JP2014042990A - Manufacturing method of extruded cement plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an extruded cement plate of which strength and durability are hardly impaired, with an inexpensive material and simple equipment.SOLUTION: The method for manufacturing an extruded cement plate includes the steps of forming a molded object having a hollow hole by extrusion molding of a hydraulic molding composition and supplying curable material to the hollow hole. The hydraulic molding composition has a slump loss S of 5 mm or less measured by a slump test using a slump cone 50 having an inner diameter of the top end (R1) of 50 mm, an inner diameter of the bottom end (R2) of 100 mm, and a height (H1) of 150 mm. The curable material has a slump loss S of 50 to 130 mm measured by the slump test.

Description

  The present invention relates to a method for producing an extruded cement board that can be used for building materials and the like.

  Conventionally, an extruded cement board 1 formed by extruding cement, plaster or the like as shown in FIGS. 5 (a) and 5 (b) has been used for various building materials such as outer walls and partition walls of buildings. Yes. Moreover, as shown in FIG.5 (c), (d), by forming the hollow hole 3 in the extrusion cement board 1, weight reduction of an extrusion cement board 1 can be achieved, or heat insulation can be improved. Has been done. 5 (a) and 5 (c) are a part of a cross section cut along the extrusion direction of the extruded cement plate 1, and (b) and (d) are in a direction orthogonal to the extrusion direction of the extruded cement plate 1. A part of the cross section cut along is shown.

  Furthermore, for the purpose of improving the performance of the extruded cement board such as strength, fire resistance and heat insulation, various extruded cement boards 1 having a reinforcing material and methods for producing the same have also been proposed. For example, a molded body having a hollow hole 3 is extruded and a foamed cement is supplied to the hollow hole 3 to form a molded body filled with the foamed cement in the hollow hole 3, which is cured and cured and extruded. A method for obtaining a cement board 1 has been proposed (see, for example, Patent Document 1). As shown in FIG. 5 (e), the extruded cement board 1 obtained by this method has foamed concrete (bubble containing concrete) formed by hardening foamed cement in the hollow holes 3. Is formed as the core material 6. The core material 6 can serve as a reinforcing material.

JP-A-61-92808

  However, when the extruded cement plate 1 having the above-described foamed concrete as the core material 6 is manufactured, if the foam cement supplied to the hollow hole 3 is not filled in the hollow hole 3 without a gap, the core material 6 and the molding are formed. There may be gaps between the body. In such a case, the strength and durability of the extruded cement plate 1 were impaired. That is, as in the method disclosed in Patent Document 1, the conventional method for manufacturing the extruded cement plate 1 does not consider the filling property of the foamed cement supplied to the hollow holes 3 and is thus obtained. Extruded cement board 1 did not have sufficient strength and durability. Here, in order to improve the above filling property, for example, the fluidity of the raw material (hydraulic molding material) for forming the molded body having the hollow hole 3 and the foamed cement may be close. Conceivable. However, in this case, the strength of the molded body itself is greatly reduced, and it is difficult to say that an extruded cement board 1 having desired strength and durability can be obtained.

  The present invention has been made in view of the above points, and can be manufactured with an inexpensive material and simple equipment, and to obtain an extruded cement board that is excellent in appearance and hardly loses strength and durability. It aims at providing the manufacturing method of an extrusion cement board.

  The method for producing an extruded cement plate of the present invention includes a step of forming a molded body having hollow holes by extruding a hydraulic molding material, and a step of supplying a curable material to the hollow holes, The hard molding material has a slump loss value measured by a slump test using a slump cone having an upper end inner diameter of 50 mm, a lower end inner diameter of 100 mm and a height of 150 mm, and the curable material is measured by the slump test. The slump loss value is 50 to 130 mm.

  In the method for producing an extruded cement board, the curable material is preferably a cement slurry containing bubbles.

  Further, in the above method for producing an extruded cement plate, the curable material is supplied to the hollow hole from a core mold provided in a die part of an extruder, thereby extruding the molded body, It is preferable to supply the curable material to the hollow holes.

