JP6682309B2 - Grout composition - Google Patents
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- JP6682309B2 JP6682309B2 JP2016053832A JP2016053832A JP6682309B2 JP 6682309 B2 JP6682309 B2 JP 6682309B2 JP 2016053832 A JP2016053832 A JP 2016053832A JP 2016053832 A JP2016053832 A JP 2016053832A JP 6682309 B2 JP6682309 B2 JP 6682309B2
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- 239000011440 grout Substances 0.000 title claims description 38
- 239000000203 mixture Substances 0.000 title claims description 35
- 239000004568 cement Substances 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 22
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 235000019738 Limestone Nutrition 0.000 claims description 10
- 239000006028 limestone Substances 0.000 claims description 10
- 239000004088 foaming agent Substances 0.000 claims description 6
- 230000000740 bleeding effect Effects 0.000 description 14
- 238000011161 development Methods 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000004898 kneading Methods 0.000 description 9
- 239000011398 Portland cement Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000002562 thickening agent Substances 0.000 description 4
- 239000002518 antifoaming agent Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 101100222017 Candida albicans (strain SC5314 / ATCC MYA-2876) CSA2 gene Proteins 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 229910052936 alkali metal sulfate Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 101150042828 csa1 gene Proteins 0.000 description 1
- 101150076151 csa3 gene Proteins 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- -1 setting retarder Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、土木・建築業界において使用されるグラウト組成物に関する。 The present invention relates to grout compositions used in the civil and construction industry.
土木・建築工事において、コンクリート構造物の細かい空隙の充填、構造物の補修および補強等を目的として、モルタルやセメントペーストを充填するグラウト工事が行われており、それに用いる各種グラウト材が開発されている。従来から、グラウト材料はセメント、減水剤、膨張材、発泡剤、増粘剤および骨材等から構成されている。
一般にグラウトおよびモルタルは水量が多い配合となっており、ブリーディングの発生が懸念されている。その課題に対して、ポゾラン系微粉末を使用しブリーディングの抑制が図られてきた（特許文献１）。
In civil engineering and construction work, grouting work for filling mortar and cement paste is carried out for the purpose of filling fine voids in concrete structures, repairing and reinforcing structures, etc. Various grout materials used for it are being developed. There is. Conventionally, grout materials are composed of cement, water reducing agents, expanding agents, foaming agents, thickening agents, aggregates, and the like.
In general, grout and mortar have a large amount of water, and there is a concern that bleeding may occur. To solve the problem, it has been attempted to suppress bleeding by using a pozzolanic fine powder (Patent Document 1).
近年、コンクリート構造物の高強度化に伴い、グラウト材の圧縮強度の要求性能が高強度してきている。常温環境下のみならず低温環境下での強度発現性が良好なグラウト材が求められている。低温環境下での強度発現性の改善を図るため、ギ酸塩または硫酸アルミニウム等の凝結調整剤を使用している（特許文献２）。 In recent years, along with the increase in strength of concrete structures, the required performance of compressive strength of grout materials has become stronger. There is a demand for a grout material that exhibits good strength development not only in a room temperature environment but also in a low temperature environment. In order to improve strength development in a low temperature environment, a coagulation modifier such as formate or aluminum sulfate is used (Patent Document 2).
しかしながら、ポゾラン系微粉末を使用することでブリーディングの抑制が図られる一方で所望の流動性を得るには水量が多量となり、水量の調整次第で強度発現の低下の恐れがあった。またポゾラン系微粉末は、コスト面においても安価とは言い難く、用途が限定される。また、ギ酸塩や硫酸アルミニウム等の凝結調整剤を用いることで、凝結時間および初期強度発現性が改善できるものの、流動性の点では、特に低温環境下でまだ課題があった。さらに、長期強度発現性についても必ずしも、良好とは言えず、課題であった。 However, while using pozzolanic fine powder can suppress bleeding, the amount of water becomes large in order to obtain the desired fluidity, and there is a risk that strength development may decrease depending on the adjustment of the amount of water. Further, the pozzolanic fine powder cannot be said to be inexpensive in terms of cost, and its use is limited. Although the setting time and initial strength development can be improved by using a setting regulator such as formate or aluminum sulfate, there is still a problem in terms of fluidity especially in a low temperature environment. Further, the long-term strength development was not always good, and there was a problem.
