed on the sample 5 minutes after preparation.

[0087] (12) In the powder composition according to any one of (1) to (11), when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) and a hand vane shear test is performed on the sample at 20°C in accordance with JGS 1411, the sample has a shear yield value of T3(30) of 3.0 to 8.0 kPa, where T3(30) is a shear yield value of the hand vane shear test performed on the sample 30 minutes after the sample was prepared.

[0088] (13) In the powder composition according to any one of (1) to (12), when a paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a hand vane shear test is performed on the sample at 20°C in accordance with JGS 1411, the difference between T3(30) and T3(5), i.e., T3(30) - T3(5), is in the range of 1.5 to 6.5 kPa, where T3(30) is the shear yield value of the hand vane shear test performed on the sample 30 minutes after preparation, and T3(5) is the shear yield value of the hand vane shear test performed on the sample 5 minutes after preparation.

[0089] (14) In the powder composition according to any one of (1) to (13) above, the binder (A) comprises a cement component (A1) selected from the group consisting of ordinary Portland cement, moderate-heat Portland cement, low-heat Portland cement, high-early-strength Portland cement, sulfate-resistant Portland cement, blast-furnace cement, and fly ash cement.

[0090] (15) In the powder composition described in (14) above, the binder (A) further contains an admixture (A2) selected from the group consisting of fly ash, ground granulated blast furnace slag, ground limestone, stone powder, silica fume and an expansive agent.

[0091] (16) In the powder composition according to any one of (1) to (15) above, the fine aggregate (B) comprises one or more components selected from the group consisting of sand, mountain sand, land sand, sea sand, silica sand, crushed sand, and slag fine aggregate.

[0092] (17) A mortar material for additive manufacturing, comprising the powder composition according to any one of (1) to (16) above, and water added thereto.

[0093] (18) The mortar material for additive manufacturing according to (17) above, wherein the amount of the water is 12.0 to 18.0 parts by mass per 100 parts by mass of the powder composition.

[0094] (19) A mortar material for additive manufacturing, comprising cement (A), fine aggregate (B), an admixture (C) that imparts thixotropy, and water.

[0095] (20) The additive manufacturing mortar material according to any one of (17) to (19) above, wherein when the additive manufacturing mortar material is subjected to a slump test in accordance with JIS A 1171 at 20°C, the state in which T1(X) is 0 cm or more and 6 cm or less is maintained for at least 15 minutes, where T1(X) is the slump value of the slump test at a predetermined time.

[0096] (21) A mortar material for additive manufacturing according to any one of (17) to (20) above, wherein when the mortar material for additive manufacturing is subjected to a flow table test in accordance with JIS-R5201 at 20°C, the state in which T2(X;0) is 100 mm or more and 120 mm or less is maintained for at least 15 minutes, where T2(X;0) is the flow value at 0 strokes in the flow table test at a predetermined time.

[0097] (22) The additive manufacturing mortar material according to any one of (17) to (21) above, wherein when the additive manufacturing mortar material is subjected to a flow table test in accordance with JIS-R5201 at 20°C, the state in which T2(X;15) is 110 mm or more and 140 mm or less is maintained for at least 15 minutes, where T2(X;15) is the flow value of 15 strokes in the flow table test at a predetermined time.

[0098] (23) The additive manufacturing mortar material according to any one of (17) to (22) above, wherein when the additive manufacturing mortar material is subjected to a hand vane shear test in accordance with JGS 1411 at 20°C, the state in which T3(X) is 1.0 kPa or more and 8.0 kPa or less is maintained for at least 15 minutes, where T3(X) is the shear yield value of the hand vane shear test at a predetermined time.

[0099] (24) A shaped object, comprising a hardened mortar material for additive manufacturing according to any one of (17) to (23) above.

[0100] (25) A method for manufacturing a molded object, comprising the steps of: preparing a mortar material for additive manufacturing according to any one of (17) to (23) above; molding the mortar material for additive manufacturing by an additive manufacturing method; and hardening the molded mortar material for additive manufacturing. Of course, this is not the case.

[0101] Alternatively, the present invention may be provided in the following manner.