  According to the method for producing an extruded cement board of the present invention, the slump loss values of the hydraulic molding material and the curable material are 5 mm or less and 50 to 130 mm, respectively. The strength and durability of the extruded cement board are not easily impaired. In addition, by setting the slump loss value of the curable material within the above range, it becomes easy to ensure the quality of the extruded cement plate regardless of the material type. The board can be manufactured.

It is explanatory drawing which shows an example of the slump test method implemented in manufacturing an extrusion cement board, (a) thru | or (c) respectively show the perspective view, front view, and top view (top view) of a slump cone. (D) is sectional drawing of a slump cone when a slump cone is filled with a raw material, (e) is a schematic diagram showing a state of a raw material when the slump cone is pulled up in (d). It is the schematic which shows an example of embodiment of the manufacturing method of the extruded cement board of this invention, and demonstrates the manufacturing flow of an extruded cement board. It is sectional drawing which shows a part of process of the manufacturing method of an extrusion cement board same as the above, and shows a mode that a molded object is extrusion-molded from the nozzle | cap | die part of an extruder. It is sectional drawing which shows an example of the extrusion cement board manufactured by the manufacturing method of an extrusion cement board same as the above, (a) is a cut surface when cut | disconnecting along an extrusion direction, (b) is a direction perpendicular | vertical to an extrusion direction. The cut surface when cut is shown. A conventional example is shown, (a) and (b) are sectional views of an extruded cement plate, (c) and (d) are sectional views of an extruded cement plate having a hollow hole, and (e) is an extruded cement having a core material. It is a perspective view which shows a part of board.

  Hereinafter, modes for carrying out the present invention will be described.

  In the method for producing an extruded cement plate according to the present invention, the step of forming the molded body 4 having the hollow holes 3 by extruding the hydraulic molding material 2 and the step of supplying the curable material 5 to the hollow holes 3 are performed. Including. As shown in FIG. 4 to be described later, an extruded cement board 1 in which a core material 6 formed by curing the curable material 5 supplied to the hollow hole 3 is formed by the manufacturing method having such steps.

  Further, the hydraulic molding material 2 and the curable material 5 are prepared so that the slump loss value S (hereinafter referred to as the slump loss value S) is 5 mm or less and 50 to 130 mm, respectively. The slump loss value S is an index indicating the fluidity of a curable raw material such as a cement material.

  Here, the slump test method for measuring the slump loss value S will be described in detail.

  1A to 1C show the shape of the slump cone 50 used for the slump test. As can be seen from FIG. 1, the slump cone 50 is formed in such a shape that the cone is cut at a predetermined height position by a plane parallel to the bottom surface, and a portion above the cut surface is extracted. Yes. Therefore, as shown in FIG.1 (b), the side view cross-sectional shape of the slump cone 50 is a substantially trapezoid. Further, the slump cone 50 has a cavity 55 formed therein, and an opening surface is formed above and below the slump cone 50 so that the cavity 55 communicates with the outside air. Accordingly, as shown in FIG. 1C, the slump cone 50 is formed in a cylindrical shape having a substantially circular cross section with an upper end surface and a lower end surface opened. In FIG. 1, the upper opening surface of the slump cone 50 is an upper end opening portion 51, and the lower opening surface is a lower end opening portion 52. The slump cone 50 is different in size from the slump cone used in the slump test in JIS A1101 (2005), but its shape is the same.

  The inner diameter of the upper end opening 51 (referred to as the upper end inner diameter R1) and the inner diameter of the lower end opening 52 (referred to as the lower end inner diameter R2) are 50 mm and 100 mm, respectively. The upper end inner diameter R1 and the lower end inner diameter R2 refer to the diameters of only the space portions of the upper end opening 51 and the lower end opening 52, respectively, and exclude the thickness of the edge of the slump cone 50.