従って、本発明の課題は、常温環境下に限らず低温環境下においても、良好な流動性を保持しながらブリーディングを発生させず、且つ高い強度発現性のグラウト組成物を提供することにある。 Therefore, an object of the present invention is to provide a grout composition which does not cause bleeding while maintaining good fluidity and has high strength development, not only under normal temperature environment but also under low temperature environment.
そこで本発明者は、グラウトの構成材料に、セメント、減水剤、特定粒度のアウインおよび特定の粒度構成の石灰石骨材を使用し、これらを特定の配合量にすることで、前記課題を解決できることを見出し、本発明を完成した。 Therefore, the present inventor uses a cement, a water reducing agent, a huin of a specific particle size and a limestone aggregate of a specific particle size composition as a constituent material of the grout, and by setting these to a specific compounding amount, it is possible to solve the above problems. And completed the present invention.
すなわち、本発明は、次の〔１〕〜〔４〕を提供するものである。 That is, the present invention provides the following [1] to [4].
〔１〕（Ａ）セメント１００質量部、（Ｂ）減水剤０．５〜１．５質量部、（Ｃ）ブレーン比表面積２０００〜６０００ｃｍ2／ｇであるアウイン０．３〜２質量部、および（Ｄ）粒径１．２ｍｍ以上２．５ｍｍ未満が２５〜４０質量％、粒径０．６ｍｍ以上１．２ｍｍ未満が２５〜４５質量％、粒径０．３ｍｍ以上０．６ｍｍ未満が２０〜３５質量％、粒径０．３ｍｍ未満が１０〜３５質量％の粒度構成である石灰石骨材９０〜１１０質量部を含有することを特徴とするグラウト組成物。
〔２〕さらに、（Ｅ）促進剤を含有する〔１〕記載のグラウト組成物。
〔３〕水／セメント比（含有質量比率）が３２〜４０％である〔１〕または〔２〕記載のグラウト組成物。
〔４〕さらに、（Ｆ）膨張材および（Ｇ）発泡剤を含有し、無収縮性である〔１〕〜〔３〕のいずれかに記載のグラウト組成物。
[1] (A) 100 parts by mass of cement, (B) 0.5 to 1.5 parts by mass of water-reducing agent, (C) 0.3 to 2 parts by mass of arain having a Blaine specific surface area of 2000 to 6000 cm 2 / g, and (D) Particle size of 1.2 mm or more and less than 2.5 mm is 25 to 40% by mass, particle size of 0.6 mm or more and less than 1.2 mm is 25 to 45% by mass, and particle size of 0.3 mm or more and less than 0.6 mm is 20 to 20% by mass. A grout composition comprising 90 to 110 parts by mass of limestone aggregate having a particle size composition of 35% by mass and a particle size of less than 0.3 mm of 10 to 35% by mass.
[2] The grout composition according to [1], further containing (E) an accelerator.
[3] The grout composition according to [1] or [2], which has a water / cement ratio (content mass ratio) of 32 to 40%.
[4] The grout composition according to any one of [1] to [3], which further contains (F) an expanding material and (G) a foaming agent and is non-shrinkable.
常温環境下に限らず低温環境下において、良好な流動性を保持しながらブリーディングを発生させず、且つ高い強度発現性のグラウト組成物が提供できる。 It is possible to provide a grout composition which does not cause bleeding while maintaining good fluidity and has high strength development not only in a room temperature environment but also in a low temperature environment.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明で使用する（Ａ）セメントは、普通、早強、超早強、低熱、及び中庸熱等の各種ポルトランドセメント、これらポルトランドセメントに、高炉スラグ、フライアッシュ、またはシリカを混合した各種混合セメント、また、石灰石粉末等の高炉徐冷スラグ微粉末を混合したフィラーセメント、各種の産業廃棄物を主原料として製造される環境調和型セメント、いわゆる、エコセメントなどが挙げられ、これらのうちの１種または２種以上が併用可能である。本発明では初期強度発現性や材料分離抵抗性の観点から、普通ポルトランドセメントや早強ポルトランドセメントを選定することが好ましい。 The (A) cement used in the present invention is various portland cements such as normal, early-strength, super-early-strength, low heat, and moderate heat, and various mixed cements obtained by mixing these portland cements with blast furnace slag, fly ash, or silica. Further, there are filler cement mixed with blast furnace slowly cooled slag fine powder such as limestone powder, environmentally friendly cement produced by using various industrial wastes as main raw materials, so-called ecocement, and the like. One kind or two or more kinds can be used in combination. In the present invention, it is preferable to select ordinary Portland cement or early-strength Portland cement from the viewpoints of initial strength development and material separation resistance.
