JP2009161387A - Antiwashout underwater mortar composition for high temperature environment, and antiwashout underwater grout mortar composition for high temperature environment - Google Patents
Antiwashout underwater mortar composition for high temperature environment, and antiwashout underwater grout mortar composition for high temperature environment Download PDFInfo
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、高温環境用水中不分離性モルタル組成物に関し、詳しくは、３０℃の高温環境下においても、高い水中不分離性を備え、気中成形の圧縮強度に対する水中成形の圧縮強度の比率が高く、優れた練り混ぜ作業性及び優れた充填作業性を備える高温環境用水中不分離性モルタル組成物に関する。 The present invention relates to an underwater inseparable mortar composition for high temperature environments, and in particular, has a high underwater inseparability even under a high temperature environment of 30 ° C., and the ratio of the underwater forming compressive strength to the underwater forming compressive strength. The present invention relates to an underwater non-separable mortar composition for high-temperature environments, which is high and has excellent kneading workability and excellent filling workability.
土木工事又は建築工事において、海中を含む水中にモルタルを施工する場合、充填箇所の水をポンプ等で排水した後にモルタルを充填することが従来行われてきた。一般的なモルタルを充填箇所の水を排水することなく充填すると、当該モルタルが分離し、硬化不良や強度不足になり、且つ充填箇所の水がセメントや混和材料等で著しく濁るといった問題があった。近年、充填箇所の水をポンプ等で排水することなくモルタルを充填しても、著しい分離、硬化不良及び強度不足が起こらない、水中不分離性グラウト（モルタル）が知られるようになった（例えば特許文献１及び特許文献２参照）。 In civil engineering work or construction work, when constructing mortar in water including the sea, it has been conventionally performed to fill the mortar after draining the water at the filling site with a pump or the like. When general mortar is filled without draining the water at the filling location, the mortar is separated, resulting in poor curing and insufficient strength, and the water at the filling location is remarkably turbid due to cement or admixture. . In recent years, water-inseparable grout (mortar) has been known that does not cause significant separation, poor curing and insufficient strength even if mortar is filled without draining the water at the filling site with a pump or the like (for example, (See Patent Document 1 and Patent Document 2).
この水中不分離性グラウトは、セメント、水、骨材、減水剤、不分離剤（増粘剤）からなる。一般に増粘剤は高温になるほど性能が低下する。そのため、夏場等の高温環境下で水中不分離グラウトを使用する場合は、増粘剤の添加量を増やす必要があるが、増粘剤の添加量を増やすと練り混ぜ時にミキサに大きな負荷がかかるため、ハンドミキサでは練り混ぜることが困難であった。また、練り混ぜ難いことから、減水剤の性能が充分発揮されるまでに、練り混ぜ時間を長くする必要があった。 This underwater non-separable grout consists of cement, water, aggregate, water reducing agent, and non-separating agent (thickening agent). In general, the performance of the thickener decreases as the temperature increases. Therefore, when using non-separated grout in high temperature environment such as summer, it is necessary to increase the amount of thickener added. However, increasing the amount of thickener increases the load on the mixer during mixing. Therefore, it was difficult to knead with a hand mixer. Moreover, since it is difficult to mix, it was necessary to lengthen the mixing time until the performance of the water reducing agent was sufficiently exhibited.
また、増粘剤の添加量を増やすと、練り混ぜ時の摩擦で混練した水中不分離性グラウトの温度が上昇し、水中不分離性のために増量した増粘剤の効果が相殺されてしまうとともに、流動性の経過時間による低下（経時変化）が大きく起こるという問題があった。このため、高温環境下においても優れた水中不分離性を備え、短時間で練り上げることができ、且つ経時変化が小さい水中不分離性グラウト（モルタル）が求められていた。本願出願人は、ＪＡＳＳ１５Ｍ−１０３の条件にて、セメント、減水剤、増粘剤、骨材及び水からなるモルタルのフロー値を測定した場合に、練り混ぜ直後のフロー値よりも３０分後のフロー値が増大する減水剤と、練り混ぜ後のフロー値が増大することのない減水剤、及び／又はセルロース誘導体と水溶性天然高分子とを含有するモルタルが、可使時間が長く、しかも材料分離が起こらず、施工性に優れたものであることを見出し、２００１年に特許出願を行った（特許文献３参照）。しかし、この技術を高温環境下の水中不分離性グラウトに適用すると、練り混ぜ時間を長くする必要があった。
本発明は、高温環境用水中不分離性モルタル組成物について、従来の上記問題を解決したものであり、高温環境下においても優れた水中不分離性を備え、短時間で練り上げることができ、且つ経時変化が小さい高温環境用水中不分離性モルタル組成物を提供することを目的とする。また、本発明は、高温環境用水中不分離性グラウトモルタル組成物について、従来の上記問題を解決したものであり、高温環境下においても優れた水中不分離性を備え、短時間で練り上げることができ、且つ経時変化が小さい高温環境用水中不分離性グラウトモルタル組成物を提供することを目的とする。 The present invention solves the above-mentioned conventional problems for underwater inseparable mortar compositions for high temperature environments, has excellent underwater inseparability even in high temperature environments, can be kneaded in a short time, and An object of the present invention is to provide an underwater non-separable mortar composition for high-temperature environments with little change over time. In addition, the present invention solves the above-mentioned conventional problems for underwater non-separable grout mortar compositions for high-temperature environments, and has excellent underwater inseparability even in high-temperature environments and can be kneaded in a short time. An object of the present invention is to provide an underwater non-separable grout mortar composition for high-temperature environments that can be changed over time.
