JP2017210407A - Polymer cement mortar and method using polymer cement mortar - Google Patents
Polymer cement mortar and method using polymer cement mortar Download PDFInfo
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- Working Measures On Existing Buildindgs (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、例えばコンクリート構造物の補修に用いられるポリマーセメントモルタルに関する。 The present invention relates to a polymer cement mortar used for repairing a concrete structure, for example.
コンクリート構造物（例えば、鉄筋コンクリート（ＲＣ）床版やボックスカルバートの中床版などの床版、壁、天井部）には、疲労や乾燥収縮により、ひび割れが生じる。この種の劣化の進行や、ひび割れのすり合わせによって、ひび割れ幅が大きくなると、そこから水や塩化物イオン等の劣化因子がコンクリート構造物内に侵入する。この結果、鉄筋が腐食する。すなわち、ひび割れによる損傷を放置していると、最終的に鉄筋が腐食して断面欠損し、構造物の安全性が保てなくなる。この為、劣化した箇所を除去した後、その凹部に補修材を充填することが行われている。 Cracks occur in concrete structures (for example, floor slabs such as reinforced concrete (RC) floor slabs and box slabs, walls, and ceilings) due to fatigue and drying shrinkage. When the crack width increases due to the progress of this type of degradation or cracking, degradation factors such as water and chloride ions enter the concrete structure. As a result, the reinforcing bars corrode. In other words, if damage caused by cracks is left untreated, the reinforcing bars will eventually corrode and the cross section will be lost, and the safety of the structure will not be maintained. For this reason, after removing the deteriorated part, filling the repair material into the concave portion is performed.
前記補修材あるいは補強材として、ポリマーセメントモルタルが提案されている。特に、早期施工を目的として、初期強度発現性を向上させた急硬性を有する急硬性ポリマーセメントモルタルが提案されている（特許文献１，２）。 Polymer cement mortar has been proposed as the repair material or the reinforcing material. In particular, for the purpose of early construction, a rapid-curing polymer cement mortar having rapid hardening with improved initial strength has been proposed (Patent Documents 1 and 2).
しかしながら、従来提案のポリマーセメントモルタルが用いられた場合では、ひび割れ対策が十分では無く、例えば中性化および塩化物イオンの抵抗性が悪い等の問題が認められた。 However, when the conventionally proposed polymer cement mortar is used, measures against cracking are not sufficient, and problems such as neutralization and poor resistance to chloride ions have been observed.
従って、本発明が解決しようとする課題は、流動性が良く、凹部内への充填性は良く、かつ、充填された場合の表面平坦性に優れ、更には硬化体の機械的強度に優れ、しかも硬化体の収縮度合も大きくなく、又、塩化物浸透深さや中性化深さが小さいポリマーセメントモルタルを提供することである。 Therefore, the problem to be solved by the present invention is that the fluidity is good, the filling property into the recesses is good, the surface flatness when filled, and the mechanical strength of the cured body is excellent, Moreover, it is to provide a polymer cement mortar which does not have a large degree of shrinkage of the cured body and has a small chloride penetration depth and a neutralization depth.
本発明者らは、鋭意検討を重ねた結果、水／セメント、ポリマー／セメント、細骨材／セメント、及び軽量骨材／細骨材の割合を考慮すると、前記の課題が大きく改善されることを見出すに至り、本発明を完成するに至った。 As a result of intensive studies, the present inventors have greatly improved the above problems when considering the ratio of water / cement, polymer / cement, fine aggregate / cement, and lightweight aggregate / fine aggregate. As a result, the present invention has been completed.
すなわち、本発明は、
セメントと、セメント用ポリマーと、骨材と、水とを含有するポリマーセメントモルタルであって、
前記骨材には、軽量骨材に分類される骨材と、細骨材に分類される骨材とが含まれてなり、
水（質量）／セメント（質量）が１８〜４５％、ポリマー（質量）／セメント（質量）が１０〜２８、細骨材（容積）／セメント（質量）が０．３〜１．２、軽量骨材（容積）／全骨材（容積）が０．４〜０．９である
ポリマーセメントモルタルを提案する。
That is, the present invention
A polymer cement mortar containing cement, a cement polymer, an aggregate, and water,
The aggregate includes an aggregate classified as a lightweight aggregate and an aggregate classified as a fine aggregate,
Water (mass) / cement (mass) 18-45%, polymer (mass) / cement (mass) 10-28, fine aggregate (volume) / cement (mass) 0.3-1.2, lightweight A polymer cement mortar with an aggregate (volume) / total aggregate (volume) of 0.4 to 0.9 is proposed.
本発明は、好ましくは、前記セメントが急硬性セメントであって、前記ポリマーセメントモルタルが急硬性ポリマーセメントモルタルであるポリマーセメントモルタルを提案する。 The present invention preferably proposes a polymer cement mortar in which the cement is a quick setting cement and the polymer cement mortar is a quick setting polymer cement mortar.
本発明は、前記ポリマーセメントモルタルであって、好ましくは、前記セメント用ポリマーがゴムの群の中から選ばれる一種または二種以上であるポリマーセメントモルタルを提案する。 The present invention proposes a polymer cement mortar, preferably the polymer cement mortar, wherein the cement polymer is one or more selected from the group of rubbers.