本発明においては、流動性を得やすくするため、（Ｂ）減水剤を使用する。本発明で使用する減水剤とは、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り、これらの１種または２種以上を用いることが出来る。具体的には、ナフタレンスルホン酸系減水剤、リグニンスルホン酸塩系減水剤、ポリカルボン酸系減水剤、メラミンスルホン酸塩系減水剤等が挙げられる。
本発明グラウト組成物中の（Ｂ）減水剤の含有量は、セメント１００質量部に対して０．５〜１．５質量部である。０．５質量部未満では流動性が充分でない場合があり、１．５質量部を超えると材料分離を起こす場合がある。好ましくは、０．６５〜０．８５質量部である。
In the present invention, the water reducing agent (B) is used in order to easily obtain fluidity. The water reducing agent used in the present invention is a cement dispersant such as a water reducing agent, a high-performance water reducing agent, an AE water reducing agent, a high-performance AE water reducing agent, and a superplasticizer. Can be used. Specific examples include naphthalene sulfonic acid type water reducing agents, lignin sulfonate type water reducing agents, polycarboxylic acid type water reducing agents, and melamine sulfonate type water reducing agents.
The content of the water reducing agent (B) in the grout composition of the present invention is 0.5 to 1.5 parts by mass with respect to 100 parts by mass of cement. If it is less than 0.5 parts by mass, fluidity may not be sufficient, and if it exceeds 1.5 parts by mass, material separation may occur. It is preferably 0.65 to 0.85 parts by mass.
本発明においては、ブリーディング抑制のため、水和反応が早く、エトリンガイトを生成し速硬性を付与することのできる（Ｃ）アウイン（３ＣａＯ・３Ａｌ2Ｏ3・ＣａＳＯ4）を使用する。
アウインの粉末度はブレーン比表面積（以下、ブレーン値という）で２０００〜６０００ｃｍ2／ｇであり、２５００〜５０００ｃｍ2／ｇが好ましい。２０００ｃｍ2／ｇ未満ではブリーディングが生じやすい場合があり、６０００ｃｍ2／ｇを超えると流動性が悪くなる恐れがある。
本件グラウト組成物中の（Ｃ）アウインの含有量は、セメント１００質量部に対して、０．３〜２．０質量部である。０．３質量部未満では、速硬性の効果が小さく、ブリーディングの発生の恐れがあり、２．０質量部を超えると流動性が低下する恐れがある。好ましくは、０．５〜１．０質量部である。
In the present invention, since the bleed suppression, the hydration reaction is faster, uses the can impart generated rapid hardening ettringite (C) Auin (3CaO · 3Al 2 O 3 · CaSO 4).
Fineness of Auin the Blaine specific surface area (hereinafter, referred to as Blaine) and 2000~6000cm 2 / g in, 2500~5000cm 2 / g are preferred. Is less than 2000 cm 2 / g may bleeding is likely to occur, there is a fear that fluidity is deteriorated exceeds 6000 cm 2 / g.
The content of (C) hain in the present grout composition is 0.3 to 2.0 parts by mass with respect to 100 parts by mass of cement. If it is less than 0.3 parts by mass, the effect of rapid hardening is small and bleeding may occur. If it exceeds 2.0 parts by mass, the fluidity may decrease. Preferably, it is 0.5 to 1.0 part by mass.
