JP7545663B2 - Method for manufacturing a molded object, mortar composition for molding, and molded object - Google Patents
Method for manufacturing a molded object, mortar composition for molding, and molded object Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims description 59
- 239000004570 mortar (masonry) Substances 0.000 title claims description 50
- 238000000465 moulding Methods 0.000 title claims description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 23
- 239000000463 material Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000005507 spraying Methods 0.000 claims description 23
- 239000011344 liquid material Substances 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000004898 kneading Methods 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- 239000011398 Portland cement Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- -1 mountain sand Chemical compound 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004815 dispersion polymer Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000007589 penetration resistance test Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、造形物の製造方法、該製造方法に用いられる造形用モルタル組成物、及び、造形用モルタル組成物を硬化させてなる造形物に関する。 The present invention relates to a method for manufacturing a shaped object, a mortar composition for use in the manufacturing method, and a shaped object obtained by hardening the mortar composition for use in the manufacturing method.
例えば、テーマパーク、遊園地、公園等に設置される造形物は、金網、鉄筋、鉄骨等を用いて組み立てられた支持体を包むようにしてモルタル組成物を塗布した後、該モルタル組成物を所望の形状に造形して製造される（例えば、特許文献１）。 For example, structures installed in theme parks, amusement parks, public parks, etc. are manufactured by applying a mortar composition so as to encase a support assembled using wire mesh, reinforcing bars, steel frames, etc., and then molding the mortar composition into the desired shape (for example, Patent Document 1).
従来、比較的大きな造形物を製造する際には、湿式吹付け工法を用いて、モルタル組成物を支持体に吹付けている。湿式吹付け工法とは、セメントを含む粉体材料と水を含む液体材料とを予め混練したモルタル組成物をポンプ搬送し、吹付け用ノズルの先端で気体と共に対象物に吹付ける工法である。 Conventionally, when manufacturing relatively large objects, a mortar composition is sprayed onto a support using a wet spraying method. The wet spraying method is a method in which a mortar composition made by premixing a powder material containing cement and a liquid material containing water is pumped and sprayed onto the target object together with gas from the tip of a spraying nozzle.
しかしながら、湿式吹付け工法は、ポンプ圧送するために流動性の高い材料を使用しているため、吹付け厚さを厚くすることが難しく、また、粉体材料と液体材料とを予め混練したモルタル組成物をホースで圧送するため、長距離圧送ができないことに加えて、ホース内の洗浄が必要であるという問題が知られている。 However, the wet spraying method requires the use of highly fluid materials for pumping, making it difficult to achieve a thick spray thickness. In addition, because the mortar composition, which is a mixture of powder and liquid materials mixed in advance, is pumped through a hose, it is not possible to pump it over long distances, and it is known that the inside of the hose needs to be cleaned.
さらに、湿式吹付け工法を用いて造形物を製造する場合、造形可能な硬さになるまで時間を要し、かつ、造形可能な硬さを長時間維持することができないという問題がある。 Furthermore, when manufacturing objects using the wet spraying method, there is the problem that it takes time for the material to become hard enough to be molded, and that this hardness cannot be maintained for a long period of time.
本発明は、このような問題を解決するためになされたものであり、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持することが可能な造形物の製造方法、造形用モルタル組成物、及び、造形物を提供することを課題とする。 The present invention has been made to solve these problems, and aims to provide a method for manufacturing a molded object, a mortar composition for molding, and a molded object that can shorten the time it takes to reach a hardness that allows molding and maintain that hardness for a long period of time.
本発明に係る造形物の製造方法は、造形用モルタル組成物を用いて所望の形状に造形する造形物の製造方法であって、セメント及び骨材を含む粉体材料と、水を含む液体材料と、を吹付け用ノズル内で混練して造形用モルタル組成物を得た後、該造形用モルタル組成物を気体と共に支持体に吹付ける乾式吹付け工程を含み、前記骨材の吸水率が、７．５％以下である。 The method for manufacturing a molded object according to the present invention is a method for manufacturing a molded object in a desired shape using a mortar composition for molding, and includes a dry spraying process in which a powder material containing cement and aggregate and a liquid material containing water are mixed in a spray nozzle to obtain a mortar composition for molding, and then the mortar composition for molding is sprayed onto a support together with a gas, and the water absorption rate of the aggregate is 7.5% or less.
