JP7350425B2 - Highly durable grout composition - Google Patents
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- JP7350425B2 JP7350425B2 JP2019061963A JP2019061963A JP7350425B2 JP 7350425 B2 JP7350425 B2 JP 7350425B2 JP 2019061963 A JP2019061963 A JP 2019061963A JP 2019061963 A JP2019061963 A JP 2019061963A JP 7350425 B2 JP7350425 B2 JP 7350425B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Description
本発明は、高耐久性グラウト組成物に関する。詳しくは、混練したグラウト材が、作業性、ポンプ圧送性、充填性、付着性、強度発現性、乾燥収縮性に優れ、且つ中性化抵抗性及び遮塩性に優れる高耐久性グラウト組成物に関する。より詳しくは、混練したグラウト材が、ＪＩＳ Ａ １１７１「ポリマーセメントモルタルの試験方法」６．２「フロー試験」に準拠して測定したフロー値が２１０～２７０mm、脈動やポンプ詰まりを起こさずにポンプ圧送でき、鉄筋が存在する状態で充填を行っても有害な空隙が生じ難く、下地との付着強度が１．０Ｎ／mm２以上あり、材齢２８日で４０Ｎ／mm２以上の圧縮強度があり、材齢３ヶ月（９１日）で乾燥収縮性が５×１０－４（５００μ）以下であり、且つ材齢３ヶ月（９１日）における中性化深さ及び塩化物イオン浸透深さが、ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」１１．５「モルタルの配合」で示される配合のモルタル（以下、「ＪＩＳモルタル」という。）の測定結果の６０％以下である高耐久性グラウト組成物に関する。 The present invention relates to highly durable grout compositions. Specifically, the kneaded grout material is a highly durable grout composition that has excellent workability, pumping properties, filling properties, adhesion properties, strength development properties, and drying shrinkage properties, as well as excellent neutralization resistance and salt blocking properties. Regarding. More specifically, the kneaded grout material has a flow value of 210 to 270 mm as measured in accordance with JIS A 1171 "Testing Methods for Polymer Cement Mortar" 6.2 "Flow Test", and the pump can be pumped without causing pulsation or pump clogging. It can be pumped, does not create harmful voids even when filled with reinforcing bars, has an adhesive strength of 1.0 N/ mm2 or more with the substrate, and has a compressive strength of 40 N/mm2 or more at 28 days of age. The drying shrinkage is 5×10 -4 (500μ) or less at the age of 3 months (91 days), and the depth of neutralization and the depth of chloride ion penetration at the age of 3 months (91 days) are , a highly durable grout composition that is 60% or less of the measurement results of mortar with the composition specified in JIS R 5201 "Physical Test Methods for Cement" 11.5 "Mortar Mixture" (hereinafter referred to as "JIS mortar") Regarding.
鉄筋コンクリート造の土木構造物や建築構造物の構築又は補修、或いは機械の設置等において、流動性の高いモルタルからなるセメント系グラウト材が用いられている。鉄筋コンクリート造構造物を補修する場合、劣化した部分のコンクリートを除去した後に、露出した鉄筋の防錆処理などを行い、除去したコンクリートの代わりに断面修復用モルタルで修復（断面修復）することが行われている。断面修復用モルタルは、乾燥収縮が小さくひび割れが発生し難いこと、付着性，強度特性，中性化抵抗性，遮塩性及び作業性に優れること、つまり、高耐久性に等が求められる。一方、セメント系グラウト材は、流動性を高くすることから水セメント比が大きく、乾燥収縮を小さくし難い。 BACKGROUND OF THE INVENTION Cement grout made of highly fluid mortar is used in the construction or repair of reinforced concrete civil engineering and architectural structures, the installation of machinery, and the like. When repairing a reinforced concrete structure, after removing the deteriorated concrete, the exposed reinforcing bars should be treated with anti-rust treatment, and then repaired with mortar for cross-section repair (cross-section repair) in place of the removed concrete. It is being said. Mortar for cross-section repair is required to have low drying shrinkage, less cracking, excellent adhesion, strength characteristics, carbonation resistance, salt-blocking properties, and workability, that is, high durability. On the other hand, cement-based grout has a high water-cement ratio due to its high fluidity, making it difficult to reduce drying shrinkage.
セメント系グラウト材のひび割れ抑制技術としては、収縮低減剤や膨張材を使用することが一般的である（例えば特許文献１参照。）。また、石灰石骨材を使用することで、乾燥収縮を小さくすることも提案されている（例えば特許文献２参照。）。 As a technique for suppressing cracks in cement-based grout materials, it is common to use shrinkage reducing agents and expansion materials (see, for example, Patent Document 1). It has also been proposed to reduce drying shrinkage by using limestone aggregate (see, for example, Patent Document 2).
しかし、断面修復用モルタルに使用するには、より乾燥収縮が小さくひび割れが発生し難く、付着性，強度特性，中性化抵抗性及び遮塩性に優れる、つまり、より耐久性に優れることが求められ、そのようなグラウト組成物（高耐久性グラウト組成物）が求められている。 However, to be used as a mortar for cross-section repair, it must have less drying shrinkage, less cracking, and better adhesion, strength characteristics, carbonation resistance, and salt-blocking properties, in other words, it must be more durable. There is a need for such grout compositions (highly durable grout compositions).
本発明は前記問題の解決、即ち、本発明は、乾燥収縮が小さくひび割れが発生し難く、付着性，強度特性，中性化抵抗性及び遮塩性に優れ、断面修復用グラウト材として優れる高耐久性グラウト組成物を提供することを目的とする。より詳しくは、下地との付着強度が１．０Ｎ／mm２以上あり、材齢２８日で４０Ｎ／mm２以上の圧縮強度があり、乾燥収縮率が材齢３ヶ月（材齢９１日）で５×１０－４（５００μ）以下であり、材齢３ヶ月（９１日）における中性化深さ及び塩化物イオン浸透深さがＪＩＳモルタルの測定結果の６０％以下であり、フロー値が２１０～２７０mmで、材齢３ヶ月（９１日）で乾燥収縮性が５×１０－４（５００μ）以下であり、脈動やポンプ詰まりを起こさずにポンプ圧送でき、鉄筋が存在する状態で充填を行っても有害な空隙が生じ難くい、高耐久性グラウト組成物を提供することを目的とする。 The present invention solves the above problems, that is, the present invention is a high quality grout material that has small drying shrinkage, is difficult to crack, has excellent adhesion, strength characteristics, carbonation resistance, and salt shielding properties, and is excellent as a grout material for cross-sectional repair. The purpose is to provide a durable grout composition. More specifically, the adhesion strength with the substrate is 1.0 N/ mm2 or more, the compressive strength is 40 N/mm2 or more at 28 days of age, and the drying shrinkage rate is 3 months (91 days). 5 × 10 -4 (500μ) or less, the neutralization depth and chloride ion penetration depth at 3 months (91 days) are 60% or less of the JIS mortar measurement results, and the flow value is 210 ~270mm, the drying shrinkage is less than 5×10 -4 (500μ) at 3 months (91 days), it can be pumped without pulsation or pump clogging, and it can be filled in the presence of reinforcing bars. It is an object of the present invention to provide a highly durable grout composition that is less likely to produce harmful voids.
