JP2008050177A - Expansive cement-based joint filler for autoclaved lightweight cellular concrete board - Google Patents
Expansive cement-based joint filler for autoclaved lightweight cellular concrete board Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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Abstract
Description
本発明は、軽量気泡コンクリート板、特に床板の施工に使用する膨張セメント系目地材に関する。 The present invention relates to an expanded cement joint material used for construction of lightweight cellular concrete boards, particularly floor boards.
従来、軽量気泡コンクリート板（ＡＬＣ）の床板目地には目地材として骨材、普通セメント、保水剤、水からなる普通モルタルが使用されている。また、係る目地材においては、ＡＬＣと普通モルタルの接着性向上、ＡＬＣの吸水防止のための普通モルタル注入面下地処理（以下、「ＡＬＣ小口処理」と記す）を行っているが、その効果は十分ではなく、モルタル充填初期、ＡＬＣに普通モルタルの水分が吸収されることによる乾燥収縮、さらに普通モルタル外気接触面からの水分蒸発による乾燥収縮、セメント硬化による硬化収縮により、ＡＬＣと普通モルタルとの界面において、普通モルタル外気接触面部分から隙間が発生進行する。特許文献１には施工が容易なプレキャストパネルの目地充填材が開示されているが、係る目地充填材も上記普通モルタルと同様にＡＬＣと目地充填材との界面に隙間が発生する。また、特許文献２には低収縮セメント組成物が開示されている。しかしながら該低収縮セメント組成物を目地材として使用した場合も、上記普通モルタルと同様にＡＬＣと低収縮セメント組成物との界面に隙間が生じる。また、低収縮セメント組成物の膨張剤を増量して膨張量を大きくし、ＡＬＣと低収縮セメント組成物の隙間を防止すると、低収縮セメント組成物の膨張応力がＡＬＣの圧縮強度よりも大きな応力となりＡＬＣが破壊されてしまう恐れがある。
Conventionally, ordinary mortar made of aggregate, ordinary cement, water retention agent, and water has been used as a joint material for floor panel joints of lightweight cellular concrete boards (ALC). In addition, in the joint material, the surface treatment of the normal mortar injection surface for improving the adhesion between ALC and ordinary mortar and preventing the water absorption of ALC (hereinafter referred to as “ALC edge treatment”) is performed. It is not sufficient, and at the initial stage of mortar filling, drying shrinkage due to the absorption of water of ordinary mortar by ALC, drying shrinkage due to moisture evaporation from ordinary mortar outside air contact surface, hardening shrinkage due to cement hardening, and ALC and ordinary mortar At the interface, a gap is generated and progresses from the mortar outside air contact surface portion. Patent Document 1 discloses a joint filler for a precast panel that is easy to construct, but the joint filler also has a gap at the interface between the ALC and the joint filler as in the case of the normal mortar.
また、従来の技術ではＡＬＣ小口処理を一回で完了しているため、ほとんどの床板目地にはＡＬＣと普通モルタルとの界面に隙間が発生している。このことにより、床そのものの剛性、遮音性が低減し、ＡＬＣの剛性、遮音最大性能を生かしきれていない。前記性能を最大限に生かすために、ＡＬＣ小口処理を数回繰り返し、ＡＬＣによる普通モルタル水分の移動を防止して、ＡＬＣと普通モルタルとの界面における隙間発生を防止する工法が行われているが、ＡＬＣ小口処理に掛かる工期の延長、作業工数の増加によるコストアップにつながる。また、隙間発生防止策として、普通モルタル施工後、普通モルタルの水分蒸発を低減させ、普通モルタル自体の乾燥収縮量を抑えるシートかけ養生も行われているが、普通モルタルの硬化に時間が掛かり工期の延長になる。さらに、上記２方式ではＡＬＣの乾燥収縮と普通モルタル自体の乾燥収縮が合成し、ＡＬＣと普通モルタル界面の接着力よりも大きな応力になる場合があり、初期の隙間発生防止はできるものの長期的にはＡＬＣと普通モルタルとの界面に隙間が発生し、ＡＬＣの剛性、遮音最大性能を維持できていない。 Further, in the conventional technique, since the ALC edge processing is completed at once, a gap is generated at the interface between ALC and ordinary mortar in most floor panel joints. As a result, the rigidity and sound insulation of the floor itself are reduced, and the rigidity and maximum sound insulation performance of ALC are not fully utilized. In order to make the best use of the above performance, the ALC small-mouth treatment is repeated several times to prevent the movement of normal mortar moisture by ALC, and the method of preventing the generation of gaps at the interface between ALC and normal mortar has been carried out. , Leading to cost increase due to extension of work period for ALC small-bore processing and increase of work man-hours. In addition, as a measure to prevent gap formation, sheet aging is also performed after ordinary mortar construction to reduce moisture evaporation of ordinary mortar and reduce the amount of drying shrinkage of ordinary mortar itself. It becomes an extension of. Furthermore, in the above two methods, the drying shrinkage of ALC and the drying shrinkage of ordinary mortar itself may be combined, resulting in a stress that is greater than the adhesive force at the interface between ALC and ordinary mortar. Has a gap at the interface between ALC and ordinary mortar, and cannot maintain the rigidity and maximum sound insulation performance of ALC.