本発明は、前記ポリマーセメントモルタルであって、好ましくは、前記セメント用ポリマーが、スチレン・ブタジエン共重合体、クロロプレンゴム、アクリルニトリル・ブタジエン共重合体、メチルメタクリレート・ブタジエン共重合体の群の中から選ばれる合成ゴム、天然ゴム、ポリオレフィン、ポリクロロピレン、ポリアクリル酸エステル、スチレン・アクリル共重合体、オールアクリル共重合体、酢酸ビニル系樹脂、不飽和ポリエステル樹脂、ポリウレタン樹脂、アルキド樹脂、エポキシ樹脂、瀝青質の群の中から選ばれる一種または二種以上であるポリマーセメントモルタルを提案する。 The present invention is the polymer cement mortar, wherein the cement polymer is preferably selected from the group consisting of a styrene / butadiene copolymer, a chloroprene rubber, an acrylonitrile / butadiene copolymer, and a methyl methacrylate / butadiene copolymer. Synthetic rubber, natural rubber, polyolefin, polychloropyrene, polyacrylic ester, styrene / acrylic copolymer, all acrylic copolymer, vinyl acetate resin, unsaturated polyester resin, polyurethane resin, alkyd resin, epoxy resin A polymer cement mortar that is one or more selected from the group of bituminous is proposed.
本発明は、前記ポリマーセメントモルタルであって、好ましくは、前記軽量骨材が無機発泡系骨材であるポリマーセメントモルタルを提案する。 The present invention proposes a polymer cement mortar, preferably a polymer cement mortar in which the lightweight aggregate is an inorganic foam-based aggregate.
本発明は、前記ポリマーセメントモルタルを用いて補修または補強する工法を提案する。 The present invention proposes a method of repairing or reinforcing using the polymer cement mortar.
本発明は、コンクリート構造物の劣化部を除去する除去工程と、この除去工程により形成されたコンクリート構造物の凹部に前記ポリマーセメントモルタルを充填する充填工程とを具備する工法を提案する。 The present invention proposes a construction method comprising a removing step of removing a deteriorated portion of a concrete structure and a filling step of filling the concave portion of the concrete structure formed by the removing step with the polymer cement mortar.
本発明によれば、重量の増加を抑制したいコンクリート部材の劣化部分において適用可能で好適なモルタルが得られる。すなわち、ポリマーセメントモルタルの流動性が良く、凹部内への充填性は良く（このことは、補修や補強に際しての作業性が良いことを意味する。）、かつ、充填された場合の表面平坦性に優れ、硬化体の機械的強度（圧縮強度、曲げ強度、付着強度）に優れ、しかも収縮度は大きくなく、更には塩化物浸透深さや中性化深さが小さい（このことは、補修や補強後における硬化体の劣下が小さいことを意味する。）。 ADVANTAGE OF THE INVENTION According to this invention, the suitable mortar which can be applied in the deterioration part of the concrete member which wants to suppress an increase in a weight is obtained. That is, the fluidity of the polymer cement mortar is good, the filling property into the recesses is good (this means that the workability during repair and reinforcement is good), and the surface flatness when filled Excellent in mechanical strength (compressive strength, bending strength, adhesion strength) of the cured product, and the degree of shrinkage is not large, and further the chloride penetration depth and neutralization depth are small (this means that repair and It means that the deterioration of the cured body after reinforcement is small.)
本発明の実施形態が説明される。
第１の本発明はポリマーセメントモルタルである。特に、急硬性ポリマーセメントモルタルである。前記ポリマーセメントモルタルはセメントを有する。前記セメントは、好ましくは、急硬性のセメントである。前記ポリマーセメントモルタルはセメント用ポリマーを有する。前記ポリマーセメントモルタルは骨材を有する。前記ポリマーセメントモルタルは水を有する。前記骨材には、軽量骨材に分類される骨材と、細骨材に分類される骨材とが含まれる。すなわち、前記ポリマーセメントモルタルには軽量骨材が必須成分として含まれる。しかし、骨材は軽量骨材のみで構成されるものでは無い。軽量骨材に分類されない細骨材が必須成分として含まれる。前記ポリマーセメントモルタルにおいて、水（質量）／セメント（質量）が１８〜４５％、ポリマー（質量）／セメント（質量）が１０〜２８％、細骨材（容積）／セメント（質量）が０．３〜１．２、軽量骨材（容積）／全骨材（容積）が０．４〜０．９である。前記セメント用ポリマーは、好ましくは、ゴムの群の中から選ばれる一種または二種以上である。例えば、スチレン・ブタジエン共重合体、クロロプレンゴム、アクリルニトリル・ブタジエン共重合体、メチルメタクリレート・ブタジエン共重合体の群の中から選ばれる何れかである。天然ゴムでも良い。或いは、ポリオレフィン、ポリクロロピレン、ポリアクリル酸エステル、スチレン・アクリル共重合体、オールアクリル共重合体、酢酸ビニル系樹脂、不飽和ポリエステル樹脂、ポリウレタン樹脂、アルキド樹脂、エポキシ樹脂、瀝青質の群の中から選ばれる一種または二種以上であっても良い。前記軽量骨材は、好ましくは、無機発泡系骨材である。
Embodiments of the invention are described.
The first invention is a polymer cement mortar. In particular, it is a rapid hardening polymer cement mortar. The polymer cement mortar has cement. The cement is preferably a quick-hardening cement. The polymer cement mortar has a cement polymer. The polymer cement mortar has an aggregate. The polymer cement mortar has water. The aggregate includes an aggregate classified as a lightweight aggregate and an aggregate classified as a fine aggregate. That is, the polymer cement mortar contains a lightweight aggregate as an essential component. However, the aggregate is not composed of only the lightweight aggregate. Fine aggregates not classified as lightweight aggregates are included as essential components. In the polymer cement mortar, water (mass) / cement (mass) is 18 to 45%, polymer (mass) / cement (mass) is 10 to 28%, and fine aggregate (volume) / cement (mass) is 0.00. 3-1.2, lightweight aggregate (volume) / total aggregate (volume) is 0.4-0.9. The cement polymer is preferably one or more selected from the group of rubbers. For example, any one selected from the group of styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer, and methyl methacrylate / butadiene copolymer. Natural rubber may be used. Or polyolefin, polychloropyrene, polyacrylic ester, styrene / acrylic copolymer, all acrylic copolymer, vinyl acetate resin, unsaturated polyester resin, polyurethane resin, alkyd resin, epoxy resin, bituminous 1 type or 2 types or more chosen from may be sufficient. The lightweight aggregate is preferably an inorganic foam-based aggregate.
