JPH1112013A - Cement mixture of low selfcontractility and method for lowering self-contractility of set cement - Google Patents
Cement mixture of low selfcontractility and method for lowering self-contractility of set cementInfo
- Publication number
- JPH1112013A JPH1112013A JP17517297A JP17517297A JPH1112013A JP H1112013 A JPH1112013 A JP H1112013A JP 17517297 A JP17517297 A JP 17517297A JP 17517297 A JP17517297 A JP 17517297A JP H1112013 A JPH1112013 A JP H1112013A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- shrinkage
- self
- amount
- contractility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】モルタルやコンクリート等の
セメント系材料の硬化時における収縮を低減させる低自
己収縮性セメント混和物およびセメント硬化体の自己収
縮低減方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low self-shrinkage cement admixture for reducing shrinkage of a cement-based material such as mortar or concrete during hardening, and to a method for reducing auto-shrinkage of a hardened cement body.
【０００２】[0002]
【従来の技術】近年、コンクリートの高機能化に伴い、
高流動コンクリートや高強度コンクリートといった結合
材の多いコンクリートが使用されている。また、環境保
全やリサイクルの観点から、セメント組成物に高炉スラ
グやシリカフュームといった産業副産物の利用も促進さ
れつつある。2. Description of the Related Art In recent years, with the increasing functionality of concrete,
Concrete with a large amount of binder such as high-fluidity concrete and high-strength concrete is used. From the viewpoint of environmental protection and recycling, the use of industrial by-products such as blast furnace slag and silica fume in cement compositions is also being promoted.
【０００３】しかしながら、これらのコンクリートは優
れた性状を有する反面、コンクリートの自己収縮が増加
するという問題点を有している。更に、マスコンクリー
トにおいても、温度応力のみでは説明できないひび割れ
の発生事例が報告されており、このひび割れの発生にも
自己収縮が大きく影響している可能性が指摘されてい
る。However, while these concretes have excellent properties, they have a problem that the self-shrinkage of the concrete increases. Furthermore, in mass concrete, cracks that cannot be explained only by temperature stress have been reported, and it has been pointed out that self-shrinkage may have a large effect on the occurrence of cracks.
【０００４】モルタルあるいはコンクリート等のセメン
ト系材料に生じる自己収縮は、セメントの水和反応によ
る凝結の始発以後に巨視的に生じる体積減少のことであ
り、物質の侵入や逸散、温度変化、外力や外部拘束に起
因する体積変化等は含まれない。この自己収縮は、水和
収縮に伴うセメント硬化体内部の空隙の形成とともに水
分の移動が起こり、その際にメニスカスに生じる毛細管
張力が駆動力となって生じるといわれている。そして、
凝結によりセメント硬化体の骨格が形成された後は、水
和反応の進行によって硬化体には空隙（水隙および練り
混ぜ直後から存在する気泡は含まない）が新たに形成さ
れ、巨視的には体積減少率が小さくなる。[0004] Self-shrinkage that occurs in cement-based materials such as mortar or concrete is a volume reduction that occurs macroscopically after the onset of setting due to the hydration reaction of cement, and the intrusion and dissipation of substances, temperature changes, and external forces. And changes in volume due to external constraints are not included. It is said that the self-shrinkage causes the movement of water along with the formation of voids inside the hardened cement body due to the hydration shrinkage, and the capillary force generated in the meniscus at that time acts as a driving force. And
After the skeleton of the hardened cement is formed by setting, voids (excluding water gaps and bubbles existing immediately after mixing) are newly formed in the hardened body by the progress of the hydration reaction, and macroscopically, The volume reduction rate decreases.
【０００５】従来のコンクリート硬化時における自己収
縮を低減させる方法としては、(1) クリンカー中に含有
されるＣ3 Ａ（アルミネート相），Ｃ4 ＡＦ（フェライ
ト相）等の間隙質を低減させたセメントを使用する、
(2) セメント中の石膏量を増加させる、(3) 膨張材を使
用する、(4) 撥水性混和剤を使用する、(5) アルキレン
オキシド系収縮低減剤を使用する、(6) 前記の収縮低減
剤と膨張材とを併用する等の方法があった。[0005] Conventional methods for reducing self-shrinkage during hardening of concrete include (1) reducing pore quality such as C 3 A (aluminate phase) and C 4 AF (ferrite phase) contained in clinker. Use cement,
(2) increasing the amount of gypsum in the cement, (3) using an expanding material, (4) using a water-repellent admixture, (5) using an alkylene oxide-based shrinkage reducing agent, (6) There has been a method in which a shrinkage reducing agent and an expanding material are used in combination.