本発明の課題は、ＡＬＣ小口処理を従来の一回実施条件下でＡＬＣと目地材との界面における隙間発生を防止し、ＡＬＣの剛性、遮音最大性能を生かしつつ、ＡＬＣの乾燥収縮と目地材の長さ変化を合成した応力を低減させ、長期的隙間発生防止、現行施工期間の維持を実現することにある。 The object of the present invention is to prevent the occurrence of a gap at the interface between the ALC and the joint material under the conventional one-time treatment of the ALC, and to take advantage of the rigidity of the ALC and the maximum sound insulation performance, while the ALC dry shrinkage and the joint material. It is intended to reduce the stress that combines the length changes of the material, prevent the occurrence of long-term gaps, and maintain the current construction period.
本発明の第１は、
（ａ）骨材：１００重量部
（ｂ）ポルトランドセメント：３６〜４１重量部
（ｃ）膨張剤：０．７〜４重量部
（ｄ）増泡剤：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｅ）水溶性樹脂：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｆ）保水剤：（ｂ）１００重量部に対して０．１〜０．３重量部
（ｇ）水：１０〜２５重量部
を含有することを特徴とするＡＬＣ用膨張セメント系目地材である。
The first of the present invention is
(A) Aggregate: 100 parts by weight (b) Portland cement: 36-41 parts by weight (c) Expansion agent: 0.7-4 parts by weight (d) Foam enhancer: (b) + (c) total 100 0.5 to 3.0 parts by weight with respect to parts by weight (e) Water-soluble resin: 0.5 to 3.0 parts by weight with respect to a total of 100 parts by weight of (b) + (c) (f) Water retention agent : (B) 0.1 to 0.3 parts by weight (g) water: 10 to 25 parts by weight with respect to 100 parts by weight An expanded cement-based joint material for ALC.
本発明の第２は、
（ａ）骨材：１００重量部
（ｂ）ポルトランドセメント：３６〜４１重量部
（ｃ）膨張剤：０．７〜４重量部
（ｅ）水溶性樹脂：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｆ）保水剤：（ｂ）１００重量部に対して０．２〜０．５重量部
（ｇ）水：１０〜２５重量部
を含有することを特徴とするＡＬＣ用膨張セメント系目地材である。
The second of the present invention is
(A) Aggregate: 100 parts by weight (b) Portland cement: 36-41 parts by weight (c) Swelling agent: 0.7-4 parts by weight (e) Water-soluble resin: 100 in total of (b) + (c) 0.5 to 3.0 parts by weight with respect to parts by weight (f) Water retention agent: (b) 0.2 to 0.5 parts by weight with respect to 100 parts by weight (g) Water: 10 to 25 parts by weight This is an expanded cement joint material for ALC.
また、本発明第１及び第２の目地材においては、それぞれ（ｃ）１００重量部に対して１〜３重量部の（ｈ）石膏を添加することが好ましい。 In the first and second joint materials of the present invention, it is preferable to add 1 to 3 parts by weight of (h) gypsum to 100 parts by weight of (c).
本発明によれば、ＡＬＣの剛性、遮音最大性能を低下させることなく良好な目地を形成することができる。また本発明の目地材を用いて目地を形成したＡＬＣ床板構造においては、ＡＬＣの乾燥収縮と充填モルタルの長さ変化を合成した引っ張り残存応力を低減することができる。 According to the present invention, it is possible to form a good joint without lowering the rigidity and maximum sound insulation performance of ALC. Moreover, in the ALC floor board structure which formed the joint using the joint material of this invention, the tension | pulling residual stress which synthesize | combined the drying shrinkage of ALC and the length change of the filling mortar can be reduced.