前記造形物の製造方法は、乾式吹付け工法を用いて、造形用モルタル組成物を支持体に吹付けていて、さらに、粉体材料に含まれる骨材の吸水率が７．５％以下であることにより、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持することができる。 The method for manufacturing the object uses a dry spraying method to spray the mortar composition for molding onto a support, and furthermore, the water absorption rate of the aggregate contained in the powder material is 7.5% or less, which shortens the time it takes for the composition to become hard enough to be molded, and allows the composition to maintain a hardness that allows it to be molded for a long period of time.
また、前記造形物の製造方法は、乾式吹付け工法を用いているため、吹付け厚さを厚くすることができ、さらに、長距離圧送が可能であることに加えて、ホース内の洗浄も不要である。 In addition, the manufacturing method for the object uses a dry spraying method, which allows for a thicker spray thickness, and in addition to allowing for long-distance pumping, there is no need to clean the inside of the hose.
本発明に係る造形物の製造方法は、前記粉体材料に対する前記液体材料の質量割合（液／粉体比）が、１０．０％以上２４．０％以下であってもよい。 In the method for manufacturing a molded object according to the present invention, the mass ratio of the liquid material to the powder material (liquid/powder ratio) may be 10.0% or more and 24.0% or less.
斯かる構成により、前記造形物の製造方法は、造形可能な硬さになるまでの時間をより短くすると共に、造形可能な硬さを長時間維持することができる。 With this configuration, the method for manufacturing the molded object can shorten the time it takes for the material to reach a hardness sufficient for molding, and can maintain that hardness for a long period of time.
本発明に係る造形物の製造方法は、前記造形用モルタル組成物の単位体積質量が、１．７０ｔ／ｍ３以上２．４０ｔ／ｍ３以下であってもよい。 In the method for producing a shaped object according to the present invention, the unit volume mass of the shaping mortar composition may be 1.70 t/ m3 or more and 2.40 t/ m3 or less.
斯かる構成により、前記造形物の製造方法は、造形可能な硬さになるまでの時間をより短くすると共に、造形可能な硬さを長時間維持することができる。 With this configuration, the method for manufacturing the molded object can shorten the time it takes for the material to reach a hardness sufficient for molding, and can maintain that hardness for a long period of time.
本発明に係る造形用モルタル組成物は、上述の造形物の製造方法に用いられる造形用モルタル組成物であって、セメント及び骨材を含む粉体材料と、水を含む液体材料と、を含み、前記骨材の吸水率が、７．５％以下である。 The mortar composition for molding according to the present invention is a mortar composition for molding used in the above-mentioned method for manufacturing a molded object, and contains a powder material containing cement and aggregate, and a liquid material containing water, and the water absorption rate of the aggregate is 7.5% or less.
前記造形用モルタル組成物は、粉体材料に含まれる骨材の吸水率が７．５％以下であることにより、乾式吹付け工法を用いて造形物を造形する際に、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持することができる。 The mortar composition for molding has an aggregate contained in the powder material with a water absorption rate of 7.5% or less, which shortens the time it takes for the composition to reach a hardness suitable for molding when molding an object using the dry spraying method, and allows the composition to maintain a hardness suitable for molding for a long period of time.
本発明に係る造形物は、上述の造形用モルタル組成物を硬化させてなる。 The shaped object according to the present invention is produced by hardening the above-mentioned mortar composition for molding.
前記造形物は、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持して製造することができる。 The object can be manufactured by shortening the time it takes for the material to reach a hardness suitable for molding, and by maintaining that hardness for a long period of time.
本発明に係る造形物は、単位体積質量が、１．７０ｔ／ｍ３以上２．４０ｔ／ｍ３以下であってもよい。 The shaped object according to the present invention may have a unit volume mass of 1.70 t/ m3 or more and 2.40 t/ m3 or less.
前記造形物は、造形可能な硬さになるまでの時間をより短くすると共に、造形可能な硬さをより長時間維持して製造することができる。 The object can be manufactured in a shorter time until it becomes hard enough to be molded, and at the same time, maintains its hardness for a longer period of time.
本発明によれば、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持することが可能な造形物の製造方法、造形用モルタル組成物、及び、造形物を提供することができる。 The present invention provides a method for manufacturing a molded object, a mortar composition for molding, and a molded object that can shorten the time it takes to reach a moldable hardness and maintain the moldable hardness for a long period of time.