本発明は、特定の減水剤を併用することによって上記問題を解決した。即ち、本発明は、以下の（１）〜（２）で表す高温環境用水中不分離性モルタル組成物、及び（３）で表す高温環境用水中不分離性グラウトモルタル組成物である。
（１）セメント、骨材、増粘剤、速効性ポリカルボン酸系減水剤及び遅効性メラミン系減水剤を含有する高温環境用水中不分離性モルタル組成物。
（２）速効性ポリカルボン酸系減水剤を０．２質量％〜３．０質量％、遅効性メラミン系減水剤を０．２質量％〜３．０質量％含有する上記(１)に記載する高温環境用水中不分離性モルタル組成。
（３）上記（１）または(２)に記載する高温環境用水中不分離性モルタル組成物からなる高温環境用水中不分離性グラウトモルタル組成物。
The present invention has solved the above problem by using a specific water reducing agent in combination. That is, this invention is the underwater non-separable mortar composition for high temperature environments represented by the following (1)-(2), and the underwater non-separable grout mortar composition for high temperature environments represented by (3).
(1) An underwater non-separable mortar composition for high temperature environment containing cement, aggregate, thickener, fast-acting polycarboxylic acid-based water reducing agent and slow-acting melamine-based water reducing agent.
(2) The fast-acting polycarboxylic acid-based water reducing agent is contained in an amount of 0.2% by mass to 3.0% by mass, and the slow-acting melamine-based water reducing agent is contained in an amount of 0.2% by mass to 3.0% by mass. A water-inseparable mortar composition for high temperature environments.
(3) A non-separable grout mortar composition for high-temperature environments, comprising the non-separable mortar composition for high-temperature environments described in (1) or (2) above.
本発明によれば、高温環境下においても優れた水中不分離性を備え、短時間で練り上げることができ、且つ経時変化が小さい高温環境用水中不分離性モルタル組成物が得られる。本発明によれば、高温環境下においても、気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．８以上と優れた水中不分離性を備え、ハンドミキサによる９０秒間の練り混ぜで練り上げることができ、且つＪＩＳ Ｒ ５２０１「セメントの物理試験方法」１１．フロー試験で規定されるフローコーンを用いフローコーン取り去り後５分間静置後のフロー値（落下運動無し）（以下、「５分間静置フロー値」という。）の経時変化が５０ｍｍ以下と経時変化が小さい高温環境用水中不分離性モルタル組成物が得られる。 ADVANTAGE OF THE INVENTION According to this invention, the underwater non-separability mortar composition for high temperature environments which has the outstanding in-water non-separation property also in a high temperature environment, can be kneaded in a short time, and has a small temporal change is obtained. According to the present invention, even in a high-temperature environment, the compression strength ratio of the underwater molding specimen with respect to the compressive strength of the in-air molding specimen is 0.8 or more and excellent in water inseparability is achieved. 10. JIS R 5201 “Physical test method for cement” Change with time of 50 mm or less over time of flow value (no drop motion) after leaving the flow cone for 5 minutes after removing the flow cone using the flow test specified in the flow test (hereinafter referred to as “flow value after 5 minutes of standing”). A water-insoluble separable mortar composition for high-temperature environments is obtained.
本発明によれば、高温環境下においても、気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．８以上と優れた水中不分離性を備え、ハンドミキサによる９０秒間の練り混ぜで練り上げることができ、且つ５分間静置フロー値の経時変化が５０ｍｍ以下と経時変化が小さい高温環境用水中不分離性グラウトモルタル組成物が得られるので、充填不良となり難く且つ充分な強度が得易い。 According to the present invention, even in a high-temperature environment, the underwater molding specimen has an excellent incompressibility ratio of 0.8 or more in compression strength ratio of the underwater molding specimen with respect to the compressive strength of the in-air molding specimen. A water-insoluble separable grout mortar composition that can be kneaded and kneaded for 5 minutes and has a time-dependent change in flow value of 50 mm or less and a small time-dependent change can be obtained. Is easy to obtain.
本発明の高温環境用水中不分離性モルタル組成物及び本発明の高温環境用水中不分離性グラウトモルタル組成物は、高温環境下においても優れた水中不分離性を備えているので、充填により排出される水の処理が軽度で済むので、排水処理に掛かる手間やコストを軽減することができる。また、発明の高温環境用水中不分離性モルタル組成物及び本発明の高温環境用水中不分離性グラウトモルタル組成物は、練り混ぜに使用するミキサを能力（消費電力）も小さなものでも短時間で練り上げることが可能である。また、このことにより、練り混ぜに使用する電力で発生するＣＯ２量も少なくできるので、環境の負荷を小さなものとすることができる。 The underwater non-separable mortar composition for high temperature environment of the present invention and the underwater non-separable grout mortar composition for high temperature environment of the present invention have excellent underwater non-separability even under a high temperature environment, and are discharged by filling. Since the treatment of the generated water is light, it is possible to reduce labor and cost for the wastewater treatment. In addition, the underwater non-separable mortar composition for high-temperature environments of the invention and the underwater non-separable grout mortar composition for high-temperature environments of the present invention can be used in a short time even if they have a small ability (power consumption) for mixing. It can be kneaded. In addition, this makes it possible to reduce the amount of CO 2 generated by the power used for kneading, thereby reducing the environmental load.