特定の粒度の骨材を特定割合含み、更に、セメント、減水剤、増粘剤及び骨材を含み、骨材セメントの質量比率及び粉体と液体の質量比率が特定割合とすることで解決する。ポリマーディスパージョンを粉体質量の特定割合含有すると好適である。また、粉体中にフライアッシュを特定割合含有すると好適である。また、特定の混和材料を含有すると好適である。本発明は、以下の（１）～（３）で表す高耐久性グラウト組成物である。
（１）含有する粉体の合計質量に対し、粒径１．２～３．０mmの骨材を２５～３５質量％、粒径０．６～１．２mmの骨材を１０～１４質量％、粒径０．６mm以下の骨材を２０～３０質量％含有し、更に、セメント、減水剤、増粘剤、尿素及びポリマーディスパージョンを含有し、骨材セメント比が１：２．６～３．４であり、液体の質量が粉体質量の１０～１２質量％であ、且つポリマーディスパージョンの含有割合が１０５℃における不揮発性分換算で粉体質量の０．２～０．８質量％である高耐久性グラウト組成物。
（２）粉体中にフライアッシュを５～１１質量％含有する上記（１）の高耐久性グラウト組成物。
（３）更に、膨張材、石膏、アルカリ金属硫酸塩から選ばれる１種又は２種以上を含有する上記（１）又は（２）の高耐久性グラウト組成物。
This can be solved by containing a specific proportion of aggregate with a specific particle size, and further containing cement, water reducing agent, thickener, and aggregate, and setting the mass ratio of aggregate cement and the mass ratio of powder and liquid to specific proportions. . Preferably, the polymer dispersion is contained in a certain proportion of the powder mass. Further, it is preferable that the powder contains fly ash in a specific proportion. Further, it is preferable to contain a specific admixture material. The present invention is a highly durable grout composition represented by (1) to (3) below.
(1) Based on the total mass of powder contained, 25-35% by mass of aggregate with a particle size of 1.2-3.0 mm and 10-14% by mass of aggregate with a particle size of 0.6-1.2 mm , contains 20 to 30% by mass of aggregate with a particle size of 0.6 mm or less, further contains cement, water reducing agent, thickener, urea and polymer dispersion, and has an aggregate cement ratio of 1:2.6 to 3.4, the mass of the liquid is 10 to 12% by mass of the powder mass , and the content of the polymer dispersion is 0.2 to 0.8 mass of the powder mass in terms of nonvolatile content at 105 ° C. A highly durable grout composition that is %.
(2) The highly durable grout composition of (1) above, containing 5 to 11% by mass of fly ash in the powder .
(3) The highly durable grout composition according to (1) or (2) above, further containing one or more selected from expanding agents, gypsum, and alkali metal sulfates.
本発明によれば、乾燥収縮が小さくひび割れが発生し難く、付着性，強度特性，中性化抵抗性及び遮塩性に優れ、断面修復用グラウト材として優れる高耐久性グラウト組成物が得られる。また、本発明によれば、下地との付着強度が１．０Ｎ／mm２以上あり、材齢２８日で４０Ｎ／mm２以上の圧縮強度があり、乾燥収縮率が材齢３ヶ月（材齢９１日）で５×１０－４（５００μ）以下であり、材齢３ヶ月（９１日）における中性化深さ及び塩化物イオン浸透深さがＪＩＳモルタルの測定結果の６０％以下であり、フロー値が２１０～２７０mmで、材齢３ヶ月（９１日）で乾燥収縮性が５×１０－４（５００μ）以下であり、脈動やポンプ詰まりを起こさずにポンプ圧送でき、鉄筋が存在する状態で充填を行っても有害な空隙が生じ難くい、高耐久性グラウト組成物が得られる。本発明によれば、鉄筋コンクリートの断面修復工事に、乾燥収縮が小さくひび割れが発生し難く、付着性，強度特性，中性化抵抗性及び遮塩性に優れ、断面修復用グラウト材として優れる高耐久性グラウト組成物を、断面修復用グラウト材として使用することができるので、修復した鉄筋コンクリートは高耐久性が得られる。 According to the present invention, it is possible to obtain a highly durable grout composition that exhibits small drying shrinkage, is resistant to cracking, has excellent adhesion, strength characteristics, carbonation resistance, and salt blocking properties, and is excellent as a grout material for cross-sectional repair. . Furthermore, according to the present invention, the adhesion strength with the substrate is 1.0 N/mm 2 or more, the compressive strength is 40 N/mm 2 or more at 28 days of age, and the drying shrinkage rate is 3 months old (material age The carbonation depth and chloride ion penetration depth at 3 months (91 days) are 60% or less of the JIS mortar measurement results, The flow value is 210 to 270 mm, the drying shrinkage is 5 x 10 -4 (500 μ) or less at 3 months (91 days), the pump can be pumped without pulsation or pump clogging, and there are reinforcing bars. It is possible to obtain a highly durable grout composition that is unlikely to produce harmful voids even when filled with. According to the present invention, the highly durable grout material is suitable for cross-section repair work of reinforced concrete because it has low drying shrinkage, is difficult to crack, has excellent adhesion, strength characteristics, carbonation resistance, and salt-blocking properties, and is excellent as a grout material for cross-section repair. Since the adhesive grout composition can be used as a cross-sectional repair grout, the repaired reinforced concrete will have high durability.
本発明の高耐久性グラウト組成物は、粒径１．２～３．０mmの骨材を２５～３５質量％、粒径０．６～１．２mmの骨材を１０～１４質量％、粒径０．６mm以下の骨材を２０～３０質量％含有し、更に、セメント、減水剤、増粘剤及びポリマーディスパージョンを含有し、骨材セメント比が２．６～３．２であり、液体の質量が粉体質量の１０～１２％であることを特徴とする。 The highly durable grout composition of the present invention contains 25-35% by mass of aggregate with a particle size of 1.2-3.0 mm, 10-14% by mass of aggregate with a particle size of 0.6-1.2 mm, Contains 20 to 30% by mass of aggregates with a diameter of 0.6 mm or less, further contains cement, a water reducing agent, a thickener, and a polymer dispersion, and has an aggregate cement ratio of 2.6 to 3.2, It is characterized in that the mass of the liquid is 10 to 12% of the mass of the powder .