以下、本実施形態に係る造形物の製造方法、造形用モルタル組成物、及び、造形物について説明する。 The method for manufacturing a molded object, the mortar composition for molding, and the molded object according to this embodiment are described below.
＜造形物の製造方法＞
本実施形態に係る造形物の製造方法は、セメント及び骨材を含む粉体材料と、水を含む液体材料と、を吹付け用ノズル内で混練して造形用モルタル組成物を得た後、該造形用モルタル組成物を気体と共に支持体に吹付ける乾式吹付け工程を含む。
<Method of manufacturing a molded object>
The manufacturing method of a molded object according to this embodiment includes a dry spraying process in which a powder material containing cement and aggregate and a liquid material containing water are mixed in a spraying nozzle to obtain a mortar composition for molding, and then the mortar composition for molding is sprayed onto a support together with a gas.
前記乾式吹付け工程は、乾式吹付け工法を用いて、造形用モルタル組成物を支持体に吹付ける工程である。具体的には、粉体材料をコンプレッサー（空気圧縮機）や空気送風機で製造された気体と共にホースで圧送して吹付け用ノズルへ供給し、該吹付け用ノズル内で液体材料と混練して造形用モルタル組成物を得た後、この造形用モルタル組成物を気体と共に高圧力で支持体に吹付ける。ここで、混練とは、気流中で粉体材料と液体材料とを充分に接触させて練り混ぜることをいう。 The dry spraying process is a process in which the shaping mortar composition is sprayed onto a support by using a dry spraying method. Specifically, the powder material is pressure-fed through a hose together with gas produced by a compressor (air compressor) or air blower, supplied to a spraying nozzle, and mixed with a liquid material in the spraying nozzle to obtain a shaping mortar composition, which is then sprayed onto a support together with the gas at high pressure. Here, "mixing" refers to thoroughly contacting and mixing the powder material and liquid material in an air stream.
粉体材料に含まれるセメントとしては、特に限定されるものではなく、市場で入手できる種々のセメントを用いることができる。具体的には、普通ポルトランドセメント、早強ポルトランドセメント等の各種ポルトランドセメント、高炉セメント、シリカセメント、フライアッシュセメント等の各種混合セメント、アルミナセメント、及び、超速硬セメント（例えば、カルシウムアルミネート系、カルシウムサルフォアルミネート系、カルシウムフルオロアルミネート系等）からなる群から選択される一つを用いてもよく、２種以上を混合して用いてもよい。セメントの配合量としては、特に限定されるものではなく、例えば、６５０ｋｇ／ｍ３以上１２００ｋｇ／ｍ３以下とすることができる。 The cement contained in the powder material is not particularly limited, and various cements available on the market can be used. Specifically, one selected from the group consisting of various Portland cements such as ordinary Portland cement and high-early-strength Portland cement, various mixed cements such as blast furnace cement, silica cement, and fly ash cement, alumina cement, and ultra-fast hardening cement (e.g., calcium aluminate, calcium sulfoaluminate, calcium fluoroaluminate, etc.) may be used, or two or more types may be mixed and used. The amount of cement to be mixed is not particularly limited, and can be, for example, 650 kg/ m3 or more and 1200 kg/ m3 or less.
粉体材料に含まれる骨材は、吸水率が７．５％以下である。骨材としては、例えば、山砂、川砂、陸砂、及び、海砂等の天然砂；砂岩、石灰岩等を人工的に破砕して形成された砕砂（より詳しくは、石灰砕砂等）；膨張性頁岩等を粉砕・造粒・焼成したものや真珠岩等を破砕・加熱発泡させた軽量骨材等が挙げられる。これらの骨材を単独で用いるか、２種以上を混合して用いることにより、骨材の吸水率を７．５％以下に調整することができる。骨材の吸水率は、０．２％以上であることが好ましく、６．０％以下であることが好ましい。骨材の配合量としては、特に限定されるものではなく、例えば、４７５ｋｇ／ｍ３以上１３００ｋｇ／ｍ３以下とすることができる。 The aggregate contained in the powder material has a water absorption rate of 7.5% or less. Examples of the aggregate include natural sand such as mountain sand, river sand, land sand, and sea sand; crushed sand (more specifically, crushed limestone sand, etc.) formed by artificially crushing sandstone, limestone, etc.; lightweight aggregates obtained by crushing, granulating, and burning expansive shale, etc., and crushing and heating and foaming perlite, etc. These aggregates can be used alone or in combination of two or more types to adjust the water absorption rate of the aggregate to 7.5% or less. The water absorption rate of the aggregate is preferably 0.2% or more, and preferably 6.0% or less. The amount of the aggregate to be mixed is not particularly limited, and can be, for example, 475 kg/m 3 or more and 1300 kg/m 3 or less.
