JP2010100457A - Grout composition for use at elevated temperature - Google Patents
Grout composition for use at elevated temperature Download PDFInfo
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- JP2010100457A JP2010100457A JP2008271479A JP2008271479A JP2010100457A JP 2010100457 A JP2010100457 A JP 2010100457A JP 2008271479 A JP2008271479 A JP 2008271479A JP 2008271479 A JP2008271479 A JP 2008271479A JP 2010100457 A JP2010100457 A JP 2010100457A
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- reducing agent
- grout composition
- water reducing
- polycarboxylic acid
- cement
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- 239000000203 mixture Substances 0.000 title claims abstract description 73
- 239000011440 grout Substances 0.000 title claims abstract description 72
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 67
- 239000000463 material Substances 0.000 claims abstract description 46
- 239000002253 acid Substances 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 34
- 239000002562 thickening agent Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 86
- 239000011398 Portland cement Substances 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 2
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- 238000004898 kneading Methods 0.000 description 22
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- 239000003795 chemical substances by application Substances 0.000 description 5
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- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 2
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- 229920005610 lignin Polymers 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002940 repellent Effects 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920002498 Beta-glucan Polymers 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920001218 Pullulan Polymers 0.000 description 1
- 239000004373 Pullulan Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229920002310 Welan gum Polymers 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
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- 239000002956 ash Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
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- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
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- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 229920000642 polymer Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
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- 150000004804 polysaccharides Chemical class 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、高温用グラウト組成物に関し、詳しくは、混練したグラウト組成物の材料温度が40℃以上の高温の場合においても、30分以上の可使時間があり、かつ流動性に優れた高温用グラウト組成物に関する。 The present invention relates to a high-temperature grout composition, and more specifically, even when the material temperature of the kneaded grout composition is a high temperature of 40 ° C. or higher, it has a pot life of 30 minutes or more and is excellent in fluidity. The invention relates to a grout composition.
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、トンネルの履行背面と地山との間の空隙、鉄筋スリープ内の空隙、逆打ち工法における空隙、構造物の補修及び補強、ロックアンカー及びアースアンカー、橋梁支承及び機械のベースプレート下、軌道庄板下などへ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、各種のグラウト材が開発されている(例えば特許文献1及び特許文献2参照)。 In civil engineering and construction work, fine gaps in concrete structures, gaps between the back of the tunnel and the ground, gaps in the rebar sleep, gaps in the reverse driving method, repair and reinforcement of structures, rock anchors and earth anchors In addition, grouting work for filling mortar and cement paste under the base plate of the bridge support and the machine, under the track rack, etc. has been carried out, and various grouting materials have been developed (see, for example, Patent Document 1 and Patent Document 2). .
一般に、グラウト材の練り上がり温度が30℃以上となるような高温の場合、練り上がり後流動性を失うことが早いことが知られている。そこで、夏場等で材料温度が30℃を超えるような使用条件においてもフローダウンの少ないセメント組成物が提案されている(例えば特許文献3参照)。また、30℃を超える高温下での流動性の経時変化を防止するセメント分散剤も提案されている(例えば特許文献4参照)。
しかしながら、混練したグラウト組成物の材料温度が40℃以上と高温の場合においては、20〜30℃程度の場合と比べて経時による混練したグラウト組成物の流動性の低下がより大きくなる。流動性の低下が大きい場合は施工不可能ということにもつながることから大きな問題となる。 However, in the case where the material temperature of the kneaded grout composition is as high as 40 ° C. or higher, the fluidity of the kneaded grout composition is more greatly lowered over time than in the case of about 20 to 30 ° C. If the decrease in fluidity is large, it will lead to the fact that construction is impossible.
本発明は、混練したグラウト組成物の材料温度が40℃以上の高温の場合においても30分以上の可使時間をもち、優れた流動性を備えた高温用グラウト組成物を提供することを目的とする。 An object of the present invention is to provide a high temperature grout composition having a pot life of 30 minutes or more and excellent fluidity even when the material temperature of the kneaded grout composition is a high temperature of 40 ° C. or higher. And
そこで本発明者は、40℃以上の高温条件下での流動性の経時変化と配合成分との関係について検討したところ、セメントに加えて、全く意外にもポリカルボン酸系減水剤、特に短時間で流動性を消失させる短時間型ポリカルボン酸系減水剤と増粘剤とを併用すれば、40℃以上の高温の場合においても30分以上の可使時間を有し、優れた流動性を備えたグラウト組成物が得られることを見出した。 Therefore, the present inventor examined the relationship between the change over time in fluidity under high temperature conditions of 40 ° C. or higher and the blended components. In addition to cement, it was quite surprising that polycarboxylic acid-based water reducing agents, particularly for a short time, were used. In combination with a short-time polycarboxylic acid-based water reducing agent that loses fluidity and a thickener, it has a pot life of 30 minutes or more even at a high temperature of 40 ° C. or higher, and has excellent fluidity. It has been found that a grout composition provided is obtained.
すなわち、本発明は、セメント、増粘剤及びポリカルボン酸系減水剤を含有する高温用グラウト組成物を提供するものである。 That is, this invention provides the grout composition for high temperature containing a cement, a thickener, and a polycarboxylic acid-type water reducing agent.