本発明の目地材は、セメント添加剤にて目地材中の水の移動を阻害させることで該目地材の初期の乾燥収縮を低減し、初期のＡＬＣと目地材との界面における隙間発生を防止する。また、該目地材を膨張させることで、ＡＬＣと目地材の乾燥収縮合成応力を低下させ、長期的なＡＬＣと目地材との界面における隙間発生を防止する。 The joint material of the present invention reduces the initial drying shrinkage of the joint material by inhibiting the movement of water in the joint material with a cement additive, and prevents the occurrence of a gap at the interface between the initial ALC and the joint material. To do. Further, by expanding the joint material, the drying shrinkage combined stress between the ALC and the joint material is reduced, and the generation of a gap at the interface between the long-term ALC and the joint material is prevented.
本発明について、以下に具体的に説明する。 The present invention will be specifically described below.
本発明第１及び第２の目地材において共通する構成要件は以下の通りである。
（ａ）骨材：１００重量部
（ｂ）ポルトランドセメント：３６〜４１重量部
（ｃ）膨張剤：０．７〜４重量部
（ｅ）水溶性樹脂：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｇ）水：１０〜２５重量部
The configuration requirements common to the first and second joint materials of the present invention are as follows.
(A) Aggregate: 100 parts by weight (b) Portland cement: 36-41 parts by weight (c) Swelling agent: 0.7-4 parts by weight (e) Water-soluble resin: 100 in total of (b) + (c) 0.5 to 3.0 parts by weight (g) water: 10 to 25 parts by weight with respect to parts by weight
本発明第１の目地材においては、上記構成にさらに、
（ｄ）増泡剤：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｆ）保水剤：（ｂ）１００重量部に対して０．１〜０．３重量部
を加え、第２の目地材においては、上記構成にさらに、
（ｆ）保水剤：（ｂ）１００重量部に対して０．２〜０．５重量部
を加える。
In the first joint material of the present invention, in addition to the above configuration,
(D) Foam enhancer: 0.5 to 3.0 parts by weight based on 100 parts by weight of (b) + (c) (f) Water retention agent: (b) 0.1 to 100 parts by weight In addition to 0.3 parts by weight, in the second joint material, in addition to the above configuration,
(F) Water retention agent: (b) 0.2-0.5 weight part is added with respect to 100 weight part.
各構成成分について説明する。 Each component will be described.
（ａ）骨材としては、公知の細骨材、粗骨材、砕砂、砕石等を使用できる。好ましくは細骨材である。 (A) As an aggregate, a well-known fine aggregate, coarse aggregate, crushed sand, crushed stone, etc. can be used. A fine aggregate is preferable.
（ｂ）原料セメントとしては、特に限定せず、公知の各種のポルトランド系セメントを用いることができる。例えば、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩ポルトランドセメント、白色ポルトランドセメントなどが挙げられる。係るセメントは（ａ）骨材１００重量部に対して３６〜４１重量部用いる。 (B) It does not specifically limit as raw material cement, Various well-known portland type cement can be used. For example, normal Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, white Portland cement, and the like can be given. Such cement is used in an amount of 36 to 41 parts by weight per 100 parts by weight of (a) aggregate.
（ｃ）膨張剤としては、生石灰及びカルシウムサルホアミネートのいずれでも良い。添加量は、ＡＬＣ目地形状を考慮することが必要で、本発明においては、（ａ）骨材１００重量部に対して０．７〜４重量部用いられるが、現行のＡＬＣ目地形状では１〜２重量部が最も好ましい。添加量が４重量部を超えると過剰膨張によりＡＬＣ目地部が破壊され易くなってしまい、また、０．７重量部未満では膨張効果が十分に得られず、いずれも好ましくない。 (C) As the swelling agent, either quick lime or calcium sulfoamate may be used. The addition amount needs to consider the ALC joint shape, and in the present invention, (a) 0.7 to 4 parts by weight is used with respect to 100 parts by weight of the aggregate. 2 parts by weight is most preferred. If the added amount exceeds 4 parts by weight, the ALC joint part is likely to be destroyed due to excessive expansion, and if it is less than 0.7 parts by weight, the expansion effect cannot be obtained sufficiently, which is not preferable.
