JP2534174B2 - Bottom blowing material composition and method of forming outer wall on body surface - Google Patents

Bottom blowing material composition and method of forming outer wall on body surface

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Publication number
JP2534174B2
JP2534174B2 JP3358288A JP35828891A JP2534174B2 JP 2534174 B2 JP2534174 B2 JP 2534174B2 JP 3358288 A JP3358288 A JP 3358288A JP 35828891 A JP35828891 A JP 35828891A JP 2534174 B2 JP2534174 B2 JP 2534174B2
Authority
JP
Japan
Prior art keywords
blowing material
material composition
mortar
fibers
strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP3358288A
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Japanese (ja)
Other versions
JPH05178649A (en
Inventor
原田  進
隆 常山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikawa Kenzai Kogyo Ltd
Original Assignee
Fujikawa Kenzai Kogyo Ltd
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Application filed by Fujikawa Kenzai Kogyo Ltd filed Critical Fujikawa Kenzai Kogyo Ltd
Priority to JP3358288A priority Critical patent/JP2534174B2/en
Publication of JPH05178649A publication Critical patent/JPH05178649A/en
Application granted granted Critical
Publication of JP2534174B2 publication Critical patent/JP2534174B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は躯体表面に付着する強度
が高く、且つ収縮が小さい下吹材層を形成することがで
き、しかもその表面に塗着する上吹材の食いつきが良好
であるような下吹材組成物、及びこれを利用したもので
あるところの躯体表面に外壁を形成する工法に関するも
のである。
INDUSTRIAL APPLICABILITY The present invention is capable of forming a lower blowing material layer having a high strength of adhering to the surface of a skeleton and a small shrinkage, and moreover, the biting of the upper blowing material applied to the surface is good. The present invention relates to such a lower blowing material composition, and a method of forming an outer wall on the surface of a skeleton using the same.

【0002】[0002]

【従来の技術】近年、外壁の剥離落下事故が多発し、早
急な対策が希求されている。従来より、モルタル塗りで
外壁を構築する場合、躯体表面に水湿しをした後、下塗
りを行って2週間程度の養生期間をとり、中塗りを行っ
て十分な養生期間をとり、さらに上塗りして所定の厚さ
の外壁を得ている。しかし、上記した方法では下地或い
は作業者によるバラツキが生じ、その結果付着強度もバ
ラツキを生ずる傾向があった。一方、躯体表面にセメン
トペースト塗布した後に直ちにモルタルを塗り付ける工
法も採られてきたが、工程管理が難しく、敬遠されがち
であった。或いは付着強度のバラツキを少なくする目的
で、セメント混和用ポリマーディスパージョンを塗布し
た後、モルタルを塗る工法も採られてきたが、ポリマー
ディスパージョンの耐久性に問題があるとの見解が一般
的である。したがって、このような方法で作製される外
壁の付着強度は、 躯体と無機質硬化物(=モルタル組成物が硬化したも
の)との接着強度、 無機質硬化物自体が有する強度、 先に塗り付けて得られた無機質硬化物とその表面に塗
り付けて得られる無機質硬化物との層間強度、 にかかわっている。そして、現在までに発生した外壁の
剥離・浮きは、躯体表面とモルタルの界面で発生してい
るケースが非常に多い。
2. Description of the Related Art In recent years, peeling and falling accidents on outer walls have frequently occurred, and immediate countermeasures have been demanded. Conventionally, when building an outer wall with mortar coating, after moistening the surface of the skeleton with water, undercoating is applied for a curing period of about 2 weeks, middle coating is performed for a sufficient curing period, and then top coating is applied. To obtain an outer wall with a predetermined thickness. However, in the above-mentioned method, variations occur depending on the substrate or the operator, and as a result, the adhesion strength also tends to vary. On the other hand, a method of applying mortar immediately after applying the cement paste on the surface of the skeleton has been adopted, but it is difficult to manage the process and tends to be shunned. Alternatively, in order to reduce the variation in adhesive strength, a method of applying mortar after applying a polymer dispersion for cement admixture has also been adopted, but the general view is that there is a problem with the durability of the polymer dispersion. is there. Therefore, the adhesive strength of the outer wall produced by such a method is as follows: The adhesive strength between the body and the inorganic cured product (= cured mortar composition), the strength of the inorganic cured product itself, It is concerned with the interlaminar strength between the obtained inorganic cured product and the inorganic cured product obtained by applying on the surface thereof. In most cases, the peeling / floating of the outer wall that has occurred so far occurs at the interface between the skeleton surface and the mortar.

