JPH05178649A - Composition of bottom spraying material and technique for forming external wall on surface of body - Google Patents
Composition of bottom spraying material and technique for forming external wall on surface of bodyInfo
- Publication number
- JPH05178649A JPH05178649A JP35828891A JP35828891A JPH05178649A JP H05178649 A JPH05178649 A JP H05178649A JP 35828891 A JP35828891 A JP 35828891A JP 35828891 A JP35828891 A JP 35828891A JP H05178649 A JPH05178649 A JP H05178649A
- Authority
- JP
- Japan
- Prior art keywords
- spraying
- blowing material
- composition
- material composition
- mortar
- 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.)
- Granted
Links
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【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 having 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 body 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 urgent 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, there is variation in the base or the operator, and as a result, the adhesive strength tends to vary. On the other hand, a method of applying mortar immediately after applying the cement paste on the body surface 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 mixing 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 interlayer strength between the obtained inorganic cured product and the inorganic cured product obtained by applying it to the surface. In most cases, the peeling / floating of the outer wall that has occurred so far has occurred at the interface between the body 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 accidental peeling and dropping of the outer wall as described above, a measure for improving the above-mentioned strengths (1) to (4) and a measure to buffer 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 cement-dispersing polymer dispersion or the like is mixed in the skeleton, or a resin mortar containing 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 the cost of raw materials is 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 joint strength cannot be obtained. That is, recently, various construction methods have been studied, such as a construction method in which irregularities are formed on the surface of a skeleton by devising a formwork, 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 above-mentioned strengths of
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 the method that can be mechanized and can perform stable work, and the outer wall obtained by the method has high strength of the above-mentioned, uniform quality of the coated mortar cured product, 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−炭酸カルシウム発泡粒子
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 denier.
~ 30 mm needle-shaped fiber 0.1-2 wt%, Portland cement 20-40 wt%, silica sand 40-60 wt%
The present invention relates to a lower blowing material composition containing: The present invention also proposes a construction method using the above-mentioned bottom blowing material composition, on the surface of the body,
0.1 to 2 wt% of 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
The present invention relates to a method for forming an outer wall on the surface of a skeleton, which comprises spray coating an upper blowing material composition containing 3% to 20% by weight of ethylene vinyl acetate-calcium carbonate foamed particles 3 to 20% by weight. ..
【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。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り、繊維の塊が発生
するため好ましくない。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. Further, the above-mentioned amount of needle-shaped fibers used may be determined within the range of 0.1 to 2 wt% in consideration of the thickness and length of the needle-shaped fibers.
Considering the mixing / dispersion in the powder or the clogging at the time of spraying work, it is preferable to use within the range of 0.1 to 1 wt%. The amount of needle fibers used is 0.1 wt%
In the following, the crack prevention effect is not sufficient, and the amount exposed on the surface is small, the biting of the upper blowing material composition is not sufficient, and the adhesive strength at the interface between the lower blowing material composition and the upper blowing material composition is low. Will be low. On the other hand, if the amount used is 2 wt% or more, it becomes difficult to disperse in the powder, and fiber lumps are generated, 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 wt%, 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 shrinkage amount 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 is constituted by containing needle fibers, Portland cement and silica sand as described above. However, 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 foam particles, and ethylene vinyl acetate-calcium carbonate foam. When the amount of the particles 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 caused by repeated cold heat and dry humidity. On the other hand, when the amount used is 20 wt% or more, the pressure feeding operation 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 on the surface thereof are also reduced. This ethylene vinyl acetate-calcium carbonate expanded particles 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 the above-mentioned upper blowing material composition can also be mixed with various additives in the same manner as 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-mentioned structure is coated. 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, in the trowel coating, the trowel pressure varies due to the operator or other factors, and the physical properties and properties are likely to be non-uniform, but in the spray coating, the trowel pressure adheres to the body surface at a constant pressure, so it is 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 (Seelex, manufactured by Fujikawa Kenzai Kogyo Co., Ltd.).
After adding 20 parts of what was diluted 5 times with water and 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 bottom blowing material composition) A material that can make the spraying workability smooth for both material feeding and spraying work ◎ For both material feeding and spraying work When the spraying was not possible and the spraying work was not possible, it was judged as x and shown in Tables 1-3.