本発明によれば、混練したグラウト組成物の材料温度が40℃以上と高温の場合においても30分以上の可使時間をもち、優れた流動性を備えた高温用グラウト組成物が得られる。また、硬化後の圧縮強度が材齢28日で90N/mm2以上と高い、高温用グラウト組成物が提供される。 According to the present invention, even when the material temperature of the kneaded grout composition is as high as 40 ° C. or higher, a high-temperature grout composition having a pot life of 30 minutes or more and excellent fluidity can be obtained. Moreover, the grout composition for high temperature whose compressive strength after hardening is as high as 90 N / mm < 2 > or more at the age of 28 days is provided.
本発明は、セメント、増粘剤及びポリカルボン酸系減水剤を含有する高温用グラウト組成物である。
通常、グラウト組成物には、減水剤としてポリカルボン酸系減水剤の他に、ナフタレンスルホン酸系減水剤、メラミンスルホン酸系減水剤、リグニンスルホン酸系減水剤等が用いられるが、本発明者の検討の結果、高温条件下では、これらポリカルボン酸系減水剤以外の減水剤では良好な流動性が得られず、高温グラウト組成物においてはポリカルボン酸系減水剤のみが良好な流動性を示すことが判明した。ポリカルボン酸系減水剤には、高性能減水剤、高性能AE減水剤、AE減水剤及び流動化剤が含まれる。
The present invention is a high temperature grout composition containing cement, a thickener and a polycarboxylic acid water reducing agent.
Usually, in the grout composition, a naphthalene sulfonic acid-based water reducing agent, a melamine sulfonic acid-based water reducing agent, a lignin sulfonic acid-based water reducing agent and the like are used as a water reducing agent in addition to a polycarboxylic acid-based water reducing agent. As a result of the examination of the above, under high temperature conditions, water reducing agents other than these polycarboxylic acid-based water reducing agents cannot obtain good fluidity, and in high-temperature grout compositions, only polycarboxylic acid-based water reducing agents have good fluidity. Turned out to show. The polycarboxylic acid water reducing agent includes a high performance water reducing agent, a high performance AE water reducing agent, an AE water reducing agent, and a fluidizing agent.
ポリカルボン酸系減水剤としては、ポリアクリル酸、ポリメタクリル酸、ポリオキシアルキレン修飾ポリアクリル酸及びポリオキシアルキレン修飾ポリメタクリル酸から選ばれる構成単位を有する減水剤が好ましい。 As the polycarboxylic acid-based water reducing agent, a water reducing agent having a structural unit selected from polyacrylic acid, polymethacrylic acid, polyoxyalkylene modified polyacrylic acid and polyoxyalkylene modified polymethacrylic acid is preferable.
ポリカルボン酸系減水剤が、短時間型ポリカルボン酸系減水剤を含有するものであるのが特に好ましい。本発明において、短時間型ポリカルボン酸系減水剤とは、60℃に調整した、普通ポルトランドセメント4000g、水1216g及び当該減水剤4gを、内径180mm、深さ210mmの金属性容器内に全材料投入後に、回転数1000r.p.m.,羽根直径100mmのハンドミキサで120秒間練り混ぜた直後にJIS R 5201「セメントの物理試験方法」11.フロー試験に準じてフローコーンに混練したセメントペーストを流し込んだ後にフローコーンを取り去り落下運動を行わずにフロー値(以下、「JIS静置フロー値」という。)を測定することができるが、その後、グラウトを内径130mm,深さ200mmのポリ容器に移し変え、60℃で静置し、注水から30分間後のJIS静置フロー値が、流動性がないために測定できないポリカルボン酸系減水剤をいう。また、本発明において長時間型ポリカルボン酸系減水剤とは、同様の試験により、混練直後も注水から30分後もJIS静置フロー値が測定できる、即ち流動性があるポリカルボン酸系減水剤をいう。注水から30分後のJIS静置フロー値測定前はハンドミキサで10秒攪拌した。 It is particularly preferable that the polycarboxylic acid-based water reducing agent contains a short-time polycarboxylic acid-based water reducing agent. In the present invention, the short-time polycarboxylic acid-based water reducing agent is a mixture of all ordinary materials in a metallic container having an inner diameter of 180 mm and a depth of 210 mm. After charging, the rotational speed is 1000 r. p. m. Immediately after kneading with a hand mixer having a blade diameter of 100 mm for 120 seconds, JIS R 5201 “Cement physical test method” 11. After pouring the cement paste kneaded into the flow cone according to the flow test, the flow value can be measured without removing the flow cone and performing the falling motion (hereinafter referred to as “JIS static flow value”). , Transfer the grout to a plastic container with an inner diameter of 130 mm and a depth of 200 mm, leave at 60 ° C., and the JIS static flow value after 30 minutes from pouring cannot be measured due to lack of fluidity. Say. Further, in the present invention, the long-term polycarboxylic acid-based water reducing agent is a polycarboxylic acid-based water reducing agent that can measure the JIS static flow value immediately after kneading and after 30 minutes of water injection, that is, fluidity. An agent. The mixture was stirred for 10 seconds with a hand mixer before measurement of the JIS static flow value 30 minutes after injection.