本発明で使用する骨材としては、特定の粒度構成とする（Ｄ）石灰石細骨材を用いることが好ましい。骨材の粒度構成について、粒度が粗い方に偏る場合は、グラウト材の粘性が下がり、流動性が良くなる一方、ブリーディングの発生や強度低下する恐れがある。また、粒度が細かい方に偏る場合は、グラウト材の粘性が上がり、グラウト組成物がより緻密な組織を形成しやすくなり、強度発現性が良くなる一方、流動性が低下し、特に低温環境下でのシマリに影響を与える恐れがある。粒径１．２ｍｍ以上２．５ｍｍ未満の骨材割合は、練上り直後の流動性ならびに施工性に影響を与える。粒径０．６ｍｍ以上１．２ｍｍ未満の骨材割合は、練上り直後の流動性に影響を与える。粒径０．３ｍｍ以上０．６ｍｍ未満および０．３ｍｍ未満の骨材割合は強度発現性に影響を与える。また、粒度構成が極端に偏る場合、グラウト材の風合いが変わる恐れがある。例えば、練り上り直後からグラウト材中の骨材が沈下気味であったり、練り混ぜ後１５分程度で流動性が低下する等である。
石灰石骨材の粒度構成は、粒径１．２ｍｍ以上２．５ｍｍ未満が２５〜４０質量％、粒径０．６ｍｍ以上１．２ｍｍ未満が２５〜４５質量％、粒径０．３ｍｍ以上０．６ｍｍ未満が２０〜３５質量％、粒径０．３ｍｍ未満が１０〜３５質量％が好ましい。また、粒径０．３ｍｍ未満の石灰石骨材は、粒径０．０９ｍｍ以上であるとより好ましい。
As the aggregate used in the present invention, it is preferable to use (D) limestone fine aggregate having a specific grain size constitution. Regarding the particle size composition of the aggregate, if the particle size is biased toward the coarser side, the viscosity of the grout material is lowered and the fluidity is improved, but on the other hand, bleeding may occur or the strength may be lowered. Further, when the particle size is biased toward the finer side, the viscosity of the grout material is increased, the grout composition is more likely to form a denser structure, and the strength development is improved, while the fluidity is reduced, especially in a low temperature environment. May affect the summary in. The proportion of aggregate having a particle size of 1.2 mm or more and less than 2.5 mm affects the fluidity and workability immediately after kneading. The proportion of aggregate having a particle size of 0.6 mm or more and less than 1.2 mm affects the fluidity immediately after kneading. The proportion of aggregates having a particle size of 0.3 mm or more and less than 0.6 mm and less than 0.3 mm affects strength development. Further, when the grain size composition is extremely biased, the texture of the grout material may change. For example, the aggregate in the grout material tends to sink immediately after kneading, or the fluidity decreases about 15 minutes after kneading.
The particle size composition of the limestone aggregate is 25 to 40% by mass for a particle size of 1.2 mm to less than 2.5 mm, 25 to 45% by mass for a particle size of 0.6 mm to less than 1.2 mm, and a particle size of 0.3 mm to 0. 20-35 mass% less than 6 mm, and 10-35 mass% less than 0.3 mm of particle diameter are preferable. Further, the limestone aggregate with a particle size of less than 0.3 mm is more preferably with a particle size of 0.09 mm or more.
本発明のグラウト組成物中の石灰石骨材の含有量は、セメント１００質量部に対して、９０〜１１０質量部である。９０質量部未満では、流動性が低下する恐れがあり、１１０質量部を超えるとブリーディングの発生や低温環境下での強度が低下する恐れがある。好ましくは、９５〜１０５質量部である。 The content of limestone aggregate in the grout composition of the present invention is 90 to 110 parts by mass with respect to 100 parts by mass of cement. If it is less than 90 parts by mass, the fluidity may decrease, and if it exceeds 110 parts by mass, bleeding may occur or the strength in a low temperature environment may decrease. It is preferably 95 to 105 parts by mass.
本発明においては、強度発現性を促進させるために（Ｅ）促進剤を含有するのが好ましい。（Ｅ）促進剤として、例えば、アルカリ金属の硫酸塩、炭酸塩、炭酸水素塩、硝酸塩、亜硫酸塩又は水酸化物等が挙げられる。その中でも、硫酸ナトリウムがコスト面または効果の面から好ましい。
（Ｅ）促進剤の含有量は、強度発現性及び長期強度の伸びの点から、セメント１００質量部に対して、０．１〜０．３質量部が好ましい。より好ましくは、０．１５〜０．２５質量部である。
In the present invention, it is preferable to contain the (E) accelerator in order to promote strength development. Examples of the (E) accelerator include alkali metal sulfates, carbonates, hydrogen carbonates, nitrates, sulfites or hydroxides. Among them, sodium sulfate is preferable from the viewpoint of cost or effect.