【０００６】〔従来技術の問題点〕しかし、これらの方
法では、各々、以下のような問題点を有していた。前記
(1) の場合ではビーライトセメント( Belite Cement )
等の高価なセメントが必要になる。前記(2) だけでは目
的とする自己収縮の低減を達成することができない。前
記(3) だけでは自己収縮の低減には限界がある。前記
(4) の場合では撥水性混和材料が高価である。前記(5)
の場合は、通常の石膏量では、単独使用による自己収縮
低減効果に限界がある。前記(6) の場合は収縮低減剤及
び膨張材等に高価な材料を併用しなければならない。[Problems of the prior art] However, each of these methods has the following problems. Said
(1) In case of Belite Cement
Expensive cement is required. The objective reduction of self-shrinkage cannot be achieved only by the above (2). There is a limit to the reduction of self-shrinkage by the above (3) alone. Said
In the case of (4), the water-repellent admixture is expensive. Said (5)
In the case of (1), there is a limit to the effect of reducing the self-shrinkage by using a single amount of gypsum alone. In the case of the above (6), expensive materials must be used in combination for the shrinkage reducing agent and the expanding material.
【０００７】[0007]
【発明が解決しようとする課題】本発明は従来技術に係
る問題点に鑑みてなされたものであり、前記問題点を解
消するため具体的に設定された課題は、比較的安価で入
手し易い材料を添加することにより、モルタルやコンク
リート等のセメント硬化体の自己収縮量を低減し、これ
に伴うひび割れの発生を防止し、セメント硬化体の耐久
性向上を可能ならしめる低自己収縮性セメント混和物お
よびセメント硬化体の自己収縮低減方法を提供すること
にある。SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art, and the problems specifically set to solve the above problems are relatively inexpensive and easily available. Addition of materials reduces the amount of self-shrinkage of hardened cement such as mortar and concrete, prevents the occurrence of cracks due to this, and improves the low self-shrinkage cement mixing that makes it possible to improve the durability of hardened cement. It is an object of the present invention to provide a method for reducing self-shrinkage of a product and a hardened cement.
【０００８】[0008]
【課題を解決するための手段】本発明における請求項１
に係る低自己収縮性セメント混和物は、硬化前のセメン
トペースト、モルタル、コンクリート等のセメント混和
物において、二水石膏と収縮低減剤とが併存することを
特徴とするものである。Means for Solving the Problems Claim 1 of the present invention
The low self-shrinkage cement admixture according to the above is characterized in that gypsum and a shrinkage reducing agent coexist in a cement admixture such as a cement paste, mortar, concrete or the like before hardening.
【０００９】請求項２に係る低自己収縮性セメント混和
物は、前記収縮低減剤としてポリオキシアルキレン誘導
体を用いたことを特徴とする。[0009] The low self-shrinkage cement admixture according to claim 2 is characterized in that a polyoxyalkylene derivative is used as the shrinkage reducing agent.
【００１０】請求項３に係る低自己収縮性セメント混和
物は、前記二水石膏の総量が全結合材に対して 2.5〜7.
0 重量％であり、前記ポリオキシアルキレン誘導体の総
量が全結合材に対して 2〜4 重量％であることを特徴と
する。The low self-shrinkage cement mixture according to claim 3 is characterized in that the total amount of the gypsum is 2.5 to 7.
0% by weight, and the total amount of the polyoxyalkylene derivative is 2 to 4% by weight based on the whole binder.