第２の本発明は工法である。前記工法は、前記ポリマーセメントモルタルを用いて補修または補強する工法である。前記工法は、コンクリート構造物の劣化部（劣下部）を除去する除去工程を具備する。前記工法は、前記除去工程で形成されたコンクリート構造物の凹部に前記ポリマーセメントモルタルを充填する充填工程を具備する。 The second present invention is a construction method. The construction method is a method of repairing or reinforcing using the polymer cement mortar. The construction method includes a removing step of removing a deteriorated portion (inferior portion) of the concrete structure. The construction method includes a filling step of filling the polymer cement mortar into the concave portion of the concrete structure formed in the removing step.
以下、更に詳細な説明がなされる。
本発明で用いられるセメントは如何なるセメントでも良い。例えば、水硬性セメントである。具体的には、例えばポルトランドセメント（普通、早強、超早強、低熱及び中庸熱の各種ポルトランドセメント）が挙げられる。エコセメント等も挙げられる。更には、前記セメントに、例えばシリカフュームやフライアッシュ等のポゾラン粉末、高炉スラグ、石灰石微粉末などが混合された各種混合セメントも挙げられる。アルミナセメントも挙げられる。好ましくは、更に、急硬性混和材（剤）が添加された急硬性のセメントである。「ジェットセメント」や「スーパージェットセメント」等の商品名で市販されている超速硬セメント等も使用できる。
A more detailed description will be given below.
The cement used in the present invention may be any cement. For example, hydraulic cement. Specifically, for example, Portland cement (various Portland cements that are normal, early strength, very early strength, low heat, and moderate heat) can be used. Examples include eco-cement. Furthermore, various mixed cements in which pozzolanic powder such as silica fume and fly ash, blast furnace slag, fine limestone powder, and the like are mixed with the cement are also exemplified. Alumina cement is also included. Preferably, it is a rapid hardening cement to which a quick hardening admixture (agent) is further added. Super hard cement etc. marketed under trade names such as “Jet Cement” and “Super Jet Cement” can also be used.
急硬性混和材（剤）は、好ましくは、カルシウムアルミネート類を主成分とする材（剤）である。カルシウムアルミネート類としては、カルシウムアルミネート、カルシウムハロアルミネート、カルシウムナトリウムアルミネート、カルシウムサルホアルミネート、並びにこれらにＳｉＯ２、Ｋ２Ｏ、Ｆｅ２Ｏ３、ＴｉＯ２等が固溶又は化合したものの群から選ばれる一種又は二種以上を用いることが出来る。これらのカルシウムアルミネート類は、化合物、固溶体、ガラス質、又はこれらの二種以上が共存するものであっても良い。急硬性混和材（剤）には、カルシウムアルミネート類以外に、硫酸塩、炭酸塩、アルミン酸塩が適宜配合されても良い。急硬性混和材（剤）は二種以上の急硬性混和材（剤）が併用されても良い。 The rapid-hardening admixture (agent) is preferably a material (agent) whose main component is calcium aluminate. As calcium aluminates, calcium aluminate, calcium haloaluminate, calcium sodium aluminate, calcium sulfoaluminate, and SiO 2 , K 2 O, Fe 2 O 3 , TiO 2, etc. were dissolved or combined. One kind or two or more kinds selected from a group of things can be used. These calcium aluminates may be compounds, solid solutions, vitreous, or those in which two or more of these coexist. In addition to calcium aluminates, sulfates, carbonates, and aluminates may be appropriately blended in the quick-setting admixture (agent). Two or more types of quick-setting admixtures (agents) may be used in combination.