The content of the (E) accelerator is preferably 0.1 to 0.3 parts by mass with respect to 100 parts by mass of cement from the viewpoint of strength development and elongation of long-term strength. More preferably, it is 0.15-0.25 part by mass.
本発明グラウト組成物における練混ぜ水量は、特に限定されるものではないが、流動性の確保、及びブリーデング防止や低温環境下での強度保持の点から、水／セメント比（含有質量比率）で３２〜４０％が好ましい。より好ましくは、３４〜３６％である。 The amount of water to be mixed in the grout composition of the present invention is not particularly limited, but from the viewpoint of securing fluidity, preventing bleeding and maintaining strength under low temperature environment, water / cement ratio (content mass ratio) Is preferably 32 to 40%. More preferably, it is 34 to 36%.
本発明では、打設したモルタルの乾燥収縮を補償し、ひび割れの発生を抑制する目的で膨張材を含有させることができる。
本発明で使用する膨張材としては、水和反応により、水酸化カルシウムを生成するものが好ましく、例えば、生石灰系膨張材等が挙げられる。
膨張材の含有量は、適性な膨張性状を得る点、及び膨張量が大きくなりすぎ、硬化体の破壊を防止する点から、セメント１００質量部に対して、３〜６質量部が好ましい。より好ましくは、３．５〜５．５質量部である。
In the present invention, an expansive material can be contained for the purpose of compensating the drying shrinkage of the cast mortar and suppressing the generation of cracks.
The expansive material used in the present invention is preferably one that produces calcium hydroxide by a hydration reaction, and examples thereof include quicklime expansive material.
The content of the expansive material is preferably 3 to 6 parts by mass with respect to 100 parts by mass of cement from the viewpoint of obtaining an appropriate expansive property and preventing the destruction of the hardened body due to an excessively large expansion amount. More preferably, it is 3.5 to 5.5 parts by mass.
本発明では、グラウトモルタルの沈下現象を防止し、既設の壁や柱等の部材ならびに新規に設置する部材を一体化するために（Ｇ）発泡剤を含有させることができる。
（Ｇ）発泡剤としては、特に限定されず、例えば、アルミニウムや亜鉛等の両性金属の粉末や粉末状過酸化物質等が挙げられる。その中でも、アルミニウム粉末は効果的に発泡するため、好ましい。
発泡剤の含有量は、良好な発泡効果を得る点及び強度低下防止の点から、セメント１００質量部に対して、０．０００５〜０．００２質量部が好ましい。より好ましくは、０．００１〜０．００１５質量部である。
In the present invention, (G) a foaming agent can be contained in order to prevent the subsidence phenomenon of grout mortar and to integrate existing members such as walls and columns and newly installed members.
The foaming agent (G) is not particularly limited, and examples thereof include powders of amphoteric metals such as aluminum and zinc and powdery peroxide substances. Among them, aluminum powder is preferable because it effectively foams.
The content of the foaming agent is preferably 0.0005 to 0.002 parts by mass with respect to 100 parts by mass of cement, from the viewpoint of obtaining a good foaming effect and the prevention of strength reduction. More preferably, it is 0.001 to 0.0015 parts by mass.
また本発明ではさらに、増粘剤、セメント用ポリマー、消泡剤、防水材、防錆剤、収縮低減剤、保水剤、顔料、繊維、撥水剤、白華防止剤、急結剤、急硬剤、凝結遅延剤、空気連行剤、表面硬化剤、高炉スラグ粉末等のスラグ粉末、シリカヒュームやフライアッシュ等のポゾラン等のうち１種または２種以上を本発明の目的を実質的に阻害しない範囲で使用することが可能である。 Further, in the present invention, further, a thickener, a polymer for cement, a defoaming agent, a waterproof material, a rust preventive, a shrinkage reducing agent, a water retention agent, a pigment, a fiber, a water repellent, an anti-whitening agent, a quick-setting agent, a quick-setting agent, Hardening agent, setting retarder, air entraining agent, surface hardening agent, slag powder such as blast furnace slag powder, pozzolan such as silica fume and fly ash, etc., or one or more kinds thereof are substantially inhibited from the object of the present invention. It is possible to use it in a range where it does not.