【００１１】請求項４に係るセメント硬化体の自己収縮
低減方法は、セメントペースト、モルタル、コンクリー
ト等におけるセメント混和物の成分調整時において、全
結合材に対して、二水石膏の総量を 2.5〜7.0 重量％、
収縮低減剤の総量を 2〜4 重量％に調整したことを特徴
とするものである。According to a fourth aspect of the present invention, there is provided a method for reducing the self-shrinkage of a hardened cement body, wherein the total amount of gypsum dihydrate is 2.5 to 2.5% with respect to all binders at the time of adjusting the components of the cement mixture in cement paste, mortar, concrete and the like. 7.0% by weight,
It is characterized in that the total amount of the shrinkage reducing agent is adjusted to 2 to 4% by weight.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態につい
て具体的に説明する。ただし、この実施の形態は、本発
明の趣旨をより良く理解させるために具体的に説明する
ものであって、特に指定のない限り、発明内容を限定す
るものではない。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. However, this embodiment is specifically described for better understanding of the gist of the present invention, and does not limit the contents of the invention unless otherwise specified.
【００１３】この実施の形態では、モルタルやコンクリ
ート等のセメント硬化体を形成させるセメント混和物
に、二水石膏と収縮低減剤とを所定の割合で併存させる
ことにより、効果的にコンクリートの自己収縮を低減さ
せることができるようにして従来技術の問題点を解消し
たものである。In this embodiment, the cement self-shrinkage of mortar, concrete or the like is effectively mixed with gypsum dihydrate and a shrinkage reducing agent in a predetermined ratio, thereby effectively reducing the self-shrinkage of concrete. The problem of the prior art has been solved by reducing the number of pixels.
【００１４】セメント系材料に生じる自己収縮は、水和
収縮に伴うセメント硬化体内部の空隙の形成と水分の移
動とが起こり、その際に、メニスカスに生じる毛細管張
力が駆動力となって生じるとされているから、収縮低減
剤の作用によりセメント硬化体の細孔溶液中の表面張力
を低減させて硬化時の収縮力を低減させるとともに、二
水石膏を意図的に増量してセメント硬化体の寸法安定性
を損なわない範囲で適当量のエトリンガイトを生成させ
ることにより、材齢初期における硬化体の急激な緻密化
を抑え、収縮低減剤と二水石膏との作用の相乗効果によ
ってセメント硬化体の初期膨張および空隙量ならびに細
孔溶液中の表面張力を制御して、自己収縮を効果的に減
少させるようにする。The self-shrinkage generated in the cement-based material is caused by the formation of voids inside the hardened cement body and the movement of water due to the hydration shrinkage, and the capillary force generated in the meniscus at this time as a driving force. Because of the effect of the shrinkage reducing agent, the surface tension in the pore solution of the cement hardened body is reduced by the action of the shrinkage reducing agent to reduce the shrinkage force at the time of hardening. By producing an appropriate amount of ettringite within a range that does not impair the dimensional stability, rapid densification of the cured body in the early age of the material is suppressed, and the synergistic effect of the action of the shrinkage reducing agent and dihydrate gypsum makes the cured cement body The initial swelling and void volume and surface tension in the pore solution are controlled to effectively reduce self-shrinkage.
【００１５】このような場合に使用される収縮低減剤と
しては、低級アルコールアルキレンオキシド付加物、グ
リコールエーテル・アミノアルコール誘導体、その他の
アルコール系収縮低減剤、低分子量アルキレンオキシド
共重合体、アリルエーテルと無水マレイン酸との共重合
体、ポリオキシアルキレン誘導体等を用いることができ
る。特に、収縮低減剤としてポリオキシアルキレン誘導
体を用いた場合には、二水石膏との共働により自己収縮
を従来法の半分程度に低減させることができるようにな
る。The shrinkage reducing agent used in such a case includes a lower alcohol alkylene oxide adduct, a glycol ether / amino alcohol derivative, other alcohol-based shrinkage reducing agents, a low molecular weight alkylene oxide copolymer, and allyl ether. A copolymer with maleic anhydride, a polyoxyalkylene derivative, or the like can be used. In particular, when a polyoxyalkylene derivative is used as a shrinkage reducing agent, self-shrinkage can be reduced to about half that of the conventional method by cooperation with gypsum.
【００１６】この場合のセメント混和物への配合量とし
ては、混和物に含まれる非接着性の粒子の間に介在して
接合性を発現する結合材の全量に対して、当該二水石膏
の総量が 2.5〜7.0 重量％またはＳＯ3 量に換算して
2.0〜4.0 重量％であること、また、ポリオキシアルキ
レン誘導体の総量が 2〜4 重量％であることが、自己収
縮をより効果的に低減させるために望ましい配合量であ
る。In this case, the amount of the dihydrate gypsum in the cement mixture is based on the total amount of the binder that expresses bonding by being interposed between the non-adhesive particles contained in the mixture. The total amount is 2.5-7.0% by weight or converted to SO 3
The amount of 2.0 to 4.0% by weight and the total amount of the polyoxyalkylene derivative of 2 to 4% by weight are desirable blending amounts for more effectively reducing the self-shrinkage.