以下、本発明を実施例と共に具体的に説明する。
本発明は、セメント、骨材、増粘剤、速効性ポリカルボン酸系減水剤及び遅効性メラミン系減水剤を含有する高温環境用水中不分離性モルタル組成物である。本発明において、速効性減水剤とは、３０℃の恒温室内において、ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に規定される標準砂１３５０ｇ、普通ポルトランドセメント１３５０ｇ、水４０５ｇに、回転数１０００ｒ．ｐ．ｍ．，羽根直径１００ｍｍのハンドミキサで内径１８０ｍｍ，深さ２１０ｍｍの金属性容器内で全材料投入後９０秒間練り混ぜた直後のＪＩＳ Ｒ ５２０１「セメントの物理試験方法」１１．フロー試験に準じて測定したフロー値（落下運動無し）（以下、「ＪＩＳ静置フロー値」という。）が２５０ｍｍ〜３００ｍｍとなる量の当該減水剤を配合し（当該減水剤が水溶液の場合は、当該減水剤の量を水量の内割りとする。）、上記方法でハンドミキサにより練り混ぜ、練り混ぜから１５分後のＪＩＳ静置フロー値が練り混ぜ直後のＪＩＳ静置フロー値よりも小さい値となる減水剤をいう。速効性ポリカルボン酸系減水剤とは、この速効性減水剤のうちポリカルボン酸系のものをいう。また、本発明において、遅効性減水剤とは、同様に上記方法でハンドミキサにより練り混ぜ、練り混ぜから１５分後のＪＩＳ静置フロー値が練り混ぜ直後のＪＩＳ静置フロー値と同じ値又は大きな値となる減水剤をいう。遅効性メラミン系減水剤とは、遅効性減水剤のうちメラミン系のものをいう。なお、本発明において、減水剤とは、高性能減水剤，高性能ＡＥ減水剤、ＡＥ減水剤及び流動化剤を含む意味である。
Hereinafter, the present invention will be specifically described together with examples.
The present invention is an underwater non-separable mortar composition for high-temperature environments containing cement, aggregate, thickener, fast-acting polycarboxylic acid-based water reducing agent, and slow-acting melamine-based water reducing agent. In the present invention, the rapid-acting water reducing agent is a standard sand 1350 g, ordinary Portland cement 1350 g, water 405 g and a rotation speed of 1000 r. p. m. JIS R 5201 “Physical testing method of cement” immediately after mixing for 90 seconds after all materials are charged in a metallic container having an inner diameter of 180 mm and a depth of 210 mm with a hand mixer having a blade diameter of 100 mm. The water-reducing agent is blended in such an amount that the flow value measured according to the flow test (no drop motion) (hereinafter referred to as “JIS static flow value”) is 250 mm to 300 mm (when the water-reducing agent is an aqueous solution). The amount of the water reducing agent is divided into the amount of water.) Kneading with a hand mixer by the above method, and the JIS static flow value 15 minutes after mixing is smaller than the JIS static flow value immediately after mixing. A water-reducing agent that gives value. The fast-acting polycarboxylic acid-based water reducing agent refers to a polycarboxylic acid-based one of the fast-acting water reducing agents. Further, in the present invention, the slow-acting water reducing agent is similarly kneaded with a hand mixer by the above method, and the JIS static flow value after 15 minutes from the kneading is the same as the JIS static flow value immediately after mixing or A water reducing agent with a large value. The slow-acting melamine-based water reducing agent refers to a melamine-based one of the slow-acting water reducing agents. In the present invention, the 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.
速効性ポリカルボン酸系減水剤の含有率は、０．２質量％〜３．０質量％とすることが、ハンドミキサによる９０秒間の練り混ぜで練り上げることができ、且つ高温環境下においても、気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．８以上と優れた水中不分離性を備えることから好ましい。本発明において、「練り上がる」とは、上記方法に準じハンドミキサである時間（ｙ秒間）練り混ぜたときの５分間静置フロー値に対する、更に３０秒間練り混ぜ後の５分間静置フロー値の増加が５ｍｍ以下となることを云い、このときの練り上がり時間はｙ秒間とする。 The content of the fast-acting polycarboxylic acid-based water reducing agent can be 0.2% by mass to 3.0% by mass, and can be kneaded by kneading for 90 seconds with a hand mixer. It is preferable because the compression strength ratio of the underwater molding specimen to the compressive strength of the in-air molding specimen is 0.8 or more and excellent in water inseparability is provided. In the present invention, “kneading up” means a 5-minute standing flow value after mixing for 30 seconds, compared to a 5-minute standing flow value when kneading for a time (y seconds) as a hand mixer according to the above method. In this case, the kneading time is y seconds.
遅効性メラミン系減水剤の含有率は、０．２質量％〜３．０質量％とすることが、経時変化がより小さく、練り混ぜ直後の５分間静置フロー値に対する、練り混ぜから１時間後の５分間静置フロー値の減少（流動性の低下）が、１０ｍｍ以内とすることができることから好ましい。 The content of the slow-acting melamine water reducing agent is 0.2% by mass to 3.0% by mass, so that the change with time is smaller, and the flow rate after standing for 5 minutes immediately after mixing is 1 hour after mixing. The subsequent decrease in the flow value for 5 minutes (reduction in fluidity) can be made within 10 mm, which is preferable.