本発明の高耐久性グラウト組成物に用いるセメントは、水硬性セメントであればよく、例えば普通、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、エコセメント、アルミナセメント、並びにこれらの水硬性セメントに、フライアッシュ、高炉スラグ、シリカフューム又は石灰石微粉末等を混合した各種混合セメント等が挙げられ、これらの一種又は二種以上を使用することができる。本発明に用いるセメントとしては、左官施工し易いことから、珪酸カルシウムを主成分とするセメント又はアルミナセメントを主体としたセメントが好ましい。ここで珪酸カルシウムを主成分とするとは、含まれるセメントクリンカ粉砕物中において珪酸カルシウム鉱物（Ｃ３Ｓ、Ｃ２Ｓ）を５０質量％以上含むことをいい、好ましくは６０質量％以上含むことをいい、より好ましくは７０質量％以上含むことをいう。また、材齢１日において高い強度を得易いことから、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、エコセメント及びアルミナセメントから選ばれる一種又は二種以上を使用することが更に好ましい。 The cement used in the highly durable grout composition of the present invention may be any hydraulic cement, such as ordinary, early-strength, ultra-early-strength, low-heat and moderate-heat various types of Portland cement, ecocement, alumina cement, and these. Examples include various mixed cements in which hydraulic cement is mixed with fly ash, blast furnace slag, silica fume, fine limestone powder, etc., and one or more of these can be used. As the cement used in the present invention, a cement mainly composed of calcium silicate or a cement mainly composed of alumina cement is preferable because it is easy to perform plastering. Here, "having calcium silicate as a main component" means that the pulverized cement clinker contains 50% by mass or more of calcium silicate minerals (C3S, C2S), preferably 60% by mass or more, and more preferably means containing 70% by mass or more. In addition, it is more preferable to use one or more selected from ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, ecocement, and alumina cement because it is easy to obtain high strength at one day of age. .
本発明の高耐久性グラウト組成物に用いる骨材の種類は限定されず、モルタルやコンクリートで使用可能なものであればよく、例えば珪砂、石灰石砕砂等の砕砂、川砂、陸砂、海砂、人工軽量細骨材、パーライトやシラスバルーン等の無機質発泡粒、ポリスチレン粒やチレン酢酸エビニル粒等の有機質軽量骨材、高炉スラグ細骨材や電気炉酸化スラグ細骨材等のスラグ細骨材等の他、セメントクリンカ粒（セメントとして市販されているセメントクリンカ粉末よりも粗い粒状のもの）が使用可能で、これらの２種以上を併用してもよい。本発明に用いる。骨材としては、下地に対する付着力が高いことから、無機質発泡粒及び有機質軽量骨材以外のものが好ましく、更に人工軽量細骨材を除いたものから選ばれる1種又は２種以上のものがより好ましい。 The type of aggregate used in the highly durable grout composition of the present invention is not limited, as long as it can be used in mortar or concrete, such as crushed sand such as silica sand, crushed limestone sand, river sand, land sand, sea sand, etc. Artificial lightweight fine aggregates, inorganic foamed particles such as perlite and shirasu balloons, organic lightweight aggregates such as polystyrene particles and ethylene-vinyl acetate particles, slag fine aggregates such as blast furnace slag fine aggregates and electric furnace oxidation slag fine aggregates, etc. In addition, cement clinker granules (which are coarser than cement clinker powder commercially available as cement) can be used, and two or more of these may be used in combination. Used in the present invention. As the aggregate, materials other than inorganic foamed granules and organic lightweight aggregates are preferable because of their high adhesion to the substrate, and one or more types selected from those other than artificial lightweight fine aggregates are preferred. More preferred.
本発明において、粒径１．２～３．０mmの骨材とは、公称呼び寸法３．０mm（公称目開き（以下「目開き」と云う。）mm）の篩を通過し、公称呼び寸法１．２mm（目開き１．１８mm）の篩に留まる骨材をいう。（粒径１．２～２．５mmの骨材とは、公称呼び寸法２．５mm（公称目開き（以下「目開き」と云う。）２．３６mm）の篩を通過し、公称呼び寸法１．２mm（目開き１．１８mm）の篩に留まる骨材をいう。）、また、本発明において、粒径０．６～１．２mmの骨材とは、公称呼び寸法１．２mm（目開き１．１８mm）の篩を通過し、称呼び寸法０．６mm（目開き６００μm）の篩に留まる骨材をいう。また、粒径０．６以下の骨材とは、公称呼び寸法０．６mm（目開き６００μm）の篩を通過する骨材をいう。 In the present invention, aggregate with a particle size of 1.2 to 3.0 mm means that it passes through a sieve with a nominal size of 3.0 mm (nominal opening (hereinafter referred to as "mesh opening") mm), and has a nominal size of 3.0 mm. Refers to aggregate that can be passed through a 1.2 mm (opening 1.18 mm) sieve. (Aggregation with a particle size of 1.2 to 2.5 mm means that it passes through a sieve with a nominal size of 2.5 mm (nominal opening (hereinafter referred to as "mesh opening") 2.36 mm) and has a nominal size of 1. In the present invention, aggregate with a particle size of 0.6 to 1.2 mm refers to aggregate that passes through a sieve with a nominal size of 1.2 mm (1.18 mm opening). Refers to aggregate that passes through a sieve with a nominal size of 0.6 mm (600 μm opening). In addition, aggregate with a particle size of 0.6 or less refers to aggregate that passes through a sieve with a nominal size of 0.6 mm (600 μm opening).
粒径１．２～３．０mmの骨材、粒径０．６～１．２mmの骨材又は粒径０．６mm以下の骨材が上記範囲から外れると、脈動又はポンプ詰まりが生じ易く、或いは鉄筋が存在する状態で充填を行う場合に有害な空隙が生じる虞がある。 If aggregate with a particle size of 1.2 to 3.0 mm, aggregate with a particle size of 0.6 to 1.2 mm, or aggregate with a particle size of 0.6 mm or less falls outside the above range, pulsation or pump clogging is likely to occur. Alternatively, if filling is performed in the presence of reinforcing bars, harmful voids may be created.
本発明において、セメントの質量（Ｃ）に対する骨材の質量（Ｓ）の比率（骨材セメント比（Ｓ／Ｃ））を、２．６～３．４とする。このときの骨材セメント比（Ｓ／Ｃ）は、小数点第２位の数値を四捨五入した値とする。骨材セメント比（Ｓ／Ｃ）が、２．６～３．４のときは、強度特性およびモルタル作業性の点で優れる。骨材セメント比（Ｓ／Ｃ）が、２．６未満の時は、コンシステンシーが小さくモルタル作業性が不充分であり、３．４を超えるときは、強度特性が充分ではない。 In the present invention, the ratio of the aggregate mass (S) to the cement mass (C) (aggregate cement ratio (S/C)) is set to 2.6 to 3.4. The aggregate cement ratio (S/C) at this time is a value obtained by rounding off the value to the second decimal place. When the aggregate cement ratio (S/C) is 2.6 to 3.4, it is excellent in strength characteristics and mortar workability. When the aggregate cement ratio (S/C) is less than 2.6, the consistency is low and the mortar workability is insufficient, and when it exceeds 3.4, the strength properties are insufficient.