（ｄ）増泡剤としては、目地材の混練時、微細気泡を発生することが重要で、該微細気泡が目地材中の水分の移動を阻害し、ＡＬＣによる水分の吸水を低下させる効果がある。但し、気泡混入による比重低下で目地強度は低下する。使用される増泡剤としては、陰イオン界面活性剤、非イオン界面活性剤いずれでも良い。係る増泡剤は（ｂ）セメントと（ｃ）膨張剤との合計量１００重量部に対して０．５〜３．０重量部用いる。増泡剤の添加量が０．５重量部未満の場合には、十分な気泡が得られず、３．０重量部を超えると微細気泡が過剰に発生してＡＬＣ圧縮強度よりも目地材の圧縮強度が低い値となり、いずれも好ましくない。 (D) As the foam-increasing agent, it is important to generate fine bubbles when the joint material is kneaded, and the fine bubbles inhibit the movement of moisture in the joint material, and have the effect of reducing water absorption by ALC. is there. However, the joint strength decreases due to a decrease in specific gravity due to air bubbles. The foaming agent used may be either an anionic surfactant or a nonionic surfactant. The foam increasing agent used is 0.5 to 3.0 parts by weight with respect to 100 parts by weight of the total amount of (b) cement and (c) swelling agent. When the addition amount of the foam increasing agent is less than 0.5 parts by weight, sufficient bubbles cannot be obtained, and when it exceeds 3.0 parts by weight, excessively fine bubbles are generated and the joint material is larger than the ALC compressive strength. The compressive strength is a low value, which is not preferable.
（ｅ）水溶性樹脂としては、エチレン−酢酸ビニル系樹脂、スチレン−ブタジエン系樹脂、スチレン−（メタ）アクリル酸エステル系樹脂、（メタ）アクリル酸エステル系樹脂を使用できる。水溶性樹脂を添加することで、ＡＬＣ面と目地材面の接着力を増加させる効果及び目地材自体の亀裂を防止する効果がある。係る水溶性樹脂は（ｂ）セメントと（ｃ）膨張剤との合計量１００重量部に対して０．５〜３．０重量部用いる。水溶性樹脂の添加量が０．５重量部未満では添加効果が不十分であり、３．０重量部を超えると目地部の表面に水溶性樹脂成分がしみ出し、水溶性樹脂添加効果が低下するため、いずれも好ましくない。 (E) As the water-soluble resin, ethylene-vinyl acetate resin, styrene-butadiene resin, styrene- (meth) acrylate resin, and (meth) acrylate resin can be used. By adding the water-soluble resin, there is an effect of increasing the adhesive force between the ALC surface and the joint material surface and an effect of preventing cracking of the joint material itself. The water-soluble resin is used in an amount of 0.5 to 3.0 parts by weight based on 100 parts by weight of the total amount of (b) cement and (c) swelling agent. If the addition amount of the water-soluble resin is less than 0.5 parts by weight, the effect of addition is insufficient, and if it exceeds 3.0 parts by weight, the water-soluble resin component oozes out on the surface of the joint part and the effect of adding the water-soluble resin is reduced. Therefore, neither is preferable.
（ｆ）保水剤としては、市販のメチルセルロースが好ましく使用される。係る保水剤を第１の目地材においては（ｂ）セメント１００重量部に対して０．１〜０．３重量部添加し、第２の目地材においては（ｂ）セメント１００重量部に対して０．２〜０．５重量部添加する。第１の目地材と第２の目地材において添加量が異なる理由は増泡剤の有無である。第１の目地材では増泡剤効果により初期のＡＬＣと目地材との界面での隙間発生を防止しているが、第２の目地材ではこの効果を保水剤増量で補うものである。第１、第２の目地材のそれぞれにおいて、保水剤の添加量が上記範囲未満の場合にはＡＬＣと目地材との界面での隙間発生を低減することができず、また、上記範囲を超える場合にもＡＬＣと目地材との界面での隙間発生量が増加する傾向があり、いずれも好ましくない。 (F) Commercially available methylcellulose is preferably used as the water retention agent. In the first joint material, such a water retention agent is added in an amount of 0.1 to 0.3 parts by weight with respect to (b) 100 parts by weight of cement, and in the second joint material, (b) with respect to 100 parts by weight of cement. Add 0.2 to 0.5 parts by weight. The reason why the addition amount is different between the first joint material and the second joint material is the presence or absence of a foaming agent. In the first joint material, the generation of a gap at the interface between the initial ALC and the joint material is prevented by the foaming agent effect. In the second joint material, this effect is supplemented by an increase in the amount of the water retention agent. In each of the first and second joint materials, when the addition amount of the water retention agent is less than the above range, the generation of a gap at the interface between the ALC and the joint material cannot be reduced, and exceeds the above range. Even in this case, there is a tendency that the amount of gap generated at the interface between the ALC and the joint material increases, which is not preferable.