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よく、例えば、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、エコセメント、並びにこれらポルトランドセメント又はエコセメントに、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、太平洋セメント社製「ジェットセメント」（商品名）や住友大阪セメント社製「ジェットセメント」（商品名）等の超速硬セメント、アルミナセメント等が挙げられ、これらを一種単独で又は二種以上併用して用いることができる。 The cement used in the present invention may be a hydraulic cement, for example, various portland cements such as normal, early strength, ultra-early strength, low heat and moderate heat, ecocements, and these portland cements or ecocements, Various mixed cements mixed with fly ash, blast furnace slag, silica fume, limestone fine powder, etc., "Jet Cement" (trade name) manufactured by Taiheiyo Cement Co., Ltd. and "Jet Cement" (trade name) manufactured by Sumitomo Osaka Cement Co., Ltd. And alumina cement, and the like. These can be used alone or in combination of two or more.
セメントの含有率は、２５質量％〜７５質量％とすることが好ましい。２５質量％未満では圧縮強度が低く、７５質量％を超えると水中不分離性モルタルの粘性が高すぎて練り混ぜ作業、充填作業又は使用器具・機器の洗浄作業が行い難い。より好ましいセメントの含有率は、４０質量％〜７０質量％である。 The cement content is preferably 25% by mass to 75% by mass. If it is less than 25% by mass, the compressive strength is low, and if it exceeds 75% by mass, the viscosity of the inseparable mortar in water is too high, and it is difficult to perform kneading work, filling work, or cleaning work of used equipment / equipment. A more preferable cement content is 40% by mass to 70% by mass.
本発明で使用する骨材としては、例えば、川砂、海砂、山砂、砕砂、人工細骨材、スラグ細骨材、再生細骨材、スラグ細骨材、珪砂、石粉、川砂利、陸砂利、砕石、人工粗骨材、スラグ粗骨材、再生粗骨材、スラグ粗骨材等が挙げられ、これらの一種又は二種以上の使用が可能であるが、モルタルが高い流動性を得ることから、公称呼び寸法１０ｍｍの篩に留まる粒子が１質量％未満であることが好ましく、公称呼び寸法５ｍｍの篩に留まる粒子が１質量％未満であることがより好ましい。 Examples of the aggregate used in the present invention include river sand, sea sand, mountain sand, crushed sand, artificial fine aggregate, slag fine aggregate, recycled fine aggregate, slag fine aggregate, quartz sand, stone powder, river gravel, land Gravel, crushed stone, artificial coarse aggregate, slag coarse aggregate, recycled coarse aggregate, slag coarse aggregate, and the like can be used. One or more of these can be used, but mortar has high fluidity. Therefore, it is preferable that the particles remaining on the sieve having a nominal nominal size of 10 mm are less than 1% by mass, and the particles remaining on the sieve having a nominal nominal size of 5 mm are more preferably less than 1% by mass.
骨材の含有率は、２５質量％〜７５質量％とすることが好ましい。２５質量％未満では水中不分離性モルタルの粘性が高すぎて練り混ぜ作業、充填作業又は使用器具・機器の洗浄作業が行い難く、７５質量％を超えるとい圧縮強度が低い。より好ましい骨材の含有率は、３０質量％〜６０質量％である。 The aggregate content is preferably 25% by mass to 75% by mass. If it is less than 25% by mass, the viscosity of the water-inseparable mortar is too high to perform kneading work, filling work, or cleaning of used equipment / equipment, and if it exceeds 75% by mass, the compressive strength is low. A more preferable aggregate content is 30% by mass to 60% by mass.
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、少量で水中不分離性が高いことから水溶性セルロースが好ましい。水溶性セルロースとしては、ヒドロキシアルキルセルロースおよび／またはヒドロキシアルキルアルキルセルロースからなる非イオン性の水溶性セルロースエーテルが用いられる。ヒドロキシアルキルセルロースとしては、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース等が挙げられる。ヒドロキシアルキルアルキルセルロースとしては、ヒドロキシエチルメチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルエチルセルロース等が挙げられる。これらの水溶性セルロースは１種を用いてもよく、または２種以上を併用しても良い。これらの内では、ヒドロキシプロピルメチルセルロースおよび／またはヒドロキシエチルセルロースがより好ましい。本発明に使用する水溶性セルロースは、その１％濃度水溶液の回転粘度計による２０℃における粘度が、ｐＨ１２〜１３のアルカリ性で１０００〜１００００mPa・Sであるものが好ましい。この粘度範囲であるものは、モルタルの練り混ぜ水により早期に溶け易く、溶け残り難いので好ましい。 Examples of the thickener used in the present invention include water-soluble celluloses such as hydroxymethyl cellulose and hydroxypropyl cellulose; polysaccharides such as alginic acid, β-1,3 glucan, pullulan and welan gum; polyvinyl such as acrylic resin and polyvinyl alcohol; These can be used singly or in combination of two or more, but water-soluble cellulose is preferable because of its small amount and high inseparability in water. As the water-soluble cellulose, nonionic water-soluble cellulose ether composed of hydroxyalkyl cellulose and / or hydroxyalkylalkyl cellulose is used. Examples of the hydroxyalkyl cellulose include hydroxyethyl cellulose and hydroxypropyl cellulose. Examples of the hydroxyalkylalkylcellulose include hydroxyethylmethylcellulose, hydroxypropylmethylcellulose, and hydroxyethylethylcellulose. These water-soluble celluloses may be used alone or in combination of two or more. Of these, hydroxypropylmethylcellulose and / or hydroxyethylcellulose are more preferred. The water-soluble cellulose used in the present invention preferably has a 1% strength aqueous solution having a viscosity at 20 ° C. measured by a rotational viscometer of 1000 to 10,000 mPa · S at pH 12-13. Those having this viscosity range are preferable because they are easily dissolved early in a mortar kneading water, and hardly dissolved.
