JP4308513B2 - Elastic cement mortar formulation for tiling - Google Patents
Elastic cement mortar formulation for tiling Download PDFInfo
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- JP4308513B2 JP4308513B2 JP2002362421A JP2002362421A JP4308513B2 JP 4308513 B2 JP4308513 B2 JP 4308513B2 JP 2002362421 A JP2002362421 A JP 2002362421A JP 2002362421 A JP2002362421 A JP 2002362421A JP 4308513 B2 JP4308513 B2 JP 4308513B2
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- mortar
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Description
【0001】
【発明の属する技術分野】
この発明は、耐候性と変形追従性及び接着耐久性に優れ、接着強度が高い弾性セメントモルタル用配合物に関する。
【0002】
【従来の技術】
コンクリートその他の下地材にタイル張りを行う場合、従来は下地材より高強度で高剛性の材料が好ましいものとして用いられていたが、日射による温度変化や下地の乾燥収縮による挙動によってタイルの接着界面では繰返しせん断応力を受けるため接着力が次第に低下する他、ひび割れや疲労破壊が生じ易くなることが知られている。
この反省にたって人工軽量発泡細骨材を用いて圧縮強度・ヤング率ともに従来の1/2以下としたタイル貼り用軽量モルタルが提案されている(特許文献1、(0009)参照)が、同提案は主としてモルタルの軽量化による塗付け作業の向上とヤング率を低下させることを目的としているため(特許文献1、(0014)参照)モルタルの伸び性能が小さく、吸水量が多くなり、モルタル自体の強度が低下する欠点がある。
【0003】
【特許文献1】
特開平10−299220号公報
【0004】
【発明が解決しようとする課題】
本発明は、直張り工法においても良好な作業性があり、硬化後も大きな変形追従性によって下地の収縮・膨張などの挙動を緩和吸収して張付けたタイルの割れや浮き・剥落を長期に亘って防止できる高弾性セメントモルタルを提供するものである。
【0005】
【課題を解決するための手段】
本発明者等は、上記課題を解決できるモルタルを開発すべく、種々実験したところ、上記の性能を備えるモルタルとしてモルタル層の伸び歪み率を下地材の通常の挙動範囲(100μ)を2倍以上(200μ以上)とし、静弾性係数を従来セメントの1/2以下(10,000N/mm2以下)とすることが有効であることを確認して本発明に至った。
本発明弾性セメントモルタル配合物は、セメント、天然硅砂、短繊維、混和剤及び軽量骨材などが配合されて組成される。
天然硅砂は、セメントに対し50重量%であり、短繊維としては繊維長2〜10mmのポリビニルアルコール繊維(ビニロン繊維)、ポリエステル繊維、アクリル繊維、ナイロン繊維、炭素繊維、鋼繊維、耐アルカリガラス繊維などが使用でき、セメント量に対する添加量は、0.2重量%以上2.0重量%までの範囲である。 短繊維は、モルタルの伸び歪み率の向上や塗布時のズレをなくし、更に硬化後のモルタルの亀裂防止とタイルの剥落防止のために混合するものであるが、2.0重量%以上混合するとモルタルの混練が困難になる上、タイル張りした際目地に繊維が露出することがあり好ましくない。
混和剤は、セメント混和用ポリマーディスパージョン又は再乳化形粉末樹脂であってエチレン酢酸ビニル、酢酸ビニルベオバ、アクリル酸エステル共重合体、スチレンブタジエンラバー(SBR)など一般のセメント混和剤であるが、ガラス転移温度が−50〜10℃であるものを使用し、セメントに対する混合量を固形分換算で5〜50重量%の範囲とする。
軽量骨材には、有機質及び/又は無機質材が使用できるが、モルタルの静弾性係数を抑えるため、粒径を0.075〜1.2mmの範囲とする。粒径が0.075mm以下では水量が増してモルタル強度を低下させ、1.2mm以上ではモザイクタイルのようなタイル張りでは塗り厚が3〜5mmと薄いため採用できない。
軽量骨材の配合量は、前記セメント、天然硅砂及び軽量骨材自身の合計容量に対し、20容量%を超えない範囲で添加する。 20容量%以上添加すると強度が低下する。
混練モルタルとするときの水量は、材料に対し通常20〜35重量%である。
本発明配合物によるモルタルは、硬化後、伸び歪み率が200μ以上となる上、静弾性係数が10,000N/mm2以下となってタイル接着界面に生じるせん断剥離応力の緩和・吸収性能が向上する。
【0006】
【実施例】
(実施例と比較例)
表1に示す、実施例及び比較例の夫々についてモルタルを調整すると共にその一部を用いて試料体を作製した。
【0007】
【表1】
【0008】
(比較試験)
各供試体について伸び歪み率・引張強さ、静弾性係数、圧縮強さ、接着強さ、耐久性試験後接着強さ及びタイル剥落防止性能などについて測定すると共に特性試験をしたところ表2及び図1のような結果が得られた。
【0009】
(試験項目の内容)
「伸び歪み・引張強さ」:ASTM C190−85の試験方法に準拠し、ブリケットによる引張試験を行い伸び歪み率を測定した。