本発明に使用する減水剤の種類としては、高性能減水剤又は高性能AE減水剤が、高い強度が得られることから望ましい。また、本発明で使用されるポリカルボン酸系減水剤は、粉末状でも水溶液状でも使用可能であるが、施工現場で複雑な計量操作等を必要とせずに、所定量の水を計量し混練するだけですぐに使用できるように、本発明の高温用グラウト組成物が配合成分のすべてが予め混合され粉末状である所謂「プレミックス製品」であるほうが施工現場での作業性が良い為、使用するポリカルボン酸系減水剤自体も粉末状であることが好ましい。 As a kind of water reducing agent used in the present invention, a high performance water reducing agent or a high performance AE water reducing agent is desirable because high strength is obtained. The polycarboxylic acid-based water reducing agent used in the present invention can be used in the form of powder or aqueous solution, but a predetermined amount of water is measured and kneaded without requiring a complicated measuring operation at the construction site. Since the grout composition for high temperature of the present invention is a so-called “premix product” in which all of the ingredients are premixed and powdered so that it can be used immediately, the workability at the construction site is better. It is preferable that the polycarboxylic acid-based water reducing agent used is also in a powder form.
本発明の高温用グラウト組成物におけるポリカルボン酸系減水剤の含有量は、0.1重量%〜1.0重量%とすることが望ましい。0.1重量%未満では減水剤を含有させる効果が低く可使時間即ち流動性を有する時間が短過ぎる虞があり、1.0重量%を超えると過剰添加によって材料分離が生じる虞がある。可使時間を長くでき且つ材料分離が生じる虞が小さいことから、より好ましくは、0.15重量%〜0.4重量%、もっとも好ましくは、0.25重量%〜0.35重量%とする。 The content of the polycarboxylic acid-based water reducing agent in the high temperature grout composition of the present invention is desirably 0.1% by weight to 1.0% by weight. If it is less than 0.1% by weight, the effect of containing a water reducing agent is low, and the pot life, that is, the time for having fluidity may be too short. If it exceeds 1.0% by weight, material separation may occur due to excessive addition. Since the pot life can be increased and the possibility of material separation is small, it is more preferably 0.15 wt% to 0.4 wt%, and most preferably 0.25 wt% to 0.35 wt%. .
本発明に使用するポリカルボン酸系減水剤は二種類以上を併用することが可能である。しかし、長時間型ポリカルボン酸系減水剤のみの場合はブリーディング量が多くなるので、本発明においては、短時間型ポリカルボン酸系減水剤を一種類又は二種類以上含有することが、ブリーディングを少なくすることができることから好ましい。 Two or more kinds of polycarboxylic acid-based water reducing agents used in the present invention can be used in combination. However, since the amount of bleeding increases only in the case of the long-time type polycarboxylic acid-based water reducing agent, in the present invention, it is possible to contain one or more types of short-time type polycarboxylic acid-based water reducing agents. This is preferable because it can be reduced.
本発明で使用するセメントとしては、水硬性セメントであれば使用でき、例えばポルトランドセメント、アルミナセメント、混合セメント等から選ばれる1種又は2種以上を用いることができるが、ブレーン比表面積が3600g/cm2以上のポルトランドセメントを使用することが、ブリーディングの発生を抑制できることから望ましい。ブレーン比表面積が3600g/cm2以下の場合は、ブリーディングが発生する虞が高い。より好ましくは、ブレーン比表面積が3600g/cm2〜10000g/cm2のポルトランドセメントを使用することが、ブリーディングの発生を抑制でき且つ可使時間が長くできることから好ましい。 As the cement used in the present invention, any hydraulic cement can be used. For example, one or more selected from Portland cement, alumina cement, mixed cement and the like can be used. It is desirable to use a Portland cement of cm 2 or more because generation of bleeding can be suppressed. When the specific surface area of the brain is 3600 g / cm 2 or less, there is a high possibility that bleeding occurs. More preferably, it is preferable to use a Portland cement having a specific surface area of 3600 g / cm 2 to 10000 g / cm 2 because the generation of bleeding can be suppressed and the pot life can be increased.
本発明の高温用グラウト組成物におけるセメントの含有量は、本発明の高温用グラウト組成物が骨材を含有しない場合は、85.0重量%〜99.5重量%とすることが望ましい。セメントの含有量が少なすぎると圧縮強度が低くなる虞があり、多すぎるとセメント以外の構成材料が不足するので可使時間が不充分となる虞がある。また、本発明の高温用グラウト組成物が骨材を含有する場合のセメントの含有率は、同様の理由で、45重量%〜90重量%とすることが望ましい。 The cement content in the high temperature grout composition of the present invention is desirably 85.0 wt% to 99.5 wt% when the high temperature grout composition of the present invention contains no aggregate. If the cement content is too small, the compressive strength may be lowered. If the cement content is too large, constituent materials other than cement may be insufficient, and the pot life may be insufficient. Moreover, when the high temperature grout composition of this invention contains an aggregate, it is desirable to set it as 45 to 90 weight% for the same reason.