【0003】[0003]

【発明が解決しようとする課題】前記したような外壁の
剥離落下事故を防止するには、上記した〜の強度を
向上するような対策と、冷熱繰り返し、乾湿繰り返しに
よるムーブメントを緩衝するような対策とが必要とされ
る。そして、の強度は、例えば躯体に対してセメント
混和用ポリマーディスパージョン等を多量に混入したモ
ルタル組成物或いはエポキシ樹脂と骨材とを主原料とし
た樹脂モルタル等を使用することにより向上する。しか
し、このようなモルタル組成物を塗工するには作業性が
悪く、しかも原材料費が高価であるという問題を有す
る。また、の強度は、アラミド繊維、カーボン繊維な
どの高強度の繊維材料を混合したモルタル組成物を使用
することにより向上する。しかし、このようなモルタル
組成物は、やはり原材料費が高価となる。さらに、の
強度は、例えば接合面を物理的に凹凸にすると向上す
る。しかし、そのような作業は面倒であり、しかも充分
な接合強度を得られない。即ち、最近では型枠に工夫を
して躯体表面に凹凸を付ける工法、或いはセメント混和
用ポリマーディスパージョンを混入したセメントペース
トにより躯体表面にネットを固定化する工法等種々の工
法が検討されている。しかし、いずれの工法も作業は極
めて面倒である。また、従来の塗り付け工法では、熟練
した技能者(左官職人)に負うところが大きいため、作
業の迅速化や能率化が進められないという問題もある。
そして、特に近年における人手不足ではこのような問題
が、より深刻化している。加えて、人手による作業で
は、形成される外壁の性状を均一化することは極めて困
難である。他方、軽量化されたモルタルの使用は、全体
に掛かる重力負荷を軽減するので有効な方法であるが、
上記した〜の強度を向上するものではなく、また、
吸水量及び透水量が多くなり、下地として的確でない。
したがって、機械化することができて安定な作業を行う
ことができるような工法で、しかもその工法により得ら
れる外壁は前記した〜の強度が高く、塗工したモル
タル硬化物の品質が均一化し、長期間の経時においても
剥離等の事故を生ずることがないような工法が嘱望され
ていた。
In order to prevent the above-mentioned accidental peeling and falling of the outer wall, the above-mentioned measures for improving the strengths of ~ and measures for buffering the movement caused by repeated cold heat and dry humidity. And are needed. Then, the strength of is improved by using, for example, a mortar composition in which a large amount of a polymer mixture for cement admixture or the like is mixed in the skeleton, or a resin mortar containing an epoxy resin and an aggregate as main raw materials. However, there is a problem in that workability is poor in applying such a mortar composition, and raw material costs are high. Further, the strength is improved by using a mortar composition in which a high-strength fiber material such as aramid fiber or carbon fiber is mixed. However, such a mortar composition also has a high raw material cost. Further, the strength of is improved by, for example, physically making the joint surface uneven. However, such work is troublesome, and sufficient bonding strength cannot be obtained. That is, recently, various construction methods have been studied, such as a construction method in which a mold frame is devised to make unevenness on the surface of the skeleton, or a method of fixing a net to the skeleton surface by cement paste mixed with a cement mixing polymer dispersion. . However, the work is extremely troublesome in any of the construction methods. Further, in the conventional painting method, there is a problem that a skilled technician (plasterer) is liable to do so that work cannot be speeded up or streamlined.
And, in particular, due to the shortage of manpower in recent years, such a problem has become more serious. In addition, it is extremely difficult to uniformize the properties of the outer wall formed by manual work. On the other hand, the use of lightweight mortar is an effective method because it reduces the gravitational load on the whole,
It does not improve the strengths of above,
The amount of water absorbed and the amount of water permeated are large, making it unsuitable as a base.
Therefore, the outer wall obtained by such a construction method that can be mechanized and can perform stable work has a high strength of the above-mentioned, the quality of the coated mortar cured product is uniform, and There was a strong demand for a construction method that would not cause an accident such as peeling even after the period.

【0004】[0004]

【課題を解決するための手段】本発明は上記に鑑み提案
されたもので、太さ100〜2000デニール,長さ3
〜30mmの針状繊維0.1〜2wt%と、ポルトラン
ドセメント20〜40wt%と、珪砂40〜60wt%
とを含有してなることを特徴とする下吹材組成物に関す
るものである。また、本発明は、上記した下吹材組成物
を利用した工法をも提案するものであり、躯体表面に、
太さ100〜2000デニール,長さ3〜30mmの針
状繊維0.1〜2wt%と、ポルトランドセメント20
〜40wt%と、珪砂40〜60wt%とを含有してな
る下吹材組成物を吹付塗工してその塗面に針状繊維の一
部を突出させた後、ポルトランドセメント40〜60w
t%と、エチレン酢酸ビニル重合体と炭酸カルシウムと
の組成物を発泡させた粒子物(以下、エチレン酢酸ビニ
ル−炭酸カルシウム発泡粒子物という)3〜20wt%
とを含有してなる上吹材組成物を吹付塗工することを特
徴とする躯体表面に外壁を形成する工法に関するもので
ある。
The present invention has been proposed in view of the above, and has a thickness of 100 to 2000 denier and a length of 3.
〜30mm needle-like fibers 0.1-2wt%, Portland cement 20-40wt%, silica sand 40-60wt%
The present invention relates to a lower blowing material composition containing: Further, the present invention also proposes a construction method using the above-mentioned lower blowing material composition, on the body surface,
0.1 to 2 wt% acicular fibers having a thickness of 100 to 2000 denier and a length of 3 to 30 mm, and Portland cement 20
-40% by weight and 40-60% by weight of silica sand are spray-coated to make a part of the acicular fibers project on the coated surface, and then Portland cement 40-60w
t%, 3 to 20 wt% of particles obtained by expanding a composition of ethylene vinyl acetate polymer and calcium carbonate (hereinafter referred to as ethylene vinyl acetate-calcium carbonate expanded particles)
The present invention relates to a method for forming an outer wall on the surface of a skeleton, which comprises spray-coating a top blowing material composition containing

