JP2005187257A - Cement admixture and quick hardening cement composition - Google Patents

Cement admixture and quick hardening cement composition Download PDF

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JP2005187257A
JP2005187257A JP2003430306A JP2003430306A JP2005187257A JP 2005187257 A JP2005187257 A JP 2005187257A JP 2003430306 A JP2003430306 A JP 2003430306A JP 2003430306 A JP2003430306 A JP 2003430306A JP 2005187257 A JP2005187257 A JP 2005187257A
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cement
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cement composition
alkali metal
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JP4413605B2 (en
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Wataru Yuki
渡 結城
Manabu Nakada
学 中田
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Taiheiyo Materials Corp
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
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  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cement admixture from which mortar which hardens in an early time after kneading, exhibits high short time strength, and can keep a prescribed flowability during a certain time after kneading, for example, the time required for infiltrating into a crack to be repaired or a void in stratum or the time required for inpouring into a molding flask, that is to say, during working time required until the work is finished can be obtained; and to provide a quick hardening cement composition containing the same. <P>SOLUTION: The cement admixture contains citric acid and an alkali metal salt of tartaric acid. The quick hardening cement composition contains quick hardening cement as a main component and the admixture. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、流動性を長時間維持でき且つ短時間強度が高い高流動モルタルが得られるセメント用混和剤、及びそれを含有する速硬性セメント組成物に関するものである。   The present invention relates to an admixture for cement that can maintain fluidity for a long time and obtain a high-fluidity mortar with high strength for a short time, and a quick-hardening cement composition containing the same.

従来、モルタルの短時間強度を増大する材料としては、速硬性セメント、例えば、カルシウムアルミネートに無機硫酸塩を混合してなる促進材を配合した急結セメント（特許文献１）や、カルシウムハロアルミネートをセメントと同時に焼成して混入してなる急硬セメント（特許文献２）が用いられている。しかしながら、単にこれらのセメントを用いただけでは、速硬性セメントの硬化に必要な可使時間が確保できず、短時間での強度発現性が得られても現実の作業性が著しく悪化する問題がある。   Conventionally, as a material for increasing the short-time strength of mortar, quick-setting cement, for example, quick setting cement (Patent Document 1) blended with an accelerator obtained by mixing calcium sulfate with inorganic sulfate, Patent Document 1 or calcium haloaluminum A rapid-hardening cement (Patent Document 2) obtained by mixing an ate by firing at the same time as the cement is used. However, simply using these cements does not ensure the pot life necessary for curing fast-curing cements, and there is a problem that the actual workability is significantly deteriorated even if strength development can be obtained in a short time. .

この問題を解決するものとして、凝結遅延剤を用いて可使時間を延長することが行われており、例えば、カルシウムアルミネート系鉱物を促進材として含有する急結セメントに、凝結遅延剤を添加し、可使時間を確保する速硬性セメント組成物が知られている（特許文献３及び特許文献４）。ここで使用される凝結遅延剤として、クエン酸、酒石酸、グルコン酸及びリンゴ酸等のオキシカルボン酸又はそれらの塩等が挙げられている。   In order to solve this problem, it is possible to extend the pot life by using a setting retarder. For example, a setting retarder is added to a rapid setting cement containing calcium aluminate mineral as an accelerator. However, a fast-curing cement composition that secures the pot life is known (Patent Document 3 and Patent Document 4). Examples of the setting retarder used here include oxycarboxylic acids such as citric acid, tartaric acid, gluconic acid and malic acid, or salts thereof.