【００１７】もし、ポリオキシアルキレン誘導体の総量
が２重量％より少ない場合には、二水石膏が添加されて
も、自己収縮が効果的に抑えられず、また、４重量％よ
り多くなるとセメント硬化体の強度低下を生じ、耐久性
が低下して好ましくない。そして、ポリオキシアルキレ
ン誘導体の存在下で、二水石膏の総量が 2.5重量％また
はＳＯ3 量に換算して 2.0重量％より少ない場合には自
己収縮が抑えられず、また、二水石膏の総量が7.0 重量
％またはＳＯ3 量に換算して4.0 重量％より多くなると
セメント硬化体の寸法安定性や耐久性が低下して好まし
くない。If the total amount of the polyoxyalkylene derivative is less than 2% by weight, autogenous shrinkage cannot be effectively suppressed even if gypsum is added, and if it exceeds 4% by weight, cement hardening will occur. Undesirably, the strength of the body is reduced, and the durability is reduced. If the total amount of gypsum is less than 2.5% by weight or less than 2.0% by weight in terms of SO 3 in the presence of the polyoxyalkylene derivative, autogenous shrinkage cannot be suppressed, and the total amount of gypsum If the content is more than 7.0% by weight or 4.0% by weight in terms of SO 3 , the dimensional stability and durability of the hardened cement are undesirably reduced.
【００１８】[0018]
【実施例】コンクリートの自己収縮が大きいといわれる
高炉スラグ微粉末を重量割合で普通ポルトランドセメン
トに対して１：１で混合した混合系の結合材を用い、表
１に示すコンクリートについて自己収縮を測定した。[Examples] The self-shrinkage of concrete shown in Table 1 was measured using a mixed material in which blast furnace slag fine powder, which is said to have a large autogenous shrinkage of concrete, was mixed at a weight ratio of 1: 1 with ordinary Portland cement. did.
【００１９】[0019]
【表１】 [Table 1]
【００２０】なお、ここで用いた普通ポルトランドセメ
ントおよび高炉スラグ微粉末の化学成分および物理性状
を表２に示す。表中では二水石膏の配合量をＳＯ3 量に
換算した場合で示すものとする。Table 2 shows the chemical components and physical properties of the ordinary portland cement and blast furnace slag fine powder used here. In the table, the amount of gypsum is shown in terms of the amount of SO 3 .
【表２】 （注記）粉末度の単位は ｃｍ2/ｇであり、 圧縮強さの単位は Ｎ／ｍｍ2 （ 10.2 ｋｇｆ／ｃｍ2 ）である。[Table 2] (Note) The unit of fineness is cm 2 / g, and the unit of compressive strength is N / mm 2 (10.2 kgf / cm 2 ).
【００２１】このコンクリートにおけるセメント混和物
の調整には、二水石膏の総量を全結合材に対して 0〜1
1.5重量％、またはＳＯ3 換算で 0.8〜6.0 重量％、ま
た、ポリオキシアルキレン誘導体の総量を全結合材に対
して 0〜4 重量％の範囲で選択して調整した。For the adjustment of the cement mixture in this concrete, the total amount of gypsum is 0 to 1 with respect to the total binder.
1.5 wt%, or 0.8 to 6.0 wt% in terms of SO 3 , and the total amount of the polyoxyalkylene derivative was selected and adjusted in the range of 0 to 4 wt% based on the total binder.