本発明で用いられるセメント用ポリマーとしては、ポリマーセメントモルタルやポリマーセメントコンクリートに使用できるものならば、如何なるポリマーでも良い。ゴムは好ましい例である。例えば、スチレン・ブタジエン共重合体、クロロプレンゴム、アクリルニトリル・ブタジエン共重合体又はメチルメタクリレート・ブタジエン共重合体等の合成ゴムは好ましい。天然ゴムも好ましい。その他には、例えばポリエチレンやポリプロピレン等のポリオレフィンも好ましい。例えば、ポリクロロピレン、ポリアクリル酸エステル、スチレン・アクリル共重合体、オールアクリル共重合体も好ましい。例えば、ポリ酢酸ビニル、酢酸ビニル・アクリル共重合体、酢酸ビニル・アクリル酸エステル共重合体、変性酢酸ビニル、エチレン・酢酸ビニル共重合体、エチレン・酢酸ビニル・塩化ビニル共重合体、酢酸ビニルビニルバーサテート共重合体、アクリル・酢酸ビニル・べオバ（ｔ‐デカン酸ビニルの商品名）共重合体などの酢酸ビニル系樹脂も好ましい。その他にも、不飽和ポリエステル樹脂、ポリウレタン樹脂、アルキド樹脂及びエポキシ樹脂等の合成樹脂も好ましい。又、アスファルト、ゴムアスファルト及びパラフィン等の瀝青質等も好ましい。これらの中から、適宜、一種又は二種以上が用いられる。コンクリート床版との接着性が良いことから、スチレン・ブタジエン共重合体、クロロプレンゴム、アクリルニトリル・ブタジエン共重合体、メチルメタクリレート・ブタジエン共重合体等の合成ゴムは、特に、好ましい。前記セメント用ポリマーは、液体、エマルジョン、又はエマルジョンを粉末状にした再乳化型粉末樹脂と言った如何なる形態のものでも良い。 The polymer for cement used in the present invention may be any polymer as long as it can be used for polymer cement mortar and polymer cement concrete. Rubber is a preferred example. For example, a synthetic rubber such as styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer, or methyl methacrylate / butadiene copolymer is preferable. Natural rubber is also preferred. In addition, polyolefins such as polyethylene and polypropylene are also preferable. For example, polychloropyrene, polyacrylic acid ester, styrene / acrylic copolymer, and all acrylic copolymer are also preferable. For example, polyvinyl acetate, vinyl acetate / acrylic copolymer, vinyl acetate / acrylic ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate A vinyl acetate resin such as a versatate copolymer and an acrylic / vinyl acetate / veova (trade name of vinyl t-decanoate) copolymer is also preferred. In addition, synthetic resins such as unsaturated polyester resins, polyurethane resins, alkyd resins, and epoxy resins are also preferable. Further, bitumen such as asphalt, rubber asphalt and paraffin is preferable. Among these, one kind or two or more kinds are appropriately used. Synthetic rubbers such as styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer, and methyl methacrylate / butadiene copolymer are particularly preferred because of their good adhesion to concrete slabs. The cement polymer may be in any form such as a liquid, an emulsion, or a re-emulsifying powder resin in which the emulsion is powdered.
本発明では骨材が用いられる。骨材としては、軽量骨材に分類される骨材と、細骨材に分類される骨材とが、共に、用いられる。軽量細骨材のみで済まされるものでは無い。例えば、軽量細骨材と、軽量骨材に分類されない細骨材とが、共に、用いられる。前記軽量骨材は、特に、限定されるものではない。しかし、例えば、黒曜石を焼成発泡させた無機系発泡性骨材であるパーライト、火力発電所で発生するフライアッシュバルーン、発泡ガラス粒（ガラスバルーン）等が、好ましい軽量骨材（軽量細骨材）として挙げられる。一種類であっても、二種類以上であっても良い。軽量骨材は、例えば嵩比重が０．１〜０．８のものが好ましい。嵩比重が０．８を越えた骨材では、軽量化の効果が奏され難い。逆に、０．１未満の場合は、骨材強度が弱くなり、好ましくない。より好ましくは、０．１５以上である。より好ましくは、０．６以下である。軽量骨材に分類されない細骨材しては、例えば川砂、山砂、陸砂、海砂、砕砂、珪砂などが挙げられる。粒度調整された細骨材が好ましい。軽量骨材に分類されない細骨材は、嵩比重が、例えば２．０以上である。 In the present invention, aggregate is used. As the aggregate, an aggregate classified as a lightweight aggregate and an aggregate classified as a fine aggregate are both used. It is not just a lightweight fine aggregate. For example, both a lightweight fine aggregate and a fine aggregate that is not classified as a lightweight aggregate are used. The lightweight aggregate is not particularly limited. However, for example, pearlite, which is an inorganic foamed aggregate obtained by firing and foaming obsidian, fly ash balloon generated in a thermal power plant, foamed glass particles (glass balloon), etc. are preferred lightweight aggregates (lightweight fine aggregates). As mentioned. One type or two or more types may be used. The lightweight aggregate preferably has a bulk specific gravity of 0.1 to 0.8, for example. Aggregates with a bulk specific gravity exceeding 0.8 are less likely to be lightened. On the other hand, when it is less than 0.1, the aggregate strength becomes weak, which is not preferable. More preferably, it is 0.15 or more. More preferably, it is 0.6 or less. Examples of fine aggregates not classified as lightweight aggregates include river sand, mountain sand, land sand, sea sand, crushed sand, and quartz sand. Fine aggregates with adjusted particle size are preferred. A fine aggregate not classified as a lightweight aggregate has a bulk specific gravity of, for example, 2.0 or more.
本発明では、水／セメント（Ｗ／Ｃ：水セメント比）は１８〜４５質量％が必須要件であった。すなわち、本発明のポリマーセメントモルタルは、Ｗ／Ｃが上記値となる水を含有する。水性の液状混和材料（例えば、混和剤水溶液やエマルジョン状のセメント用ポリマー）が添加される場合、前記水量には、ポリマーセメントモルタルに添加された前記水性材料に含まれる水量も入る。前記Ｗ／Ｃが１８質量％未満の場合、ポリマーセメントモルタルの流動性が低い。この為、ポリマーセメントモルタルの充填性が悪く、かつ、ポリマーセメントモルタルの付着強度も低下した。前記Ｗ／Ｃが４５質量％を越えた場合、ポリマーセメントモルタルの組成物の分離が起こり易かった。かつ、中性化や塩分浸透性に対する抵抗性が大きく低下した。このようなことから、Ｗ／Ｃが１８〜４５質量％は、非常に、大事な必須要件であった。好ましくは、２３質量％以上であった。好ましくは、３５質量％以下であった。尚、セメントが、例えば急硬性セメントである場合、前記セメント量は急硬性混和材（剤）を含んだ量である。 In the present invention, the water / cement (W / C: water cement ratio) is 18 to 45% by mass. That is, the polymer cement mortar of the present invention contains water having W / C of the above value. When an aqueous liquid admixture (for example, an admixture aqueous solution or an emulsion cement polymer) is added, the amount of water includes the amount of water contained in the aqueous material added to the polymer cement mortar. When the W / C is less than 18% by mass, the fluidity of the polymer cement mortar is low. For this reason, the filling property of the polymer cement mortar was poor, and the adhesion strength of the polymer cement mortar was also lowered. When the W / C exceeded 45% by mass, the composition of the polymer cement mortar easily separated. In addition, the resistance to neutralization and salt permeability was greatly reduced. For this reason, 18 to 45% by mass of W / C is a very important requirement. Preferably, it was 23 mass% or more. Preferably, it was 35 mass% or less. In addition, when a cement is a quick-hardening cement, for example, the said cement amount is the quantity containing a quick-hardening admixture (agent).