本発明に用いる減水剤の種類は限定されず、例えば、ポリカルボン酸塩系減水剤、ポリエーテル系減水剤、ナフタレンスルホン酸塩系減水剤、メラミンスルホン酸塩系減水剤及びリグニンスルホン酸塩系減水剤等の各種減水剤が挙げられ、これらの１種又は２種以上を用いることができる。減水剤として高性能減水剤又は高性能ＡＥ減水剤を用いると、モルタルの強度を高くし易いことから好ましい。本発明における減水剤とは、減水剤、高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤及び流動化剤等のセメント分散剤のことである。本発明における減水剤は、液状のものでも、粉末状のもでも、また、粉末状のものと液状のものを併用してもよい。本発明において、減水剤の含有量は、粉体質量の０．０１～２質量％であることが好ましい。これらの範囲では、乾燥収縮が小さく且つ強度特性に優れる。より好ましくは、粉体質量の０．０５～０．５質量％とする。 The type of water reducing agent used in the present invention is not limited, and examples thereof include polycarboxylate water reducing agents, polyether water reducing agents, naphthalene sulfonate water reducing agents, melamine sulfonate water reducing agents, and lignin sulfonate water reducing agents. There are various water reducing agents such as water reducing agents, and one or more of these can be used. It is preferable to use a high-performance water-reducing agent or a high-performance AE water-reducing agent as the water-reducing agent because it facilitates increasing the strength of the mortar. The water reducing agent in the present invention refers to cement dispersants such as water reducing agents, high performance water reducing agents, AE water reducing agents, high performance AE water reducing agents, and fluidizing agents. The water reducing agent in the present invention may be either liquid or powder, or a combination of powder and liquid may be used. In the present invention, the content of the water reducing agent is preferably 0.01 to 2% by mass based on the mass of the powder . Within these ranges, drying shrinkage is small and strength properties are excellent. More preferably, the amount is 0.05 to 0.5% by mass based on the mass of the powder .
本発明に用いる増粘剤は、その種類は限定されないが、例えばヒドロキシエチルメチルセルロース(ＨＥＭＣ)、ヒドロキシプロピルメチルセルロース(ＨＰＭＣ)、ヒドロキシエチルエチルセルロース (ＨＥＥＣ)等のヒドロキシアルキルアルキルセルロース、ヒドロキシエチルセルロース（ＨＥＣ）やヒドロキシプロピルセルロース（ＨＰＣ）等のヒドロキシアルキルセルロース等の水溶性セルロース；アルギン酸、β－１，３グルカン、プルラン、ウェランガム等の多糖類；アクリル樹脂やポリビニルアルコール等のポリビニル化合物；メチルスターチ、エチルスターチ、プロピルスターチ、メチルプロピルスターチ等のアルキルスターチ、ヒドロキシエチルスターチ又はヒドロキシプロピルスターチ等のヒドロキシアルキルスターチ、或いは、ヒドロキシプロピルメチルスターチ等のヒドロキシアルキルアルキルスターチ等スターチエーテル等が好ましい例として挙げられ、これらの一種又は二種 以上の使用が可能である。未硬化のモルタルがドライアウト、剥離、剥落、垂れ及び変形が起こり難 いことから、水溶性セルロース及び／又はスターチエーテルが好ましい。本発明における増粘剤の配 合割合は、粉体の質量に対し１００質量部に対し０．００１～０・０５質量％とすることが好ましい 。この範囲では、ドライアウトが起き難く高い付着力が得られ易く、寸法安定性にもより優れる。 The type of thickener used in the present invention is not limited, but for example, hydroxyalkylalkylcellulose such as hydroxyethylmethylcellulose (HEMC), hydroxypropylmethylcellulose (HPMC), hydroxyethylethylcellulose (HEEC), hydroxyethylcellulose (HEC), etc. Water-soluble cellulose such as hydroxyalkyl cellulose such as hydroxypropyl cellulose (HPC); polysaccharides such as alginic acid, β-1,3 glucan, pullulan, and welan gum; polyvinyl compounds such as acrylic resin and polyvinyl alcohol; methyl starch, ethyl starch, Preferred examples include alkyl starches such as propyl starch and methylpropyl starch, hydroxyalkyl starches such as hydroxyethyl starch and hydroxypropyl starch, and starch ethers such as hydroxyalkyl alkyl starches such as hydroxypropyl methyl starch. Or it is possible to use two or more types. Water-soluble cellulose and/or starch ether are preferred because uncured mortar is less likely to dry out, peel, flake, sag, or deform. The blending ratio of the thickener in the present invention is preferably 0.001 to 0.05% by mass per 100 parts by mass of the powder . Within this range, dryout is difficult to occur, high adhesion is easily obtained, and dimensional stability is also excellent.
本発明に用いるポリマーディスパージョンとしては、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の結合材として用いられるものであればよく、例えば、スチレン・ブタジエン共重合体，クロロプレンゴム，アクリロニトリル・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、天然ゴム、ポリエチレンやポリプロピレン等のポリオレフィン、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、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・ベオバ（t-デカン酸ビニルの商品名）共重合体等の酢酸ビニル系樹脂、不飽和ポリエステル樹脂、ポリウレタン樹脂、アルキド樹脂及びエポキシ樹脂等の合成樹脂、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が好ましい例として挙げられ、これらの１種又は２種以上を用いることができる。下地との接着が良いという理由から、本発明に使用するポリマーディスパージョンとしては、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・ベオバ（t-デカン酸ビニルの商品名）共重合体等の酢酸ビニル系樹脂；ポリアクリル酸エステル，ポリメタクリル酸エステル，アクリル酸エステル・スチレン共重合体，スチレン・アクリル共重合体，オールアクリル共重合体等のアクリル系樹脂；ポリエチレン及びポリプロピレン等のポリオレフィン系樹脂；スチレン・ブタジエン共重合体，クロロプレンゴム，アクリロニトリル・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から選ばれる１種又は２種以上を用いることが好ましい。ポリマーディスパージョンは、上記樹脂を水に乳化して安定化された液体状のもの（ポリマーエマルション）、又は水により再乳化するものであれば粉末状（再乳化型粉末樹脂）でもよく、何れか１種又は２種以上を併用してもよい。ポリマーディスパージョンの含有量は、下地への付着力が高く且つモルタルの作業性に優れることから、１０５℃における不揮発性分（以下「固形分」という。）換算で、粉体質量の０．２～０．８質量％が好ましい。 The polymer dispersion used in the present invention may be any one used as a binder for polymer cement mortar or polymer cement concrete, such as styrene-butadiene copolymer, chloroprene rubber, acrylonitrile-butadiene copolymer, or methyl methacrylate.・Synthetic rubber such as butadiene copolymer, natural rubber, polyolefin such as polyethylene and polypropylene, polychloropyrene, polyacrylic ester, styrene-acrylic copolymer, all-acrylic copolymer, polyvinyl acetate, vinyl acetate-acrylic copolymer Polymer, vinyl acetate/acrylic acid ester copolymer, modified vinyl acetate, ethylene/vinyl acetate copolymer, ethylene/vinyl acetate/vinyl chloride copolymer, vinyl acetate/vinyl versatate copolymer, acrylic/vinyl acetate/ Vinyl acetate resins such as Beova (trade name of vinyl t-decanoate) copolymer, synthetic resins such as unsaturated polyester resins, polyurethane resins, alkyd resins and epoxy resins, bituminous materials such as asphalt, rubber asphalt, and paraffin, etc. are mentioned as preferred examples, and one or more of these can be used. Polyvinyl acetate, vinyl acetate/acrylic copolymer, vinyl acetate/acrylic acid ester copolymer, modified vinyl acetate, and ethylene/acetic acid are used as polymer dispersions in the present invention because they have good adhesion to the substrate. Vinyl acetate resins such as vinyl copolymers, ethylene/vinyl acetate/vinyl chloride copolymers, vinyl acetate vinyl versatate copolymers, acrylic/vinyl acetate/Beova (trade name of vinyl t-decanoate) copolymers, etc. ; Acrylic resins such as polyacrylic esters, polymethacrylic esters, acrylic ester/styrene copolymers, styrene/acrylic copolymers, and all-acrylic copolymers; Polyolefin resins such as polyethylene and polypropylene; Styrene/butadiene It is preferable to use one or more types selected from synthetic rubbers such as copolymers, chloroprene rubber, acrylonitrile-butadiene copolymers, and methyl methacrylate-butadiene copolymers. The polymer dispersion may be a stabilized liquid by emulsifying the above resin in water (polymer emulsion), or a powder that can be re-emulsified with water (re-emulsifiable powder resin); You may use 1 type or 2 or more types together. The content of the polymer dispersion is 0.2 of the powder mass in terms of non-volatile content (hereinafter referred to as "solid content") at 105°C, since it has high adhesion to the base and is excellent in mortar workability. ~0.8% by mass is preferred.