粉体材料は、セメント及び骨材以外のその他の材料を含んでいてもよい。セメント以外のその他の材料としては、例えば、繊維材（ガラス繊維、鋼繊維、ビニロン繊維、アラミド繊維、ポリプロピレン繊維、炭素繊維等）、混和材（高炉スラグ、フライアッシュ、シリカフューム、膨張材等）、混和剤（減水剤、増粘剤、消泡剤等）等が挙げられる。 The powder material may contain materials other than cement and aggregate. Examples of materials other than cement include fiber materials (glass fiber, steel fiber, vinylon fiber, aramid fiber, polypropylene fiber, carbon fiber, etc.), admixtures (blast furnace slag, fly ash, silica fume, expanding agent, etc.), admixtures (water reducers, thickeners, defoamers, etc.), etc.
粉体材料の吹付け用ノズル内への供給量は、特に限定されるものではなく、例えば、２ｋｇ／ｍｉｎ以上５０ｋｇ／ｍｉｎ以下とすることができる。 The amount of powder material fed into the spray nozzle is not particularly limited, and can be, for example, 2 kg/min or more and 50 kg/min or less.
液体材料に含まれる水としては、特に限定されるものではなく、一般的な上水道水を用いることができる。また、液体材料は、水以外のその他の材料を含むものであってもよい。水以外のその他の材料としては、例えば、モルタルを混練する際に使用する減水剤等の混和剤、ポリマーディスパージョン液、収縮低減剤、凝結調整剤等が挙げられる。液体材料の配合量としては、特に限定されるものではなく、例えば、２００ｋｇ／ｍ３以上４００ｋｇ／ｍ３以下とすることができる。 The water contained in the liquid material is not particularly limited, and general tap water can be used. The liquid material may also contain other materials other than water. Examples of other materials other than water include admixtures such as water-reducing agents used when kneading mortar, polymer dispersion liquids, shrinkage reducing agents, setting regulators, and the like. The amount of the liquid material to be mixed is not particularly limited, and can be, for example, 200 kg/m 3 or more and 400 kg/m 3 or less.
液体材料の吹付け用ノズル内への供給量は、特に限定されるものではなく、例えば、０．２ｋｇ／ｍｉｎ以上１２．０ｋｇ／ｍｉｎ以下とすることができる。 The amount of liquid material supplied to the spray nozzle is not particularly limited, and can be, for example, 0.2 kg/min or more and 12.0 kg/min or less.
粉体材料と液体材料とを混練して得られた造形用モルタル組成物は、気体と共に支持体に吹付ける。吹付ける気体の圧力は、特に限定されるものではなく、例えば、５ｋＰａ以上６００ｋＰａ以下とすることができる。 The molding mortar composition obtained by kneading the powder material and the liquid material is sprayed onto the support together with the gas. The pressure of the gas to be sprayed is not particularly limited, and can be, for example, 5 kPa or more and 600 kPa or less.
粉体材料に対する液体材料の質量割合（液／粉体比）は、１０．０％以上２４．０％以下であることが好ましく、１２．０％以上１６．０％以下であることがより好ましい。 The mass ratio of the liquid material to the powder material (liquid/powder ratio) is preferably 10.0% or more and 24.0% or less, and more preferably 12.0% or more and 16.0% or less.
造形用モルタル組成物の単位体積質量は、１．７０ｔ／ｍ３以上２．４０ｔ／ｍ３以下であることが好ましく、１．７５ｔ／ｍ３以上２．２０ｔ／ｍ３以下であることがより好ましい。 The unit volume mass of the molding mortar composition is preferably 1.70 t/ m3 or more and 2.40 t/ m3 or less, and more preferably 1.75 t/ m3 or more and 2.20 t/ m3 or less.