しかしながら、この方法で、すなわち、凝結遅延剤を多量に添加して可使時間を得ようとすると、短時間強度も同時に低下するという問題が生じていた。また、練り上がり時の所定の流動性を維持しているのは精々５〜１０分程度の短時間にすぎず、その後は、硬化はしないが流動性が損なわれる。また、これら従前の方法では、補修すべき亀裂、地層中の空隙に十分に充填ができない場合等があって、少ない凝結遅延剤の添加量で流動性保持性能の高い速硬性モルタルが製造できる速硬性セメント組成物が要望されている。
特開昭４８−１０２４号公報 特開昭４９−７７９３４号公報 特開２００１−２９４４６９号公報 特開２０００−２８１４１０号公報 However, in this method, that is, when an attempt is made to obtain a pot life by adding a large amount of a set retarder, there has been a problem that the strength is reduced at the same time. Further, the predetermined fluidity at the time of kneading is maintained for only a short time of about 5 to 10 minutes, and thereafter, the fluidity is impaired although it is not cured. In addition, in these conventional methods, there are cases where cracks to be repaired, voids in the formation cannot be sufficiently filled, etc., and a rapid hardening mortar with high fluidity retention performance can be produced with a small amount of setting retarder. There is a need for hard cement compositions.
JP-A-48-1024 JP-A 49-77934 JP 2001-294469 A JP 2000-281410 A

本発明の目的は、混練後の早い時間に硬化し且つ短時間強度が高く、更には補修すべき亀裂、地層中の空隙に浸透するに要する時間、又は型枠への流し込みに要する時間等の混練してから作業終了までに必要な作業時間中は、所定の流動性を保持することができるモルタルが得られるセメント混和剤及びそれを含有する速硬性セメント組成物を提供することにある。   The object of the present invention is to harden at an early time after kneading and to have high strength for a short time. An object of the present invention is to provide a cement admixture that can provide a mortar capable of maintaining a predetermined fluidity during a work time required from the kneading to the end of the work, and a fast-hardening cement composition containing the same.

本発明者は、上記課題を解決するために鋭意研究を進めたところ、クエン酸及び酒石酸アルカリ金属塩をセメントに混和すると、混練後の早い時間に硬化し且つ短時間強度が高く、更には混練した後の作業時間中は所定の流動性を有するモルタルを製造できるセメント組成物が得られることを見出し、本発明を完成した。
すなわち、本発明はクエン酸及び酒石酸アルカリ金属塩を含有するセメント混和剤を提供するものである。
また、本発明は速硬性セメントを主成分とし、クエン酸及び酒石酸アルカリ金属塩を含むセメント混和剤を含有する速硬性セメント組成物を提供するものである。 The present inventor has intensively studied to solve the above problems, and when citric acid and alkali metal tartrate are mixed with cement, it hardens in an early time after kneading and has high strength for a short time. The present inventors have found that a cement composition capable of producing a mortar having a predetermined fluidity can be obtained during the working time after the completion.
That is, the present invention provides a cement admixture containing citric acid and an alkali metal tartrate.
The present invention also provides a fast-setting cement composition containing a cement admixture containing a fast-setting cement as a main component and citric acid and an alkali metal tartrate salt.

本発明のセメント混和剤を用いたセメント組成物、特に速硬性セメントを主成分とするセメント組成物を用いたモルタルは、所定の流動性が４０分以上に渡って保持でき、更に材齢３時間後の圧縮強度が２０Ｎ／ｍｍ2以上の物性を有し強度発現性に優れる。 A mortar using a cement composition using the cement admixture of the present invention, particularly a cement composition mainly composed of a fast-hardening cement, can retain a predetermined fluidity for 40 minutes or more, and further has a material age of 3 hours. The later compressive strength has physical properties of 20 N / mm 2 or more, and is excellent in strength development.

本発明のセメント混和剤は、クエン酸及び酒石酸アルカリ金属塩を含有することを特徴とする。   The cement admixture of the present invention is characterized by containing citric acid and an alkali metal tartrate.

本発明で使用するクエン酸としては、例えば市販の試薬、食品添加物及び工業用等のクエン酸が挙げられる。   Examples of citric acid used in the present invention include commercially available reagents, food additives, and industrial citric acid.

本発明で使用する酒石酸アルカリ金属塩は、下式（１）   The alkali metal tartrate used in the present invention has the following formula (1):

Figure 2005187257
Figure 2005187257

〔式中、Ｒ1は水素原子、炭素数１〜５の低級アルキル基又はアルカリ金属原子を示し、Ｒ2はアルカリ金属原子を示す〕で表される化合物である。
ここで、炭素数１〜５の低級アルキル基としては、メチル基及びエチル基が好ましく、アルカリ金属原子としてはリチウム、ナトリウム及びカリウムが好ましい。 [Wherein R 1 represents a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms or an alkali metal atom, and R 2 represents an alkali metal atom].
Here, as a C1-C5 lower alkyl group, a methyl group and an ethyl group are preferable, and lithium, sodium, and potassium are preferable as an alkali metal atom.