  On the other hand, the height H1 of the slump cone 50 (planar distance between the upper end opening 51 and the lower end opening 52) is 150 mm. It should be noted that the upper end inner diameter R1, the lower end inner diameter R2, and the height H1 of the slump cone 50 have no problem even if there is an error of about several millimeters (for example, an error within 1 mm) from the above numerical values.

  The slump cone 50 may be formed with a pair of handle portions 53 and 53 symmetrically on the side surface thereof. This is because the operation of pulling up the later-described slump cone 50 can be performed easily.

  The slump cone 50 can be made of metal, plastic, earthenware, glass or the like, but is preferably made of metal.

  A procedure for performing a slump test using the slump cone 50 will be described with reference to FIGS. In the present invention, the slump test is performed using the slump cone 50 in accordance with JIS A1101 (2005). That is, except that the dimensions of the slump cone 50 are different, the conditions are the same as the slump test by the measurement method based on the above JIS. Specifically, first, the slump cone 50 is placed on a horizontal and smooth table, for example, a plate-shaped table so that the lower end opening 52 is disposed on the lower side and the upper end opening 51 is disposed on the upper side. When the slump cone 50 is placed, the higher the water tightness, the better. That is, when the slump cone 50 is placed on a flat plate, it is preferable that the water has a water tightness that does not leak to the outside of the slump cone 50 even if water flows into the cavity 55.

  Next, the raw material (referred to here as the hydraulic molding material 2 or the curable material 5) is poured from the upper end opening 51 into the cavity 55 of the slump cone 50, and as shown in FIG. The internal cavity 55 is filled with the raw material. In this case, if the raw material is poured while stirring with a metal rod or the like, the hollow 55 can be filled with the raw material without involving air. Also, it is preferable to fill the raw material gradually by pouring the raw material into several times rather than pouring the raw material at once.

  When the raw material is filled into the slump cone 50, the upper surface of the raw material is made smooth according to the upper end of the slump cone 50. That is, the upper end opening 51 and the upper end surface of the raw material filled in the slump cone 50 are made to coincide. 1D shows a cross section of the slump cone 50 when the raw material is filled in the slump cone 50. In the drawing, in order to clarify the raw material filling state, The outer shape is represented by a broken line. Further, the handle 53 of the slump cone 50 is omitted.

  After filling the raw materials as described above, the slump cone 50 is pulled up vertically. In this pulling up, it is sufficient to pull up so that at least the lower end opening 52 is positioned above the height H1 of the slump cone 50. That is, the slump cone 50 may be pulled up by at least 150 mm.

  When the slump cone 50 is pulled up after the filling of the raw material is completed, the shape formed by filling the raw material (that is, the same shape as the hollow portion 55 of the slump cone 50) starts to collapse due to its own weight and changes from the original shape. become.

  FIG. 1 (e) schematically shows a state in which the shape has collapsed. Immediately before pulling up the slump cone 50, the height from the lower end to the upper end of the raw material is equal to the height H1 (150 mm) of the slump cone 50 as shown in FIG. Then, when the slump cone 50 is pulled up, the shape of the raw material begins to collapse, but eventually the collapse stops. The height H2 from the top to the bottom of the hydraulic material 2 when the collapse stops (hereinafter referred to as the collapse height H2), the difference between the height H1 in the original shape and the collapse height H2, That is, the value of H1-H2 is the slump loss value S.

  The slump loss value S measured as described above is an index representing the fluidity of the raw material filled in the slump cone 50. A large value indicates that the material has high fluidity, and this value is small. This indicates that the material has low fluidity.

  As the hydraulic molding material 2, an appropriate cement-based molding material can be used as long as it is prepared so that the slump loss value S is 5 mm or less. For example, the hydraulic molding material 2 contains cement, silica, reinforcing fibers, additives used as necessary, and water.

  As the cement, known cements such as Portland cement, blast furnace cement, and alumina cement can be used.