【0005】上記した本発明における針状繊維は、太さ
100〜2000デニール,長さ3〜30mmのビニロ
ン、ポリエステル、アクリル、ポリプロピレン、カーボ
ン、ポリアミド、耐アルカリガラス繊維或いはスチール
ファイバー等を使用することができ、ポルトランドセメ
ント及び珪砂等との混合或いは吹付け作業時の圧送を考
慮し、太さ200〜1800デニール,長さ5〜15m
mのものを使用することが好ましい。上吹材組成物の剥
落を防止するためには、高強度、高ヤング係数の繊維が
好ましい。上吹材の食いつきが良いだけでなく、下吹材
のクラック防止も充分に考慮し、太さを選定する必要が
ある。太さ100デニール以下になると下吹材組成物の
粉体との分散混合が悪く、塊状になり易く、水を加えて
混練り分散させた場合でも塊状のまま残り、ポンプ圧送
時に詰ったり、仮に巧く分散できたとしても、混練り分
散させたペーストと馴染み易く、吹付塗工時の繊維の立
ちが少ない。しかも繊維が細いため剥落防止のための強
度が充分でない。太さ2000デニール以上になると粉
体への分散混合は容易になり、吹付塗工時の繊維の立ち
は多くなり、上吹材との食いつきは良くなり、剥落防止
のための強度も強くなる。また、上記した針状繊維の使
用量は、0.1〜2wt%の範囲内で針状繊維の太さ及
び長さを考慮して使用量を決めれば良いが、粉体中での
混合分散或いは吹付け作業時のつまり具合を考慮する
と、0.1〜1wt%の範囲内で使用することが好まし
い。上記した針状繊維の使用量が0.1wt%以下で
は、クラック防止効果が充分でなく、また、表面に露出
する量が少ないので上吹材組成物の食いつきも充分でな
く、下吹材組成物と上吹材組成物との界面の接着強度が
低いものとなる。一方、使用量が2wt%以上になる
と、粉体中での分散が困難になって繊維の塊が発生する
ためポンプ圧送時の作業性が低下し、詰り等が生じ易く
なるので好ましくない。
As the needle-shaped fibers in the present invention described above, use is made of vinylon, polyester, acrylic, polypropylene, carbon, polyamide, alkali-resistant glass fiber or steel fiber having a thickness of 100 to 2000 denier and a length of 3 to 30 mm. Considering the mixing with Portland cement and silica sand, or pressure feeding during spraying work, thickness 200-1800 denier, length 5-15m
It is preferable to use m. In order to prevent the upper blowing material composition from peeling off, fibers having high strength and high Young's modulus are preferable. It is necessary to select the thickness in consideration of not only the biting of the upper blowing material is good, but also the prevention of cracks in the lower blowing material. When the thickness is 100 denier or less, the dispersion and mixing with the powder of the lower blowing material composition is poor and tends to form a lump, and even when water is added and kneaded and dispersed, the lump remains as a lump and may be clogged during pumping. Even if it is successfully dispersed, it is easily compatible with the paste that has been kneaded and dispersed, and there is little standing of fibers during spray coating. Moreover, since the fibers are thin, the strength for preventing peeling is not sufficient. When the thickness is 2000 denier or more, the dispersion and mixing into the powder becomes easy, the fibers stand up more during spray coating, the biting with the upper spray material becomes better, and the strength for preventing flaking becomes stronger. The above-mentioned amount of needle-like fibers used may be determined within the range of 0.1 to 2 wt% in consideration of the thickness and length of the needle-like fibers. Alternatively, considering the degree of clogging at the time of spraying work, it is preferable to use within the range of 0.1 to 1 wt%. When the amount of the above-mentioned needle-like fibers used is 0.1 wt% or less, the crack preventing effect is insufficient, and since the amount exposed on the surface is small, the biting of the upper blowing material composition is also insufficient, and the lower blowing material composition The adhesive strength at the interface between the product and the upper blowing material composition is low. On the other hand, if the amount used is 2 wt% or more, it becomes difficult to disperse the powder in the powder and lumps of fibers are generated, so that the workability at the time of pumping is deteriorated and clogging easily occurs, which is not preferable.