「静弾性係数」:JSCE−G502に準じ、50φ×100mmの円柱供試体を用い、単軸圧縮載荷により1/3応力点と50με時の応力点を結ぶ割線弾性係数より求めた。
「曲げ・圧縮強さ」:JIS A6203(セメント混和用ポリマーディスパージョン及び再乳化形粉末樹脂)に準拠して測定した。
「接着強さ」:JIS A5303(鉄筋コンクリートU形)1種に適合するコンクリート製U字溝蓋の上面に、吸水調整材として「NSハイフレックスHF−1000(日本化成社製)」の5倍希釈液を1回刷毛塗り乾燥後、その上に試料モルタルを金鏝により塗付け、タイル「INAX製YM−255(45×95×6)mm」を張付けた。
28日後に接着強さを測定した。
「耐久性後接着強さ」:JIS A5303の1種に適合するコンクリート製U字溝蓋の上面に、吸水調整材として「NSハイフレックスHF−1000(日本化成社製)」の5倍希釈液を1回刷毛塗り乾燥後、その上に試料モルタルを金鏝により塗付け、タイル「INAX製YM−255(45×95×6)mm」を張付けた。
材齢28日後、20℃水中18時間、−20℃気中3時間、50℃気中3時間を1サイクルとして、10サイクル行った後、接着強さを測定した。
「作業性」:コンクリート壁(1m2以上)に各試料モルタルを金鏝で塗付け、作業者の官能により塗付け時の作業性と前記タイルの張付け時のタイルのズレについて評価を行った。
「タイル剥落防止性能」:所定の割合(fc=44N/mm2,W/C=43.5%)で打設したコンクリート角柱(100×100×350)mmの一面に厚さ1mmの下塗りを施した後、更に4mm厚の上塗りを行って張付けモルタルとし、その上に50角モザイクタイル(45×45×6)mmを密着張りした。
湿空24時間、気中で27日間養生した後、万能試験機によりコンクリートが破壊するまで単軸圧縮載荷し、中央部のコンクリート表面とタイル表面の歪を測定した。
【0010】
(試験結果)
【表2】
【0011】
(評価)
引張強さ:引張強さは比較例品より低下するが、伸び歪み率は、いずれの実施例品も、200μ以上であって比較例品の2倍以上である。
静弾性係数:モルタルの柔らかさを示す静弾性係数は、10,000N/mm2より遥かに低く、従来の張付けモルタルの約1/4である。
圧縮強さと接着強さ:圧縮強さは比較例品の1/2程度であるが、接着強さは同等かそれ以上である。
耐久性試験後接着強さ:1.6N/mm2以上であるから実用上十分な接着耐久性を維持する。
作業性:タイルのズレがほとんど無く、塗り付け作業性が極めてよい。
タイル剥落防止性能:図1の軸方向歪み追従性試験結果から判るように、実施例品はコンクリートに生じている歪に対し、タイルに生じている歪が少ない。
このことは、低い静弾性係数の実施例モルタルが応力の緩和・吸収性能を発揮していることを示している。
また、タイル歪が最大値を超えた後の減少過程が、緩やかであることは、実施例モルタル配合物が靭性に富み脆性破壊を生じていないことを示している。
【0012】
本発明におけるタイルの浮き・剥落防止効果は、モルタルにガラス転移温度が−50〜10℃のセメント混和用ポリマーディスパージョン又は再乳化形粉末樹脂がセメントに対し、固形分換算で5〜50重量%混合されると共に粒径0.075〜1.2mmの軽量骨材が全材料に対し、20容量%を超えない範囲で添加され、モルタル配合物の伸び歪み率を200μ以上とし、静弾性係数を10,000N/mm2以下としたことに基づくものである。なお、軽量骨材の添加は静弾性係数が抑える効果と共に作業性を良好にする効果がある。
【0013】
【発明の効果】
本発明によるモルタルは、コンクリート下地材に直接塗り付けする際の鏝作業が容易になり、またタイル張付け時にズレを生じないから張付け作業が効率よく行える。
更に、接着強さも従来品と同等である上、伸び歪み率200μ以上、静弾性係数10,000N/mm2以下にされていることにより接着耐久性が向上し、下地材の乾燥収縮や膨張・収縮などの挙動を緩和吸収し又はこれに追随して張付けタイルを保護するので長期に亘ってタイルの浮き・剥落事故を防止できる。
本発明モルタルは、タイル張付け材の他、下地補修材、下塗材及び仕上塗材として利用できる。
【図面の簡単な説明】
【図1】 コンクリート歪に対するタイル歪の関係を示すグラフ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blend for elastic cement mortar that has excellent weather resistance, deformation followability, adhesion durability, and high adhesive strength.
[0002]
[Prior art]
In the past, when tiled concrete or other base materials, materials with higher strength and higher rigidity than the base materials were used as preferred materials. However, it is known that the adhesive force gradually decreases due to repeated shear stress, and cracks and fatigue failure are likely to occur.