As silica, powder silica having a large specific surface area is preferably used. In this case, the toughness of the extruded cement plate 1 is improved. In particular, the specific surface area of silica is preferably 4000 cm ² / g or more. The proportion of silica in the hydraulic molding material 2 is not particularly limited as long as the slump loss value S of the hydraulic molding material 2 is adjusted to 5 mm or less.

  Examples of the reinforcing fibers include natural fibers such as pulp fibers, and synthetic fibers such as vinylon and polypropylene. Among these materials, only one kind may be used or two or more kinds may be used in combination. When pulp fibers are used, appropriate pulp fibers such as L-wood pulp, N-wood pulp, ramie pulp, and linter pulp can be used. The proportion of reinforcing fibers in the hydraulic molding material 2 is not particularly limited as long as the slump loss value S of the hydraulic molding material 2 is adjusted to 5 mm or less.

  The hydraulic molding material 2 may contain additives other than those described above. Examples of such additives include thickeners such as methylcellulose, ethylcellulose, and carboxymethylcellulose; lightweight materials such as resin-based hollow bodies, shirasu balloons, and pearlite; and powders such as fly ash. If the above thickener or lightening material is added, the slump loss value S can be easily set to a target value.

  The hydraulic molding material 2 can be prepared by, for example, dry-mixing the above-mentioned various materials, and further adding water and kneading with a kneader so that the slump loss value S is 5 mm or less. . For example, 45 parts by mass of cement, 45 parts by mass of silica, 9 parts by mass of reinforcing fibers (unbleached kraft pulp), 1 part by mass of a thickener, and 0.3 parts by mass of a weight-reducing material are dry-mixed, and water is further added to 50 parts. The hydraulic molding material 2 whose slump loss value S is 5 mm or less can be obtained by adding and mixing a mass part.

  On the other hand, as the curable material 5, any suitable cement-based molding material may be used as long as it is prepared so that the slump loss value S is 50 to 130 mm or less. Except that the slump loss value S is different, the material constituting the curable material 5 can be the same as the above-described material constituting the hydraulic molding material 2. However, if the curable material 5 contains reinforcing fibers, the supply to the hollow holes 3 becomes difficult, or the fluidity is deteriorated and the slump loss value S is easily deviated from the above range, so the reinforcing fibers are not included. Is preferred.

  In addition, since the curable material 5 is formed as a core material 6 in the extruded cement plate 1 when cured, the curable material 5 is a fine bubble (in the slurry mainly composed of cement or the like). Air). Hereinafter, what the curable material 5 is a cement slurry containing bubbles is referred to as “bubble-containing cement”. The bubble-containing cement may be generally referred to as foam cement or foam mortar.

  As the bubble-containing cement, a conventionally known material can be used. For example, the foam-containing cement contains cement, silica, other additives used as necessary, and water.

  Examples of the method for forming the bubbles in the slurry in the bubble-containing cement include a method of adding a foaming agent to the cement slurry. Examples of such foaming agents include Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Ga, Sn, Si, ferrosilicon and other metal powders, hydrogen peroxide, Examples thereof include peroxide powders such as sodium, potassium peroxide and sodium perborate, surfactants, and amphiphilic compounds such as proteins. Further, if necessary, a foaming aid may be used in combination. Examples of the foaming aid include porous powders such as silica gel, zeolite, activated carbon, and alumina gel, metal stearate, and metal palmitate. Metal soap such as salt can be used. The amount of the foaming agent or foaming aid added may be appropriately set according to the type and viscosity of the slurry or the target bubble size. If the above-mentioned foaming agent or foaming aid is added to the cement slurry and the cement slurry is stirred, bubbles can be formed in the cement slurry. In the case where the foaming agent is a surfactant, air bubbles can be contained in the cement slurry by previously forming air bubbles and then mixing it with the cement slurry. It is also possible to form bubbles using a commercially available homogenizer, mixing mill, ultrasonic irradiation device, etc. In this case, bubbles of the bubble-containing cement are more easily formed.