本発明のグラウト組成物の製造方法や製造で使用する混練器具・装置等は特に限定されない。例えば混練装置としてミキサを使用し、上記各成分を所定割合で混練することで、大量のグラウト組成物を容易に作製することができる。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、グラウトミキサ、オムニミキサ、ハンドミキサ、左官ミキサ等が挙げられる。 The method for producing the grout composition of the present invention and the kneading tools and devices used in the production are not particularly limited. For example, a large amount of grout composition can be easily produced by using a mixer as a kneading device and kneading the above-mentioned components at a predetermined ratio. The mixer may be a continuous mixer or a batch mixer, and examples thereof include a grout mixer, an omni mixer, a hand mixer, and a plasterer mixer.
以下、本発明の実施例に基づいて、本発明をさらに説明するが、本発明はこれらに限定されるものではない。使用材料を表１に示す。 Hereinafter, the present invention will be further described based on Examples of the present invention, but the present invention is not limited thereto. The materials used are shown in Table 1.
石灰石骨材および珪砂について、篩い分けし、以下の粒度構成となるように再混合した。石灰石骨材の粒度構成（Ｓ１〜Ｓ８）を表２に示す。また、珪砂（Ｓ９）はＳ１の粒度構成と同様になるように調整した。 The limestone aggregate and silica sand were sieved and remixed so as to have the following particle size composition. Table 2 shows the particle size composition (S1 to S8) of the limestone aggregate. Further, silica sand (S9) was adjusted to have the same particle size composition as S1.
［実施例１］
［配合設計］
セメント１００質量部に対して、減水剤、アウイン、，細骨材を表３となるように配合設計した。また、セメント１００質量部に対して、促進剤（ＮＳ）０．２質量部，消泡剤０．０１質量部、増粘剤０．００１質量部を添加した。但し、セメントは普通ポルトランドセメントおよび早強ポルトランドセメントを５０：５０の割合で混合したものとした。
表３より、１−１〜１−２０にＣＳＡ１、１−２１にＣＳＡ２、１−２２にＣＳＡ３を用いた。
[Example 1]
[Blend design]
A water reducing agent, a hain, and a fine aggregate were mixed and designed in Table 3 with respect to 100 parts by mass of cement. Further, with respect to 100 parts by mass of cement, 0.2 parts by mass of an accelerator (NS), 0.01 part by mass of a defoaming agent, and 0.001 part by mass of a thickener were added. However, the cement was a mixture of normal Portland cement and early strength Portland cement at a ratio of 50:50.
From Table 3, CSA1 was used for 1-1 to 1-20, CSA2 was used for 1-21, and CSA3 was used for 1-22.
［グラウト作製］
２０℃環境下において、水／セメント比３５％となるように調整した水を１０Ｌの円筒容器に添加し、表３で配合設計したグラウト組成物６０００ｇを添加し、高速ハンドミキサで６０秒練混し、グラウトを作製した。また、５℃環境下において、水／セメント比３８．５％となるように調整し、グラウトを作製した。
[Grout production]
In a 20 ° C. environment, water adjusted to a water / cement ratio of 35% was added to a 10 L cylindrical container, 6000 g of the grout composition formulated in Table 3 was added, and the mixture was kneaded with a high-speed hand mixer for 60 seconds. Then, grout was prepared. Further, in a 5 ° C. environment, the water / cement ratio was adjusted to be 38.5% to prepare grout.