酒石酸アルカリ金属塩としては、Ｒ1、Ｒ2の何れかがアルカリ金属であって、他が水素原子又はアルカリ金属であるものが好ましく、例えば酒石酸ナトリウム、酒石酸カリウム、酒石酸リチウム、酒石酸カリウムナトリウム等が挙げられる。特に、酒石酸カリウムナトリウムが、流動性保持時間が長く、速硬性セメントと混合し長期間貯蔵した場合に品質が安定化するのでより好ましい。
本発明で使用する酒石酸アルカリ金属塩としては、例えば市販の試薬及び工業用等の酒石酸ナトリウム、酒石酸カリウム、酒石酸カリウムナトリウム、酒石酸リチウム等が挙げられる。 The alkali metal tartrate is preferably one in which either R 1 or R 2 is an alkali metal and the other is a hydrogen atom or an alkali metal, such as sodium tartrate, potassium tartrate, lithium tartrate, sodium potassium tartrate, etc. Can be mentioned. In particular, potassium sodium tartrate is more preferable because the fluidity retention time is long, and the quality is stabilized when mixed with a fast-hardening cement and stored for a long time.
Examples of the alkali metal tartrate used in the present invention include commercially available reagents and industrial sodium tartrate, potassium tartrate, potassium sodium tartrate, lithium tartrate and the like.

酒石酸アルカリ金属塩は、後記の実施例において示すようにクエン酸を使用して凝結を遅延させたモルタルの流動性保持性能を、クエン酸と相俟って有効的に発揮するものである。   Alkali metal tartrate effectively exhibits the fluidity retention performance of mortar that has been delayed in setting using citric acid, as shown in the examples below, in combination with citric acid.

本発明のセメント混和剤中のクエン酸及び酒石酸アルカリ金属塩の含有比率は、クエン酸１００重量部に対して、酒石酸アルカリ金属塩が１０〜２５０重量部であるのが可使時間、流動性の面から好ましく、より好ましくは５０〜１００重量部である。上記範囲外では流動性が得られない場合がある。   The content ratio of the citric acid and the alkali metal tartrate in the cement admixture of the present invention is such that the alkali metal tartrate is 10 to 250 parts by weight with respect to 100 parts by weight of citric acid. From the aspect, it is preferably 50 to 100 parts by weight. Outside the above range, fluidity may not be obtained.

クエン酸と酒石酸アルカリ金属塩の混合方法は、特に制限されるものでなく、予めセメント組成物に混合する方法、セメント組成物混練時にそれらを個々に混合する方法、又は、クエン酸と酒石酸アルカリ金属塩を含有するものを混合する方法等が可能である。   The mixing method of the citric acid and the alkali metal tartrate is not particularly limited, and is a method of previously mixing the cement composition, a method of mixing them individually when the cement composition is kneaded, or a citric acid and an alkali metal tartrate. A method of mixing a salt-containing material is possible.

本発明のセメント混和剤には、増粘剤、減水剤、高性能減水剤、高性能ＡＥ減水剤、膨張材、収縮低減剤、防錆剤、防凍剤、顔料、消泡剤、発泡剤、繊維、ポリマー等の一種又は二種以上を含有させることが可能である。   The cement admixture of the present invention includes a thickener, a water reducing agent, a high performance water reducing agent, a high performance AE water reducing agent, an expansion material, a shrinkage reducing agent, a rust inhibitor, a defrosting agent, a pigment, an antifoaming agent, a foaming agent, One kind or two or more kinds of fibers, polymers and the like can be contained.