  A method for producing the extruded cement board 1 by the production flow shown in FIG. 2 will be described in detail below. FIG. 2 shows an example of a method for producing an extruded cement board, and is a schematic diagram for explaining a production flow for producing the extruded cement board 1.

  First, the hydraulic molding material 2 is supplied into the extrusion molding machine 21 from a raw material charging port 23 such as a hopper provided on one end side of the extrusion molding machine 21. The hydraulic molding material 2 supplied in this way is kneaded by a screw 22 provided in the extruder 21. What is necessary is just to set suitably the rotational speed etc. of the screw 22 according to the kind etc. of material. The hydraulic molding material 2 reaches the base part 30 on the other end side of the extrusion molding machine 21 while being kneaded, and then is discharged from the base part 30 and extruded to the outside of the extrusion molding machine 21 to form the molded body 4. Formed as. As the extrusion molding machine 21, a known machine can be used.

  In FIG. 3, the cross section of the nozzle | cap | die part 30 which can be used by manufacture of the extrusion cement board 1 is shown. The base part 30 is formed, for example, in a cylindrical shape, and further, a core mold 9 is provided inside the base part 30. An opening 10 serving as an outlet of the hydraulic molding material 2 is formed at one end of the base part 30. Since the core mold 9 is provided in the base portion 30, when the hydraulic molding material 2 is extruded to form the molded body 4, the hollow hole 3 is formed in the molded body 4. .

  The core mold 9 includes a base portion 11 that is fixed in the base portion 30 and a protruding portion 12 that protrudes from the base portion 11. The protruding portion 12 protrudes from the base portion 11 toward the opening 10. The number of the protrusions 12 may be one or plural. The number of protrusions 12 matches the number of hollow holes 3 formed in the molded body 4.

  A space 13 that communicates with the outside of the extrusion molding machine 21 is formed in the core mold 9, and a discharge port 14 that communicates with the space 13 is formed at the tip of the protrusion 12. . With such a configuration, as will be described later, the curable material 5 can be supplied to the space 13 from the outside of the extrusion molding machine 21, and the curable material 5 supplied to the space 13 is supplied to the discharge port 14. It becomes possible to discharge from.

  Since the extrusion molding machine 21 includes the die part 30 as described above, when the hydraulic molding material 2 is extruded, the hydraulic molding material 2 passes through the opening 10 from the die part 30 and the extrusion molding machine 21. The molded body 4 having a cross-sectional shape that matches the shape of the opening 10 is obtained. Furthermore, when the hydraulic molding material 2 moves in the base part 30, the hydraulic molding material 2 passes through the projecting part 12 in the base part 30, so that the molded body 4 has a hollow corresponding to the projecting part 12. Hole 3 is formed.

  In addition, the nozzle | cap | die part 30 used by this invention is not limited to the thing of said structure, There will be no restriction | limiting in particular if the hollow hole 3 can be formed in the molded object 4. FIG.

  The curable material 5 can be supplied to the hollow hole 3 of the molded body 4 by supplying the curable material 5 from the outside of the extrusion molding machine 21 to the space 13 in the core mold 9. Specifically, as shown in FIG. 2, first, the curable material 5 is accommodated in the stirring layer 24 provided outside the extruder 21 while being stirred by the stirrer 25. The curable material 5 is supplied to the space 13 of the core mold 9. The stirring layer 24 and the space 13 are connected by a supply pipe 26 such as a pipe, and the curable material 5 can be directly supplied from the stirring layer 24 to the space 13 through the supply pipe 26. Although supply of the curable material 5 is omitted in FIG. 2, a general-purpose metering pump may be used to supply the curable material 5 to the space 13 with a constant supply amount. The curable material 5 supplied to the space 13 is discharged from the discharge port 14 of the protrusion 12, and the curable material 5 is supplied into the hollow hole 3. Therefore, when the curable material 5 is supplied to the space 13, it is cured in the hollow hole 3 of the molded body 4 in parallel with the extrusion molding of the hydraulic molding material 2 to form the molded body 4. The material 5 can be supplied. Therefore, the molded body 4 formed by being discharged from the base portion 30 is pushed out in a state where the curable material 5 is injected into the hollow hole 3. The curable material 5 supplied to the hollow hole 3 is formed as a core material 6 when cured, but is in an uncured state immediately after being extruded.