増粘剤の含有率は、好ましくは、０．１質量％〜１質量％である。０．１質量％未満では気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．８に達しない虞があり、１質量％を超えると水中不分離性モルタルの粘性が高すぎて練り混ぜ作業、充填作業又は使用器具・機器の洗浄作業が行い難い。高温環境下において、練り上げた水中不分離性モルタルが、２００ｍｍ〜３００ｍｍの５分間静置フロー値が得られ、水中不分離性グラウトモルタルとして使用可能となることから、増粘剤のより好ましい含有率は、０．２質量％〜０．５質量％である。 The content of the thickener is preferably 0.1% by mass to 1% by mass. If it is less than 0.1% by mass, the compression strength ratio of the underwater molding specimen to the compressive strength of the air molding specimen may not reach 0.8. If it exceeds 1% by mass, the viscosity of the inseparable mortar is high. It is too difficult to perform kneading work, filling work or cleaning work of used tools / equipment. In a high temperature environment, the kneaded underwater inseparable mortar has a stationary flow value of 200 to 300 mm for 5 minutes and can be used as an underwater inseparable grout mortar. Is 0.2% by mass to 0.5% by mass.
本発明の高温環境用水中不分離性モルタル組成物には、セメント、増粘剤、骨材、速効性ポリカルボン酸系減水剤及び遅効性メラミン系減水剤以外に、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併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、膨張材(剤)、急結剤(材)、急硬剤(材)、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、保水剤等が挙げられる。特に、無収縮の高温環境用水中不分離性モルタル組成物とするときは、膨張材、発泡剤および消泡剤を含有することが好ましい。 The water-inseparable mortar composition for high-temperature environments according to the present invention includes a cement, a thickener, an aggregate, a fast-acting polycarboxylic acid-based water reducing agent, and a slow-acting melamine-based water reducing agent, as well as one type of admixture other than the above. Or 2 or more types can be used together in the range which does not impair the effect of this invention. As this admixture, for example, cement polymer, foaming agent, foaming agent, waterproofing material, rust preventive agent, shrinkage reducing agent, water retention agent, pigment, fiber, water repellent agent, whitening prevention agent, expansion material (agent) , Quick setting agent (material), quick hardening agent (material), antifoaming agent, blast furnace slag fine powder, fly ash, stone powder, silica fume, volcanic ash, water repellent, surface hardening agent, water retention agent and the like. In particular, when a non-shrinkable water-insoluble separable mortar composition is used, it is preferable to contain an expanding material, a foaming agent and an antifoaming agent.
本発明の高温環境用水中不分離性モルタル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、リボンミキサ等のミキサにより、所定量の本発明の高温環境用水中不分離性モルタル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に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、本発明の高温環境用水中不分離性モルタル組成物を製造することもできる。 The method for producing the underwater inseparable mortar composition for high temperature environment of the present invention is not particularly limited. For example, a predetermined amount of the high temperature environment of the present invention is obtained by using a mixer such as a gravity concrete mixer, a Henschel mixer, or a ribbon mixer. It can manufacture by mixing each material of the underwater non-separable mortar composition. 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. It may be added one by one, or part or all may be added at the same time. In addition, the method of measuring and introducing each material into a container such as a bag or a polyethylene container, the water inseparability of the present invention for high-temperature environments A mortar composition can also be produced.
本発明の高温環境用水中不分離性モルタル組成物は、水と混練して用いる。水と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環境用水中不分離性モルタル組成物を全量加え混練する方法、水に本発明の高温環境用水中不分離性モルタル組成物を混練しながら加え更に混練する方法、本発明の高温環境用水中不分離性モルタル組成物に水を全量加え混練する方法、本発明の高温環境用水中不分離性モルタル組成物に水を混練しながら加え更に混練する方法、水及び本発明の高温環境用水中不分離性モルタル組成物のそれぞれ一部ずつを２以上に分けて混練し、混練したものを合わせて更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 underwater inseparable mortar composition for high temperature environment of the present invention is used by kneading with water. The method of kneading with water is not particularly limited, for example, a method of adding the whole amount of the water-insoluble separable mortar composition of the present invention to water and kneading, and the water of the water-inseparable mortar composition of the present invention for high-temperature environment. A method of adding and further kneading while kneading, a method of adding and kneading all the water to the underwater non-separable mortar composition for high temperature environment of the present invention, and kneading water to the underwater non-separable mortar composition for high temperature environment of the present invention. In addition, there are a method for further kneading, a method for kneading water and a part of the water-insoluble separable mortar composition for high temperature environment of the present invention into two or more, and kneading the kneaded materials further. 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, such as a pan concrete mixer, a pug mill concrete mixer, a gravity concrete mixer, a grout mixer, a hand mixer, and a plaster mixer.