本実施形態に係る造形物の製造方法は、乾式吹付け工法を用いて、造形用モルタル組成物を支持体に吹付けていて、さらに、粉体材料に含まれる骨材の吸水率が７．５％以下であることにより、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持することができる。また、前記造形物の製造方法は、乾式吹付け工法を用いているため、吹付け厚さを厚くすることができ、さらに、長距離圧送が可能であることに加えて、ホース内の洗浄も不要である。 The method for manufacturing a molded object according to this embodiment uses a dry spraying method to spray the mortar composition for molding onto a support, and furthermore, because the water absorption rate of the aggregate contained in the powder material is 7.5% or less, the time required to reach a hardness suitable for molding can be shortened and the hardness suitable for molding can be maintained for a long period of time. Furthermore, because the method for manufacturing a molded object uses a dry spraying method, the spray thickness can be made thick, and furthermore, pressure transport over long distances is possible, and cleaning of the inside of the hose is not required.
本実施形態に係る造形物の製造方法は、粉体材料に対する液体材料の質量割合（液／粉体比）が、１０．０％以上２４．０％以下であることにより、造形可能な硬さになるまでの時間をより短くすると共に、造形可能な硬さをより長時間維持することができる。 In the method for manufacturing a molded object according to this embodiment, the mass ratio of the liquid material to the powder material (liquid/powder ratio) is 10.0% or more and 24.0% or less, which shortens the time it takes to reach a hardness sufficient for molding and allows the hardness to be maintained for a longer period of time.
本実施形態に係る造形物の製造方法は、造形用モルタル組成物の単位体積質量が、１．７０ｔ／ｍ３以上２．４０ｔ／ｍ３以下であることにより、造形可能な硬さになるまでの時間をより短くすると共に、造形可能な硬さをより長時間維持することができる。 In the method for manufacturing a molded object according to this embodiment, the unit volume mass of the molding mortar composition is 1.70 t/ m3 or more and 2.40 t/ m3 or less, thereby shortening the time until the composition becomes hard enough to be molded and maintaining that hardness for molding for a longer period of time.
＜造形用モルタル組成物＞
本実施形態に係る造形用モルタル組成物は、本実施形態に係る造形物の製造方法に用いられる造形用モルタル組成物であって、セメント及び骨材を含む粉体材料と、水を含む液体材料と、を含み、骨材の吸水率が、７．５％以下である。すなわち、本実施形態に係る造形用モルタル組成物は、本実施形態に係る造形物の製造方法で記載する粉体材料及び液体材料を含む。
<Mortar composition for molding>
The mortar composition for modeling according to the present embodiment is a mortar composition for modeling used in the manufacturing method of a modeled object according to the present embodiment, and contains a powder material containing cement and aggregate, and a liquid material containing water, and the water absorption rate of the aggregate is 7.5% or less. That is, the mortar composition for modeling according to the present embodiment contains the powder material and liquid material described in the manufacturing method of a modeled object according to the present embodiment.
本実施形態に係る造形用モルタル組成物は、粉体材料に含まれる骨材の吸水率が７．５％以下であることにより、乾式吹付け工法を用いて造形物を造形する際に、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持することができる。 The mortar composition for molding according to this embodiment has an aggregate contained in the powder material with a water absorption rate of 7.5% or less, which shortens the time it takes for the composition to reach a hardness sufficient for molding when molding an object using the dry spraying method, and allows the composition to maintain a hardness sufficient for molding for a long period of time.
＜造形物＞
本実施形態に係る造形物は、本実施形態に係る造形用モルタル組成物を硬化させてなる。前記造形物は、単位体積質量が１．７０ｔ／ｍ３以上２．４０ｔ／ｍ３以下であることが好ましく、１．７５ｔ／ｍ３以上２．２０ｔ／ｍ３以下であることがより好ましい。
＜Sculpture＞
The shaped object according to the present embodiment is produced by hardening the shaping mortar composition according to the present embodiment. The shaped object preferably has a unit mass of 1.70 t/ m3 or more and 2.40 t/ m3 or less, and more preferably has a unit mass of 1.75 t/ m3 or more and 2.20 t/ m3 or less.