本発明では、ポリマー／セメント（ポリマーセメント比）は１０〜２８質量％が必須要件であった。前記セメント用ポリマーは、ポリマーセメント比（固形分［１０５℃における不揮発性分］換算の質量比）が１０〜２８質量％となるように配合される。ポリマーセメント比が１０％未満の場合、付着強度や曲げ強度が不足した。更に、中性化や塩分浸透性に対する抵抗性も低下した。ポリマーセメント比が２８質量％を越えた場合、ポリマーセメントモルタルの粘性が高くなり過ぎ、ポリマーセメントモルタルの充填作業性が大きく低下した。更に、硬化後の圧縮強度が低下した。このようなことから、ポリマーセメント比は１０〜２８質量％であることが必要であった。好ましくは、１２質量％以上であった。好ましくは、２５質量％以下であった。単位ポリマー量は、固形分換算で、５０〜１５０ｋｇ／ｍ３であった。 In the present invention, 10 to 28% by mass of the polymer / cement (polymer cement ratio) is an essential requirement. The polymer for cement is blended so that the polymer cement ratio (mass ratio in terms of solid content [nonvolatile content at 105 ° C.]) is 10 to 28% by mass. When the polymer cement ratio was less than 10%, adhesion strength and bending strength were insufficient. In addition, the resistance to neutralization and salt permeability decreased. When the polymer cement ratio exceeded 28% by mass, the viscosity of the polymer cement mortar became too high, and the filling workability of the polymer cement mortar was greatly reduced. Furthermore, the compressive strength after curing decreased. Therefore, the polymer cement ratio needs to be 10 to 28% by mass. Preferably, it was 12 mass% or more. Preferably, it was 25 mass% or less. The unit polymer amount was 50 to 150 kg / m 3 in terms of solid content.
本発明では、細骨材／セメント（細骨材の容積／セメントの質量：細骨材容積セメント質量比）は０．３〜１．２が必須要件であった。細骨材容積セメント質量比が０．３未満の場合、セメントペーストに富んだ配合となる為、自己収縮が大きかった。かつ、十分な軽量化が達成できなかった。１．２を越えた場合、ポリマーセメントモルタルの充填性が悪く、付着強度も悪かった。このようなことから、細骨材容積セメント質量比が０．３〜１．２であることが必要であった。好ましくは、０．４５以上であった。好ましくは、０．９０以下であった。 In the present invention, a fine aggregate / cement (volume of fine aggregate / mass of cement: fine aggregate volume cement mass ratio) is an essential requirement of 0.3 to 1.2. When the fine aggregate volume cement mass ratio was less than 0.3, the composition was rich in cement paste, and thus the self-shrinkage was large. In addition, sufficient weight reduction could not be achieved. When exceeding 1.2, the filling property of the polymer cement mortar was poor, and the adhesion strength was also poor. For this reason, the fine aggregate volume cement mass ratio was required to be 0.3 to 1.2. Preferably, it was 0.45 or more. Preferably, it was 0.90 or less.
本発明では、軽量骨材／全骨材（軽量骨材の容積／全骨材の容積：軽量骨材容積比）は０．４〜０．９が必須要件であった。前記軽量骨材容積比が０．４未満の場合、軽量化が達成できない。０．９を越えた場合、圧縮強度や曲げ強度が低下した。更に、乾燥収縮も大きくなった。かつ、中性化や塩分浸透性に対する抵抗性も低下した。このようなことから、前記軽量骨材容積比が０．４〜０．９であることが必要であった。好ましくは、０．６以上であった。好ましくは、０．８以下であった。 In the present invention, the light aggregate / total aggregate (volume of lightweight aggregate / volume of total aggregate: light aggregate volume ratio) is indispensable as 0.4 to 0.9. If the lightweight aggregate volume ratio is less than 0.4, weight reduction cannot be achieved. When it exceeded 0.9, compressive strength and bending strength were lowered. Furthermore, drying shrinkage also increased. In addition, the resistance to neutralization and salt permeability decreased. For this reason, the lightweight aggregate volume ratio needs to be 0.4 to 0.9. Preferably, it was 0.6 or more. Preferably, it was 0.8 or less.
本発明のポリマーセメントモルタルには、本発明の効果を実質上喪失させない限り、前記以外の成分を含むものであっても良い。例えば、減水剤（高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤、流動化剤、分散剤と称されるものを含む。）、収縮低減剤、消泡剤、繊維、凝結調整剤、ポゾラン反応性物質、撥水剤、白華防止剤、抗菌剤、浄化剤、増粘剤、顔料等が挙げられる。勿論、これらに限定されるものではない。繊維としては、例えばガラス繊維、金属繊維、又は有機繊維などが挙げられる。繊維が併用されると、ポリマーセメントモルタルの飛散が防止されるので、好ましい。 The polymer cement mortar of the present invention may contain components other than those described above as long as the effects of the present invention are not substantially lost. For example, water-reducing agents (including those called high-performance water-reducing agents, AE water-reducing agents, high-performance AE water-reducing agents, fluidizing agents, and dispersing agents), shrinkage reducing agents, antifoaming agents, fibers, setting modifiers, Examples include pozzolanic reactive substances, water repellents, anti-whitening agents, antibacterial agents, cleaning agents, thickeners, pigments and the like. Of course, it is not limited to these. Examples of the fiber include glass fiber, metal fiber, and organic fiber. When fibers are used in combination, it is preferable because scattering of the polymer cement mortar is prevented.