In light of this reflection, a lightweight mortar for tiling has been proposed (see Patent Document 1, (0009)), which uses artificial lightweight foamed fine aggregate and has both compressive strength and Young's modulus ½ or less of the conventional one. The proposal is mainly aimed at improving the coating work by reducing the weight of the mortar and lowering the Young's modulus (see Patent Document 1, (0014)). The mortar's elongation performance is small, the amount of water absorption increases, and the mortar itself. There is a drawback in that the strength of the material decreases.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-299220
[Problems to be solved by the invention]
The present invention has good workability even in the direct tension construction method, and even after curing, the deformation, absorption, and other behaviors of the base are relaxed and absorbed by the large deformation followability, and cracking, floating, and peeling of the tiles attached over a long period of time. there is provided a high elastic cement mortar prevents Te.
[0005]
[Means for Solving the Problems]
The present inventors conducted various experiments to develop a mortar capable of solving the above-mentioned problems. As a mortar having the above-mentioned performance, the elongation strain rate of the mortar layer is more than twice the normal behavior range (100 μ) of the base material. (200 μm or more) and the static elastic modulus was confirmed to be effective to be 1/2 or less of conventional cement (10,000 N / mm 2 or less), and the present invention was achieved.
The elastic cement mortar composition of the present invention is composed of cement, natural cinnabar, short fibers, admixture, lightweight aggregate and the like.
Natural cinnabar is 50% by weight with respect to cement, and the short fibers are polyvinyl alcohol fibers (vinylon fibers) with a fiber length of 2 to 10 mm, polyester fibers, acrylic fibers, nylon fibers, carbon fibers, steel fibers, and alkali-resistant glass fibers. The amount added to the cement amount is in the range of 0.2 wt% to 2.0 wt%. Short fibers eliminates the deviation during improvement and coating elongation distortion rate of the mortar, but is intended to be mixed for yet spalling prevention of crack prevention and tile mortar after curing when mixed 2.0 wt% or more It is not preferable because kneading of mortar becomes difficult and fibers may be exposed at the joints when tiled.