本実施形態に係る造形物は、本実施形態に係る造形用モルタル組成物を硬化させてなることにより、造形可能な硬さになるまでの時間を短くすると共に、造形可能な硬さを長時間維持して製造することができる。 The molded object according to this embodiment is produced by hardening the moldable mortar composition according to this embodiment, which shortens the time it takes for the composition to reach a hardness suitable for molding, and allows the composition to maintain a hardness suitable for molding for a long period of time.
本実施形態に係る造形物は、単位体積質量が１．７０ｔ／ｍ３以上２．４０ｔ／ｍ３以下であることにより、造形可能な硬さになるまでの時間をより短くすると共に、造形可能な硬さをより長時間維持して製造することができる。 The object according to this embodiment has a unit volume mass of 1.70 t/ m3 or more and 2.40 t/ m3 or less, which shortens the time it takes to reach a hardness sufficient for molding and allows the object to be manufactured while maintaining that hardness for a longer period of time.
以下、本発明の実施例について説明するが、本発明は、以下の実施例に限定されるものではない。 The following describes examples of the present invention, but the present invention is not limited to the following examples.
（造形用モルタル組成物）
まず、以下の骨材Ａ及びＢを表１に示す配合で混合し、骨材１～５を作製した。各骨材の吸水率を表１に示す。
骨材Ａ：高知県産石英砂、密度２．５１ｇ／ｃｍ３、吸水率０．２％
骨材Ｂ：メサライト（日本メサライト工業社製）、密度１．０８ｇ／ｃｍ３、吸水率１０．０％
(Mortar composition for molding)
First, aggregates A and B below were mixed in the proportions shown in Table 1 to prepare aggregates 1 to 5. The water absorption rate of each aggregate is shown in Table 1.
Aggregate A: Quartz sand from Kochi Prefecture, density 2.51 g/cm 3 , water absorption rate 0.2%
Aggregate B: Mesalite (manufactured by Nippon Mesalite Kogyo Co., Ltd.), density 1.08 g/cm 3 , water absorption rate 10.0%
次に、セメント（普通ポルトランドセメント、住友大阪セメント社製、密度３．１５ｇ／ｃｍ３）、及び、上述の骨材を混合して、各粉体材料を得た。また、液体材料としては、水（上水道水、密度１．００ｇ／ｃｍ３）を用いた。各成分の配合比、及び、液／粉体比を表２に示す。 Next, cement (ordinary Portland cement, manufactured by Sumitomo Osaka Cement Co., Ltd., density 3.15 g/ cm3 ) and the above aggregates were mixed to obtain each powder material. Water (tap water, density 1.00 g/ cm3 ) was used as the liquid material. The mixing ratio of each component and the liquid/powder ratio are shown in Table 2.
表２に示す施工方法に従って粉体材料と液体材料とを混練することにより、各実施例及び比較例のモルタル組成物を得た。モルタル組成物の単位体積質量を表２に示す。 The mortar compositions of each example and comparative example were obtained by kneading the powder material and liquid material according to the application method shown in Table 2. The unit volume mass of the mortar composition is shown in Table 2.
（造形可能時間の測定）
表２に示す施工方法にて、容器内に各モルタル組成物の吹付けを行った。そして、ＪＩＳ Ａ １１４７－２０１９ コンクリートの凝結時間試験方法に準拠して、貫入抵抗試験を行った。なお、容器は、内径が１５０ｍｍ、内高１５０ｍｍの金属製の円筒形のものを使用し、貫入針は１００ｍｍ２、５０ｍｍ２、２５ｍｍ２及び１２．５ｍｍ２の断面積のものを適宜使用した。造形可能な硬さのときの貫入抵抗値を２～８Ｎ／ｍｍ２として、造形の開始時間（２Ｎ／ｍｍ２となる時間）及び終了時間（８Ｎ／ｍｍ２となる時間）、並びに、これらの時間から算出される造形可能な総時間を表３に示す。造形の開始時間は、２時間未満を「○」、２時間以上を「×」と判定した。また、造形可能な総時間は、３時間以上を「○」、３時間未満を「×」と判定した。
(Measurement of buildable time)
Each mortar composition was sprayed into the container by the construction method shown in Table 2. Then, a penetration resistance test was performed in accordance with JIS A 1147-2019 Concrete Setting Time Test Method. The container used was a metal cylindrical container with an inner diameter of 150 mm and an inner height of 150 mm, and the penetration needles had cross-sectional areas of 100 mm 2 , 50 mm 2 , 25 mm 2 and 12.5 mm 2 as appropriate. The penetration resistance value at the time of hardness that can be molded is 2 to 8 N/mm 2 , and the start time of molding (the time at which it becomes 2 N/mm 2 ) and the end time (the time at which it becomes 8 N/mm 2 ), as well as the total time that can be molded calculated from these times, are shown in Table 3. The start time of molding was judged to be less than 2 hours as "○" and 2 hours or more as "×". In addition, the total time that can be molded was judged to be 3 hours or more as "○" and less than 3 hours as "×".