[0102] (α1) A powder composition used to produce a mortar material for additive manufacturing, The present invention comprises a binder (A), a fine aggregate (B), and an admixture (C) that imparts thixotropy, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and when a slump test is carried out on the sample at 20°C in accordance with JIS A 1171, T1(5) is 2 cm or less, where T1(5) is the slump value of the slump test performed on the sample 5 minutes after preparation, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. When this test is carried out, T2(5;0) is 100 mm or more. Here, T2(5;0) is the flow value at 0 stroke of the flow table test performed on the sample 5 minutes after the time of preparation, powder composition.

[0103] According to the powder composition (α1) described above, a mortar material having excellent moldability and lamination properties can be easily obtained.

[0104] (α2) A powder composition used to produce a mortar material for additive manufacturing, The present invention comprises a binder (A), a fine aggregate (B), and an admixture (C) that imparts thixotropy, The binder (A) contains ground granulated blast furnace slag, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and when a hand vane shear test is performed on the sample at 20°C in accordance with JGS 1411, T3(5) is 2.0 kPa or more, wherein T3(5) is the shear yield value of the hand vane shear test performed on the sample 5 minutes after preparation.

[0105] According to the powder composition (α2) described above, a mortar material having excellent moldability and strength of the hardened product can be easily obtained.

[0106] (α3) A powder composition used to produce a mortar material for additive manufacturing, The present invention comprises a binder (A), a fine aggregate (B), and an admixture (C) that imparts thixotropy, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. The difference between T2(30;15) and T2(30;0) (T2(30;15)-T2(30;0)) is in the range of 5 to 20 mm, Here, T2(30;15) is the flow value at 15 strokes in the flow table test performed on the sample 30 minutes after the time of preparation, and T2(30;0) is the flow value at 0 strokes in the flow table test performed on the sample 30 minutes after the time of preparation, powder composition.

[0107] According to the powder composition (α3) described above, a mortar material having a long pot life and excellent moldability can be easily obtained.

[0108] Incidentally, for each of the powder compositions (α1) to (α3) described above, the various configurations described above may be adopted within the scope of compatibility.

[0109] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various configurations other than those described above can be adopted. Furthermore, the present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of the present invention are included in the present invention. EXAMPLES

[0110] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples (test examples).

[0111] <<Experimental Group A>> [Raw materials used] First, we will explain the raw materials used in this experiment group A. The various raw materials used in this example are as follows. (1) Portland cement: Ordinary Portland cement (Blaine specific surface area 4440 cm 2 / g) (2) Ground granulated blast furnace slag: Ground granulated blast furnace slag (density: 2.91 g / cm3 , Specific surface area: 8000cm 2 / g) (3) Silica fume: Silica fume (density: 2.25 g / cm 3 , Specific surface area: 2000000cm 2 / g; "MasterLife (registered trademark) SF 610" manufactured by Pozzolith Solutions, Inc. (4) Inorganic expanding material: Lime composite expanding material (Denka Power CSA manufactured by Denka Co., Ltd.) (5) Fine aggregate: No. 4 silica sand (water absorption rate 0.87%) (6) Thickener: Methylcellulose-based thickener, the raw material used is in powder form (7) Rheology modifier 1: Polycarboxylic acid type, the raw material used is in powder form ("Coaflow NF-100" manufactured by Pacific Cement Corporation) (8) Short fibers: nylon fibers (fiber length: 10 mm) (9) Moisturizer: Urea

[0112] [Preparation of powder composition] Various raw materials were mixed according to the formulations shown below to prepare powder compositions according to Test Examples 1 to 4. Specifically, each component was mixed for 5 minutes using a Hobart mixer to obtain a powder composition. <Test Examples 1 and 3> Portland cement: 70 parts by weight Ground granulated blast furnace slag: 20 parts by weight Silica fume: 8.5 parts by weight Inorganic expanding agent: 1.5 parts by weight Fine aggregate: 100% by volume of the total binder Rheology modifier 1: 0.160% by weight based on the total weight of the binder Short fibre: 0.2% by volume based on the total volume of binder and fine aggregate Moisturizing agent: 1.4% by weight based on the total weight of the binder <Test Examples 2 and 4> Portland cement: 70 parts by weight Ground granulated blast furnace slag: 20 parts by weight Silica fume: 8.5 parts by weight Inorganic expanding agent: 1.5 parts by weight Fine aggregate: 100% by volume of the total binder Viscosifier: 0.070% by weight based on the total weight of binder and fine aggregate Rheology modifier 1: 0.160% by weight based on the total weight of the binder Short fibre: 0.2% by volume based on the total volume of binder and fine aggregate Moisturizing agent: 1.4% by weight based on the total weight of the binder