本発明で使用する増粘剤としては、例えばヒドロキシメチルセルロースやヒドロキシプロピ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等が挙げられ、これらの一種又は二種以上の使用が可能であるが、凝結遅延の影響があまりない程度の少量で、材料分離することなく高い流動性が得やすいことから、水溶性セルロースが好ましい。 Examples of the thickener used in the present invention include water-soluble cellulose such as hydroxymethyl cellulose and hydroxypropyl cellulose; polysaccharides such as alginic acid, β-1,3 glucan, pullulan and welan gum; polyvinyl compounds such as acrylic resin and polyvinyl alcohol. It is possible to use one or more of these, but it is easy to obtain high fluidity without material separation in a small amount that does not have much influence of setting delay. preferable.
本発明の高温用グラウト組成物における増粘剤の含有率は、0.01重量%〜0.1重量%とすることが好ましい。増粘剤の含有量が少なすぎると、増粘剤を含有させる効果が低く、増粘剤の含有率が多くなると粘性が増加して流動性の低下を招く虞があることから、増粘剤のより好ましい含有率は、0.03重量%〜0.06重量%である。 The content of the thickener in the high temperature grout composition of the present invention is preferably 0.01% by weight to 0.1% by weight. If the content of the thickener is too small, the effect of containing the thickener is low, and if the content of the thickener is increased, the viscosity may increase and the fluidity may be lowered. The more preferable content of is 0.03% by weight to 0.06% by weight.
本発明の高温用グラウト組成物には、ブリーディングの発生を抑制するために膨張材を含有することが好ましい。特に、本発明の超高温用グラウト組成物に骨材を用いない場合は、骨材を含有するものに比べて硬化時及び乾燥時の収縮が大きいので、収縮を抑制するためにも膨張材を用いることが好ましい。 The grout composition for high temperature of the present invention preferably contains an expansion material in order to suppress bleeding. In particular, when an aggregate is not used in the ultra high temperature grout composition of the present invention, the shrinkage at the time of curing and drying is larger than that containing the aggregate. It is preferable to use it.
本発明に用いられる膨張材としては、モルタルやコンクリートで用いられる膨張材であれば特に限定されず、例えば遊離生石灰を膨張成分とするものや、カルシウムサルホアルミネート等のエトリンガイト形成物質を膨張成分とする市販品を使用することができる。膨張材の含有量は0.1重量%〜1.0重量%とすることが好ましい。膨張材の含有量が少ないとその効果が不充分である場合があり、また、多すぎると充分に拘束されたまま養生されないと目的の強度が得られなくなる場合がある。 The expansion material used in the present invention is not particularly limited as long as it is an expansion material used in mortar or concrete, for example, those containing free quick lime as an expansion component, and ettringite-forming substances such as calcium sulfoaluminate as the expansion component. Commercial products can be used. The content of the expansion material is preferably 0.1% by weight to 1.0% by weight. If the content of the expandable material is small, the effect may be insufficient. If the content is too large, the desired strength may not be obtained unless the material is cured sufficiently.
本発明の高温用グラウト組成物には、セメント、増粘剤、ポリカルボン酸系減水剤及び膨張材以外に、上記以外の混和材料の一種又は二種以上を本発明の効果を損なわない範囲で使用することができる。この混和材料としては、例えばセメント用ポリマー、発泡剤、起泡材、防水材、防錆材、収縮低減剤、保水剤、顔料、繊維、撥水剤、白華防止剤、急結剤(材)、急硬材(材)、凝結遅延剤、水和熱抑制剤、消泡剤、高炉スラグ微粉末、フライアッシュ、石粉、シリカフューム、火山灰、撥水剤、表面硬化剤等が挙げられる。 In the grout composition for high temperature of the present invention, in addition to cement, thickener, polycarboxylic acid-based water reducing agent, and expanding material, one or more admixtures other than those described above are included within a range not impairing the effects of the present invention. Can be used. Examples of such admixtures include polymers for cement, foaming agents, foaming materials, waterproofing materials, rust-proofing materials, shrinkage reducing agents, water retention agents, pigments, fibers, water repellents, whitening prevention agents, and quick setting agents (materials). ), Rapid hardening material (material), setting retarder, hydration heat inhibitor, antifoaming agent, fine powder of blast furnace slag, fly ash, stone powder, silica fume, volcanic ash, water repellent, surface hardener and the like.
本発明の高温用グラウト組成物に、モルタルやコンクリートで使用可能な細骨材及び粗骨材の一種又は二種以上を本発明の効果を損なわない範囲で使用することも可能である。 In the grout composition for high temperature of the present invention, one or more fine aggregates and coarse aggregates that can be used in mortar and concrete can be used as long as the effects of the present invention are not impaired.