【0006】上記した針状繊維を含有する下吹材組成物
は、ポルトランドセメント20〜40wt%と、珪砂4
0〜60wt%とを含有するが、ポルトランドセメント
の配合量が20wt%より少ないと強度の低下が著し
い。一方、40wt%を越えると、収縮量が大きくなる
ため、クラックが発生し易い。また、珪砂の配合量が4
0wt%より少ないと強度は増大するが、収縮量が大き
くなる。一方、60wt%を越えるとこの逆となる。
尚、下吹材組成物は通常3〜10mm程度の厚さに塗工
されるため、珪砂の大きさは1.5mm以下程度を使用
した方が好ましい。
The bottom blowing material composition containing the above-mentioned needle-shaped fibers is composed of 20 to 40 wt% of Portland cement and 4 parts of silica sand.
Although the content of Portland cement is less than 20% by weight, the strength is significantly reduced. On the other hand, if it exceeds 40 wt%, the amount of shrinkage becomes large and cracks are likely to occur. Also, the silica sand content is 4
If it is less than 0 wt%, the strength increases, but the amount of shrinkage increases. On the other hand, when it exceeds 60 wt%, the opposite is true.
Since the lower blowing material composition is usually applied to a thickness of about 3 to 10 mm, it is preferable to use silica sand having a size of about 1.5 mm or less.

【0007】本発明における下吹材組成物は、上記した
ような針状繊維及びポルトランドセメント、珪砂を含有
する構成であるが、躯体への付着強度を安定させるた
め、アクリル系樹脂エマルジョン、エチレン酢酸ビニル
共重合系エマルジョン、SBRラテックス等のセメント
混和用ポリマーディスパージョンをモルタルに混和して
使用しても良い。また、吹付け特性を向上させる目的や
その他の付加目的のために各種の添加材を混合すること
ができる。
The lower blowing material composition in the present invention has a composition containing needle fibers, Portland cement and silica sand as described above, but in order to stabilize the adhesion strength to the skeleton, an acrylic resin emulsion, ethylene acetic acid is used. A polymer dispersion for cement mixing such as vinyl copolymer emulsion and SBR latex may be mixed with mortar and used. Further, various additives can be mixed for the purpose of improving spraying characteristics and other additional purposes.

【0008】次に、本発明における上吹材組成物は、ポ
ルトランドセメント40〜60wt%と、エチレン酢酸
ビニル−炭酸カルシウム発泡粒子物3〜20wt%とを
含有するが、エチレン酢酸ビニル−炭酸カルシウム発泡
粒子物の使用量が3wt%以下ではつなぎ材としての効
果が少なく、クラック防止効果が充分でない。また、冷
熱繰り返し、乾湿繰り返しによるムーブメントを充分に
緩衝することができない。一方、使用量が20wt%以
上では、圧送作業が困難になり、また、上吹材組成物自
体の強度やその表面に埋設させるタイル等を保持する強
度も低下する。このエチレン酢酸ビニル−炭酸カルシウ
ム発泡粒子物は、上記したような効果を奏する弾性骨材
である一方、軽量骨材であるため、通常の砂や珪砂を使
用したモルタルの単位容積質量が2.1kg/lである
のに対し、上吹材組成物は1.6kg/l程度となり、
吹付け作業においても自重で流下(タレ落ち)すること
がない。尚、上記した上吹材組成物にも、前記した下吹
材組成物と同様に各種の添加材を混合することができ
る。
Next, the top blowing material composition of the present invention contains 40 to 60 wt% of Portland cement and 3 to 20 wt% of ethylene vinyl acetate-calcium carbonate expanded particles, and ethylene vinyl acetate-calcium carbonate foam. When the amount of the particulate matter used is 3 wt% or less, the effect as a binder is small and the crack preventing effect is insufficient. Further, it is impossible to sufficiently buffer the movement due to repeated cold heat and dry humidity. On the other hand, if the amount used is 20 wt% or more, the pressure-feeding work becomes difficult, and the strength of the upper blowing material composition itself and the strength of holding the tiles and the like to be embedded in the surface thereof also decrease. This ethylene vinyl acetate-calcium carbonate expanded particle product is an elastic aggregate that exhibits the above-mentioned effects, while it is a lightweight aggregate, so the unit volume mass of mortar using ordinary sand or silica sand is 2.1 kg. / L, whereas the top blowing material composition is about 1.6 kg / l,
Even during spraying work, it will not flow down (fall down) under its own weight. It should be noted that various additive materials can be mixed in the above-mentioned upper blowing material composition as in the above-mentioned lower blowing material composition.