ポリマーセメントモルタルの作製方法は、特には、限定されない。例えば、一般的なセメント系のモルタルと概ね同様な方法で作製できる。具体的な一例を示すと、市販のモルタルミキサに前記材料をペール缶などの容器に一括投入し、水を加えて混合する。多量に作製する場合は、パン型コンクリートミキサ、パグミル型コンクリートミキサ、重力式コンクリートミキサ等が使用される。 The method for producing the polymer cement mortar is not particularly limited. For example, it can be produced by a method generally similar to general cement-based mortar. As a specific example, the materials are put into a container such as a pail can in a commercial mortar mixer, and water is added and mixed. When producing in large quantities, a pan-type concrete mixer, a pug mill-type concrete mixer, a gravity concrete mixer, etc. are used.
前記ポリマーセメントモルタルは、各種コンクリート構造物のひび割れ、剥離、或いは欠損箇所の補修・補強に用いられる。特に、コンクリート床版の劣化箇所の補修に好適である。 The polymer cement mortar is used for cracking, peeling, or repairing / reinforcing a cracked portion of various concrete structures. In particular, it is suitable for repairing a deteriorated portion of a concrete slab.
以下、更に具体的な説明が行われる。但し、本発明は以下の説明に限定されるものではない。本発明の特長が大きく損なわれない限り、各種の変形例・応用例も含まれる。 Hereinafter, more specific description will be given. However, the present invention is not limited to the following description. Various modifications and application examples are included as long as the features of the present invention are not greatly impaired.
［実施例］
［使用材料］
セメント：普通ポルトランドセメント（太平洋セメント株式会社製、比重；３．１６）
急硬性混和剤：カルシウムアルミネートを有効成分とする急硬剤
セメント用ポリマー：スチレンブタジエンゴム（太平洋マテリアル株式会社製、不揮発性分量；４５質量％）
細骨材：珪砂（比重；２．６３、Ｆ．Ｍ．；２．８９）
軽量骨材（軽量細骨材）：発泡軽量骨材（太平洋パーライト株式会社製、嵩比重；０．２１）
水：水道水
［ポリマーセメントモルタルの作製］
急硬性混和剤をセメントと混合し、急硬性セメントとして調製した後、表１に示される配合割合のポリマーセメントモルタルを５Ｌ作製した。
[Materials used]
Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd., specific gravity: 3.16)
Quick hardening admixture: Quick hardening agent containing calcium aluminate as an active ingredient Cement polymer: Styrene butadiene rubber (manufactured by Taiheiyo Materials Co., Ltd., nonvolatile content: 45% by mass)
Fine aggregate: quartz sand (specific gravity; 2.63, FM; 2.89)
Lightweight aggregate (lightweight fine aggregate): Foamed lightweight aggregate (Pacific Perlite Co., Ltd., bulk specific gravity; 0.21)
Water: Tap water [Production of polymer cement mortar]
A quick-setting admixture was mixed with cement to prepare a quick-setting cement, and 5 L of a polymer cement mortar having a blending ratio shown in Table 1 was prepared.
作製は、各材料を金属製円筒容器（容量：１８Ｌ）に全量投入した後、９０秒間ハンドミキサ（回転数：３００ｒ．ｐ．ｍ）で混合した。供試体作製、及び練り混ぜは、全て２０℃で行い、使用材料の温度も２０℃とした上で評価試験を行った。 For production, all the materials were put into a metal cylindrical container (capacity: 18 L), and then mixed for 90 seconds with a hand mixer (rotation speed: 300 rpm). The specimen preparation and kneading were all performed at 20 ° C., and the evaluation test was performed after the temperature of the material used was also set to 20 ° C.
［評価試験］
（１） フロー試験
ＪＩＳＲ５２０１「セメントの物理試験方法」に準拠し、１５打の振動を与える前のフロー値と振動を与えた後のフロー値を測定した。
（２） 単位容積重量試験
練り上がり直後の試料を容積４００ｍｌの円筒容器に詰め、その重量を測定し、試料重量／容器容積により算出した。
（３） 充填性評価試験
１０ｃｍ×１０ｃｍ×４ｃｍ（たて、よこ、高さ）の型枠にモルタルを流し込み、硬化した後に充填状況を目視にて確認した。
（４） 平坦性評価試験
１０ｃｍ×１０ｃｍ×４ｃｍ（たて、よこ、高さ）の型枠にモルタルを流し込み、コテで均した。勾配が０％の場合と、４％の場合の平坦性を評価した。
（５） 圧縮強度試験
ＪＩＳＡ１１０８「コンクリートの圧縮強度試験方法」に準拠し、材齢２８日時点での試験を実施した。
（６） 曲げ強度試験
ＪＩＳＡ１１１６「コンクリートの曲げ強度試験方法」に準拠し、材齢２８日時点での試験を実施した。
（７） 付着強度試験
ＪＩＳＡ１１７１「ポリマーセメントモルタルの試験方法」に準拠し、材齢２８日時点での試験を実施した。
（８） 自己収縮試験
１０ｃｍ×１０ｃｍ×４０ｃｍの供試体中央部に埋め込み型ひずみ計を設置して供試体を作製し、アルミテープで全面をシールし、乾燥を防いだ状態とし、材齢２８日のひずみ量（自己収縮量）を測定した。
（９） 乾燥収縮試験
４ｃｍ×４ｃｍ×１６ｃｍの型枠にモルタルを充填して供試体を作製した。２日で脱型し、５日水中養生した後、材齢２８日における乾燥収縮量を、ＪＩＳＡ１１２９「モルタル及びコンクリートの長さ変化試験方法」に準拠し、測定した。
（10） 塩化物イオン浸透深さ試験
材齢２８日まで養生した供試体の一側面を残してエポキシで覆い塩水に浸漬し、更に２８日経過後、側面からの塩化物イオンの浸透深さをＪＩＳＡ１１７１「ポリマーセメントモルタルの試験方法」及びＪＩＳＡ６２０５「鉄筋コンクリート用防せい剤」に準拠して測定した。
（11） 中性化深さ試験
材齢２８日まで養生した供試体の一側面を残してアルミテープでシールして中性化槽に入れ、更に２８日経過後、側面からの中性化深さをＪＩＳＡ１１５３「コンクリートの促進中性化試験方法」に準拠して測定した。
評価試験の結果が表２に示される。
(1) Flow test In accordance with JIS R5201 “Cement physical test method”, the flow value before applying vibration of 15 strokes and the flow value after applying vibration were measured.