表３の結果から分かるように、本発明の構成要件をすべて満たす各実施例のモルタル組成物では、吹付け直後から造形可能な硬さであると共に、造形可能な硬さを３時間以上維持することができる。 As can be seen from the results in Table 3, the mortar compositions of the examples that meet all of the constituent requirements of the present invention are hard enough to be molded immediately after spraying, and can maintain this hardness for three hours or more.
一方、骨材の吸水率が７．５％を超える比較例１のモルタル組成物では、吹付け直後の貫入抵抗値が８Ｎ／ｍｍ２を超えていて、造形を行うことができなかった。 On the other hand, in the mortar composition of Comparative Example 1, in which the water absorption rate of the aggregate exceeded 7.5%, the penetration resistance value immediately after spraying exceeded 8 N/ mm2 , and molding could not be performed.
また、湿式吹付け工法を用いた比較例２及び３のモルタル組成物では、造形可能な硬さになるまで時間を要し、かつ、造形可能な硬さを長時間維持することができなかった。 In addition, the mortar compositions of Comparative Examples 2 and 3, which were produced using the wet spraying method, took a long time to harden to a level suitable for molding, and were unable to maintain this hardness for a long period of time.
Claims (5)
セメント及び骨材を含む粉体材料と、水を含む液体材料と、を吹付け用ノズル内で混練して造形用モルタル組成物を得た後、該造形用モルタル組成物を気体と共に支持体に吹付ける乾式吹付け工程を含み、
前記骨材の吸水率が、７．５％以下であり、
前記粉体材料に対する前記液体材料の質量割合（液／粉体比）が、１０．０％以上２４．０％以下である、造形物の製造方法。 A method for producing a shaped object by using a mortar composition for molding to form a desired shape, comprising the steps of:
The method includes a dry spraying step of kneading a powder material containing cement and aggregate and a liquid material containing water in a spray nozzle to obtain a mortar composition for molding, and then spraying the mortar composition for molding together with a gas onto a support,
The water absorption rate of the aggregate is 7.5% or less,
a mass ratio of the liquid material to the powder material (liquid/powder ratio) of 10.0% or more and 24.0% or less .
セメント及び骨材を含む粉体材料と、水を含む液体材料と、を含み、
前記骨材の吸水率が、７．５％以下である、造形用モルタル組成物。 A mortar composition for molding used in the method for producing a molded object according to claim 1 or 2 ,
A powder material including cement and aggregate, and a liquid material including water,
The mortar composition for molding, wherein the aggregate has a water absorption rate of 7.5% or less.
The shaped object according to claim 4 , having a unit volume mass of 1.70 t/m 3 or more and 2.40 t/m 3 or less.
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| JP2001097785A (en) | 1999-10-01 | 2001-04-10 | Tanseisha Co Ltd | Production of imitated formative body |
| JP2001261411A (en) | 2000-03-15 | 2001-09-26 | Taiheiyo Cement Corp | Method of spraying lightweight concrete |
| JP2019104643A (en) | 2017-12-12 | 2019-06-27 | 太平洋マテリアル株式会社 | Hydraulic composition for use in dry spray construction method |
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| JP2001097785A (en) | 1999-10-01 | 2001-04-10 | Tanseisha Co Ltd | Production of imitated formative body |
| JP2001261411A (en) | 2000-03-15 | 2001-09-26 | Taiheiyo Cement Corp | Method of spraying lightweight concrete |
| JP2019104643A (en) | 2017-12-12 | 2019-06-27 | 太平洋マテリアル株式会社 | Hydraulic composition for use in dry spray construction method |
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