本発明のセメント混和剤は、セメント組成物に添加して使用する。特に速硬性セメントを使用したセメント組成物に好適に用いることができる。ここで、速硬性セメントとは、３時間程度までに強度を発現するものである。例えば、ポルトランドセメント、エコセメント又はこれらの混合セメントに炭酸ナトリウム、塩化カルシウム、硝酸塩、亜硝酸塩、仮焼ミョウバンを含むミョウバン、アルミナセメント、カルシウムアルミネート類、水ガラス等の凝結促進剤を添加したもの、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及びカルシウムアルミネート類と石膏類とを含有する急硬セメント等が挙げられる。
カルシウムアルミネート類としては、ＣａＯをＣ、Ａｌ2Ｏ3をＡ、及びＦｅ2Ｏ3をＦとして表したとき、Ｃ3Ａ、Ｃ2Ａ、Ｃ12Ａ7、Ｃ5Ａ3、ＣＡ、Ｃ3Ａ5又はＣＡ2等と表示される鉱物組成を有するカルシウムアルミネート、Ｃ2ＡＦ及びＣ4ＡＦ等と表示されるカルシウムアルミノフェライト等が挙げられる。更に、カルシウムアルミネート類には、カルシウムアルミネートにハロゲンが置換又は固溶したＣ3Ａ3・ＣａＦ2やＣ11Ａ7・ＣａＦ2等と表示されるカルシウムフロロアルミネートを含むカルシウムハロアルミネート、並びに、Ｃ3Ａ3・ＣａＳＯ4等と表示されるカルシウムサルホアルミネート、カルシウムナトリウムアルミネート、カルシウムリチウムアルミネート等も包含する総称である。
このカルシウムアルミネート類は、結晶質のもの、非晶質のもの及び結晶質と非晶質を混合又は混在したもののいずれも使用可能であり、上記カルシウムアルミネート類うちの一種又は二種以上を使用することが可能である。また石膏類とは無水石膏、半水石膏及び二水石膏を総称するものである。 The cement admixture of the present invention is used by being added to a cement composition. In particular, it can be suitably used for a cement composition using a fast setting cement. Here, the fast-curing cement expresses strength by about 3 hours. For example, Portland cement, Eco cement, or mixed cements with addition of setting accelerators such as sodium carbonate, calcium chloride, nitrate, nitrite, alum including calcined alum, alumina cement, calcium aluminates, water glass, etc. , “Jet Cement” (trade name) manufactured by Taiheiyo Cement Co., Ltd., “Jet Cement” (trade name) manufactured by Sumitomo Osaka Cement Co., Ltd. It is done.
When Calcium aluminates, representing the CaO C, the Al 2 O 3 A, and the Fe 2 O 3 as F, C 3 A, C 2 A, C 12 A 7, C 5 A 3, CA, Examples thereof include calcium aluminate having a mineral composition represented as C 3 A 5 or CA 2, calcium aluminoferrite represented as C 2 AF, C 4 AF, and the like. Further, the calcium aluminate includes calcium haloaluminate containing calcium fluoroaluminate represented as C 3 A 3 · CaF 2 or C 11 A 7 · CaF 2 in which halogen is substituted or dissolved in calcium aluminate. , As well as calcium sulfoaluminate, calcium sodium aluminate, calcium lithium aluminate and the like which are indicated as C 3 A 3 · CaSO 4 and the like.
As the calcium aluminate, any of crystalline, amorphous, and mixed or mixed crystalline and amorphous materials can be used, and one or more of the above calcium aluminates can be used. It is possible to use. The gypsum is a general term for anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum.

本発明のセメント混和剤のセメント組成物への添加方法としては、特に限定されるものではないが、予め、セメント混和剤を水以外のセメント組成物とミキサにより混合し、施工時に水とミキサにより混合することが好ましい。また、予めセメント混和剤を水に添加・混合したものをセメント組成物に添加して混練することも可能である。   The method for adding the cement admixture of the present invention to the cement composition is not particularly limited. However, the cement admixture is mixed with a cement composition other than water in advance with a mixer, and at the time of construction with water and mixer. It is preferable to mix. It is also possible to add and mix a cement admixture in water with the cement composition in advance.

本発明の速硬性セメント組成物は、速硬性セメントを主成分とし、上記セメント混和剤を含有することを特徴とする。   The fast-hardening cement composition of the present invention is characterized by comprising a fast-hardening cement as a main component and the cement admixture.