本発明の高温用グラウト組成物を製造する方法は、特に限定されず、例えば、重力式コンクリートミキサ、ヘンシェル式ミキサ、ナウターミキサ、レーディゲミキサ、V型混合器、リボンミキサ等のミキサを使用し、所定量の本発明の高温用グラウト組成物の各材料を混合することで製造することができる。このとき用いるミキサは、連続式ミキサでもバッチ式ミキサでも良い。各材料のミキサ内への投入順序は特に限定されない。一種ずつ添加してもよく、一部又は全部を同時添加してもよい。また、袋やポリエチレン製容器等の容器に各材料を計り取り投入する方法により、本発明の高温用グラウト組成物を製造することもできる。 The method for producing the high-temperature grout composition of the present invention is not particularly limited. For example, a predetermined amount is used using a mixer such as a gravity concrete mixer, a Henschel mixer, a Nauter mixer, a Roedige mixer, a V-type mixer, or a ribbon mixer. It can manufacture by mixing each material of the high temperature grout composition of this invention. The mixer used at this time may be a continuous mixer or a batch mixer. The order in which each material is charged into the mixer is not particularly limited. They may be added one by one, or some or all of them may be added simultaneously. Moreover, the grout composition for high temperature of this invention can also be manufactured by the method of measuring and throwing each material into containers, such as a bag and a polyethylene container.
本発明の高温用グラウト組成物は、水を混練に用いる。混練する方法は特に限定されず、例えば水に本発明の高温用グラウト組成物を全量加え混練する方法、水に本発明の高温用グラウト組成物を混練しながら加えさらに混練する方法、本発明の高温用グラウト組成物に水を混練しながら加えさらに混練する方法、水及び本発明の高温用グラウト組成物のそれぞれ一部ずつを2つ以上に分けて混練し、混練したものを合わせてさらに混練する方法等がある。また、混練に用いる器具や混練装置も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。 The high temperature grout composition of the present invention uses water for kneading. The method of kneading is not particularly limited. For example, the method of adding and kneading the entire amount of the high temperature grout composition of the present invention to water, the method of adding and kneading the high temperature grout composition of the present invention to water while mixing, A method in which water is added to the high temperature grout composition while kneading and further kneading, water and a part of each of the high temperature grout compositions of the present invention are kneaded in two or more, and the kneaded ones are further kneaded. There are ways to do this. Moreover, although the apparatus and kneading apparatus used for kneading are not particularly limited, 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, and examples thereof include a pan type concrete mixer, a pug mill type concrete mixer, a gravity type concrete mixer, a grout mixer, a hand mixer, and a plastering mixer.
使用する水は、特に限定されるものではない。混和材料に含まれる水を用いてもよい。用いる水の量は、本発明の高温用グラウト組成物に骨材が含まれない場合は、本発明の高温用グラウト組成物100重量部に対し、25重量部〜40重量部が好ましく、28重量部〜36重量部がさらに好ましい。25重量部未満では流動性が得られにくく、40重量部を超えると材料分離によりブリーディングが発生する虞や強度が低下する虞がある。
また、本発明の高温用グラウト組成物が骨材を含有する場合に用いる水の量は、本発明の高温用グラウト組成物100重量部に対し、15重量部〜25重量部であると、ブリーディングが少なく且つ硬化後の圧縮強度が材齢28日で90N/mm2以上と高くなることから好ましい。
また、セメント100重量部に対し25重量部〜40重量部とすると、土木学会基準JSCE−F 541「充填モルタルの流動性試験方法」に規定されるフロータイム(J14漏斗流下時間)が4秒〜8秒の高い流動性が得られ且つ硬化後の圧縮強度が材齢28日で90N/mm2以上と高いことから好ましい。
The water to be used is not particularly limited. You may use the water contained in an admixture. When the aggregate is not contained in the high temperature grout composition of the present invention, the amount of water used is preferably 25 parts by weight to 40 parts by weight with respect to 100 parts by weight of the high temperature grout composition of the present invention, and 28 weights. Part to 36 parts by weight is more preferable. If it is less than 25 parts by weight, it is difficult to obtain fluidity, and if it exceeds 40 parts by weight, bleeding may occur due to material separation and the strength may be reduced.
The amount of water used when the high-temperature grout composition of the present invention contains aggregate is 15 to 25 parts by weight with respect to 100 parts by weight of the high-temperature grout composition of the present invention. And the compressive strength after curing is preferably as high as 90 N / mm 2 or more at 28 days of age.
In addition, when 100 parts by weight of cement relative to 25 to 40 parts by weight, the flow time prescribed in the Japanese Society of Civil Engineering standard JSCE-F 541 "Test Method of Flowability for Filling Mortar" (J 14 funnel flow time) is 4 seconds It is preferable because high fluidity of ˜8 seconds is obtained and the compressive strength after curing is as high as 90 N / mm 2 or more at the age of 28 days.
実施例1
ここで使用するポリカルボン酸系減水剤(減水剤A〜減水剤C)は、表1に示す3種類のポリカルボン酸系減水剤を用いた。尚、この3種類の減水剤は市販されているポリカルボン酸系減水剤である。具体的な試験方法について以下に示す。
Example 1
As the polycarboxylic acid-based water reducing agent (water reducing agent A to water reducing agent C) used here, three types of polycarboxylic acid-based water reducing agents shown in Table 1 were used. These three kinds of water reducing agents are commercially available polycarboxylic acid-based water reducing agents. Specific test methods are shown below.