The admixture is a polymer dispersion for cement admixture or a re-emulsifying powder resin , and is a general cement admixture such as ethylene vinyl acetate, vinyl acetate beoba, acrylate copolymer, and styrene butadiene rubber (SBR). A transition temperature of −50 to 10 ° C. is used, and the mixing amount with respect to cement is set to a range of 5 to 50% by weight in terms of solid content.
An organic and / or inorganic material can be used for the lightweight aggregate, but the particle size is set in the range of 0.075 to 1.2 mm in order to suppress the static elastic modulus of the mortar . If the particle size is 0.075 mm or less, the amount of water increases and the mortar strength decreases. If the particle size is 1.2 mm or more, the tile thickness such as mosaic tiles is thin and the thickness is 3 to 5 mm.
The light-weight aggregate is added in a range not exceeding 20% by volume with respect to the total capacity of the cement, natural cinnabar sand and the light-weight aggregate itself . Addition of 20% by volume or more decreases strength.
The amount of water when kneading mortar is usually 20 to 35% by weight with respect to the material.
After curing, the mortar according to the composition of the present invention has an elongation strain rate of 200 μm or more and a static elastic modulus of 10,000 N / mm 2 or less to improve the relaxation / absorption performance of shear peeling stress generated at the tile bonding interface. .
[0006]
【Example】
(Examples and comparative examples)
For each of the examples and comparative examples shown in Table 1, a mortar was prepared and a sample body was prepared using a part thereof.
[0007]
[Table 1]
[0008]
(Comparative test)
Each specimen was measured for elongation strain rate / tensile strength, static elastic modulus, compressive strength, adhesive strength, adhesion strength after durability test and tile peeling prevention performance, and a characteristic test was conducted. A result like 1 was obtained.
[0009]
(Contents of test items)
"Elongation strain / tensile strength": Based on the test method of ASTM C190-85, a tensile test with briquette was performed to measure the elongation strain rate.
“Static modulus”: According to JSCE-G502, a cylindrical specimen having a diameter of 50 × 100 mm was used, and the modulus was obtained from the secant modulus connecting the 1/3 stress point and the stress point at 50 με by uniaxial compression loading.
“Bending / compressive strength”: Measured according to JIS A6203 (polymer dispersion for cement admixture and re-emulsified powder resin).
"Adhesive strength": 5 times dilution of NS NS After the liquid was brushed and dried once, a sample mortar was applied on the top with a hammer, and a tile “YAX-M made by INAX (255 × 95 × 6) mm” was attached.
The adhesive strength was measured after 28 days.
“Adhesive strength after durability”: 5 times diluted solution of “NS Hiflex HF-1000 (manufactured by Nippon Kasei Co., Ltd.)” on the top surface of concrete U-shaped groove lid conforming to JIS A5303. After brush-drying, the sample mortar was applied with a hammer and the tile “YAX-255 (45 × 95 × 6) mm made by INAX” was pasted thereon.
After 28 days of age, the adhesive strength was measured after 10 cycles of 20 cycles at 20 ° C. in water, 3 hours in the atmosphere at −20 ° C. and 3 hours in the atmosphere at 50 ° C.
“Workability”: Each sample mortar was applied to a concrete wall (1 m 2 or more) with a metal hammer, and the workability at the time of application and the displacement of the tile at the time of the tile attachment were evaluated by the operator's sense.
“Tile exfoliation prevention performance”: An undercoat with a thickness of 1 mm is applied to one side of a concrete prism (100 × 100 × 350) mm placed at a predetermined ratio (fc = 44 N / mm 2 , W / C = 43.5%). After the application, a 4 mm thick top coat was applied to form a mortar, and 50 square mosaic tiles (45 × 45 × 6) mm were adhered on the top.
After curing in the air for 24 hours in a humid atmosphere for 27 days, the uniaxial compression loading was performed until the concrete was broken by a universal testing machine, and the strain on the concrete surface and tile surface in the central part was measured.
[0010]
(Test results)
[Table 2]
[0011]
(Evaluation)
Tensile strength: Tensile strength is lower than that of the comparative example product, but the elongation strain rate is 200 μm or more for each of the example products and is twice or more that of the comparative product.
Static elastic modulus: The static elastic modulus indicating the softness of the mortar is much lower than 10,000 N / mm 2 and is about 1/4 of the conventional mortar.