ここで使用する速硬性セメントは、上記の速硬性セメントであって、３時間程度までに強度を発現するものである。ポルトランドセメント、エコセメント又はこれらの混合セメントにカルシウムアルミネート類又はアルミナセメントを添加したものが好ましい。   The fast-hardening cement used here is the above-mentioned fast-hardening cement and exhibits strength by about 3 hours. Portland cement, ecocement, or a mixed cement obtained by adding calcium aluminate or alumina cement is preferable.

速硬性セメント組成物におけるセメント混和剤の使用量は、セメント・コンクリート中の速硬性セメント１００重量部に対して０．０１〜５重量部が好ましく、０．０７〜３重量部が強度発現性の面からより好ましい。０．０１重量部未満だとセメント組成物の凝結を抑制しにくく、可使時間及び流動性が不十分である場合があり、また、５重量部を超えると材齢３時間強度が充分でない場合があるため好ましくない。   The amount of the cement admixture used in the fast-curing cement composition is preferably 0.01 to 5 parts by weight, and 0.07 to 3 parts by weight based on 100 parts by weight of the fast-curing cement in cement and concrete. From the aspect, it is more preferable. If the amount is less than 0.01 part by weight, it is difficult to suppress the setting of the cement composition, and the pot life and fluidity may be insufficient. If the amount exceeds 5 parts by weight, the strength is not sufficient for 3 hours of age. This is not preferable.

本発明の速硬性セメント組成物は、上記速硬性セメント及びセメント混和剤を含有する以外は特に限定されるものではなく、更に必要に応じて細骨材や粗骨材等の骨材、増粘剤、膨張材、収縮低減剤、防錆剤、顔料、消泡剤、発泡剤、繊維、ポリマー等の一種又は二種以上を使用してもよい。
本発明の速硬性セメント組成物を用いてモルタルを製造する場合であれば、モルタル組成が速硬性セメント１００重量部に対し、セメント混和剤０．０１〜５重量部、水３０〜６０重量部、細骨材５０〜３００重量部となるように配合するのが好適である。更に好ましくは、速硬性セメント１００重量部に対し、セメント混和剤０．１〜５重量部、水３５〜４５重量部、細骨材１００〜２００重量部である。 The fast-curing cement composition of the present invention is not particularly limited except that it contains the above-mentioned fast-curing cement and cement admixture, and further, aggregates such as fine aggregate and coarse aggregate, and thickening as necessary. You may use 1 type, or 2 or more types, such as an agent, an expanding material, a shrinkage reducing agent, a rust preventive agent, a pigment, an antifoamer, a foaming agent, a fiber, a polymer.
If mortar is produced using the quick-setting cement composition of the present invention, the mortar composition is 0.01 to 5 parts by weight of cement admixture, 30 to 60 parts by weight of water with respect to 100 parts by weight of fast-setting cement. It is preferable to blend so as to be 50 to 300 parts by weight of fine aggregate. More preferably, the cement admixture is 0.1 to 5 parts by weight, water is 35 to 45 parts by weight, and the fine aggregate is 100 to 200 parts by weight with respect to 100 parts by weight of the fast-hardening cement.

本発明の速硬性セメント組成物の混練りには、特に限定されるものではないが、グラウトミキサ、ハンドミキサ及び強制攪拌ミキサ等が使用できる。   The kneading of the fast-curing cement composition of the present invention is not particularly limited, but a grout mixer, a hand mixer, a forced stirring mixer, or the like can be used.

以下に、本発明について実施例を挙げて更に詳しく説明する。本発明はこれらの実施例に限定されるものではない。   Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to these examples.

実施例１
アルミナセメント１００重量部に対して、２５０重量部の普通ポルトランドセメントを混合して速硬性セメントとして用いた。この速硬性セメント１００重量部に対して、表１に示す量の凝結遅延剤と細骨材１００重量部、更に水６０重量部を加え、ハンドミキサにより混練りして速硬性セメント組成物とし、品質試験を実施した。
その結果を表１に示す。使用材料及び品質試験の測定方法を以下に示す。 Example 1
250 parts by weight of ordinary Portland cement was mixed with 100 parts by weight of alumina cement and used as a fast-setting cement. With respect to 100 parts by weight of this fast-hardening cement, 100 parts by weight of a setting retarder and fine aggregate as shown in Table 1, and 60 parts by weight of water are added, and kneaded with a hand mixer to obtain a fast-hardening cement composition. A quality test was conducted.
The results are shown in Table 1. The materials used and the measurement method of the quality test are shown below.