表1に示す配合量の材料を60℃に調整し、内径180mm、深さ210mmの金属性容器内で全材料投入後、回転数1000r.p.m.、羽根直径100mmのハンドミキサで120秒間練り混ぜセメントペーストを作製した直後にJIS静置フロー値を測定した。測定後、作製したセメントペーストを内径130mm、深さ200mmのポリ容器に移し変え、60℃で静置し、その後、注水から30分間後のJIS静置フロー値も測定した。この30分後のJIS静置フロー値測定前にはハンドミキサでセメントペーストを10秒攪拌した。ここで、減水剤A及び減水剤Bは、注水から30分後のJIS静置フロー値が測定できない(流動性がない)短時間型ポリカルボン酸系減水剤で、減水剤Cは、同様の試験方法により30分後もJIS静置フローが測定できる(流動性がある)長時間型ポリカルボン酸系減水剤であった。 The materials having the blending amounts shown in Table 1 were adjusted to 60 ° C., and all materials were charged in a metallic container having an inner diameter of 180 mm and a depth of 210 mm. p. m. The JIS static flow value was measured immediately after preparing a cement paste for 120 seconds with a hand mixer having a blade diameter of 100 mm. After the measurement, the prepared cement paste was transferred to a plastic container having an inner diameter of 130 mm and a depth of 200 mm and left at 60 ° C., and then the JIS static flow value after 30 minutes from the water injection was also measured. The cement paste was stirred for 10 seconds with a hand mixer before JIS static flow value measurement after 30 minutes. Here, the water reducing agent A and the water reducing agent B are short-time polycarboxylic acid type water reducing agents in which the JIS static flow value after 30 minutes from the water injection cannot be measured (no fluidity), and the water reducing agent C is the same. It was a long-time polycarboxylic acid-based water reducing agent capable of measuring the JIS stationary flow even after 30 minutes by the test method (having fluidity).
実施例2
表2及び表3に示す配合割合で各水準4kgのグラウト組成物を作製した。このときの使用材料を以下に示す。グラウト組成物の作製方法は、作製するグラウト組成物の質量が4kgとなる量の表2及び表3に示す割合の各材料を、ポリ袋(縦650mm×横350mm×厚さ0.1mm)に投入し、密閉した後に60秒間手で振り、各材料を混合することでグラウト組成物を作製した。
作製したグラウト組成物100重量部に対し30.4重量部となる量の水(1.216kg)を、内径240mm,深さ245mmのステンレス製円筒容器に入れ、回転数1000r.p.m.,羽根直径100mmのハンドミキサを羽根が水に接する状態で回転させながらグラウト組成物を容器内に投入した。続けて投入完了後から120秒間ハンドミキサにより混練することでグラウトを作製した。作製したグラウトの品質試験として、以下に示す通り、J14漏斗流下時間、圧縮強度を測定し、ブリーディングの有無を確認した。但し、配合No.7の水量はグラウト組成物100重量部に対し28.5重量部となる量の水(1.140kg)とした。なお、グラウト組成物及び水の温度は60℃とし、練り混ぜ及び供試体の作成は30℃で行い、供試体の作成後、養生は60℃で行った。品質試験の結果を表4及び表5に示す。
Example 2
A grout composition having a level of 4 kg was prepared at the blending ratios shown in Tables 2 and 3. The materials used at this time are shown below. The production method of the grout composition is as follows. Each material in the ratio shown in Table 2 and Table 3 in an amount that the mass of the grout composition to be produced is 4 kg in a plastic bag (length 650 mm × width 350 mm × thickness 0.1 mm). The grout composition was produced by adding and sealing, then shaking by hand for 60 seconds and mixing the materials.
Water (1.216 kg) in an amount of 30.4 parts by weight with respect to 100 parts by weight of the produced grout composition was put in a stainless steel cylindrical container having an inner diameter of 240 mm and a depth of 245 mm, and the rotational speed was 1000 r. p. m. The grout composition was put into a container while rotating a hand mixer having a blade diameter of 100 mm while the blade was in contact with water. Next, after completion of the charging, the grout was prepared by kneading with a hand mixer for 120 seconds. As a quality test for grout produced, as shown below, J 14 funnel flow time, the compressive strength was measured to confirm the presence or absence of bleeding. However, the formulation No. The amount of water 7 was 28.5 parts by weight of water (1.140 kg) with respect to 100 parts by weight of the grout composition. In addition, the temperature of the grout composition and water was 60 ° C., kneading and preparation of specimens were performed at 30 ° C., and curing was performed at 60 ° C. after preparation of the specimens. Tables 4 and 5 show the results of the quality test.