[0113] [Preparation of mortar materials] A predetermined amount of tap water was added to 3.0 kg of the obtained powder composition, and the mixture was mixed in a Hobart mixer at low speed (paddle rotation speed: 140 rpm, paddle revolution speed: 62 rpm) for 1 minute, the mortar that had once adhered to the paddle was scraped off, and the mixture was mixed again at high speed (paddle rotation speed: 285 rpm, paddle revolution speed: 125 rpm) for 2 minutes to obtain a mortar material. In Test Examples 1 and 2, 15% by mass of tap water was added based on the total mass of the binder and fine aggregate, and in Test Examples 3 and 4, 17% by mass of tap water was added based on the total mass of the binder and fine aggregate. The obtained mortar material was evaluated according to the following test items 5 minutes after preparation.

[0114] [Test 1: Slump test (JIS A 1171)] The kneaded mortar paste was filled into the slump cone in two layers. When filling, each layer was poked 15 times with a ram to pack the paste so that there were no gaps. After filling, the top surface was scraped flat and the cone was quickly removed. Immediately after removing the cone, the settled part of the paste was measured with a scale. Table 1 lists the evaluation value of the mortar material for each test example as the "mortar slump value." The lower this test value, the better the layering property when used in an additive manufacturing process.

[0115] [Test 2: Flow table test (JIS R 5201)] The kneaded mortar paste was filled into the flow cone in two layers. When filling, each layer was poked with a poker 15 times to pack the paste so that there were no gaps. After filling, the top surface was scraped to make it flat, and the cone was quickly removed. The diameter of the bottom surface was measured at only two points (orthogonal diameter). The maximum value of the measured value was taken as the flow value at 0 hits. Next, the sample was dropped at 1 cm per second, and this was repeated 15 times, after which the diameter of the bottom surface was measured at two points (orthogonal diameter). The maximum value of the measured value was taken as the flow value at 15 hits. In Table 1, the evaluation value of the mortar material of each test example is listed as the "mortar flow value". The difference between the mortar flow value at 15 hits and the mortar flow value at 0 hits is listed as the "flow spread amount". The smaller the mortar flow value at 0 hits, the better the lamination property can be when used in an additive manufacturing process. In addition, the mortar flow value at 15 strokes and the amount of flow spread can contribute to pumpability and fluidity when used in additive manufacturing processes, the greater the value.

[0116] [Test 3: Hand vane shear test (JGS 1411)] The kneaded mortar paste was divided into two layers and filled into a metal container. When filling, each layer was poked 10 times with a ram or the outer circumference was struck with a wooden hammer to pack the paste so that there were no voids. After filling, a metal cross blade attached to a torque wrench was inserted into the paste and rotated at a speed of 6 rpm. The maximum torque value was recorded, and the disturbed paste was made to flow again and smoothed out. This series of steps was repeated only twice, and the maximum value was taken as the shear yield value. Table 1 lists the evaluation value of the mortar material for each test example as the "shear yield value". The higher this test value, the better the lamination property when used in an additive manufacturing process.

[0117] [Table 1]

[0118] As shown in Table 1, the mortar material prepared using the powder composition of Test Example 2 had an excellent balance between lamination properties and pumpability and fluidity.

[0119] <<Experimental Group B>> Next, powder compositions of Examples 1 to 3 and Comparative Examples 1 to 3 having the formulations shown in Table 2 were prepared. Note that Example 1 in Table 2 has the same composition as Test Example 2 in Experimental Group A, but in Table 2 the amounts of various components are shown in parts by mass. Similarly, Comparative Example 1 in Table 2 has the same composition as Test Example 1 in Experimental Group A. Furthermore, Comparative Example 2 imitates the composition disclosed in Patent Document 1, and Comparative Example 3 imitates the composition disclosed in Patent Document 2. Note that in Table 2, the total binder (A) is taken as 100 parts by mass, and the parts by mass of the other components are calculated.

[0120] The raw materials not used in experimental group A are as follows: (10) High-early-strength Portland cement: High-early-strength Portland cement (Blaine specific surface area 4440 cm 2 / g) (11) Fly ash (12) Gypsum: "D-101A" manufactured by Noritake Company Limited (13) Calcium hydroxide: slaked lime (14) Alkali metal sulfate: Sodium sulfate (15) No. 5 silica sand (16) No. 6 silica sand (17) Thixotropic agent: "Associative thickener Thixostar" manufactured by Japan Material Technology Co., Ltd. (18) Rheology modifier 2: Melamine-based powder water reducer ("Melment" manufactured by BASF Japan) (19) Rheology modifier 3: Polycarboxylic acid dispersant ("Viscocrete-225P" manufactured by Sika Japan) (20) Defoamer: Polyether-based defoamer ("SN DEFORMER 14HP" manufactured by San Nopco Ltd.)