本発明の高温環境用水中不分離性モルタル組成物と混練する水は、水道水が推奨されるが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。このとき用いる水の量は、本発明の高温環境用水中不分離性モルタル組成物１００質量部に対し、１０質量部〜５０質量部が好ましく、１５質量部〜４０質量部が更に好ましい。 The water to be kneaded with the underwater inseparable mortar composition for high temperature environment of the present invention is not particularly limited, although tap water is recommended. You may use the water contained in an admixture. The amount of water used at this time is preferably 10 parts by mass to 50 parts by mass, and more preferably 15 parts by mass to 40 parts by mass with respect to 100 parts by mass of the underwater non-separable mortar composition for high temperature environment of the present invention.
本発明の高温環境用水中不分離性モルタル組成物を混練することにより製造した高温環境用水中不分離性モルタルの使用方法は特に限定されない。製造した高温環境用水中不分離性モルタルをモルタルポンプやコンクリートポンプにより圧送し、トレミー管又は圧送ホースの先端を先に充填した該水中不分離性モルタルに挿入し、水中を落下させないように該水中不分離性モルタルを充填するすることが好ましい。 The usage method of the underwater inseparable mortar for high temperature environments manufactured by kneading the underwater inseparable mortar composition for high temperature environments of the present invention is not particularly limited. The produced water-inseparable mortar for high-temperature environments is pumped by a mortar pump or a concrete pump, and the tip of a tremey pipe or a pumping hose is inserted into the previously filled water-inseparable mortar, so that the water does not fall. It is preferred to fill inseparable mortar.
また、本発明の高温環境用水中不分離性グラウトモルタル組成物は、上記の高温環境用水中不分離性モルタル組成物からなる。水を混練した水中不分離性モルタルの５分間静置フロー値が２００ｍｍ〜３００ｍｍとなる上記の高温環境用水中不分離性モルタル組成物が好ましい。 Moreover, the underwater non-separable grout mortar composition for high temperature environments of this invention consists of said non-separable mortar composition for underwater high temperature environments. The above-mentioned underwater inseparable mortar composition for high-temperature environments in which the water flow rate of the inseparable mortar in which water is kneaded is 200 mm to 300 mm for 5 minutes is preferable.
［実施例１］
表１に示す配合割合のモルタル組成物を各水準６ｋｇ作製した。作製したモルタル組成物の品質試験として経時変化の測定、練り上がり時間の確認及び圧縮強度試験を行った。その結果を表２及び表３に示す。このときの使用材料、モルタル組成物の作製方法、モルタルの作製方法、及び品質試験方法を以下に示す。なお、供試体作成、練り混ぜ及び養生は全て３０℃で行い、モルタル組成物の温度も３０℃とした上で試験を行った。
＜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）
骨材： 珪砂（粗粒率；３．８０，比重；２．７０，公称呼び寸法５ｍｍの篩に留まる粒子は０質量％）
水： 水道水
速効性ポリカルボン酸系減水剤：水溶性メタクリル系グラフトポリマーを主成分とする粉末型高性能減水剤市販品（練り混ぜから１５分後のＪＩＳ静置フロー値が混ぜた直後のＪＩＳ静置フロー値よりも小さい値である。）
遅効性ポリカルボン酸系減水剤：水溶性ポリメタクリン酸系グラフトポリマーを主成分とする粉末型高性能減水剤市販品（練り混ぜから１５分後のＪＩＳ静置フロー値が混ぜた直後のＪＩＳ静置フロー値よりも大きい値である。）
遅効性メラミン系減水剤：メラミンスルホン酸塩縮合重合体を主成分とする粉末型高性能減水剤市販品（練り混ぜから１５分後のＪＩＳ静置フロー値が混ぜた直後のＪＩＳ静置フロー値よりも小さ大きい値である。）
増粘剤： ヒドロキシプロピルメチルセルロース〔１質量％濃度水溶液の回転粘度計（東機産業社製回転粘度計ＲＢ−８０Ｈ、ローター；Ｈ１、回転数；５ｒ．ｐ．ｍ．）による２０℃における粘度が、ｐＨ１２.５で１２６９ｍＰａ・Ｓ（ｐＨ７で完全に溶解させた後に、水酸化カルシウムを加えてｐＨを調整した後に測定した値）〕
＜モルタル組成物の作製方法＞
作製するモルタル組成物の質量が６ｋｇとなる量の表１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モルタル組成物を製造した。
＜モルタルの作製方法＞
モルタル組成物１００質量部に対し２５質量部となる量の水（１．５ｋｇ）を、内経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の東芝社製ハンドミキサ「スーパーベビーミックス ＳＢＭ−１５０Ｅ１」（商品名）を羽根が水に接する状態で回転させながら１０秒間かけてモルタル組成物を容器内に投入した。続けて投入完了後から９０秒間ハンドミキサにより練り混ぜを行いモルタルを製造した。
＜品質試験方法＞
・経時変化の測定
投入完了後から９０秒間練り混ぜて製造した各モルタルの練り混ぜ直後及び１時間後の５分間静置フロー値を測定した。また、合わせて練り混ぜ直後のモルタル温度を測定した。
・練り上がり時間の確認
練り混ぜ時間を、経時変化の測定時の９０秒間の他に、１２０秒間、１５０秒間及び１８０秒間と変えて、同様に練り混ぜ直後の５分間静置フロー値を測定し、練り上がり時間を確認した。
・圧縮強度試験
土木学会規準ＪＳＣＥ−Ｇ ５４１「充填モルタルの圧縮強度試験方法」に準じ、気中成形供試体の材齢２８日の圧縮強度及び水中成形供試体の材齢２８日の圧縮強度を測定し、気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比を算出した。このとき、水中成形供試体は、土木学会規準ＪＳＣＥ−Ｆ ５０４「水中不分離性コンクリートの圧縮強度試験用水中作製供試体の作り方」に準じ作製した。但し、脱型は材齢１日とし、水温は３０℃とした。
[Example 1]
6 kg of mortar compositions having the blending ratios shown in Table 1 were prepared. As a quality test of the prepared mortar composition, measurement of change over time, confirmation of kneading time, and compressive strength test were performed. The results are shown in Tables 2 and 3. The materials used at this time, the preparation method of a mortar composition, the preparation method of a mortar, and the quality test method are shown below. The specimen preparation, kneading and curing were all performed at 30 ° C., and the test was performed after the temperature of the mortar composition was set to 30 ° C.