【0009】本発明の工法は、前記したように構成され
る下吹材組成物を躯体表面に吹付け塗工する第一工程の
後、前記したように構成される上吹材組成物を下吹材層
の表面に吹付け塗工する第二工程を行うものである。上
記した第一工程では、収縮が小さく、付着強度が高い下
吹材層が形成される。この場合、鏝塗りでは作業者やそ
の他の因子等により鏝圧のバラツキが生じ、物性・性状
が不均一になり易いが、吹付け塗工では、一定圧力で躯
体表面に付着するので、均一な物性・性状を有する下吹
材層が形成される。また、吹付け塗工により、下吹材層
の表面は凹凸になり、しかも針状繊維が表面に立ち上が
るので、上吹材組成物の食いつきが向上して剥落を防止
することができる。また、第二工程では、収縮が小さ
く、軽量な上吹材層が形成されるが、この表面にはタイ
ル等を埋設することができる。このタイル等は気温や湿
度の変化によるムーブメントを起こすが、弾性骨材(エ
チレン酢酸ビニル−炭酸カルシウム発泡粒子物)のため
にこのムーブメントを緩衝するので、タイル等の剥落を
生ずることがない。
According to the method of the present invention, after the first step of spray-coating the lower blowing material composition having the above-described structure on the surface of the skeleton, the upper blowing material composition having the above-described structure is applied. The second step of spray coating on the surface of the spray material layer is performed. In the above-mentioned first step, the lower blowing material layer having a small shrinkage and a high adhesive strength is formed. In this case, the trowel coating causes variations in the trowel pressure due to the operator or other factors, and the physical properties and properties are likely to be non-uniform. A lower blowing material layer having physical properties is formed. Further, the spray coating makes the surface of the lower blowing material layer uneven, and since the needle-shaped fibers rise up on the surface, the biting of the upper blowing material composition is improved and peeling can be prevented. Further, in the second step, a lightweight top blowing material layer having a small shrinkage is formed, and a tile or the like can be embedded on this surface. This tile or the like causes a movement due to changes in temperature and humidity, but since the movement is buffered by the elastic aggregate (ethylene vinyl acetate-calcium carbonate expanded particles), the tile or the like does not come off.

【0010】[0010]

【実施例】以下に、本発明の実施例を示す。EXAMPLES Examples of the present invention will be shown below.

【0011】下吹材配合例1〜22 表1〜3に示す配合の組成物100部に、合成樹脂エマ
ルジョン(シーレックス,富士川建材工業株式会社製)
を水で5倍に希釈したものを20部加え、モルタルミキ
サーで混練りした後、吹付機械(新明和製DM−15
型)により吹付け塗工した。
Bottom Blowing Material Formulation Examples 1-22 100 parts of the compositions shown in Tables 1 to 3 were mixed with a synthetic resin emulsion (Cyrex, manufactured by Fujikawa Kenzai Kogyo Co., Ltd.).
20 parts of 5 times diluted with water were added, and after kneading with a mortar mixer, a spraying machine (DM-15 manufactured by Shin Meiwa)
Spray coating.

【0012】 (下吹材組成物の吹付け塗工試験1) 吹付作業性を 材料の送り・吹付作業共スムーズにできるものを ◎ 材料の送り・吹付作業共おそいものを ○ 材料が詰まって送りができず、吹付作業不可のものを × と判定し、表1〜3に示した。(Blowing coating test 1 of the lower blowing material composition) A material that allows smooth spraying work for both material feeding and spraying work ◎ Both material feeding and spraying work slow When the spraying work was not possible and the spraying work was not possible, it was judged as x and shown in Tables 1 to 3.

【0013】 (下吹材組成物の吹付け塗工試験2) 繊維の立ち具合を 下吹材に繊維がささった状態が数多く見られるものを ◎ 下吹材に繊維がささった状態が少ないものを ○ 下吹材に繊維がささった状態がほとんどないものを × と判定し、表1〜3に示した。尚、下吹材配合例1〜8
(表1)で針状繊維の長さによる比較を行い、下吹材配
合例9〜18(表2)で針状繊維の太さによる比較を行
い、下吹材配合例19〜22(表3)で針状繊維の混入
量による比較を行った。
(Blowing Coating Test 2 of Bottom Blowing Material Composition) As for the state of standing of the fibers, it can be seen that a lot of the fibers are stuck in the bottom blowing material. ○ When the bottom blowing material had almost no fibers stuck in it, it was judged as × and shown in Tables 1 to 3. In addition, lower blowing material compounding examples 1-8
In Table 1, a comparison is made according to the length of the needle-shaped fibers, and in Examples 9 to 18 of the lower blowing materials (Table 2), a comparison is made according to the thickness of the needle-shaped fibers, and in the Examples 19 to 22 of the lower blowing materials (Table In 3), comparison was made according to the amount of needle fibers mixed.

【0014】[0014]

【表1】 [Table 1]

【0015】[0015]

【表2】 [Table 2]

【0016】[0016]

【表3】 [Table 3]

【0017】(下吹材層の曲げ強度試験)前記した吹付
け塗工試験において下吹材配合例11,14,17の組
成物を使用して得られた下吹材層の曲げ強度試験を行っ
た。測定された曲げ強度と、試験時の試験体の状態を表
4に示した。尚、比較例Aとして 普通モルタル 繊維
なし(1:2モルタル)を添加していないを試験した結
果も併せて表4に示した。
(Bending Strength Test of Bottom Blowing Material Layer) The bending strength test of the bottom blowing material layer obtained by using the compositions of the bottom blowing material formulation examples 11, 14, and 17 in the above-mentioned spray coating test was carried out. went. Table 4 shows the measured bending strength and the state of the test piece at the time of the test. In addition, Table 4 also shows the results of a test in which, as Comparative Example A, normal mortar without fiber (1: 2 mortar) was tested.