【００２２】自己収縮の測定方法は、 10 × 10 × 40
ｃｍの角柱供試体中央部に埋込型ひずみ計及び熱電対を
設置し、コンクリートの凝結の終結を確認した後に、水
分の逸散を防ぐためビニール袋とビニールテープで完全
密封した。測定は、ひずみ計からの測定信号値をデータ
ローガーで読み取り、当該測定値に較正係数を乗じ、更
に温度補正を加えた。測定期間は、始発時を基点とし、
材齢２８日とした。この期間内で、収縮量は全ケースに
おいてほぼ収束値に近づいていた。コンクリートの自己
収縮測定結果は、図１〜６に示す通りである。The method for measuring the self-shrinkage is 10 × 10 × 40
An embedded strain gauge and a thermocouple were installed at the center of the square prism specimen, and after confirming the termination of concrete setting, the sample was completely sealed with a plastic bag and a vinyl tape to prevent moisture from escaping. In the measurement, the measured signal value from the strain gauge was read by a data logger, the measured value was multiplied by a calibration coefficient, and the temperature was corrected. The measurement period is based on the first train,
The material age was 28 days. During this period, the contraction amount was almost approaching the convergence value in all cases. The results of measuring the self-shrinkage of concrete are as shown in FIGS.
【００２３】これらの結果によれば、以下の点が認めら
れる。図１および図４によれば、ポリオキシアルキレン
誘導体を無添加（０％）とした場合には二水石膏量を増
加しても自己収縮量は低減されず、二水石膏量を増加す
ると増加し、二水石膏量が 7〜11.5重量％で収縮量が略
等しくなる。According to these results, the following points are recognized. According to FIGS. 1 and 4, when the polyoxyalkylene derivative was not added (0%), the amount of autogenous shrinkage was not reduced even if the amount of gypsum was increased, and increased when the amount of gypsum was increased. When the amount of gypsum is 7 to 11.5% by weight, the amount of shrinkage becomes almost equal.
【００２４】図２〜４によれば、ポリオキシアルキレン
誘導体を添加した場合には、ポリオキシアルキレン誘導
体の添加量が１重量％未満では自己収縮量の低減は殆ど
ないが、添加量を増加すると自己収縮量は低減され、二
水石膏量の増加とともに自己収縮量の低減がより顕著と
なる。According to FIGS. 2 to 4, when the polyoxyalkylene derivative is added, if the amount of the polyoxyalkylene derivative is less than 1% by weight, the amount of self-shrinkage is hardly reduced. The amount of self-shrinkage is reduced, and the decrease in the amount of self-shrinkage becomes more remarkable as the amount of gypsum dihydrate increases.
【００２５】特に、図４によれば、ポリオキシアルキレ
ン誘導体と二水石膏とを変動させた場合には、ポリオキ
シアルキレン誘導体の添加量を増加させるほど自己収縮
量の低減効果が高まり、しかも二水石膏量の増加ととも
に自己収縮量の低減効果がより顕著となる。In particular, according to FIG. 4, when the polyoxyalkylene derivative and the gypsum are varied, the effect of reducing the amount of self-shrinkage increases with an increase in the amount of the polyoxyalkylene derivative. As the amount of water gypsum increases, the effect of reducing the amount of self-shrinkage becomes more significant.
【００２６】図５によれば、二水石膏を７重量％に固定
してポリオキシアルキレン誘導体の添加量を変動させる
と、ポリオキシアルキレン誘導体の増加に従って自己収
縮量が低減され、その自己収縮量は収束値に速い時点か
ら近づき、飽和状態に達するのが早まる傾向にある。According to FIG. 5, when the amount of the polyoxyalkylene derivative added is changed by fixing gypsum to 7% by weight, the amount of self-shrinkage decreases with the increase of the polyoxyalkylene derivative, and the amount of self-shrinkage increases. Tends to approach the convergence value from a point in time and reach the saturation state more quickly.
【００２７】また、図６に示すように、ポリオキシアル
キレン誘導体を４重量％、石膏含有量をＳＯ3 量で４重
量％と一定にした条件では、半水石膏や無水石膏に比較
して二水石膏を使用した場合の自己収縮量が最も少な
い。Further, as shown in FIG. 6, under the condition that the polyoxyalkylene derivative was 4 wt% and the gypsum content was constant at 4 wt% in SO 3 amount, as compared with hemihydrate gypsum and anhydrous gypsum. The least amount of self-shrinkage when using water gypsum.
【００２８】[0028]
【発明の効果】以上のように、本発明における請求項１
に係る低自己収縮性セメント混和物では、二水石膏と収
縮低減剤とを併存させたことによって、セメント硬化体
の自己収縮量を低減させて従来技術の問題点を解消し、
自己収縮に伴うひび割れの発生を防止するとともに耐久
性を向上させることができ、コンクリートの高機能化を
促進することができる。As described above, the first aspect of the present invention is as follows.