<Materials used>
Cement: Normal Portland cement (manufactured by Taiheiyo Cement)
Aggregate: Silica sand (rough particle ratio: 3.80, specific gravity: 2.70, 0% by mass of particles remaining on a sieve having a nominal nominal size of 5 mm)
Water: tap water quick-acting polycarboxylic acid-based water reducing agent: powder-type high-performance water reducing agent commercial product based on water-soluble methacrylic graft polymer (immediately after mixing JIS static flow value 15 minutes after mixing) (It is a value smaller than the JIS static flow value.)
Slow-acting polycarboxylic acid-based water reducing agent: Commercially available powder type high-performance water-reducing agent mainly composed of water-soluble polymethacrylic acid-based graft polymer (the JIS still standing immediately after mixing the JIS standing flow value 15 minutes after mixing) (The value is larger than the flow value.)
Slow-acting melamine water reducing agent: Commercially available powder type high-performance water reducing agent based on melamine sulfonate condensation polymer (JIS static flow value immediately after mixing JIS static flow value 15 minutes after mixing) It is a smaller value than a larger value.)
Thickener: Hydroxypropyl methylcellulose [rotary viscometer of 1% strength by weight aqueous solution (rotary viscometer RB-80H manufactured by Toki Sangyo Co., Ltd., rotor: H1, rotation speed: 5 rpm) 1269 mPa · S at pH 12.5 (measured after pH was adjusted by adding calcium hydroxide after complete dissolution at pH 7)]
<Method for producing mortar composition>
Each material of the ratio shown in Table 1 in an amount that the mass of the mortar composition to be prepared is 6 kg is put into a plastic bag (length 650 mm × width 350 mm × thickness 0.1 mm), sealed, and shaken by hand for 60 seconds. The mortar composition was manufactured by mixing each material.
<Mortar production method>
Water (1.5 kg) in an amount of 25 parts by mass with respect to 100 parts by mass of the mortar composition was placed 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 mortar composition was put into the container over 10 seconds while rotating a hand mixer “Super Baby Mix SBM-150E1” (trade name) having a blade diameter of 100 mm in contact with water. Subsequently, after completion of the addition, the mixture was kneaded with a hand mixer for 90 seconds to produce a mortar.
<Quality test method>
-Measurement of time-dependent change Immediately after kneading and after 1 hour of each mortar produced by kneading for 90 seconds after completion of charging, the static flow value was measured for 5 minutes. Moreover, the mortar temperature immediately after mixing and kneading was measured.
・ Confirmation of kneading time The mixing time is changed to 120 seconds, 150 seconds and 180 seconds in addition to 90 seconds when measuring the change over time. Similarly, the static flow value for 5 minutes immediately after mixing is measured. , Confirmed the kneading time.
・ Compressive strength test According to JSCE-G 541 “Compressive strength test method of filled mortar”, compressive strength of air molded specimens at 28 days of age and compressive strength of underwater molded specimens at 28 days of age. Measured and the ratio of the compressive strength of the underwater molded specimen to the compressive strength of the air molded specimen was calculated. At this time, the underwater molded specimen was produced according to the Japan Society of Civil Engineers standard JSCE-F 504 "How to make an underwater preparation specimen for compressive strength test of underwater non-separable concrete". However, demolding was performed at a material age of 1 day, and the water temperature was 30 ° C.
本発明の実施例に相当する配合Ｎｏ．１及びＮｏ．２のモルタル組成物は、何れも練り混ぜ時間が９０秒間と短時間で練り上がり、経時変化（５分間静置フロー値の経過時間による低下）が１０ｍｍ以内と少なく、練り混ぜ直後のモルタル温度も４０℃と比較的低く、且つ気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．８以上と優れた水中不分離性を備えていた。また、この配合Ｎｏ．１〜Ｎｏ．３のモルタル組成物は、何れも５分間静置フロー値が２００ｍｍ以上で、グラウトモルタル組成としても充分な性能を有していた。 Formulation No. corresponding to the examples of the present invention. 1 and no. Each of the mortar compositions of No. 2 kneaded in a short time of 90 seconds, and the change with time (reduction due to the elapsed time of the 5-minute standing flow value) was less than 10 mm, and the mortar temperature immediately after mixing was also low. It was comparatively low at 40 ° C., and had an excellent inseparability in water, with the compression strength ratio of the underwater molded specimen to the compressive strength of the in-air molded specimen being 0.8 or more. In addition, this formulation No. 1-No. Each of the mortar compositions of No. 3 had a static flow value of 200 mm or more for 5 minutes, and had sufficient performance as a grout mortar composition.