本発明の目地材は、上記成分に水を加えて用いる。水の添加量は（ａ）骨材１００重量部に対して１０〜２５重量部である。水の添加量が１０重量部未満の場合には充填モルタルの流動性が低下し作業性が著しく困難となり、２５重量部を超えるとＡＬＣパネル突き合わせ部分から水分がしみ出し、ひいては乾燥収縮が大きくなるため隙間発生量が増加することとなり、いずれも好ましくない。 The joint material of the present invention is used by adding water to the above components. The amount of water added is 10 to 25 parts by weight per 100 parts by weight of the aggregate (a). When the amount of water added is less than 10 parts by weight, the fluidity of the filled mortar is lowered and workability becomes extremely difficult. When the amount exceeds 25 parts by weight, moisture oozes out from the ALC panel butting portion, and drying shrinkage increases. Therefore, the gap generation amount increases, which is not preferable.
また、本発明においては、上記成分にさらに、（ｈ）石膏を加えて用いることができる。 In the present invention, (h) gypsum can be further added to the above components.
（ｈ）石膏としては、無水石膏、半水石膏、二水石膏いずれでも良いが、好ましくは二水石膏である。石膏を添加することで、石灰の水和反応を遅延させ、目地材未硬化時の膨張を抑える効果を得る。目地材未硬化時に石灰を膨張させると、目地材上部露出面に膨張応力が逃げてしまい、ＡＬＣに膨張応力を伝達する量が低下する。よって、石灰の膨張を遅延させることにより目地材の硬化を進行させた後、石灰の膨張が起こることで、ＡＬＣへの膨張応力伝達を多くする効果がある。係る石膏の添加量は、（ｃ）膨張剤１００重量部に対して１〜３重量部である。石膏の添加量が１重量部未満では上記遅延効果が十分に得られず、３重量部を超えて添加しても遅延効果の増加はなく、いずれも好ましくない。 (H) The gypsum may be any of anhydrous gypsum, hemihydrate gypsum, or dihydrate gypsum, but is preferably dihydrate gypsum. By adding gypsum, the hydration reaction of lime is delayed, and the effect of suppressing expansion when the joint material is uncured is obtained. When lime is expanded when the joint material is uncured, the expansion stress escapes to the exposed upper surface of the joint material, and the amount of the expansion stress transmitted to the ALC decreases. Therefore, after the hardening of the joint material is advanced by delaying the expansion of the lime, the expansion of the lime occurs, so that there is an effect of increasing the expansion stress transmission to the ALC. The amount of gypsum added is 1 to 3 parts by weight with respect to 100 parts by weight of the (c) swelling agent. If the amount of gypsum added is less than 1 part by weight, the above-mentioned delay effect cannot be obtained sufficiently, and even if added over 3 parts by weight, there is no increase in the delay effect, which is not preferable.
表１に示す砕石を骨材として用い、表２に示す配合割合で実施例１，２及び比較例１の目地材を用意した。比較例１の目地材は、従来の普通モルタルに相当する。 The crushed stones shown in Table 1 were used as aggregates, and the joint materials of Examples 1 and 2 and Comparative Example 1 were prepared at the mixing ratios shown in Table 2. The joint material of Comparative Example 1 corresponds to conventional ordinary mortar.
セメントは市販の普通ポルトランドセメント（宇部三菱社製）、膨張剤は石灰系の生石灰、増泡剤は陰イオン界面活性剤、水溶性樹脂はエチレン−酢酸ビニル系樹脂、保水剤は市販のメチルセルロース（信越社製）、石膏は二水石膏を用いた。これら原料を表２に示す割合で水と混合して目地材とした。 The cement is a commercially available ordinary Portland cement (manufactured by Mitsubishi Ube), the expansion agent is lime-based quicklime, the foaming agent is an anionic surfactant, the water-soluble resin is an ethylene-vinyl acetate resin, and the water retention agent is a commercially available methylcellulose ( Shin-Etsu Co., Ltd.), gypsum used dihydrate gypsum. These raw materials were mixed with water at the ratios shown in Table 2 to obtain joint materials.