In the low self-shrinkage cement admixture according to the present invention, by coexisting dihydrate gypsum and a shrinkage reducing agent, the self-shrinkage amount of the hardened cement body is reduced, and the problem of the related art is solved.
It is possible to prevent the occurrence of cracks due to self-shrinkage and improve the durability, and to promote the enhancement of the functionality of concrete.
【００２９】請求項２に係る低自己収縮性セメント混和
物は、収縮低減剤としてポリオキシアルキレン誘導体を
用いたことによって、セメント硬化体の自己収縮量を従
来よりもおよそ半減させることができる。In the low self-shrinkage cement admixture according to the second aspect, the use of a polyoxyalkylene derivative as a shrinkage-reducing agent can reduce the amount of self-shrinkage of a hardened cement body by about half compared to the conventional one.
【００３０】請求項３に係る低自己収縮性セメント混和
物は、二水石膏の総量が全結合に対して 2.5〜7.0 重量
％、ポリオキシアルキレン誘導体の総量が全結合材に対
して2〜4 重量％としたことにより、セメント硬化体の
寸法安定性を損なわないで自己収縮量を効果的に低減す
ることができる。The low self-shrinkage cement admixture according to claim 3 is characterized in that the total amount of gypsum is 2.5 to 7.0% by weight based on the total bond, and the total amount of the polyoxyalkylene derivative is 2 to 4% by weight based on the total binder. By setting the percentage by weight, the amount of self-shrinkage can be effectively reduced without impairing the dimensional stability of the cured cement body.
【００３１】請求項４に係るセメント硬化体の自己収縮
低減方法では、セメント混和物の成分調整時において、
全結合材に対して、二水石膏の総量を 2.5〜7.0 重量
％、収縮低減剤の総量を 2〜4 重量％に調整したことに
よって、ポリオキシアルキレン誘導体と二水石膏との相
乗作用を利用して、硬化体の細孔溶液中の表面張力を低
減させるとともに硬化体の急激な緻密化を抑制し、セメ
ント硬化体の硬化時における初期膨張、空隙量、および
細孔溶液中の表面張力を適切に制御して、自己収縮量を
効果的に減少させることができる。In the method for reducing self-shrinkage of a hardened cement according to claim 4, when adjusting the components of the cement mixture,
By adjusting the total amount of gypsum to 2.5 to 7.0% by weight and the total amount of shrinkage reducing agent to 2 to 4% by weight to all binders, the synergistic effect of polyoxyalkylene derivative and gypsum is used. In addition to reducing the surface tension of the cured product in the pore solution and suppressing the rapid densification of the cured product, the initial expansion, the void volume, and the surface tension in the pore solution during curing of the cured cement product are reduced. With proper control, the amount of self-shrinkage can be effectively reduced.
【図１】本発明における実施例のポリオキシアルキレン
誘導体が０％の場合の経過時間に対するセメント硬化体
の自己収縮量測定結果を示すグラフである。FIG. 1 is a graph showing the results of measuring the amount of self-shrinkage of a cured cement body with respect to the elapsed time when the polyoxyalkylene derivative of the example in the present invention is 0%.
【図２】本発明における実施例のポリオキシアルキレン
誘導体が１重量％の場合の経過時間に対するセメント硬
化体の自己収縮量測定結果を示すグラフである。FIG. 2 is a graph showing the results of measuring the amount of self-shrinkage of a cured cement body with respect to the elapsed time when the polyoxyalkylene derivative of the example in the present invention is 1% by weight.
【図３】本発明における実施例のポリオキシアルキレン
誘導体が４重量％の場合の経過時間に対するセメント硬
化体の自己収縮量測定結果を示すグラフである。FIG. 3 is a graph showing the results of measuring the amount of self-shrinkage of a cured cement body with respect to the elapsed time when the polyoxyalkylene derivative of the example in the present invention is 4% by weight.
【図４】本発明における実施例の石膏含有量とポリオキ
シアルキレン誘導体含有量との変化に対するセメント硬
化体の自己収縮低減効果を示すグラフである。FIG. 4 is a graph showing the effect of reducing the self-shrinkage of a hardened cement body with respect to changes in the gypsum content and the polyoxyalkylene derivative content in Examples of the present invention.