本発明の高耐久性グラウト組成物には、粉体中にフライアッシュを５～１１質量％含有することが、モルタルの作業性に優れることから好ましい。本発明に用いるフライアッシュとしては、特に限定されないが、規格（ＪＩＳ Ａ ６２０１「コンクリート用フライアッシュ」）に適合するものであれば、鏝伸び性、鏝切れ性、表面平滑性等の鏝作業性に安定して優れ、更にポンプ圧送性にも安定して優れることから好ましい。 In the highly durable grout composition of the present invention, it is preferable that the powder contains 5 to 11% by mass of fly ash, since mortar workability is excellent. The fly ash used in the present invention is not particularly limited, but as long as it complies with the standard (JIS A 6201 "Fly ash for concrete"), it has properties such as trowel elongation, trowel cutting properties, and surface smoothness. It is preferable because it is stable and excellent in terms of performance, and also stable and excellent in pumping properties.
本発明の高耐久性グラウト組成物には、本発明の効果を喪失させない限り、上記成分以外の成分を含有するものであってもよい。上記以外の混和材料又は骨材から選ばれる一種又は二種以上を本発明の効果を実質損なわない範囲で併用することができる。このような成分としては、例えば、防水材、防錆剤、収縮低減剤、膨張材、石膏、アルカリ金属硫酸塩等の凝結促進剤、顔料、繊維、撥水剤、白華防止剤、急結剤（材）、急硬剤（材）、凝結遅延剤、消泡剤、発泡剤、消石灰、シリカフュームや火山灰等のフライアッシュ以外のポゾラン、空気連行剤、表面硬化剤、川砂利、陸砂利、砕石、人工粗骨材等が挙げられる。本発明の高耐久性グラウト組成物には、尿素、膨張材、石膏、アルカリ金属硫酸塩から選ばれる１種又は２種以上を含有することが好ましい。尚、本発明で使用される混和材料は、粉末状でも水溶液状でも使用可能である。 The highly durable grout composition of the present invention may contain components other than the above-mentioned components as long as the effects of the present invention are not lost. One or more selected from admixtures or aggregates other than those mentioned above may be used in combination within a range that does not substantially impair the effects of the present invention. Such components include, for example, waterproofing materials, rust preventive agents, shrinkage reducing agents, expansion agents, gypsum, setting accelerators such as alkali metal sulfates, pigments, fibers, water repellents, efflorescence inhibitors, rapid setting agents, etc. agent (material), quick hardening agent (material), setting retardant, antifoaming agent, foaming agent, slaked lime, pozzolan other than fly ash such as silica fume and volcanic ash, air entraining agent, surface hardening agent, river gravel, land gravel, Examples include crushed stone and artificial coarse aggregate. The highly durable grout composition of the present invention preferably contains one or more selected from urea, expansive materials, gypsum, and alkali metal sulfates. Incidentally, the admixture used in the present invention can be used in the form of a powder or an aqueous solution.
本発明の高耐久性グラウト組成物に尿素を含有させると、中性化抵抗性が増すことから好ましい。本発明において尿素を用いる場合、中性化抵抗性が高いことから粉体質量の０．３～２質量％が好ましく、より好ましく０．５～１質量％、更には０．６～０．９質量とする。 It is preferable to include urea in the highly durable grout composition of the present invention because it increases the neutralization resistance. When using urea in the present invention, it is preferably 0.3 to 2% by mass of the powder mass , more preferably 0.5 to 1% by mass, and even more preferably 0.6 to 0.9% by mass, since it has high neutralization resistance. Mass.
本発明に用いる膨張材としては、水和反応により、エトリンガイトや水酸化カルシウムを生成するものであればよく、カルシウムサルフォアルミネート系（エトリンガイト系）膨張材、カルシウムアル ミノフェライト系膨張材、（生）石灰系膨張材、エトリンガイト－石灰複合系膨張材及び石膏系膨張材等が挙げられ、これらの一種又は二種以上が使用可能であり好ましい。膨張材を含有することにより、硬化後のポリマーセメントモルタルの収縮が抑制されてひび割れが発生し難くなることに加え、高い寸法安定性が得られるため、下地となるコンクリートや鉄筋との一体性が保たれる。本発明において膨張材を用いる場合、高い寸法安定性が得られることから粉体質量の０．０５～０．５質量％が好ましく、より好ましく０．０８～０．３質量％、更には０．１～０．２質量とする。 The expanding material used in the present invention may be one that generates ettringite or calcium hydroxide through a hydration reaction, such as a calcium sulfoaluminate-based (ettringite-based) expanding material, a calcium aluminoferrite-based expanding material, Examples include lime-based expansive materials, ettringite-lime composite expansive materials, and gypsum-based expansive materials, and one or more of these can be used and are preferred. By containing an expansive material, the shrinkage of the polymer cement mortar after hardening is suppressed, making it difficult for cracks to occur.In addition, high dimensional stability is obtained, so it maintains integrity with the underlying concrete and reinforcing steel. It is maintained. When using an expanding material in the present invention, it is preferably 0.05 to 0.5% by mass, more preferably 0.08 to 0.3% by mass, and even more preferably 0.05 to 0.5% by mass, based on the powder mass , since high dimensional stability can be obtained. The mass should be 1 to 0.2.