上記の様に調合された実施例１、比較例１の目地材を４０ｍｍ×４０ｍｍ×１６０ｍｍ鉄製型枠に詰め、押し棒を用い締め硬めを行った。続いて半日間硬化するのを待ち、脱型し各サンプルに歪みゲージ（東京測器研究所社製）を添付し、温度２０℃、湿度６０％雰囲気下の室内に静置して長さ変化を測定した。それらの結果を図１に記載する。加えて、２８日硬化後、圧縮強度を測定した。結果を表３に記載する。圧縮強度の測定方法は以下の通りである。 The joint materials of Example 1 and Comparative Example 1 prepared as described above were packed in a 40 mm × 40 mm × 160 mm iron mold, and tightened and hardened using a push bar. After waiting for half a day to cure, the mold was removed and a strain gauge (manufactured by Tokyo Sokki Kenkyusha) was attached to each sample. Was measured. The results are shown in FIG. In addition, the compressive strength was measured after 28 days of curing. The results are listed in Table 3. The method for measuring the compressive strength is as follows.
〔圧縮強度〕
４０ｍｍ×４０ｍｍ×１６０ｍｍの試料を用い、載荷速度１ｍｍ／ｍｉｎで圧縮した強度を以下の計算式にて算出した。
[Compressive strength]
Using a sample of 40 mm × 40 mm × 160 mm, the strength compressed at a loading speed of 1 mm / min was calculated by the following calculation formula.
圧縮強度（Ｎ／ｍｍ2）＝最大荷重（Ｎ）／断面積（ｍｍ2） Compressive strength (N / mm 2 ) = Maximum load (N) / Cross sectional area (mm 2 )
実施例１と比較例１の目地材の長さ変化は、図１が示す通り、比較例１の収縮が大きいことが判る。また、圧縮強度は比較例１に対し実施例１が低下して強度的には悪化しているものの、ＡＬＣよりも強度が高いため、ＡＬＣ用目地材として問題は無いことがわかった。 The length change of the joint material of Example 1 and Comparative Example 1 shows that the shrinkage of Comparative Example 1 is large as shown in FIG. Further, although the compressive strength was lower in the strength in Example 1 than in Comparative Example 1, it was found that there was no problem as a joint material for ALC because the strength was higher than ALC.
さらに、温度２０℃、湿度６０％雰囲気下の室内に静置して、含水率調整を行ったＡＬＣ板２枚を図２に示すように端部同士突き合わせ、防水及び接着向上させるＡＬＣ小口処理を隙間が発生しない様に数回繰り返し、ＡＬＣ表面に歪みゲージの中央部と目地材１の露出面側端部との距離が１５ｍｍとなるように歪みゲージを添付した。次いで目地となる個所に上記実施例１及び比較例１の目地材を詰め、乾燥収縮によるＡＬＣ歪み残存量をそれぞれゲージより読み取って測定した。結果を表４に記載する。 Furthermore, the ALC small edge processing which improves the waterproofness and adhesion | attachment as shown in FIG. 2 by putting two ALC plates which have been left in a room with a temperature of 20 ° C. and a humidity of 60% and adjusted the moisture content. The strain gauge was attached several times so as not to generate a gap so that the distance between the center portion of the strain gauge and the exposed surface side end portion of the joint material 1 was 15 mm on the ALC surface. Next, the joint materials of Example 1 and Comparative Example 1 were filled in the joints, and the residual amounts of ALC strain due to drying shrinkage were each read from a gauge and measured. The results are listed in Table 4.