【0018】[0018]

【表4】 [Table 4]

【0019】上吹材配合例1〜7 表5に示す配合の組成物100部に、合成樹脂エマルジ
ョン(シーレックス,前述)を水で5倍に希釈したもの
を35部加え、モルタルミキサーで混練りした後、吹付
機械(新明和製DM−15型)により吹付け塗工した。
Top Blowing Material Mixing Examples 1-7 To 100 parts of the composition shown in Table 5, 35 parts of a synthetic resin emulsion (Cyrex, mentioned above) diluted 5 times with water was added and kneaded with a mortar mixer. After that, spray coating was carried out by a spraying machine (DM-15 type manufactured by Shinmeiwa).

【0020】(上吹材組成物の吹付け塗工試験)評価方
法は、前記した下吹材組成物の吹付け塗工試験1,2に
準じる。その結果は、表5に示した。尚、比較例Bとし
て 普通モルタル(1:3モルタル)を試験した結果も
併せて表5に示した。
(Spray coating test of upper spray material composition) The evaluation method is in accordance with the spray coating tests 1 and 2 of the lower spray material composition described above. The results are shown in Table 5. Table 5 also shows the results of testing ordinary mortar (1: 3 mortar) as Comparative Example B.

【0021】[0021]

【表5】 [Table 5]

【0022】(上吹材層の曲げ強度試験)上記した上吹
材組成物の吹付け塗工試験において、上吹材配合例2,
3,5,6の組成物を使用して得られた上吹材層、比較
例Bの曲げ強度試験を行った。測定された曲げ強度と、
試験時の試験体の状態を表6に示した。
(Bending Strength Test of Top Blowing Material Layer) In the spray coating test of the above-mentioned top blowing material composition, Top Blowing Material Mixing Example 2,
The bending strength test of the upper blowing material layer, Comparative Example B, obtained using the compositions 3, 5, and 6 was performed. The measured bending strength,
Table 6 shows the state of the test body at the time of the test.

【0023】[0023]

【表6】 [Table 6]

【0024】(現場試験)前記した下吹材配合例11及
び上吹材配合例2をもとに現場試験施行を行った。 [下吹材組成] ポルトランドセメント 36.0 部 ケイ砂 58.0 部 ビニロン繊維(350デニール,10mm) 0.4 部 増粘剤 0.06部 添加剤 5.54部 [上吹材組成] ポルトランドセメント 53.0 部 エチレン酢酸ビニル−炭酸カルシウム発泡粒 4.8 部 ケイ砂 35.0 部 増粘剤 0.04部 添加剤 7.16部 上記した組成の下吹材及び上吹材により、7階建のオフ
ィスビルで施工面積700m2 の現場試験を実施した。 [施工方法] 1.吹付機器 モルタルポンプ…新明和製 ガン機 …富士川建材工業株式会社特製 コンプレッサー…2馬力 2.調合 2−1)エマルジョン(シーレックス)の希釈 シーレックス1缶18kgに対し、シーレックスの空缶
に4杯分の水を混合し、よく撹拌して5倍液として使用
した。 2−2)モルタルの調合 下吹き 下吹材 25kg シーレックス5倍液 5kg 中吹き・上吹き 上吹材 25kg シーレックス5倍液 5kg 上記したモルタルをモルタルミキサーでダマがなくなる
まで十分混練りした。 3.吹き付け 3−1)下吹き塗工 口径6mmを使用し、コンクリート躯体に厚さ5mm程
度吹付けた。 3−2)中吹き塗工 下吹きした翌日、口径8mmで厚さ7〜10mm程度中
吹きを行った。但し、吹き厚20mm以下の箇所は中吹
きを省略し、上吹きを行った。 3−3)上吹き塗工 中吹きした翌日、口径8mmで厚さ7〜10mm程度吹
付けた。 4.定規ずり 上吹き施工後、モルタル水引きをみて定規ずりを行い、
コテにて表面を平らに仕上げた。 5.養生 上吹き後、14日以上養生し、タイル貼りを行った。
尚、モルタルの乾燥・養生中は、直射日光・直接の風当
たりのないようにシート等で養生した。
(Field Test) A field test was carried out based on the above-mentioned lower blowing material compounding example 11 and upper blowing material compounding example 2. [Bottom blowing material composition] Portland cement 36.0 parts Silica sand 58.0 parts Vinylon fiber (350 denier, 10 mm) 0.4 parts Thickener 0.06 parts Additive 5.54 parts [Top blowing material composition] Portland semé 53.0 parts Ethylene vinyl acetate-calcium carbonate foam granules 4.8 parts Silica sand 35.0 parts Thickener 0.04 parts Additives 7.16 parts By the lower and upper blowing materials of the above composition, 7 A site test was conducted in a one-story office building with a construction area of 700 m 2 . [Construction method] 1. Spraying equipment Mortar pump… Shin Meiwa gun machine… Fujikawa Kenzai Co., Ltd. special compressor… 2 horsepower 2. Formulation 2-1) Dilution of Emulsion (Cyrex) For 18 kg of Cyrex, 4 cans of water were mixed in an empty can of Cyrex, stirred well and used as a 5 times liquid. 2-2) Preparation of mortar Bottom blowing Bottom blowing material 25 kg Seelex 5 times liquid 5 kg Medium blowing / top blowing Top blowing material 25 kg Seelex 5 times liquid 5 kg The above mortar was sufficiently kneaded with a mortar mixer until lumps disappeared. 3. Spraying 3-1) Bottom spray coating Using a diameter of 6 mm, the concrete structure was sprayed with a thickness of about 5 mm. 3-2) Medium-blow coating The day after the lower-blow coating, medium-blow was performed with a diameter of 8 mm and a thickness of 7 to 10 mm. However, the middle blow was omitted and the upper blow was performed at a portion having a blow thickness of 20 mm or less. 3-3) Top spray coating The next day after spraying, spraying was performed with a diameter of 8 mm and a thickness of about 7 to 10 mm. 4. Ruler slide After top blowing construction, perform ruler slide by observing mortar drainage,
The surface was finished flat with a trowel. 5. Curing After top blowing, curing was performed for 14 days or more and tiled.
During drying and curing of the mortar, it was cured with a sheet so that it was not exposed to direct sunlight or direct wind.