本発明の高耐久性グラウト組成物に用いる石膏としては、無水石膏、二水石膏又は半水石膏を主成分とする粉末であれば特に限定されないが、強度増進作用の観点からII型無水石膏を主成分とするものが好ましい。石膏は、セメント中のアルミネート相等と反応しエトリンガイト（３ＣａＯ・Ａｌ２Ｏ３・３ＣａＳＯ４・３２Ｈ２Ｏ）を生成させ、これによりグラウト硬化体の収縮を抑制することができるとともに、強度を高めることができる。使用する石膏の粉末度はブレーン法による比表面積で３０００ｃｍ２／ｇ以上のものが、反応活性が得られるので好ましい。より好ましくは粉末度が５０００ｃｍ２／ｇ以上の石膏が良い。粉末度の上限は特に制限されないが、粉末度を高めるコストが嵩む割にはその効果が鈍化することから概ね１５０００ｃｍ２／ｇ程度が適当である。本発明において石膏を用いる場合、粉体質量の０．０５～０．３５質量％が好ましい、より好ましくは０．１～０．３質量％ とする。。 The gypsum used in the highly durable grout composition of the present invention is not particularly limited as long as it is a powder containing anhydrite, dihydrate, or hemihydrate as a main component, but type II anhydrite is used from the viewpoint of strength enhancement. Preferably, it is the main component. Gypsum reacts with the aluminate phase in cement to generate ettringite (3CaO.Al 2 O 3.3CaSO 4.32H 2 O), which suppresses shrinkage of the hardened grout and increases its strength. be able to. The gypsum used preferably has a specific surface area of 3000 cm 2 /g or more as determined by the Blaine method, since this provides reaction activity. More preferably, gypsum has a fineness of 5000 cm 2 /g or more. The upper limit of the fineness is not particularly limited, but the effect of increasing the fineness decreases as the cost increases, so approximately 15,000 cm 2 /g is appropriate. When gypsum is used in the present invention, it is preferably 0.05 to 0.35% by mass, more preferably 0.1 to 0.3% by mass of the powder mass . .
本発明の高耐久性グラウト組成物に用いるアルカリ金属硫酸塩としては、硫酸ナトリウム、硫酸カリウム、焼きミョウバンから選ばれる１種又は２種以上が好ましい。本発明においてアルカリ金属硫酸塩を用いると、凝結時間が短縮し、減水剤，ポリマーディスパージョン，増粘剤等の混和により遅延する凝結時間を短くすることができ、材料分離の抑制や適正な流動性を得るために硬化がある。本発明においてアルカリ金属硫酸塩を用いる場合、適正な流動性を得易く作業時間を長いことから、粉体質量の０．０１～０．１質量％が好ましい。 The alkali metal sulfate used in the highly durable grout composition of the present invention is preferably one or more selected from sodium sulfate, potassium sulfate, and burnt alum. When an alkali metal sulfate is used in the present invention, the setting time can be shortened, and the setting time that is delayed by mixing water reducing agents, polymer dispersions, thickeners, etc. can be shortened, and material separation can be suppressed and proper flow can be achieved. There is hardening to obtain properties. When using an alkali metal sulfate in the present invention, it is preferably 0.01 to 0.1% by mass of the powder mass because it is easy to obtain appropriate fluidity and the working time is long.
本発明の高耐久性グラウト組成物は、液体の質量が粉体質量の１０～１２％、つまり、粉体質量に対する液体質量の割合が１０～１２％とする。ここで、液体の質量には、添加する水以外に、ポリマーディスパージョンやその他の液状混和材料に含まれる溶媒や分散媒としての水も考慮する。本発明の高耐久性グラウト組成物は、液体の質量が粉体質量の１０～１２％であるので、乾燥収縮率が小さく、作業性に優れる。１０％未満では作業性（流動性）が不足し、１２％を超えると乾燥収縮が大きい。 In the highly durable grout composition of the present invention, the mass of the liquid is 10 to 12% of the mass of the powder , that is, the ratio of the mass of the liquid to the mass of the powder is 10 to 12%. Here, the mass of the liquid takes into consideration water as a solvent or dispersion medium contained in the polymer dispersion or other liquid admixtures, in addition to the water to be added. Since the highly durable grout composition of the present invention has a liquid mass of 10 to 12% of the powder mass , the drying shrinkage rate is small and the workability is excellent. If it is less than 10%, workability (fluidity) is insufficient, and if it exceeds 12%, drying shrinkage is large.
また、本発明の高耐久性グラウト組成物は、上記のセメント、骨材、混和材料を混合することにより製造する。混合に用いる器具又は装置は特に限定されないが、ミキサを用いることが量を多く混練できるので好ましい。用いることのできるミキサとしては連続式ミキサでもバッチ式ミキサでも良く、例えば強制二軸式コンクリートミキサ、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、グラウトミキサ、ハンドミキサ、左官ミキサ等が挙げられる。 Moreover, the highly durable grout composition of the present invention is manufactured by mixing the above-mentioned cement, aggregate, and admixture. Although there are no particular restrictions on the equipment or equipment used for mixing, it is preferable to use a mixer because a large amount can be kneaded. The mixer that can be used may be a continuous mixer or a batch mixer, such as a forced twin-screw concrete mixer, a pan type concrete mixer, a pug mill type concrete mixer, a gravity type concrete mixer, a grout mixer, a hand mixer, a plastering mixer, etc. Can be mentioned.
［実施例１］
以下に示す使用材料を用い、表１～表４に示す配合割合で各水準６ｋｇのグラウト組成物を作製した。グラウト組成物の作製方法は、予め粉体（固形物）のセメント、骨材、混和材料を乾式混合しておき、ミキサにより水及び水にポリマーが分散しているポリマーディスパージョンとともに混合することでグラウト組成物（グラウト材）を作製した。作製したグラウト材の品質試験として、以下に示す通り、ポンプ圧送試験、充填性試験、乾燥収縮試験、付着試験、強度試験、モルタル作業性試験、中性化抵抗性試験、及び遮塩性試験を行い、その結果を配合とともに表１～表４に示した。
[Example 1]
Using the materials shown below, 6 kg of grout compositions were prepared for each level at the mixing ratios shown in Tables 1 to 4. The grout composition is prepared by dry- mixing powder ( solid ) cement, aggregate, and admixtures in advance, and then using a mixer to mix them with water and a polymer dispersion in which polymers are dispersed in water. A grout composition (grout material) was produced. As a quality test for the prepared grout material, we conducted a pump pumping test, a filling test, a drying shrinkage test, an adhesion test, a strength test, a mortar workability test, a carbonation resistance test, and a salt barrier test, as shown below. The results are shown in Tables 1 to 4 along with the formulation.