比較例に相当する配合Ｎｏ．３及びＮｏ．５のモルタル組成物は、何れも練り混ぜ時間が１８０秒以上と練り上がるのに長時間を有し、練り混ぜ直後のモルタル温度も４０℃を超え高く、且つ気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．７未満と、本発明の実施例に相当する配合に比べて劣っていた。また、配合Ｎｏ．４のモルタル組成物は、練り混ぜ時間が９０秒間と短時間で練り上がったが、経時変化（５分間静置フロー値の経過時間による低下）が９２ｍｍと大きく、気中成形供試体の圧縮強度に対する水中成形供試体の圧縮強度比が０．７未満と、本発明の実施例に相当する配合に比べて劣っていた。 Formulation No. corresponding to the comparative example. 3 and no. The mortar composition of No. 5 has a long mixing time of 180 seconds or more, the mortar temperature immediately after mixing is higher than 40 ° C., and the compressive strength of the molded specimen in the air is high. The compression strength ratio of the underwater molded specimen was less than 0.7, which was inferior to the formulation corresponding to the example of the present invention. In addition, blending No. The mortar composition of No. 4 kneaded in a short time of 90 seconds, but the change with time (reduction due to the elapsed time of the 5-minute stationary flow value) was as large as 92 mm, and the compressive strength of the molded specimen in the air The compression strength ratio of the underwater molded specimen with respect to was less than 0.7, which was inferior to the formulation corresponding to the example of the present invention.
本発明の高温環境用水中不分離性モルタル組成物及び高温環境用水中不分離性グラウトモルタル組成物を使用することにより、高温環境下においても優れた水中不分離性を示し、短時間で練り上げることができ、且つ経時変化が小さい高温環境用水中不分離性モルタル及び高温環境用水中不分離性グラウトモルタルが得られ、これらは、止水工事、水路、水中構築物、プール及び護岸等の補修工事等に好適に使用することができる。また、工期を短縮する目的等で充填個所の水を排水することなく本発明の高温環境用水中不分離性モルタル組成物を用いた水中不分離性モルタルを、新築の土木工事や建築工事等で用いることもできる。 By using the underwater inseparable mortar composition for high temperature environment and the underwater inseparable grout mortar composition for high temperature environment of the present invention, it exhibits excellent underwater inseparability even in a high temperature environment and is kneaded in a short time. Can be obtained, and underwater non-separable mortar for high temperature environment and underwater non-separable grout mortar for high temperature environment can be obtained. These include waterstop work, repair work for waterways, underwater structures, pools, revetments, etc. Can be suitably used. In addition, for the purpose of shortening the construction period, the underwater inseparable mortar using the underwater inseparable mortar composition for high temperature environment of the present invention without draining the water in the filling place can be used for newly constructed civil engineering or construction work. It can also be used.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012211057A (en) * | 2011-03-31 | 2012-11-01 | Ube Industries Ltd | Grout composition, grout slurry, and grout hardened body |
| JP2013249214A (en) * | 2012-05-30 | 2013-12-12 | Mitsubishi Materials Corp | Underwater anti-washout non-shrink grout |
| JP2014037329A (en) * | 2012-08-15 | 2014-02-27 | Denki Kagaku Kogyo Kk | Underwater non-separable concrete |
| JP2016037406A (en) * | 2014-08-06 | 2016-03-22 | 太平洋マテリアル株式会社 | High fluidity retention type underwater non-separable grout composition |
| JP2016121039A (en) * | 2014-12-25 | 2016-07-07 | 太平洋マテリアル株式会社 | Underwater non-dispersible mortar composition |
| JP2017114691A (en) * | 2015-12-21 | 2017-06-29 | 太平洋マテリアル株式会社 | Underwater non-separable mortar composition |
| JP2017218359A (en) * | 2016-06-10 | 2017-12-14 | 信越化学工業株式会社 | Method for producing hydraulic composition |
| CN111562189A (en) * | 2020-05-31 | 2020-08-21 | 太原理工大学 | Ultrahigh-temperature gas jet erosion test device for diversion trench material |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012211057A (en) * | 2011-03-31 | 2012-11-01 | Ube Industries Ltd | Grout composition, grout slurry, and grout hardened body |
| JP2013249214A (en) * | 2012-05-30 | 2013-12-12 | Mitsubishi Materials Corp | Underwater anti-washout non-shrink grout |
| JP2014037329A (en) * | 2012-08-15 | 2014-02-27 | Denki Kagaku Kogyo Kk | Underwater non-separable concrete |
| JP2016037406A (en) * | 2014-08-06 | 2016-03-22 | 太平洋マテリアル株式会社 | High fluidity retention type underwater non-separable grout composition |
| JP2016121039A (en) * | 2014-12-25 | 2016-07-07 | 太平洋マテリアル株式会社 | Underwater non-dispersible mortar composition |
| JP2017114691A (en) * | 2015-12-21 | 2017-06-29 | 太平洋マテリアル株式会社 | Underwater non-separable mortar composition |
| JP2017218359A (en) * | 2016-06-10 | 2017-12-14 | 信越化学工業株式会社 | Method for producing hydraulic composition |
| CN111562189A (en) * | 2020-05-31 | 2020-08-21 | 太原理工大学 | Ultrahigh-temperature gas jet erosion test device for diversion trench material |
| CN111562189B (en) * | 2020-05-31 | 2022-06-28 | 太原理工大学 | Ultrahigh-temperature gas jet erosion test device for diversion trench material |
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