<使用材料>
セメントA:普通ポルトランドセメント(ブレーン比表面積3300g/cm2);太平洋セメント社製
セメントD:早強ポルトランドセメント(ブレーン比表面積4400g/cm2);太平洋セメント社製
セメントB:セメントA:セメントD=7:3の質量比率で混合したもの(ブレーン比表面積3600g/cm2)
セメントC:セメントA:セメントD=5:5の質量比率で混合したもの(ブレーン比表面積3800g/cm2)
水:水道水
膨張材:石灰系膨張材(太平洋マテリアル株式会社製,ブレーン比表面積4250g/cm2)
減水剤A:短時間型ポリカルボン酸系高性能減水剤 市販品
減水剤B:短時間型ポリカルボン酸系高性能減水剤 市販品
減水剤C:長時間型ポリカルボン酸系高性能減水剤 市販品
減水剤D:メラミンスルホン酸系高性能減水剤 市販品
減水剤E:ナフタレンスルホン酸系高性能減水剤 市販品
減水剤F:リグニンスルホン酸系高性能減水剤 市販品
<Materials used>
Cement A: normal portland cement (Blaine specific surface area 3300g / cm 2); Pacific Ocean Cement Co. Cement D: early-strength Portland cement (Blaine specific surface area 4400g / cm 2); Pacific Ocean Cement Co. Cement B: Cement A: Cement D = Mixed at a mass ratio of 7: 3 (Blaine specific surface area 3600 g / cm 2 )
Cement C: Cement A: Cement D = Mixed at a mass ratio of 5: 5 (Blaine specific surface area 3800 g / cm 2 )
Water: tap water expansion material: lime-based expansion material (manufactured by Taiheiyo Material Co., Ltd., Brain specific surface area 4250 g / cm 2 )
Water reducing agent A: Short-time type polycarboxylic acid-based high-performance water reducing agent Commercial water-reducing agent B: Short-time type polycarboxylic acid-based high-performance water reducing agent Commercial water-reducing agent C: Long-time type polycarboxylic acid-based high-performance water reducing agent Commercially available Product water reducing agent D: Melamine sulfonic acid-based high-performance water reducing agent Commercial product water reducing agent E: Naphthalene sulfonic acid-based high-performance water reducing agent Commercial product water-reducing agent F: Lignin sulfonic acid-based high-performance water reducing agent
<品質試験方法>
・J14漏斗流下時間
土木学会基準JSCE−F 541「充填モルタルの流動性試験方法」に従い、J14漏斗を用いて練り混ぜ直後及び注水から30分後に流下時間を測定した。尚、30分後に測定する前は10秒間ハンドミキサで攪拌した。
・圧縮強度試験
土木学会基準JSCE−G 541「充填モルタルの圧縮強度試験方法」に準じ、材齢28日の圧縮強度を測定した。このとき供試体は、材齢1日で脱型し、その後60℃の水中で養生した。
・ブリーディングの有無
作製したグラウトを内径105mm,深さ110mmのポリ容器に入れ、ラップで密封し、60℃の乾燥機に入れ、練り混ぜ終了直後〜注水から2時間後まで目視でブリーディングの有無を確認した。ポリ容器が水平な状態でもポリ容器を静かに傾けてもブリーディングが認められないものを◎、ポリ容器が水平な状態ではブリーディングは認められないがポリ容器を静かに傾けた場合にブリーディングが少量でも認められるものは○、ポリ容器が水平な状態でもブリーディングが認められるものを×とした。
<Quality test method>
· According J 14 funnel flow time of Civil Engineering standard JSCE-F 541 "Test Method of Flowability for Filling Mortar", was measured efflux time of 30 minutes after the immediately and injection kneading using a J 14 funnel. In addition, it stirred with the hand mixer for 10 seconds before measuring after 30 minutes.
-Compressive strength test The compressive strength of the material age 28 days was measured according to JSCE-G 541 "compressive strength test method of filling mortar". At this time, the specimen was demolded at a material age of 1 day and then cured in water at 60 ° C.
・ Presence or absence of bleeding Place the prepared grout in a plastic container with an inner diameter of 105 mm and a depth of 110 mm, seal it with a wrap, put it in a dryer at 60 ° C. confirmed. Even if the plastic container is in a horizontal state, even if the plastic container is tilted gently, no bleeding is observed ◎, but if the plastic container is in a horizontal state, bleeding is not recognized, but if the plastic container is tilted gently, even if there is a small amount of bleeding The case where the bleeding was observed even when the plastic container was in a horizontal state was rated as “◯”.
本発明の実施例に相当する配合No.1〜No.7のグラウト組成物は何れも注水から30分後でも優れた流動性を備え、硬化後の圧縮強度が材齢28日で90N/mm2以上と高い硬化特性を備えていた。中でも配合No.1〜No.4のグラウト組成物はブリーディングが確認されなかったが、配合No.5〜No.7はポリ容器を静かに傾けると少量のブリーディングが確認され為、配合No.1〜No.4に比べてやや材料分離抵抗性に劣っていた。 Formulation No. corresponding to the examples of the present invention. 1-No. The grout composition of No. 7 had excellent fluidity even after 30 minutes from water injection, and had high curing properties such that the compressive strength after curing was 90 N / mm 2 or more at 28 days of age. Among them, the formulation No. 1-No. No bleeding was confirmed in the grout composition of No. 4, but no blending no. 5-No. In No. 7, a slight amount of bleeding was confirmed when the plastic container was gently tilted. 1-No. Compared to 4, the material separation resistance was slightly inferior.