表４に示す通り、実施例１の目地材ではＡＬＣ歪みが負であるので、ＡＬＣには圧縮歪みが残存しており、比較例１ではＡＬＣ歪みが正であるので、ＡＬＣには引っ張り歪みが残存している。このことより、ＡＬＣと比較例１の目地材との界面が密着している場合、前記残存歪みとＡＬＣ乾燥収縮が合一されるため、ＡＬＣと比較例１の目地材との界面では接着維持限界強度に近い状態となり、ＡＬＣに若干外力が加わることで、容易に界面に隙間を生じさせることにつながる。しかしながら、実施例１の目地材では、ＡＬＣに圧縮歪みが残存しているので、最大乾燥収縮（飽水状態から気乾状態のＡＬＣ歪み）を合一しても、ＡＬＣと実施例１の目地材との界面では接着維持限界強度に近い状態にはならないので、ＡＬＣに若干外力が加わっても隙間が発生することはない。 As shown in Table 4, since the ALC strain is negative in the joint material of Example 1, the compressive strain remains in ALC, and the ALC strain is positive in Comparative Example 1, so that the ALC has tensile strain. Remains. Accordingly, when the interface between the ALC and the joint material of Comparative Example 1 is in close contact, the residual strain and the ALC drying shrinkage are united, so that the adhesion is maintained at the interface between the ALC and the joint material of Comparative Example 1. It becomes a state close to the limit strength, and a slight external force is applied to the ALC, which easily leads to a gap at the interface. However, in the joint material of Example 1, since the compressive strain remains in ALC, even if the maximum drying shrinkage (ALC strain from saturated to air-dried state) is united, the joint of ALC and Example 1 is used. Since it does not become close to the adhesion maintenance limit strength at the interface with the material, no gap is generated even if a slight external force is applied to the ALC.
続いて、従来施工している条件下でのＡＬＣを用い、ＡＬＣに対する各例の目地材の影響を確認した。ＡＬＣの小口処理を現行方法で行い、ＡＬＣ表面に歪みゲージを詰め部分から１５ｍｍ部分に複数枚添付し、実施例１，２、比較例１の各目地材を目地となる個所に詰め込み、１ヶ月硬化させた後、ＡＬＣ歪み残存量を測定した。結果を表５に記載する。 Then, the influence of the joint material of each example with respect to ALC was confirmed using ALC under the conditions currently applied. ALC small edge treatment is carried out by the current method, a plurality of strain gauges are attached to the ALC surface from the stuffed portion to the 15 mm portion, and the joint materials of Examples 1 and 2 and Comparative Example 1 are stuffed into the joint locations, 1 month After curing, the remaining amount of ALC strain was measured. The results are listed in Table 5.
表５に示すように、実施例１、実施例２の目地材では、ＡＬＣにほぼ同等の圧縮応力が残存していることを確認した。比較例１の目地材ではＡＬＣへの影響はなくＡＬＣの歪みは確認されなかった。これは、ＡＬＣと比較例１の目地材との界面に隙間が発生しているため、ＡＬＣの歪みが解放されたためである。 As shown in Table 5, it was confirmed that substantially the same compressive stress remained in the ALC in the joint materials of Example 1 and Example 2. The joint material of Comparative Example 1 had no effect on ALC and no ALC distortion was observed. This is because a gap is generated at the interface between the ALC and the joint material of Comparative Example 1, so that the distortion of the ALC is released.
さらに、ＡＬＣと実施例１、実施例２、比較例１の各目地材との界面の隙間を確認するため、ＡＬＣを図２の様に目地方向垂直に切断し、切断面のＡＬＣと実施例１、実施例２、比較例１の各目地材との界面部分を観察した。図２中、１は目地材、２はＡＬＣ、ａ，ａ’，ｂ，ｂ’はＡＬＣ２と目地材１との界面である。その結果、実施例１の目地材ではＡＬＣと目地材との界面に隙間が発生せず、図２中のａ面、ａ’面が密着していることを確認した。また、比較例１の目地材では、図２中のＡＬＣと目地材との界面（ａ面、ａ’面）切断ラインを１０割とし、ＡＬＣと目地材との界面に隙間が発生している長さを測定すると約８割であることを確認した。また、同様にして、実施例２の目地材では、約２割であることを確認した。
Further, in order to confirm the gap at the interface between the ALC and each joint material of Example 1, Example 2, and Comparative Example 1, the ALC was cut perpendicular to the joint direction as shown in FIG. 1, the interface part with each joint material of Example 2 and the comparative example 1 was observed. In FIG. 2, 1 is a joint material, 2 is an ALC, and a, a ′, b, and b ′ are interfaces between the
本発明第１の目地材で使用する増泡剤には、ＡＬＣ吸水による目地材中の水分の移動を阻害し、詰め込み初期の乾燥収縮を抑える効果があり、実施例１の目地材で示されるように、ＡＬＣと目地材との界面における初期の隙間発生を防止することができる。 The foam increasing agent used in the first joint material of the present invention has an effect of inhibiting the movement of moisture in the joint material due to ALC water absorption and suppressing drying shrinkage at the initial stage of packing, and is shown by the joint material of Example 1. As described above, it is possible to prevent the initial gap from being generated at the interface between the ALC and the joint material.