＜使用材料＞
凝結遅延剤：Ａ；クエン酸／酒石酸カリウムナトリウム＝１００／２５０（混合重量比）
Ｂ； 〃 ＝１００／２００
Ｃ； 〃 ＝１００／１５０
Ｄ； 〃 ＝１００／１００
Ｅ； 〃 ＝１００／５０
Ｆ； 〃 ＝１００／１０
Ｇ； 〃 ＝１００／５
Ｈ；クエン酸
Ｉ；グルコン酸
Ｊ；酒石酸カリウムナトリウム
Ｋ；Ｌ-酒石酸
Ｌ；クエン酸ナトリウム／Ｌ−酒石酸＝１００／１００
Ｍ；クエン酸／酒石酸カリウムナトリウム＝１００／３００
アルミナセメント：ラファージュアルミネート社製アルミナセメント、「セカール５１ＢＴＦ」
普通ポルトランドセメント：太平洋セメント社製普通ポルトランドセメント
細骨材：石灰石砕砂（比重２．６，粗粒率（Ｆ．Ｍ．）２．７０）
水：水道水 <Materials used>
Setting retarder: A; citric acid / sodium potassium tartrate = 100/250 (mixing weight ratio)
B; 〃 = 100/200
C; 〃 = 100/150
D; 〃 = 100/100
E; 〃 = 100/50
F; 〃 = 100/10
G; 〃 = 100/5
H; citric acid
I: Gluconic acid
J: Sodium potassium tartrate
K: L-tartaric acid
L; sodium citrate / L-tartaric acid = 100/100
M: citric acid / sodium potassium tartrate = 100/300
Alumina cement: Alumina cement manufactured by Lafarge Aluminate, “SECAL 51BTF”
Normal Portland cement: Taiheiyo Cement Normal Portland cement fine aggregate: Limestone crushed sand (specific gravity 2.6, coarse particle ratio (FM) 2.70)
Water: tap water

＜測定方法＞
フロー値：「ＪＩＳ Ｒ ５２０１（セメントの物理試験方法）１１．フロー試験」に記載される方法において、落下運動を行わないで測定したフロー値。
流動性保持時間：ミキサーで全材料を混合後、１Ｌビーカーに移して静置し、容器を横にして流れなくなるまでの時間を測定し、流動性保持時間とした。
圧縮強度：各混練物をφ５０×１００ｍｍの型枠内に流し込み、２０℃で所定の材齢まで封緘養生して硬化体を作製した後、「ＪＩＳ Ａ １１０８（コンクリートの圧縮試験方法）」に準じて、各硬化体の圧縮強度を測定した。 <Measurement method>
Flow value: A flow value measured without performing a drop motion in the method described in “JIS R 5201 (physical test method for cement) 11. Flow test”.
Fluidity holding time: After mixing all the materials with a mixer, the mixture was transferred to a 1 L beaker and allowed to stand, and the time until the container stopped flowing sideways was measured to obtain the fluidity holding time.
Compressive strength: Each kneaded product is poured into a mold of φ50 × 100 mm, sealed and cured at 20 ° C. to a predetermined age, and a cured product is produced. Then, according to “JIS A 1108 (Concrete compression test method)” Then, the compressive strength of each cured body was measured.

Figure 2005187257
Figure 2005187257

凝結遅延剤の含有量、は速硬性セメント１００重量部に対する重量部である。   The content of the setting retarder is a part by weight based on 100 parts by weight of the fast-curing cement.