【0025】[接着力試験]モルタル吹付け作業が終了
した後、材令1週、2週、4週経過した部分について接
着力試験を行った。カッターにて4×4cmに躯体に達
する切込みを入れる。表面及びカット面の粉塵を取り除
いた後、エポキシ樹脂接着剤にて接着試験用鋼製アタッ
チメントを貼り付けガムテープ等で固定する。接着試験
には小型接着力試験機(佐久間工機製)を使用して、モ
ルタル面に対して直角に引張り、破断時の荷重を油圧メ
ーターより読み取る。尚、試験体数は1ヶ所5個(N=
5)とし、各々の数値を断面積(4×4=16cm2
で除して単位面積当りの接着力で示した。結果は表7〜
9に示した。
[Adhesive Strength Test] After the mortar spraying work was completed, the adhesive strength test was conducted on the parts which were 1 week, 2 weeks and 4 weeks old. Make a 4x4 cm cut with a cutter to reach the body. After removing the dust on the surface and the cut surface, attach a steel attachment for adhesion test with epoxy resin adhesive and fix it with gum tape or the like. For the adhesion test, use a small adhesive strength tester (made by Sakuma Koki), pull at a right angle to the mortar surface, and read the load at break from the hydraulic meter. The number of test specimens is 5 at 1 place (N =
5), and each value is the cross-sectional area (4 × 4 = 16 cm 2 ).
It is shown by the adhesive force per unit area by dividing by. The results are shown in Table 7-
9 shows.

【0026】[0026]

【表7】 [Table 7]

【0027】[0027]

【表8】 [Table 8]

【0028】[0028]

【表9】 [Table 9]

【0029】施工時現場より試料を採取し、スランプの
測定、曲げ強度の測定、圧縮強度の測定、吸水量の測
定、長さ変化の測定を行った。 [スランプの測定]JIS A 1101(コンクリー
トのスランプ試験方法)に準じた。結果は表10に示し
た。
At the time of construction, a sample was taken from the site, and slump measurement, bending strength measurement, compression strength measurement, water absorption amount measurement, and length change measurement were performed. [Measurement of slump] In accordance with JIS A 1101 (concrete slump test method). The results are shown in Table 10.

【0030】[0030]

【表10】 [Table 10]

【0031】[曲げ強度の測定]JIS R 5201
(セメントの物理試験方法)に準じた。結果は表11に
示した。
[Measurement of Bending Strength] JIS R 5201
(Physical test method for cement) The results are shown in Table 11.

【0032】[0032]

【表11】 [Table 11]

【0033】[圧縮強度の測定]JIS R 5201
(セメントの物理試験方法)に準じた。結果は表12に
示した。
[Measurement of compressive strength] JIS R 5201
(Physical test method for cement) The results are shown in Table 12.

【0034】[0034]

【表12】 [Table 12]

【0035】[吸水量の測定]JASS 15M102
(既調合セメントモルタルの品質基準)に準じた。結果
は表13に示した。
[Measurement of Water Absorption] JASS 15M102
(Quality standard of already prepared cement mortar) was followed. The results are shown in Table 13.