(2) Unit volume weight test The sample immediately after kneading was packed in a cylindrical container having a capacity of 400 ml, the weight was measured, and the weight was calculated from the sample weight / container volume.
(3) Fillability evaluation test Mortar was poured into a 10 cm × 10 cm × 4 cm (vertical, horizontal, height) mold and cured, and the filling state was visually confirmed.
(4) Flatness evaluation test Mortar was poured into a 10 cm × 10 cm × 4 cm (vertical, horizontal, height) mold and leveled with a trowel. The flatness was evaluated when the gradient was 0% and 4%.
(5) Compressive strength test Based on JISA1108 "Concrete compressive strength test method", the test at the age of 28 days was implemented.
(6) Bending strength test Based on JISA1116 "bending strength test method of concrete", the test at the age of 28 days was implemented.
(7) Adhesive strength test The test at the time of material age 28 days was implemented based on JISA1171 "Test method of polymer cement mortar".
(8) Self-shrinkage test A specimen was prepared by installing an embedded strain gauge at the center of a 10 cm × 10 cm × 40 cm specimen, and the entire surface was sealed with aluminum tape to prevent drying. The amount of strain (self-shrinkage) was measured.
(9) Drying Shrinkage Test A specimen was prepared by filling a 4 cm × 4 cm × 16 cm mold with mortar. After demolding in 2 days and curing in water for 5 days, the amount of drying shrinkage at the age of 28 days was measured in accordance with JIS A1129 “Testing method for length change of mortar and concrete”.
(10) Chloride ion penetration depth test Leave one side of the specimen cured until the age of 28 days, cover with epoxy and soak in salt water, and after 28 days, determine the penetration depth of chloride ion from the side. It was measured according to “Testing method for polymer cement mortar” and JIS A6205 “Anti-corrosive agent for reinforced concrete”.
(11) Neutralization Depth Test Leave one side of the specimen cured until the age of 28 days, seal it with aluminum tape and put it in the neutralization tank. After another 28 days, the neutralization depth from the side Was measured according to JIS A 1153 “Promoted Neutralization Test Method for Concrete”.
The results of the evaluation test are shown in Table 2.
表１，２から、水（質量）／セメント（質量）が１８〜４５％、ポリマー（質量）／セメント（質量）が１０〜２８、細骨材（容積）／セメント（質量）が０．３〜１．２、軽量骨材（容積）／細骨材（容積）が０．４〜０．９のポリマーセメントモルタルは、流動性が良く、凹部内への充填性が良く、かつ、充填された場合の表面平坦性に優れ、硬化体の機械的強度（圧縮強度、曲げ強度、付着強度）に優れ、かつ、収縮度合は適度であり、しかも塩化物浸透深さは小さく、更には中性化深さも小さい。 From Tables 1 and 2, water (mass) / cement (mass) is 18 to 45%, polymer (mass) / cement (mass) is 10 to 28, and fine aggregate (volume) / cement (mass) is 0.3. -1.2, polymer aggregate mortar with light aggregate (volume) / fine aggregate (volume) of 0.4-0.9 has good fluidity, good filling into recesses and is filled Excellent surface flatness, excellent mechanical strength (compressive strength, bending strength, adhesion strength) of the cured product, moderate shrinkage, small chloride penetration depth, and neutrality The chemical depth is also small.
これに対して、水セメント比が本発明外の１５％（配合Ｎｏ．９）の場合、モルタルの流動性が悪く、かつ、充填性や平坦性に劣り、又、機械的強度（圧縮強度、曲げ強度、付着強度）が劣り、更には塩化物浸透深さや中性化深さが大きい。 On the other hand, when the water cement ratio is 15% outside the present invention (formulation No. 9), the flowability of the mortar is poor, the filling property and the flatness are inferior, and the mechanical strength (compressive strength, Bending strength and adhesion strength are inferior, and chloride penetration depth and neutralization depth are large.
水セメント比が本発明外の５０％（配合Ｎｏ．１０）の場合、充填モルタルの平坦性に劣り、かつ、機械的強度（圧縮強度、曲げ強度、付着強度）が劣り、又、乾燥収縮の度合いが大きく、更には塩化物浸透深さや中性化深さが大きい。 When the water-cement ratio is 50% outside the present invention (formulation No. 10), the flatness of the filled mortar is inferior, the mechanical strength (compressive strength, bending strength, adhesion strength) is inferior, and drying shrinkage The degree is large, and further the chloride penetration depth and neutralization depth are large.