  As shown in FIG. 2, the molded body 4 discharged from the base part 30 is transported by a transport means 27 such as a transport conveyor arranged in parallel on the discharge side of the extrusion molding machine 21, and is stacked on the stacking table 28. . The molded body 4 can be formed into a desired size by cutting it at a predetermined location before or after loading.

  By the way, the curable material 5 is not supplied to the space 13 of the core mold 9 as described above, but is directly supplied to the hollow hole 3 after forming the molded body 4 to a predetermined size, so-called post-injection. It is also possible to do. That is, when extrusion molding is performed without supplying the curable material 5 to the space 13 of the core mold 9, the molded body 4 containing no curable material 5 is formed in the hollow hole 3. It is also possible to supply the curable material 5 to the hollow hole 3 portion. In this case, for example, as indicated by a broken line arrow in FIG. 2, the curable material 5 can be directly supplied from the stirring layer 24 to the hollow hole 3 of the molded body 4 loaded on the loading table 28. Even in this supply, the curable material 5 can be supplied to the hollow hole 3 using a metering pump or the like as described above.

  In the manufacturing method of this embodiment, after forming the molded object 4 in which the sclerosing | hardenable material 5 is contained in the hollow hole 3 as mentioned above, it has the process of curing and hardening this. Through this curing and curing process, the curable material 5 is cured to form the core material 6, and the extruded cement board 1 is manufactured. The extruded cement board 1 may be press-molded as necessary. As a method for curing and curing the molded body 4, a known method such as steam curing can be adopted, and the curing and curing conditions are appropriately set. The method of press molding is not particularly limited, and the molding method and molding conditions are appropriately set.

  FIG. 4 shows a part of a cross section of the extruded cement plate 1 manufactured by the method of the above embodiment. The extruded cement board 1 is formed in a flat plate shape with a substantially rectangular shape in plan view, and the hollow holes 3 are formed in the extruded cement board 1 over the entire length of the molded body 4 in the extrusion direction. A plurality of hollow holes 3 are formed at a predetermined interval in a direction orthogonal to the extrusion direction. In this embodiment, the hollow hole 3 is formed with a substantially rectangular cross section. However, the hollow hole 3 is not limited to this shape, and may have other shapes. In order to change the shape of the hollow hole 3, the shape of the protruding portion 12 of the core mold 9 described above may be changed. And in each hollow hole 3, the core material 6 formed by hardening | curing the curable material 5 is arrange | positioned. When the above-mentioned bubble-containing cement is used as the curable material 5, a large number of bubbles derived from the bubble-containing cement are formed in the core material 6, so that it is formed as so-called foamed concrete. In this case, the entire weight of the extruded cement plate 1 can be reduced, and the fire resistance of the extruded cement plate 1 is further improved because the core material 6 has bubbles.

  Since the extruded cement board 1 as described above is formed using the hydraulic molding material 2 having a slump loss value S of 5 mm or less, the molded body 4 is formed in a very dense state. Therefore, since the molded body 4 has few voids, it has high water tightness, excellent weather resistance, and high strength and durability.