比較例に相当する配合No.8〜No.10のグラウト組成物はハンドミキサで練混ぜることが不可能で、流動性もまったくなかった。その為、圧縮強度とブリーディングの試験は行わなかった。また、配合No.11のグラウト組成物は増粘剤を抜いた配合であり、ポリ容器が水平な状態でも1cm以上の深さのブリーディング水の層が認められ、ブリーディング量も多く、材料分離が著しかった。 Formulation No. corresponding to the comparative example. 8-No. Ten grout compositions could not be kneaded with a hand mixer and had no fluidity. Therefore, compression strength and bleeding tests were not performed. In addition, blending No. The grout composition of No. 11 was formulated without the thickener, and a bleeding water layer having a depth of 1 cm or more was observed even when the plastic container was horizontal, the bleeding amount was large, and the material separation was remarkable.
減水剤Aを1.5重量%とし、セメントを98.22重量%とする以外はNo.1と同様の配合としたグラウト組成物について、グラウト組成物100重量部に対し25.0重量部となる量の水(1.000kg)で上記の試験を行ったところ、水平な状態でも約2mmのブリーディングがみられ、材料分離抵抗性は低かった。このときのJ14漏斗流下時間は練り混ぜ直後で3.9秒、30分後で4.2秒であり、練り混ぜ直後のグラウト温度は52℃であった。また、減水剤Aを0.05重量%とし、セメントを99.67重量%とする以外はNo.1と同様の配合としたグラウト組成物について、グラウト組成物100重量部に対し35.8重量部となる量の水(1.430kg)で上記の試験を行ったところ、材料分離抵抗性に優れ、上記のブリーディングの評価では◎に相当し、練り混ぜ直後のグラウト温度は52℃であった。また、このときのJ14漏斗流下時間は練り混ぜ直後で6.6秒、30分後で14.3秒であった。しかし、この配合のグラウトは、練り混ぜ終了5分後にハンドミキサによる撹拌(練り返し)を行わないとJ14漏斗流下時間の測定ができない程度に流動性が低下した。しかし、練り混ぜ終了5分後における練り返しを行ったときのJ14漏斗流下時間は8.9秒であった。配合No.1〜7のグラウトは、練り返しを行わなくても練り混ぜ終了5分後でもJ14漏斗流下時間は測定可能で、流動性の低下防止の点で優れていた。 No. 1 except that the water reducing agent A is 1.5% by weight and the cement is 98.22% by weight. The grout composition having the same composition as No. 1 was subjected to the above test with 25.0 parts by weight of water (1.000 kg) with respect to 100 parts by weight of the grout composition. The material separation resistance was low. 3.9 seconds after J 14 funnel flow time are kneaded at this time is 4.2 seconds after 30 minutes, grout temperature immediately after kneading was 52 ° C.. No. 5 except that the water reducing agent A is 0.05% by weight and the cement is 99.67% by weight. The grout composition having the same composition as No. 1 was subjected to the above test with 35.8 parts by weight of water (1.430 kg) with respect to 100 parts by weight of the grout composition. In the above evaluation of bleeding, it corresponds to ◎, and the grout temperature immediately after kneading was 52 ° C. Further, 6.6 seconds immediately after J 14 funnel flow time are kneaded at this time was 14.3 seconds after 30 minutes. However, grout of this formulation is stirred by the hand mixer fluid to the extent that can not be measured in Otherwise (kneading flashing) J 14 funnel flow time is reduced to finished 5 minutes after kneading. However, J 14 funnel flow time when performing the batter-back at the end 5 minutes after the kneading was 8.9 seconds. Compound No. 1-7 grout, also J 14 funnel flow time ends 5 minutes after kneading even without kneading kaeshi measurable, was excellent in terms of preventing deterioration in fluidity.
本発明の高温用グラウト組成物を使用することにより、材料温度が40℃以上と超高温であっても優れた流動性を示し、30分の可使時間も得られ、熱帯地域や日中の砂漠地域などの材料温度が40℃以上の高温となる環境下においても、各種充填材等に好適に使用することができる。 By using the high temperature grout composition of the present invention, even if the material temperature is 40 ° C. or higher, it exhibits excellent fluidity, and a pot life of 30 minutes can be obtained. Even in an environment where the material temperature is a high temperature of 40 ° C. or higher, such as in a desert area, it can be suitably used for various fillers.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2017065936A (en) * | 2015-09-28 | 2017-04-06 | 太平洋セメント株式会社 | Cement milk and method of producing the same |
JP2017128934A (en) * | 2016-01-21 | 2017-07-27 | 株式会社Ihiインフラシステム | Concrete construction method |
CN115321927A (en) * | 2022-08-31 | 2022-11-11 | 中国电建集团成都勘测设计研究院有限公司 | Composite cement-based high-temperature flowing water grouting material and preparation method thereof |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2017065936A (en) * | 2015-09-28 | 2017-04-06 | 太平洋セメント株式会社 | Cement milk and method of producing the same |
JP2017128934A (en) * | 2016-01-21 | 2017-07-27 | 株式会社Ihiインフラシステム | Concrete construction method |
CN115321927A (en) * | 2022-08-31 | 2022-11-11 | 中国电建集团成都勘测设计研究院有限公司 | Composite cement-based high-temperature flowing water grouting material and preparation method thereof |
CN115321927B (en) * | 2022-08-31 | 2023-09-26 | 中国电建集团成都勘测设计研究院有限公司 | Composite cement-based high-temperature dynamic water grouting material and preparation method thereof |
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