表１の結果から、本発明のセメント混和剤を使用した速硬性セメント組成物は、フレッシュモルタルの流動性が４０分以上保持でき、材齢３時間の圧縮強度が２０Ｎ／ｍｍ2以上の物性を有し強度発現性が良好であった。 From the results shown in Table 1, the fast-hardening cement composition using the cement admixture of the present invention can maintain the flowability of fresh mortar for 40 minutes or more, and has a physical strength of a compressive strength of 3 hours at an age of 20 N / mm 2 or more. It had good strength development.

本発明のセメント混和剤及び速硬性セメント組成物を使用することにより、従来と比べ、速硬性セメントを有する配合においてもモルタルの流動性が高く且つ良好な流動性保持性能が得られる速硬性モルタルが得られ、その結果、本発明の速硬性セメント組成物は、優れた短時間強度と充填性能が必要な道路の緊急補修工事、止水工事、道路、構築物及び構造物の補修工事等に、また長時間にわたって設備を休止できない箇所又は道路、軌道等の休止時間の限られた公共施設の補修工事等にも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、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 cement admixture and fast-curing cement composition of the present invention, a fast-curing mortar that has higher fluidity and has good fluidity-retaining performance even in a blend having a fast-curing cement as compared with the prior art. As a result, the quick-hardening cement composition of the present invention is suitable for road emergency repair work, water stoppage work, road, structure and structure repair work that require excellent short-time strength and filling performance. It can also be suitably used for repair work of places where facilities cannot be stopped for a long time or public facilities with limited downtime such as roads and tracks. In addition, it can be used for newly-constructed civil engineering work or construction work for the purpose of shortening the construction period.

Claims (3)

クエン酸及び酒石酸アルカリ金属塩を含有するセメント混和剤。 A cement admixture containing citric acid and an alkali metal tartrate. 酒石酸アルカリ金属塩の含有量が、クエン酸１００重量部に対し１０〜２５０重量部である請求項１記載のセメント混和剤。   The cement admixture according to claim 1, wherein the content of the alkali metal tartrate is 10 to 250 parts by weight per 100 parts by weight of citric acid. 速硬性セメントを主成分とし、請求項１又は２記載のセメント混和剤を含有する速硬性セメント組成物。   A fast-setting cement composition comprising a quick-setting cement as a main component and containing the cement admixture according to claim 1 or 2.
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JP2006273700A (en) * 2005-03-30 2006-10-12 Sumitomo Osaka Cement Co Ltd Flowability improving method of super-quick hardening concrete and flowability improving agent for super-quick hardening concrete
JP2009082861A (en) * 2007-10-02 2009-04-23 Takuma Co Ltd Effluent suppressing method for heavy metal containing hexavalent chromium in ash
JP2016183057A (en) * 2015-03-25 2016-10-20 太平洋セメント株式会社 Cement composition
JP2018199940A (en) * 2017-05-26 2018-12-20 大成建設株式会社 Construction method of layered structure, layered structure and construction equipment for layered structure
JP2019178024A (en) * 2018-03-30 2019-10-17 住友大阪セメント株式会社 Ultrarapid hardening cement composition, mortar composition, and concrete composition

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JP2006273700A (en) * 2005-03-30 2006-10-12 Sumitomo Osaka Cement Co Ltd Flowability improving method of super-quick hardening concrete and flowability improving agent for super-quick hardening concrete
JP4583220B2 (en) * 2005-03-30 2010-11-17 住友大阪セメント株式会社 Method for improving fluidity of ultrafast hard concrete and fluidity improver for ultrafast concrete
JP2009082861A (en) * 2007-10-02 2009-04-23 Takuma Co Ltd Effluent suppressing method for heavy metal containing hexavalent chromium in ash
JP2016183057A (en) * 2015-03-25 2016-10-20 太平洋セメント株式会社 Cement composition
JP2018199940A (en) * 2017-05-26 2018-12-20 大成建設株式会社 Construction method of layered structure, layered structure and construction equipment for layered structure
JP6993794B2 (en) 2017-05-26 2022-01-14 大成建設株式会社 Laminated structure construction method, laminated structure and laminated structure construction equipment
JP2019178024A (en) * 2018-03-30 2019-10-17 住友大阪セメント株式会社 Ultrarapid hardening cement composition, mortar composition, and concrete composition

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