  Moreover, since the fluidity | liquidity of the curable material 5 becomes a thing suitable for filling by using the thing with the slump loss value S 50-130mm as the curable material 5, the hollow hole 3 of the curable material 5 to the hollow hole 3 becomes suitable. The filling property is particularly excellent. Therefore, even if the curable material 5 is supplied to the hollow hole 3, it becomes difficult to form a gap in the hollow hole 3. That is, the penetration of the curable material 5 into the molded body 4 is suppressed by supplying the curable material 5 having appropriate fluidity to the hollow holes of the molded body 4 formed more densely. The hollow hole 3 can be filled with the curable material 5 without a gap. Accordingly, even after the curable material 5 supplied to the hollow hole 3 is cured, the core material 6 is formed in a state in which gap formation is suppressed in the hollow hole 3, so that the obtained extruded cement plate 1 has a high fire resistance. And has excellent strength and durability. As described above, by combining the hydraulic molding material 2 and the curable material 5 having the slump loss value S in a specific range, the extruded cement board 1 in which fire resistance and durability are synergistically improved can be obtained. . When only one of the hydraulic molding material 2 and the curable material 5 does not satisfy the slump loss value S, the filling property to the hollow hole 3 is deteriorated, so that it is difficult to improve fire resistance and durability. .

  If the slump loss value S of the hydraulic molding material 2 exceeds 5 mm, the strength and durability of the molded body 4 are reduced, and the molded body 4 has many gaps. May also decrease. In addition, the hollow holes 3 may be deformed with respect to the original shape, and it is difficult to sufficiently fill the curable material 5, and the durability and fire resistance of the extruded cement board 1 may be impaired. . The lower limit value of the slump loss value S of the hydraulic molding material 2 is not particularly limited, but may be, for example, 1 mm or less, and the slump loss value S may be zero.

  Further, if the slump loss value S of the curable material 5 exceeds 130 mm, there may be a problem that the curable material 5 flows out after being injected into the hollow hole 3. On the other hand, if the slump loss value S of the curable material 5 is less than 50 mm, the fluidity of the curable material 5 is poor, so that the filling property into the hollow hole 3 is deteriorated, and the curable material 5 is removed with a metering pump or the like. Supply is also difficult, and manufacturing equipment may be complicated. Therefore, if the slump loss value S of the curable material 5 deviates from 50 to 130 mm, the fire resistance and durability of the obtained extruded cement board 1 may be impaired, and in addition, the production efficiency is also reduced. There is.

  Moreover, as long as the slump loss value S of the curable material 5 is set within the above range, the extruded cement plate 1 having high fire resistance and durability is manufactured regardless of the material type constituting the curable material 5. For example, it is also possible to select a material that is less expensive than the conventional one. Moreover, since the curable material 5 having the slump loss value S in the above range has high fluidity, even if the curable material 5 is supplied using a general-purpose metering pump, the pump is not easily clogged, which is easier than before. A small supply facility can be used. Thus, the total cost required to manufacture the extruded cement board 1 can be suppressed by using inexpensive materials and using simple and small equipment.

  The extruded cement board 1 manufactured by the above manufacturing method is excellent in fire resistance and durability, and can be manufactured at a lower cost than before by a simple method. It is also suitably used for building materials other than houses, for example, buildings such as stores and buildings.

  Hereinafter, the present invention will be specifically described by way of examples.

Example 1
45 parts by mass of cement, 45 parts by mass of silica, 9 parts by mass of reinforcing fibers, 1 part by mass of a thickener (Hi-Metroze SHV-PF manufactured by Shin-Etsu Chemical Co., Ltd.), and 0.3 parts by mass of a weight-reducing material are dry mixed. A hydraulic molding material was prepared by adding and mixing 50 parts by mass of water.

  On the other hand, 49 parts by mass of cement, 48 parts by mass of silica, and 3 parts by mass of the lightening material were dry-mixed, and 50 parts by mass of water was further added and mixed to prepare a curable material. Table 1 shows the slump loss values S of the hydraulic molding material and the curable material.

  And the extrusion cement board was manufactured by performing the extrusion molding by the manufacturing flow of FIG. The curable material was supplied to the core space.

  As for the die of the die part used for extrusion molding, the obtained extruded cement plate is formed with a rectangular hollow hole having a cross section of 20 mm × 20 mm as shown in FIG. 4, and the interval between adjacent hollow holes is 5 mm. The gap between the hole and the surface of the extruded cement plate and the distance between the hollow hole and the back surface of the extruded cement plate were each 5 mm.