ポリマーセメント比が本発明外の５％（配合Ｎｏ．１１）の場合、充填モルタルの平坦性に劣り、かつ、機械的強度（曲げ強度、付着強度）が劣り、更には塩化物浸透深さや中性化深さが大きい。 When the polymer cement ratio is 5% outside of the present invention (formulation No. 11), the flatness of the filled mortar is inferior, the mechanical strength (bending strength, adhesion strength) is inferior, and further, the chloride penetration depth and medium The sexual depth is large.
ポリマーセメント比が本発明外の３０％（配合Ｎｏ．１２）の場合、充填モルタルの平坦性に劣り、かつ、機械的強度（圧縮強度）が劣る。 When the polymer cement ratio is 30% outside the present invention (formulation No. 12), the flatness of the filled mortar is inferior and the mechanical strength (compressive strength) is inferior.
軽量骨材容積比が本発明外の０．２２（配合Ｎｏ．１５，１７）の場合、軽量性に劣る。 When the light-weight aggregate volume ratio is 0.22 (mixing Nos. 15 and 17) outside the present invention, the light weight is inferior.
軽量骨材容積比が本発明外の０．９４（配合Ｎｏ．１６）の場合、機械的強度（圧縮強度、曲げ強度、付着強度）が劣り、かつ、収縮度合が大きく、更には塩化物浸透深さや中性化深さが大きい。 When the light-weight aggregate volume ratio is 0.94 (formulation No. 16) outside the present invention, the mechanical strength (compression strength, bending strength, adhesion strength) is inferior, the degree of shrinkage is large, and further chloride penetration Depth and neutralization depth are large.
細骨材容積セメント質量比が本発明外の０．０６（配合Ｎｏ．２０）の場合、充填モルタルの平坦性に劣り、かつ、収縮度合が大きい。 When the fine aggregate volume cement mass ratio is 0.06 (mixing No. 20) outside the present invention, the flatness of the filled mortar is inferior and the degree of shrinkage is large.
細骨材容積セメント質量比が本発明外の１．２６（配合Ｎｏ．２１）の場合、モルタルの流動性が悪く、かつ、充填性や平坦性に劣り、又、機械的強度（圧縮強度、曲げ強度、付着強度）が劣る。 When the fine aggregate volume cement mass ratio is 1.26 outside of the present invention (formulation No. 21), the flowability of the mortar is poor, the filling property and the flatness are inferior, and the mechanical strength (compressive strength, Bending strength and adhesion strength are inferior.
何れにしても、本発明の必須構成要件が一つ欠けたのみでも、本発明が奏する特長を、到底に、奏することが出来ない。
In any case, even if only one essential constituent requirement of the present invention is lacking, the features exhibited by the present invention cannot be achieved.
Claims (6)
前記骨材には、軽量骨材に分類される骨材と、細骨材に分類される骨材とが含まれてなり、
水（質量）／セメント（質量）が１８〜４５％、ポリマー（質量）／セメント（質量）が１０〜２８％、細骨材（容積）／セメント（質量）が０．３〜１．２、軽量骨材（容積）／全骨材（容積）が０．４〜０．９である
ポリマーセメントモルタル。 A polymer cement mortar containing cement, a cement polymer, an aggregate, and water,
The aggregate includes an aggregate classified as a lightweight aggregate and an aggregate classified as a fine aggregate,
Water (mass) / cement (mass) is 18 to 45%, polymer (mass) / cement (mass) is 10 to 28%, fine aggregate (volume) / cement (mass) is 0.3 to 1.2, A polymer cement mortar having a lightweight aggregate (volume) / total aggregate (volume) of 0.4 to 0.9.
請求項１のポリマーセメントモルタル。 The polymer cement mortar of claim 1, wherein the cement is a quick setting cement and the polymer cement mortar is a quick setting polymer cement mortar.
請求項２のポリマーセメントモルタル。 The polymer cement mortar according to claim 2, wherein the cement polymer is one or more selected from the group of rubbers.
請求項１〜請求項３いずれかのポリマーセメントモルタル。 The cement polymer is a synthetic rubber selected from the group of styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer, methyl methacrylate / butadiene copolymer, natural rubber, polyolefin, polychloropyrene, poly One or more selected from the group consisting of acrylic ester, styrene / acrylic copolymer, all acrylic copolymer, vinyl acetate resin, unsaturated polyester resin, polyurethane resin, alkyd resin, epoxy resin, and bituminous The polymer cement mortar according to any one of claims 1 to 3.
請求項１〜請求項４いずれかのポリマーセメントモルタル。 The polymer cement mortar according to any one of claims 1 to 4, wherein the lightweight aggregate is an inorganic foam-based aggregate.
A method of repairing or reinforcing using the polymer cement mortar according to claim 1.
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| KR101939345B1 (en) * | 2018-03-06 | 2019-01-16 | 연후산업 주식회사 | Extra Rapid-Hardening Modified Cement Concrete Composition Having Abrasion Resistance And Crack Resistance And Method For Repairing And Reinforcing Road Pavement Using The Same |
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| KR101939345B1 (en) * | 2018-03-06 | 2019-01-16 | 연후산업 주식회사 | Extra Rapid-Hardening Modified Cement Concrete Composition Having Abrasion Resistance And Crack Resistance And Method For Repairing And Reinforcing Road Pavement Using The Same |
| KR101933677B1 (en) | 2018-03-29 | 2018-12-28 | 주식회사 이콘스 | Concrete repair materials for improved durability of concrete structure, and method for repairing concrete structure using this same |
| CN113710626A (en) * | 2019-05-06 | 2021-11-26 | Sika技术股份公司 | Mortar composition for acoustic damping and fire protection |
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