＜使用材料＞
・セメント： 普通ポルトランドセメント（太平洋セメント社製）、記号：ＯＰＣ
・フライアッシュ： 常磐火力産業社製フライアッシュ（ＪＩＳ II種相当）、記号：ＦＡ
・減水剤： ポリカルボン酸系高性能減水剤「ＮＦ－２００」（製品名）（粉末、太平洋マテリアル社製）、記号：ＳＰ
・膨張材： 石灰系膨張材「太平洋Ｎ－ＥＸ」（製品名）（太平洋マテリアル社製）、記号：ＥＸ
・骨材：
(１)骨材１： 珪砂（粒径１．２～３．０mm、岐阜県土岐産、絶乾状態）、記号：Ｓ１
(２)骨材２： 珪砂（粒径０．６～１．２mm、岐阜県土岐産、絶乾状態）、記号：Ｓ２
(３)骨材３： 珪砂（粒径０．１５～０．６mm、愛知県三河産、絶乾状態）、記号：Ｓ３
・増粘剤
(１)増粘剤１：水溶性セルロース「マーポローズ90MP-30000」（製品名）（松本油脂社製）、記号：ＭＣ
(２)増粘剤２：スターチエーテル「Starvis SE25F」（製品名）（ＢＡＳＦ社製）、記号：ＳＥ
・アルカリ金属硫酸塩： 硫酸ナトリウム（Ｎａ２ＳＯ４）、１級試薬、記号：Na2SO4
・石膏： II型無水石膏（ＣａＳＯ４）、ブレーン比表面積７０００cm２／g、記号：CaSO4
・尿素： 尿素（ＣＯ（ＮＨ２）２）、１級試薬、記号：CO(NH2)2
・ポリマーディスパージョン： スチレン・ブタジエン共重合体合成ゴム（ＳＢＲ）系ポリマーエマルション、固形分含有率５０質量％
<Materials used>
・Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.), symbol: OPC
・Fly ash: Fly ash manufactured by Joban Kapower Sangyo Co., Ltd. (equivalent to JIS II type), symbol: FA
・Water reducer: Polycarboxylic acid-based high performance water reducer "NF-200" (product name) (powder, manufactured by Taiheiyo Materials Co., Ltd.), symbol: SP
・Expansion material: Lime-based expansion material "Taiheiyo N-EX" (product name) (manufactured by Taiheiyo Materials Co., Ltd.), symbol: EX
·aggregate:
(1) Aggregate 1: Silica sand (particle size 1.2 to 3.0 mm, produced in Toki, Gifu Prefecture, bone dry), symbol: S1
(2) Aggregate 2: Silica sand (particle size 0.6 to 1.2 mm, produced in Toki, Gifu Prefecture, bone dry), symbol: S2
(3) Aggregate 3: Silica sand (particle size 0.15 to 0.6 mm, produced in Mikawa, Aichi Prefecture, bone dry), symbol: S3
・Thickener
(1) Thickener 1: Water-soluble cellulose "Marporose 90MP-30000" (product name) (manufactured by Matsumoto Yushi Co., Ltd.), symbol: MC
(2) Thickener 2: Starch ether "Starvis SE25F" (product name) (manufactured by BASF), symbol: SE
・Alkali metal sulfate: Sodium sulfate (Na 2 SO 4 ), primary reagent, symbol: Na2SO4
・Gypsum: Type II anhydrite (CaSO4), Blaine specific surface area 7000cm 2 /g, symbol: CaSO4
・Urea: Urea (CO( NH2 ) 2 ), primary reagent, symbol: CO(NH2)2
・Polymer dispersion: Styrene-butadiene copolymer synthetic rubber (SBR) based polymer emulsion, solid content 50% by mass
作製したポリマーセメントモルタルの品質試験として、以下に示す通り、施工性試験、耐アルカリ性試験、付着強さ試験及び防せい性試験を行った。これらの結果及び評価を表２に示した。 As quality tests for the produced polymer cement mortar, a workability test, an alkali resistance test, an adhesion strength test, and a rust prevention test were conducted as shown below. These results and evaluations are shown in Table 2.
＜品質試験方法＞
・ポンプ圧送試験
スクイズポンプにより内径５０mm・長さ８０ｍホースを用いてグラウト材を１５分間圧送し、脈動及び詰まりが何れも発生しなかったものを「良好」（記号：○）、それ以外を「問題あり」（記号：×）とした。
・充填性試験
ＮＥＸＣＯ試験方法「試験法４３２－２００６」に規定されている「鉄筋背面への充填性試験」により、目視にて空隙を確認した。評価は、鉄筋付近に空隙が見られなかったものを「良好」（記号：○）とし、鉄筋付近に空隙が見られたものを「不良」（記号：×）とした。
・乾燥収縮試験
温度２０℃、湿度８０％の恒温恒湿槽でモルタルを内径４×４×１６ｃｍの型枠に充填し、２４時間養生した後脱型・基長し、その後材齢９１日まで２０℃相対湿度６０％で養生し、ＪＩＳ Ａ１１２ ９－３「モルタル及びコンクリートの長さ変化試験方法」に準じて測定し、長さ変化率を算出し、収縮率を求めた。評価は、収縮率が５００μ以下であるものを「良好」（記号：○）、５００μを超えるものを「不良」（記号：×）とした。
・付着試験
ＪＩＳ Ａ １１７１に規定される「接着強さ試験」に準拠して材齢２８日における付着強さを測定した。評価は、材齢２８日における付着強さが、１．０Ｎ／mm２以上のものを「良好」（記号：○）とし、それ以外を「不足」（記号：×）とした。
・強度試験
ＪＩＳ Ａ １１７１に規定される「圧縮強さ試験」準拠して材齢２８日における圧縮強さを測定した。評価は、材齢２８日における圧縮強さが、４０Ｎ／mm２以上のものを「良好」（記号：○）とし、それ以外を「不足」（記号：×）とした。
・モルタル作業性試験
ＪＩＳ Ａ １１７１に規定される「フロー試験」に準拠してフロー値を測定した。評価は、フロー値が２１０～２７０mmのものを「良好」（記号：○）とし、それ以外を「不良」（記号：×）とした。フロー値が２１０mm以下の場合は流動性（コンシステンシー）が不足しており充填作業が行い難く、２７０mmを超える場合は流動性が過剰で材料分離が生じ易くポンプ詰まりも生じ易いという問題がある。
・中性化抵抗性試験
ＪＩＳ Ｒ ５２０１に準じて作製したモルタル（ＪＩＳモルタル）との比較するように、ＪＩＳ Ａ １１５３に規定される促進中性化試験を実施した。評価は、材齢９１日における中性化深さがＪＩＳモルタルの８０％以下のものを「良好」（記号：○）、６０％以下のものを「優良」（記号：◎）とし、ＪＩＳモルタルよりも少ないがＪＩＳモルタルの８０％を超えているものを「不足」（記号：△）、ＪＩＳモルタルと同じ又は大きき場合を「不良」（記号：×）とした。
・遮塩性試験
ＪＩＳ Ｒ ５２０１に準じて作製したモルタル（ＪＩＳモルタル）との比較するように、１０％塩化ナトリウム水溶液による浸漬試験を実施し、材齢９１日における塩化物イオン浸透深さをＪＩＳ Ａ １１７１に規定される「塩化物イオン浸透深さ試験」 により測定し、ＪＩＳモルタルの６０％以下のものを「良好」（記号：○）とし、それ以外を「不足」（記号：×）とした。
<Quality test method>
・Pump feeding test Grout material is pumped for 15 minutes using a squeeze pump with an inner diameter of 50 mm and a length of 80 m hose, and if no pulsation or clogging occurs, it is ``good'' (symbol: ○), otherwise it is ``good''. There is a problem” (symbol: ×).