【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) The state in which the fibers are standing in many states can be seen in the bottom blowing material. ◎ The state in which there are few fibers 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, bottom 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 lower blowing materials (Table 2), a comparison is made based on the thickness of the needle-shaped fibers. In 3), a comparison was made according to the mixing amount of needle fibers.
【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 Bottom Blowing Material Composition Examples 11, 14 and 17 in the above spray coating test was carried out. went. Table 4 shows the measured bending strength and the state of the test body at the time of the test. 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 Top Blowing Material Composition) The evaluation method is in accordance with the spray coating tests 1 and 2 of the above lower blowing material composition. 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 Composition Example 2,
The bending strength test of the upper blowing material layer obtained by using the compositions of 3, 5, 6 and Comparative Example B 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 Kogyo special compressor… 2 horsepower 2. Preparation 2-1) Dilution of Emulsion (Cyrex) For 18 kg of Cyrex, 4 tablespoons of water were mixed in an empty can of Cyrex, well stirred, 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 6 mm caliber, 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 about 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 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. A small adhesive strength tester (made by Sakuma Koki Co., Ltd.) is used for the adhesion test, and it is pulled at a right angle to the mortar surface, and the load at break is read from the hydraulic meter. In addition, 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, samples were taken from the site, and slump measurement, bending strength measurement, compression strength measurement, water absorption amount measurement, and length change measurement were performed. [Slump measurement] According to 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 for pre-mixed 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 or 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 having 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 upper blowing material to be applied 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 is possible to perform extremely quickly and efficiently without depending on a skilled worker as in the conventional case, and it is possible to mechanize the work.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｅ０４Ｆ 13/02 Ａ 8913−2Ｅ Ｃ 8913−2Ｅ //(Ｃ０４Ｂ 28/02 14:38 2102−4Ｇ 14:06） Ｚ 2102−4Ｇ (Ｃ０４Ｂ 28/02 16:08） 2102−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Internal reference number FI Technical display location E04F 13/02 A 8913-2E C 8913-2E // (C04B 28/02 14:38 2102-4G 14:06) Z 2102-4G (C04B 28/02 16:08) 2102-4G
Claims (2)
〜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
~ 30 mm needle-shaped fiber 0.1-2 wt%, Portland cement 20-40 wt%, silica sand 40-60 wt%
A bottom blowing material composition comprising:
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−炭酸カルシウム発泡粒子物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 20-40wt%, and silica sand 4
After spray-coating a lower-powder material composition containing 0 to 60 wt% of the needle-like fibers on the coating surface, Portland cement 40 to 60 wt% and ethylene vinyl acetate-carbonate 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 calcium expanded particles.
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 true JPH05178649A (en) | 1993-07-20 |
| JP2534174B2 JP2534174B2 (en) | 1996-09-11 |
Family
ID=18458518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3358288A Expired - Lifetime JP2534174B2 (en) | 1991-12-27 | 1991-12-27 | Bottom blowing material composition and method of forming outer wall on body surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2534174B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009120438A (en) * | 2007-11-14 | 2009-06-04 | Taiheiyo Material Kk | Cement mortar for building |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6259561A (en) * | 1985-09-10 | 1987-03-16 | 日本化成株式会社 | Substrate control coating material |
| JPS63303838A (en) * | 1987-06-01 | 1988-12-12 | Rasukon Kasei Kk | Admixture for undercoating mortar |
| JPH03122040A (en) * | 1989-10-06 | 1991-05-24 | Tokyo Electric Power Co Inc:The | Blowing material having quick hardening property and blowing thereof |
-
1991
- 1991-12-27 JP JP3358288A patent/JP2534174B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6259561A (en) * | 1985-09-10 | 1987-03-16 | 日本化成株式会社 | Substrate control coating material |
| JPS63303838A (en) * | 1987-06-01 | 1988-12-12 | Rasukon Kasei Kk | Admixture for undercoating mortar |
| JPH03122040A (en) * | 1989-10-06 | 1991-05-24 | Tokyo Electric Power Co Inc:The | Blowing material having quick hardening property and blowing thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009120438A (en) * | 2007-11-14 | 2009-06-04 | Taiheiyo Material Kk | Cement mortar for building |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2534174B2 (en) | 1996-09-11 |
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