[0121] The various raw materials shown in Table 2 were mixed in accordance with the method shown in Experimental Group A to prepare a powder composition. The obtained powder composition was used to prepare a mortar material in accordance with the method shown in Experimental Group A. The amount of water shown in Table 2 was used to prepare the mortar material (the amount of water in a given proportion relative to 100 parts by mass of the total of the binder (A) and the fine aggregate (B) is shown in Table 2).

[0122] The mortar material thus obtained was subjected to test values ​​according to the methods of tests 1 to 3 shown in Experimental Group A. Note that, in Experimental Group A, only data was shown 5 minutes after the mortar material was prepared, but in Experimental Group B, data was shown 5 minutes after the mortar material was prepared. half an hour Data were also collected over time, and the results are shown in Table 2.

[0123] [Table 2]

[0124] In the present experimental group B, it was impossible to carry out the test 1 in the comparative example 3. Fig. 1 is a photograph showing the results of the slump test. This Fig. 1 shows the preparation of samples in the slump test of the later-described test example 5 and the comparative example 3. The mortar material prepared in the comparative example 3 was broken when it was removed from the slump cone, probably because of its too high viscosity.

[0125] As suggested by this experimental group B, the powder composition in each example gives good test values ​​when mixed with a predetermined amount of water to obtain a mortar material. From this, it is expected that the powder composition in each example is useful for additive manufacturing processes. The powder composition shown in Comparative Example 2 is considered to be a composition that improves pumpability on the premise that a certain amount of water is added. That is, when the amount of water shown in Table 2 is added, the value of T2(5;15) is not good, and when excessive water is added, there is a concern that the physical properties as a hardened material will decrease. For this reason, the powder composition of this example is considered to be a material with higher usability. The composition disclosed in Patent Document 3 is also considered to have a similar tendency to Comparative Example 2. Furthermore, even in Comparative Example 3, which imitates the formulation of Patent Document 2, the result of the slump test was not good, and the usability was poor.

[0126] <<Experimental Group C>> As Test Example 5, a powder composition was obtained by adjusting the composition of Test Example 2 and the amount of added water. Specifically, the powder composition of Test Example 5 was prepared according to the following recipe. The materials used were the same as those shown in Experimental Group A.

[0127] <Test Example 5> Portland cement: 25 parts by weight Ground granulated blast furnace slag: 75 parts by weight ·Fine aggregate: 100 parts by mass Thickener: 0.02 parts by weight Short fibers: 0.65 parts by weight

[0128] The powder composition thus obtained was used to obtain a mortar material according to the method described in [Preparation of mortar material]. Note that in this experimental group C, the amount of water added was 20% by mass relative to the total mass of the binder and fine aggregate.

[0129] The obtained mortar material was subjected to various tests in the same manner as in Experimental Group B. The results are shown in Table 3.

[0130] [Table 3]

[0131] The mortar material shown in Test Example 5 had various physical properties that were significantly different from those of Test Example 2, etc. This suggests that various test values ​​can be varied by adjusting the material mix of the powder composition, etc.

Claims

1. 1. A powder composition used to produce a mortar material for additive manufacturing, comprising: The present invention comprises a binder (A), a fine aggregate (B), and an admixture (C) that imparts thixotropy, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a slump test is carried out on the sample at 20° C. in accordance with JIS A 1171. When this slump test is carried out on the sample at 20° C., T1(5) is 2 cm or less, where T1(5) is the slump value of the slump test performed on the sample 5 minutes after preparation, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. When this test is carried out, T2(5;15) is 110 mm or more. wherein T2(5;15) is the flow value at 15 strokes of the flow table test performed on the sample 5 minutes after preparation.

2. The powder composition according to claim 1, The admixture (C) that imparts thixotropy is a powder composition containing one or more components selected from the group consisting of cellulose, modified cellulose, minerals, nanofibers, synthetic fibers, urethane, xanthan gum, diutan gum, starch ether, guar gum, polyacrylamide, carrageenan gum, agar, protein, and latex.

3. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B). When a slump test is carried out on the sample at 20°C in accordance with JIS A 1171, the difference between T1(5) and T1(30) (T1(5)-T1(30)) is in the range of 0.1 to 1.8 cm, Here, T1(5) is the slump value of the slump test performed on the sample 5 minutes after its preparation, and T1(30) is the slump value of the slump test performed on the sample 30 minutes after its preparation.

4. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. When this test is carried out, T2(5;0) is less than 110 mm. wherein T2(5;0) is the flow value at 0 stroke of the flow table test performed on the sample 5 minutes after preparation.

5. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. The difference between T2(5;15) and T2(5;0) (T2(5;15)-T2(5;0)) is in the range of 5 to 40 mm. wherein T2(5;15) is the flow value at 15 strokes in the flow table test performed on the sample 5 minutes after its preparation, and T2(5;0) is the flow value at 0 strokes in the flow table test performed on the sample 5 minutes after its preparation, powder composition.

6. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. When this test is carried out, T2(30;0) is less than 108 mm. Here, T2(30;0) is the flow value at 0 stroke of the flow table test performed on the sample 30 minutes after the time of preparation, powder composition.

7. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. When the flow table test is carried out on the sample at 20°C in accordance with JIS-R5201, T2(30;15) is 108 mm or more, wherein T2(30;15) is the flow value at 15 strokes of the flow table test performed on the sample 30 minutes after preparation.

8. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a flow table test is carried out on the sample at 20°C in accordance with JIS-R5201. The difference between T2(30;15) and T2(30;0) (T2(30;15)-T2(30;0)) is in the range of 5 to 20 mm. Here, T2(30;15) is the flow value at 15 strokes in the flow table test performed on the sample 30 minutes after the time of preparation, and T2(30;0) is the flow value at 0 strokes in the flow table test performed on the sample 30 minutes after the time of preparation, powder composition.

9. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and when a hand vane shear test is performed on the sample at 20°C in accordance with JGS 1411, T3(5) is 1.5 to 5 kPa; wherein T3(5) is the shear yield value of the hand vane shear test performed on the sample 5 minutes after preparation.

10. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and when a hand vane shear test is performed on the sample at 20°C in accordance with JGS 1411, T3(30) is 3.0 to 8.0 kPa; wherein T3(30) is the shear yield value of the hand vane shear test performed on the sample 30 minutes after preparation.

11. The powder composition according to claim 1, A paste-like sample is prepared by adding 15 parts by mass of water to 100 parts by mass of the total of the binder (A) and the fine aggregate (B), and a hand vane shear test is carried out on the sample at 20°C in accordance with JGS 1411. The difference between T3(30) and T3(5) (T3(30) - T3(5)) is in the range of 1.5 to 6.5 kPa. wherein T3(30) is the shear yield value of the hand vane shear test performed on the sample 30 minutes after preparation, and T3(5) is the shear yield value of the hand vane shear test performed on the sample 5 minutes after preparation.

12. The powder composition according to claim 1, The binder (A) is a powder composition comprising a cement component (A1) selected from the group consisting of ordinary Portland cement, moderate-heat Portland cement, low-heat Portland cement, high-early-strength Portland cement, sulfate-resistant Portland cement, blast-furnace cement, and fly ash cement.

13. The powder composition according to claim 12, The binder (A) further contains an admixture (A2) selected from the group consisting of fly ash, ground granulated blast furnace slag, ground limestone, stone powder, silica fume and an expansive agent.

14. The powder composition according to claim 1, The fine aggregate (B) is a powder composition containing one or more components selected from the group consisting of sand, mountain sand, land sand, sea sand, silica sand, crushed sand, and slag fine aggregate.

15. 1. A mortar material for additive manufacturing, comprising: A mortar material for additive manufacturing, comprising the powder composition according to any one of claims 1 to 14, and water added to the powder composition.

16. 16. The additive manufacturing mortar material according to claim 15, The amount of water is 12.0 to 18.0 parts by weight per 100 parts by weight of the powder composition.

17. A sculpture, A shaped object comprising a hardened additive manufacturing mortar material according to claim 15.

18. A method for manufacturing a shaped object, comprising the steps of: Providing an additive manufacturing mortar material according to claim 15; shaping the additive manufacturing mortar material by additive manufacturing; and hardening the shaped mortar material for additive manufacturing.

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