(Example 2)
In the curable material, no lightweight aggregate is used, and 5 parts by weight of a surfactant (Fine Foam 707 manufactured by BASF Pozzolith Co., Ltd.) is added to water as a foaming agent, and a cellular material obtained by preforming this. Extruded cement board was produced in the same manner as in Example 1 except that 5 parts by mass of was added to form bubbles in the curable material. Table 1 shows the slump loss values S of the hydraulic molding material and the curable material.

(Comparative Examples 1-3)
Extruded cement boards were produced in the same manner as in Example 1 except that the slump loss values S of the hydraulic molding material and the curable material were changed as shown in Table 1. The slump loss value S was adjusted by changing the amount of water.

Table 1 shows the results of evaluating the dents, filling properties, and runoff resistance of the appearance of the extruded cement plates obtained in the examples and comparative examples. In addition, the evaluation method of the slump test and the extrusion cement board was performed by the method as described below.
(Slump test)
A metal slump cone having an upper end inner diameter R1 of 50 mm, a lower end inner diameter R2 of 100 mm, and a height H1 of 150 m was used. The test was conducted according to JIS A1101 (2005), and the measurement was performed with a pull-up time of 2 seconds.
(Appearance dent evaluation)
After hardening the extruded cement board, visually check the deformation of the surface side of the extruded cement board (upper side in the direction orthogonal to the extrusion direction) and the hollow hole dent, and evaluate the dent on the appearance based on the following criteria. did.
◯: An extruded cement board having a good appearance with no deformation or dent.
X: Deformation and a dent were seen and it was an extrusion cement board with a bad external appearance.
(Fillability evaluation)
The filling state of the curable material into the hollow holes was confirmed with the naked eye, and the filling property was evaluated based on the following criteria.
◯: The core material in the hollow hole was arranged with almost no gap formed, and was excellent in filling property of the curable material.
X: The core material in a hollow hole was arrange | positioned with a clearance gap, and was a thing with a bad filling property of a curable material.
(Evaluation of spill resistance)
The presence or absence of the curable material injected into the hollow holes from the opening surface of the hollow holes was observed with the naked eye, and the resistance to outflow was evaluated based on the following criteria.
○: Little outflow of the curable material from the opening surface of the hollow hole was observed.
X: Outflow of the curable material from the opening surface of the hollow hole was observed.

  Since the extruded cement plates of Examples 1 and 2 from Table 1 are formed with a predetermined slump loss value S of the hydraulic molding material and the curable material, the appearance is good, and the curable material The filling property was also excellent. On the other hand, the extruded cement plates of Comparative Examples 1 and 2 are those in which the slump loss value S of one or both of the hydraulic molding material and the curable material is out of the predetermined range. Any of the worsening was seen. Further, in Comparative Example 3, since the slump loss value S of the curable material was too small, supply to the hollow holes was difficult, and the target extruded cement plate could not be obtained.

DESCRIPTION OF SYMBOLS 1 Extruded cement board 2 Hydraulic molding material 3 Hollow hole 4 Molded body 5 Hardenable material 9 Core type 21 Extruder 30 Cap part 50 Slump cone R1 Upper end inner diameter R2 Lower end inner diameter S Slump loss value

Claims (3)

Including a step of forming a molded body having a hollow hole by extruding a hydraulic molding material, and a step of supplying a curable material to the hollow hole,
The hydraulic molding material has a slump loss value of 5 mm or less measured by a slump test using a slump cone having an upper end inner diameter of 50 mm, a lower end inner diameter of 100 mm and a height of 150 mm,
The method for producing an extruded cement board, wherein the curable material has a slump loss value measured by the slump test of 50 to 130 mm.   The method for producing an extruded cement board according to claim 1, wherein the curable material is a cement slurry containing bubbles.   Supplying the curable material to the hollow hole while extruding the molded body by supplying the curable material to the hollow hole from a core mold provided in a die portion of an extruder. The manufacturing method of the extrusion cement board of Claim 1 or 2 characterized by the above-mentioned.

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