Compressive strength and adhesive strength: The compressive strength is about ½ of the comparative example product, but the adhesive strength is equal to or higher than that.
Adhesive strength after durability test: 1.6 N / mm 2 or more, so that practically sufficient adhesion durability is maintained.
Workability: There is almost no displacement of the tiles, and the painting workability is extremely good.
Tile exfoliation prevention performance: As can be seen from the results of the axial strain followability test in FIG. 1, the example products have less distortion in the tile than the distortion in the concrete.
This indicates that the example mortar having a low static elastic modulus exhibits the stress relaxation / absorption performance.
In addition, the gradual decrease process after the tile strain exceeds the maximum value indicates that the example mortar formulation is rich in toughness and does not cause brittle fracture.
[0012]
In the present invention, the effect of preventing the tiles from floating and peeling off is 5 to 50% by weight in terms of solid content with respect to the cement dispersion polymer dispersion or re-emulsified powder resin having a glass transition temperature of −50 to 10 ° C. in mortar. A lightweight aggregate having a particle size of 0.075 to 1.2 mm is added within a range not exceeding 20% by volume with respect to all materials, the elongation strain rate of the mortar composition is 200 μm or more, and the static elastic modulus is This is based on being 10,000 N / mm 2 or less. The addition of lightweight aggregate has the effect of improving workability as well as the effect of suppressing the static elastic modulus.
[0013]
【The invention's effect】
The mortar according to the present invention facilitates the wrinkling work when directly applying to the concrete base material, and can be applied efficiently because there is no displacement during tile application.
Furthermore, the adhesive strength is equal to that of the conventional product, and the elongation durability is 200 μm or more, and the static elastic modulus is 10,000 N / mm 2 or less, thereby improving the adhesion durability, and drying shrinkage and expansion of the base material. Since the tile is protected by absorbing or mitigating the behavior such as shrinkage, it is possible to prevent the tile from being lifted or peeled off over a long period of time.
The mortar of the present invention can be used as a base repair material, an undercoat material, and a finish coating material, in addition to a tile tension material.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between tile strain and concrete strain.
Claims (1)
Priority Applications (1)
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JP2002362421A JP4308513B2 (en) | 2002-12-13 | 2002-12-13 | Elastic cement mortar formulation for tiling |
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JP2002362421A JP4308513B2 (en) | 2002-12-13 | 2002-12-13 | Elastic cement mortar formulation for tiling |
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JP4308513B2 true JP4308513B2 (en) | 2009-08-05 |
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Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006273597A (en) * | 2005-03-28 | 2006-10-12 | Sumitomo Osaka Cement Co Ltd | Polymer cement mortar for tile adhesion |
JP5305071B2 (en) * | 2008-06-19 | 2013-10-02 | 株式会社Nttファシリティーズ | Installation structure and installation method of metal plate integrated solar cell |
JP2010076975A (en) * | 2008-09-26 | 2010-04-08 | Kajima Corp | Mortar kneaded product for tiling and tiled concrete structure |
JP2010132477A (en) * | 2008-12-03 | 2010-06-17 | Taiheiyo Materials Corp | Adhesive material for tile |
JP5276974B2 (en) * | 2008-12-25 | 2013-08-28 | 太平洋マテリアル株式会社 | Large tile adhesive |
JP6203546B2 (en) * | 2013-06-13 | 2017-09-27 | 太平洋マテリアル株式会社 | Polymer cement mortar and method using polymer cement mortar |
JP6438738B2 (en) * | 2014-11-04 | 2018-12-19 | 太平洋マテリアル株式会社 | Tile adhesive |
JP6508789B2 (en) * | 2017-08-29 | 2019-05-08 | 太平洋マテリアル株式会社 | Method using polymer cement mortar and polymer cement mortar |
JP2020197081A (en) * | 2019-06-04 | 2020-12-10 | 菊水化学工業株式会社 | Construction method of sheet-like mounting material |
CN113233905B (en) * | 2021-05-24 | 2022-07-26 | 重庆唯美陶瓷有限公司 | Preparation method of ceramic tile and ceramic tile |
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2002
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