・Fillability test The voids were visually confirmed by the "fillability test on the back side of reinforcing bars" specified in the NEXCO test method "Test method 432-2006". In the evaluation, those in which no voids were observed near the reinforcing bars were rated "good" (symbol: ○), and those in which voids were found near the reinforcing bars were rated "poor" (symbol: x).
・Drying shrinkage test Mortar was filled into a formwork with an inner diameter of 4 x 4 x 16 cm in a constant temperature and humidity chamber at a temperature of 20°C and a humidity of 80%, and after curing for 24 hours, the mold was removed and the base length was removed, and then the material age was 91 days. It was cured at 20° C. and 60% relative humidity, and measured according to JIS A112 9-3 "Length change test method for mortar and concrete" to calculate the length change rate and determine the shrinkage rate. In the evaluation, those whose shrinkage ratio was 500μ or less were rated "good" (symbol: ○), and those whose shrinkage ratio exceeded 500μ were rated "poor" (symbol: ×).
- Adhesion test The adhesion strength at 28 days of material age was measured in accordance with the "adhesion strength test" specified in JIS A 1171. In the evaluation, those with adhesive strength of 1.0 N/mm 2 or more at the age of 28 days were evaluated as "good" (symbol: ○), and the others were evaluated as "insufficient" (symbol: ×).
- Strength test The compressive strength at the age of 28 days was measured in accordance with the "compressive strength test" specified in JIS A 1171. In the evaluation, those whose compressive strength at 28 days of age was 40 N/mm 2 or more were rated "good" (symbol: ○), and the others were rated "insufficient" (symbol: ×).
- Mortar workability test The flow value was measured in accordance with the "flow test" specified in JIS A 1171. For evaluation, those with a flow value of 210 to 270 mm were rated as "good" (symbol: ○), and the others were rated as "poor" (symbol: ×). If the flow value is less than 210 mm, the fluidity (consistency) is insufficient, making it difficult to perform the filling operation, and if it exceeds 270 mm, the fluidity is excessive, causing material separation and pump clogging.
-Neutralization resistance test An accelerated neutralization test specified in JIS A 1153 was conducted to compare with mortar prepared according to JIS R 5201 (JIS mortar). In the evaluation, if the carbonation depth at 91 days is 80% or less of JIS mortar, it is considered "good" (symbol: ○), and if it is 60% or less, it is "excellent" (symbol: ◎). If it is less than 80% of the JIS mortar but exceeds 80% of the JIS mortar, it is considered "insufficient" (symbol: △), and if it is the same as or larger than the JIS mortar, it is considered "defective" (symbol: ×).
・Salt blocking property test In order to compare with mortar made according to JIS R 5201 (JIS mortar), an immersion test with a 10% sodium chloride aqueous solution was conducted, and the depth of chloride ion penetration at 91 days of material age was determined according to JIS mortar. Measured by the "chloride ion penetration depth test" specified in A 1171, those that are 60% or less of JIS mortar are considered "good" (symbol: ○), and the rest are "insufficient" (symbol: ×). did.
本発明の実施例に当たるグラウト組成物は、混練したグラウト材が、作業性、ポンプ圧送性、充填性、付着性、強度発現性、乾燥収縮性に優れ、且つ中性化抵抗性及び遮塩性に優れる高耐久性グラウト組成物に関する。より詳しくは、混練したグラウト材が、ＪＩＳ Ａ １１７１「ポリマーセメントモルタルの試験方法」６．２「フロー試験」に準拠して測定したフロー値が２１０～２７０mm、脈動やポンプ詰まりを起こさずにポンプ圧送でき、鉄筋が存在する状態で充填を行っても有害な空隙が生じ難く、下地との付着強度が１．０Ｎ／mm２以上あり、材齢２８日で４０Ｎ／mm２以上の圧縮強度があり、材齢３ヶ月（９１日）で乾燥収縮性が５×１０－４（５００μ）以下であり、且つ材齢３ヶ月（９１日）における中性化深さ及び塩化物イオン浸透深さが、ＪＩＳモルタルの測定結果の６０％以下である高耐久性グラウト組成物であった。 In the grout composition according to the embodiment of the present invention, the kneaded grout material has excellent workability, pumping properties, filling properties, adhesion properties, strength development properties, and drying shrinkage properties, and also has carbonation resistance and salt blocking properties. The present invention relates to a highly durable grout composition with excellent properties. More specifically, the kneaded grout material has a flow value of 210 to 270 mm as measured in accordance with JIS A 1171 "Testing Methods for Polymer Cement Mortar" 6.2 "Flow Test", and the pump can be pumped without causing pulsation or pump clogging. It can be pumped, does not create harmful voids even when filled with reinforcing bars, has an adhesive strength of 1.0 N/ mm2 or more with the substrate, and has a compressive strength of 40 N/mm2 or more at 28 days of age. The drying shrinkage is 5×10 -4 (500μ) or less at the age of 3 months (91 days), and the depth of neutralization and the depth of chloride ion penetration at the age of 3 months (91 days) are It was a highly durable grout composition that was 60% or less of the measurement result of JIS mortar.
本発明は、鉄筋コンクリート造構造物を補修する場合に、断面修復用グラウト材として好適に使用するこ とができる。 The present invention can be suitably used as a cross-sectional repair grout when repairing reinforced concrete structures.
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| JP2012140265A (en) | 2010-12-28 | 2012-07-26 | Taiheiyo Materials Corp | Polymer cement mortar |
| JP2014129209A (en) | 2012-12-28 | 2014-07-10 | Taiheiyo Material Kk | Grout composition and grout material |
| JP2017149599A (en) | 2016-02-24 | 2017-08-31 | 太平洋マテリアル株式会社 | Non-shrink grout composition |
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| JP2012140265A (en) | 2010-12-28 | 2012-07-26 | Taiheiyo Materials Corp | Polymer cement mortar |
| JP2014129209A (en) | 2012-12-28 | 2014-07-10 | Taiheiyo Material Kk | Grout composition and grout material |
| JP2017149599A (en) | 2016-02-24 | 2017-08-31 | 太平洋マテリアル株式会社 | Non-shrink grout composition |
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