【0036】[0036]

【表13】 [Table 13]

【0037】[長さ変化の測定]JASS 15M10
2(既調合セメントモルタルの品質基準)に準じた。結
果は表14に示した。
[Measurement of change in length] JASS 15M10
2 (Quality standard of already prepared cement mortar) was followed. The results are shown in Table 14.

【0038】[0038]

【表14】 [Table 14]

【0039】 以上、現場試験において吹付作業がスムーズで、モルタ
ルの浮き・ヒビ割れ等の発生がなく、作業効率も鏝塗り
より良い結果が得られた。
[0039] As described above, in the field test, the spraying work was smooth, the mortar did not float and cracked, and the work efficiency was better than that of the trowel coating.

【0040】[0040]

【発明の効果】以上説明したように、本発明の下吹材組
成物は吹付け作業性が優れ、躯体表面に付着する強度が
高く、且つ収縮が小さい下吹材層を形成することができ
る。また、下吹材層は、その表面からは針状繊維の一部
が露出するので、塗着する上吹材の食いつきが良好とな
る。さらに、下吹材層は、針状繊維が均一に含有されて
いるためにその圧縮強度及び曲げ強度が極めて高く、し
かも変形率は極めて低い。
As described above, the lower blowing material composition of the present invention is excellent in spraying workability, has a high strength of adhering to the body surface, and can form a lower blowing material layer with a small shrinkage. . Further, in the lower blowing material layer, part of the needle-like fibers are exposed from the surface of the lower blowing material layer, so that the biting of the applied upper blowing material becomes good. Further, the lower blowing material layer has extremely high compressive strength and bending strength because the needle-like fibers are uniformly contained, and the deformation rate is extremely low.

【0041】また、本発明の躯体表面に外壁を形成する
工法は、上記した下吹材組成物と上吹材組成物とをそれ
ぞれ吹付け塗工するだけの簡単な操作により実施される
ものであり、極めて作業性が簡便である。したがって、
従来のように熟練作業者に依存することもなく、極めて
迅速に能率的に行うことができ、作業の機械化も可能と
なる。
Further, the method of forming the outer wall on the surface of the body of the present invention is carried out by a simple operation of spray coating each of the above lower blowing material composition and upper blowing material composition. Yes, the workability is extremely simple. Therefore,
It does not depend on a skilled worker as in the past, can be performed extremely quickly and efficiently, and mechanization of work is also possible.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 E04F 13/02 8913−2E E04F 13/02 A 8913−2E C ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location E04F 13/02 8913-2E E04F 13/02 A 8913-2E C

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 太さ100〜2000デニール,長さ3
〜30mmの針状繊維0.1〜2wt%と、ポルトラン
ドセメント20〜40wt%と、珪砂40〜60wt%
とを含有してなることを特徴とする下吹材組成物。
1. A thickness of 100 to 2000 denier and a length of 3
〜30mm needle-like fibers 0.1-2wt%, Portland cement 20-40wt%, silica sand 40-60wt%
A bottom blowing material composition comprising:
【請求項2】 躯体表面に、太さ100〜2000デニ
ール,長さ3〜30mmの針状繊維0.1〜2wt%
と、ポルトランドセメント20〜40wt%と、珪砂4
0〜60wt%とを含有してなる下吹材組成物を吹付塗
工してその塗面に針状繊維の一部を突出させた後、ポル
トランドセメント40〜60wt%と、エチレン酢酸ビ
ニル重合体と炭酸カルシウムとの組成物を発泡させた粒
子物3〜20wt%とを含有してなる上吹材組成物を吹
付塗工することを特徴とする躯体表面に外壁を形成する
工法。
2. A needle-like fiber having a thickness of 100 to 2000 denier and a length of 3 to 30 mm is 0.1 to 2 wt% on the body surface.
, Portland cement 20-40 wt%, and silica sand 4
After spray-coating a lower blowing material composition containing 0 to 60 wt% of the needle-like fibers on the coated surface, 40 to 60 wt% of Portland cement and ethylene vinyl acetate polymer A method for forming an outer wall on the surface of a skeleton, which comprises spray-coating a top blowing material composition containing 3 to 20 wt% of a particulate material obtained by foaming a composition of calcium carbonate.
JP3358288A 1991-12-27 1991-12-27 Bottom blowing material composition and method of forming outer wall on body surface Expired - Lifetime JP2534174B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3358288A JP2534174B2 (en) 1991-12-27 1991-12-27 Bottom blowing material composition and method of forming outer wall on body surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3358288A JP2534174B2 (en) 1991-12-27 1991-12-27 Bottom blowing material composition and method of forming outer wall on body surface

Publications (2)

Publication Number Publication Date
JPH05178649A JPH05178649A (en) 1993-07-20
JP2534174B2 true JP2534174B2 (en) 1996-09-11

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Country Link
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4947716B2 (en) * 2007-11-14 2012-06-06 太平洋マテリアル株式会社 Cement mortar for construction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0569782B2 (en) * 1985-09-10 1993-10-01 Nippon Kasei Chem
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