［評価方法］
・流動性
ＪＳＣＥ−Ｆ ５４１−２０１０「充てんモルタルの流動性試験方法（案）」に準じて、Ｊ14流下値を、５および２０℃環境下で測定した。なお、Ｊ14流下値の良好さの目安として６〜１０秒であることとする。
・ブリーディング率
ＪＩＳ Ａ １１２３「コンクリートのブリーディング試験方法」に準じて、２０℃環境下でブリーディング率を測定した。
・圧縮強度
土木学会基準ＪＳＣＥ−Ｇ ５０５−２０１０「円柱供試体を用いたモルタルまたはセメントペーストの圧縮強度試験方法（案）」に準じて、材齢２８日における圧縮強度を測定した。供試体の寸法は、直径５０ｍｍ、高さ１００ｍｍとした。また、養生は、５および２０℃の恒温槽内で、翌日に脱型し、その後、材齢日まで標準養生した。
[Evaluation methods]
-Fluidity According to JSCE-F541-2010 "Fluidity test method for filled mortar (plan)", the J 14 downflow value was measured under 5 and 20 ° C environments. It should be noted that it is 6 to 10 seconds as a guide for the goodness of the J 14 flow-down value.
-Bleeding rate According to JIS A 1123 "Concrete bleeding test method", the bleeding rate was measured in an environment of 20 ° C.
-Compressive strength The compressive strength at 28 days of age was measured according to JSCE-G 505-2010 "Compressive strength test method for mortar or cement paste using cylindrical specimen (plan)". The dimensions of the specimen were 50 mm in diameter and 100 mm in height. Further, the curing was carried out in the constant temperature bath of 5 and 20 ° C. on the next day, after which the mold was removed, and then standard curing was performed until the age of the material.
［実施例２］
［配合設計］
セメント１００質量部に対して表１の使用材料を用い表５となるように配合設計した。また、それ以外の使用材料をセメント１００質量部に対して、減水剤０．８質量部，アウイン０．７質量部、細骨材（Ｓ１）１００質量部、消泡剤０．０１質量部、増粘剤０．００１質量部となるようにした。但し、セメントは普通ポルトランドセメントおよび早強ポルトランドセメントを５０：５０の割合で混合したものとした。
[Example 2]
[Blend design]
A blending design was made by using the materials used in Table 1 with respect to 100 parts by mass of cement so as to obtain Table 5. In addition, the other materials used are 100 parts by mass of cement, 0.8 parts by mass of water reducing agent, 0.7 parts by mass of ain, 100 parts by mass of fine aggregate (S1), 0.01 parts by mass of defoaming agent, The thickener was adjusted to 0.001 part by mass. However, the cement was a mixture of normal Portland cement and early strength Portland cement at a ratio of 50:50.
［グラウト作製］
２０℃環境下において、水／セメント比が３３〜３７％となるように調整した水を１０Ｌの円筒容器に添加し、表５で配合設計したグラウト組成物６０００ｇを添加し、高速ハンドミキサで６０秒練混し、グラウトを作製した。
［評価方法］
[Grout production]
In a 20 ° C. environment, water adjusted to have a water / cement ratio of 33 to 37% was added to a 10 L cylindrical container, 6000 g of the grout composition formulated in Table 5 was added, and the mixture was mixed with a high-speed hand mixer at 60 ° C. Second kneading was performed to prepare grout.
[Evaluation methods]
流動性、ブリーディング率および圧縮強度について、実施例１と同様の評価方法により評価した。但し、２０℃環境下での測定を実施した。
＜体積膨張率＞
ＪＳＣＥ−Ｆ ５３３−１９９９「ＰＣグラウトのブリーディング率および膨張率試験方法」の膨張率試験方法により、２０℃環境下で材齢７日の体積膨張率を測定した。但し、試験器への型詰めは練り上り直後のモルタルを充填し基長した。
なお、Ｎｏ．１−１、２−５および２−６について測定を実施した。
The fluidity, the bleeding rate, and the compressive strength were evaluated by the same evaluation methods as in Example 1. However, the measurement was carried out in an environment of 20 ° C.
<Volume expansion coefficient>
According to the expansion coefficient test method of JSCE-F 533-1999 “PC grouting bleeding coefficient and expansion coefficient test method”, the volume expansion coefficient was measured at a temperature of 7 days in a 20 ° C. environment. However, the mold was packed in the tester by filling with mortar immediately after kneading and having a base length.
In addition, No. The measurement was performed on 1-1, 2-5, and 2-6.
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