【図５】本発明における実施例の二水石膏含有量が７重
量％の場合における経過時間に対するセメント硬化体の
自己収縮量測定結果を示すグラフである。FIG. 5 is a graph showing the results of measuring the amount of self-shrinkage of a hardened cement body with respect to the elapsed time when the content of gypsum is 7% by weight in the examples of the present invention.
【図６】本発明における実施例のポリオキシアルキレン
誘導体が４重量％であり、石膏がＳＯ3 換算で４重量％
と一定にした場合における、セメント硬化体の自己収縮
量に及ぼす石膏種類の影響を示すグラフである。FIG. 6 shows that the polyoxyalkylene derivative of the example in the present invention is 4% by weight, and the gypsum is 4% by weight in terms of SO 3.
7 is a graph showing the effect of gypsum type on the amount of autogenous shrinkage of a cement hardened material when the value is made constant.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 寺野 宜成 千葉県船橋市豊富町585番地 住友大阪セ メント株式会社セメントコンクリート研究 所内 (72)発明者 小田部 裕一 千葉県船橋市豊富町585番地 住友大阪セ メント株式会社セメントコンクリート研究 所内 (72)発明者 安本 礼持 千葉県船橋市豊富町585番地 住友大阪セ メント株式会社セメントコンクリート研究 所内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshinari Terano 585 Tomicho, Funabashi-shi, Chiba Sumitomo Osaka Cement Co., Ltd. Cement Cement Research Institute, Cement Co., Ltd.
Claims (4)
ンクリート等のセメント混和物において、二水石膏と収
縮低減剤とが併存することを特徴とする低自己収縮性セ
メント混和物。Claims: 1. A low self-shrinkage cement mixture, in which a cement mixture such as cement paste, mortar, concrete or the like before curing contains gypsum dihydrate and a shrinkage reducing agent.
ン誘導体を用いたことを特徴とする請求項１記載の低自
己収縮性セメント混和物。2. The low self-shrinkage cement admixture according to claim 1, wherein a polyoxyalkylene derivative is used as the shrinkage reducing agent.
2.5〜7.0 重量％であり、前記ポリオキシアルキレン誘
導体の総量が全結合材に対して 2〜4 重量％であること
を特徴とする請求項２記載の低自己収縮性セメント混和
物。3. The total amount of the gypsum is based on the total binder.
The low self-shrinkage cement admixture according to claim 2, wherein the amount is 2.5 to 7.0% by weight, and the total amount of the polyoxyalkylene derivative is 2 to 4% by weight based on the total binder.
ト等におけるセメント混和物の成分調整時において、全
結合材に対して、二水石膏の総量を 2.5〜7.0 重量％、
収縮低減剤の総量を 2〜4 重量％に調整したことを特徴
とするセメント硬化体の自己収縮低減方法。4. When adjusting the composition of a cement mixture in a cement paste, mortar, concrete, etc., the total amount of gypsum dihydrate is 2.5 to 7.0% by weight, based on all binders.
A method for reducing the self-shrinkage of a hardened cement, wherein the total amount of the shrinkage reducing agent is adjusted to 2 to 4% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17517297A JP3174745B2 (en) | 1997-06-17 | 1997-06-17 | Low self-shrinkage cement-based material and method for reducing self-shrinkage of hardened cement body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17517297A JP3174745B2 (en) | 1997-06-17 | 1997-06-17 | Low self-shrinkage cement-based material and method for reducing self-shrinkage of hardened cement body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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| JP3174745B2 JP3174745B2 (en) | 2001-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005281008A (en) * | 2004-03-26 | 2005-10-13 | Hokkaido Technology Licence Office Co Ltd | Shrinkage reducing composition for hydraulic material |
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|---|---|---|---|---|
| KR100591698B1 (en) | 1999-01-29 | 2006-06-20 | 아라까와 가가꾸 고교 가부시끼가이샤 | Hardener for epoxy resin, epoxy resin composition, and process for producing silane-modified phenolic resin |
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1997
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005281008A (en) * | 2004-03-26 | 2005-10-13 | Hokkaido Technology Licence Office Co Ltd | Shrinkage reducing composition for hydraulic material |
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