また、本発明第２の目地材では、実施例２に示されるように、保水剤を増量することでＡＬＣの吸水を防止し、ＡＬＣと目地材との界面に発生する隙間を約２割まで低減することができる事を確認した。本発明第２の目地材では、ＡＬＣと目地材との界面において初期に発生する隙間を完全に防止することはできないものの、表３に示す通り、目地自体の強度が高く、剛性、遮音性向上に効果がある。 Further, in the second joint material of the present invention, as shown in Example 2, by increasing the water retention agent, ALC water absorption is prevented, and the gap generated at the interface between the ALC and the joint material is up to about 20%. It was confirmed that it could be reduced. In the second joint material of the present invention, the initial gap at the interface between the ALC and the joint material cannot be completely prevented, but the strength of the joint itself is high as shown in Table 3, and the rigidity and sound insulation are improved. Is effective.
１ 目地材
２ ＡＬＣ
ａ，ａ’，ｂ，ｂ’ 目地材とＡＬＣとの界面
1
a, a ', b, b' Interface between joint material and ALC
Claims (4)
（ｂ）ポルトランドセメント：３６〜４１重量部
（ｃ）膨張剤：０．７〜４重量部
（ｄ）増泡剤：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｅ）水溶性樹脂：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｆ）保水剤：（ｂ）１００重量部に対して０．１〜０．３重量部
（ｇ）水：１０〜２５重量部
を含有することを特徴とする軽量気泡コンクリート板用膨張セメント系目地材。 (A) Aggregate: 100 parts by weight (b) Portland cement: 36-41 parts by weight (c) Expansion agent: 0.7-4 parts by weight (d) Foam enhancer: (b) + (c) total 100 0.5 to 3.0 parts by weight with respect to parts by weight (e) Water-soluble resin: 0.5 to 3.0 parts by weight with respect to a total of 100 parts by weight of (b) + (c) (f) Water retention agent : (B) 0.1 to 0.3 parts by weight (g) water: 10 to 25 parts by weight with respect to 100 parts by weight An expanded cement-based joint material for lightweight cellular concrete boards.
（ｂ）ポルトランドセメント：３６〜４１重量部
（ｃ）膨張剤：０．７〜４重量部
（ｅ）水溶性樹脂：（ｂ）＋（ｃ）の合計１００重量部に対して０．５〜３．０重量部
（ｆ）保水剤：（ｂ）１００重量部に対して０．２〜０．５重量部
（ｇ）水：１０〜２５重量部
を含有することを特徴とする軽量気泡コンクリート板用膨張セメント系目地材。 (A) Aggregate: 100 parts by weight (b) Portland cement: 36-41 parts by weight (c) Swelling agent: 0.7-4 parts by weight (e) Water-soluble resin: 100 in total of (b) + (c) 0.5 to 3.0 parts by weight with respect to parts by weight (f) Water retention agent: (b) 0.2 to 0.5 parts by weight with respect to 100 parts by weight (g) Water: 10 to 25 parts by weight An expanded cement joint material for lightweight cellular concrete boards, characterized by:
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| JP2012140777A (en) * | 2010-12-28 | 2012-07-26 | Taiheiyo Material Kk | Joint sealer for building |
| CN105236869A (en) * | 2014-07-08 | 2016-01-13 | 上海城建物资有限公司 | Special high strength grouting material for connecting reinforcement sleeve |
| CN112456894A (en) * | 2020-12-21 | 2021-03-09 | 深圳市星耀福实业有限公司 | High-cohesiveness interface agent special for ALC board wall and manufacturing method thereof |
| CN113336512A (en) * | 2021-06-18 | 2021-09-03 | 太原钢铁(集团)有限公司 | Gypsum-based anti-cracking mortar for aerated concrete slabs and preparation method thereof |
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| Publication number | Publication date |
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| JP4932383B2 (en) | 2012-05-16 |
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