JPH04130036A - Cement admixture and cement composition - Google Patents

Cement admixture and cement composition

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Publication number
JPH04130036A
JPH04130036A JP2246708A JP24670890A JPH04130036A JP H04130036 A JPH04130036 A JP H04130036A JP 2246708 A JP2246708 A JP 2246708A JP 24670890 A JP24670890 A JP 24670890A JP H04130036 A JPH04130036 A JP H04130036A
Authority
JP
Japan
Prior art keywords
cement
admixture
expandable
surface area
specific surface
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.)
Pending
Application number
JP2246708A
Other languages
Japanese (ja)
Inventor
Keiichi Kosuge
啓一 小菅
Etsuro Sakai
悦郎 坂井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denka Co Ltd
Original Assignee
Denki Kagaku Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denki Kagaku Kogyo KK filed Critical Denki Kagaku Kogyo KK
Priority to JP2246708A priority Critical patent/JPH04130036A/en
Publication of JPH04130036A publication Critical patent/JPH04130036A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

PURPOSE:To provide the cement compsn. which shrinks less in an initial period by using the expandable admixture having a specific surface area. CONSTITUTION:This cement admixture consists essentially of the expandable admixture having >=2m<2>/g specific surface area and superfine powder. The expandable admixture is ground to >=2m<2>/g specific surface area and is an haveyne ore system, CaO system, calcined alum system, Ca aluminate and CaSO4 mixture system which are crystalline or amorphous or the mixture composed thereof, and CaSO4 system, which are the expandable hydrate in reaction and form ettringite and Ca(OH)2, and also includes iron powder, etc., which form hydroxide. Among these materials, the haveyne system and the CaO system are more preferable in terms of safety. The silica dust and siliceous dust to be byproduced at the time of production of silicon, silicon-contg. alloy, zirconia, etc., are adequate as the superfine powder and CaCO3, silica gel, Al2O3 etc., are usable as well.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、初期の収縮特性の改善されたセメント混和材
及びセメント組成物に関するものであり詳しくは、高品
質、高耐久性及び高強度のモルタルやコンクリート、さ
らにはグラウト材などに使用されるセメント混和材及び
セメント組成物に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to cement admixtures and cement compositions with improved initial shrinkage characteristics. The present invention relates to cement admixtures and cement compositions used in mortar, concrete, grout, etc.

〔従来の技術とその課題〕[Conventional technology and its issues]

従来、セメント質物質、超微粉及び高性能減水剤を組み
合わせることにより、非常に少ない水セメント比で、流
動性を確保することが可能な組成物が知られている（特
公昭６０−５９１８２号公報）。Conventionally, compositions have been known that can ensure fluidity with a very low water-to-cement ratio by combining a cementitious material, an ultrafine powder, and a high-performance water reducing agent (Japanese Patent Publication No. 60-59182). ).

また、モルタルやコンクリートなどの収縮を防止する方
法として、有機質乾燥収縮低減剤を添加する方法が知ら
れている（特開昭５９−２１５５７公報）。Furthermore, as a method of preventing shrinkage of mortar, concrete, etc., a method of adding an organic drying shrinkage reducing agent is known (Japanese Patent Application Laid-Open No. 59-21557).

しかしながら、これら組成物や有機質乾燥収縮低減剤で
は初期の収縮が大きく、それにともなうひび割れの発生
や、特にグラウト材や鉄筋継ぎ手充填材などでは、充填
後の収縮により透き間が生じるなどの課題が生じていた
。However, with these compositions and organic drying shrinkage reducers, initial shrinkage is large, resulting in cracks, and especially in grout materials and reinforcing bar joint fillers, problems such as the formation of gaps due to shrinkage after filling have occurred. Ta.

本発明者らは、以上のような課題を解決すべく種々検討
を加えた結果、この収縮が主に水和反応にともなう化学
収縮であることを知見し、特定の比表面積を有する膨張
性混和材を使用することにより前記課題を解決し、初期
収縮の少ないセメント組成物の提供か可能であることを
見出し本発明を完成に至った。As a result of various studies to solve the above-mentioned problems, the present inventors found that this shrinkage is mainly chemical shrinkage due to hydration reaction, and found that an expandable miscible compound with a specific specific surface area. The inventors have discovered that it is possible to solve the above-mentioned problems and provide a cement composition with less initial shrinkage by using a cement composition using the above-described materials, and have completed the present invention.

〔課題を解決する手段〕[Means to solve problems]

即ち、本発明は、比表面積が２　ｒｒｒ／ｇ以上の膨張
性混和材と超微粉を必須成分とするセメント混和材であ
り、該膨張性混和材と有機質セメント収縮低減剤を必須
成分とするセメント混和材であり、さらには、セメント
質物質とそれらセメント混和材を主成分とするセメント
組成物である。That is, the present invention is a cement admixture that contains an expansive admixture with a specific surface area of 2 rrr/g or more and ultrafine powder as essential components, and a cement that contains the expansive admixture and an organic cement shrinkage reducing agent as essential components. It is an admixture, and furthermore, it is a cement composition whose main components are cementitious substances and these cement admixtures.

以下、本発明の詳細な説明する。The present invention will be explained in detail below.

本発明に係る膨張性混和材とは、比表面積が２イ／ｇ以
上のものであり、アライン鉱物系、酸化カルシウム系、
仮焼ミョウバン系、結晶質や非晶質の、あるいは両者の
混合物であるカルシウムアルミネートとＣａＳＯ４の混
合系及びＣａＳＯ４系等のように、反応により膨張性水
和物であるエトリンガイトやＣａ（ＯＨ）、を生成する
ものであり、また、鉄粉などのように水酸化物を生成す
るものも含まれる。このうち、膨張材として通常使用さ
れているアライン鉱物系や酸化カルシウム系の使用がそ
の安全性の面から好ましく、各々、電気化学工業■装面
品名［デンカＣ３ＡＪや小野田セメント■製商品名「オ
ノダエクスパン」などとして市販されているものか使用
可能である。The expandable admixture according to the present invention has a specific surface area of 2 i/g or more, and has an alignment mineral type, a calcium oxide type,
Ettringite and Ca(OH), which are expandable hydrates by reaction, such as calcined alum, crystalline or amorphous, or a mixture of calcium aluminate and CaSO4, and CaSO4, etc. , and also includes those that produce hydroxides, such as iron powder. Among these, it is preferable to use Align mineral type and calcium oxide type, which are commonly used as expansion materials, from the viewpoint of safety. You can use commercially available products such as "Expan".

本発明に係る膨張性混和材は、粉砕して、比表面積を大
としたものである。通常、市販の膨張材のガス吸着法に
よる比表面積は、２　ｒｄ／ｇを越えることはないが、
本発明に係る膨張性混和材の比表面積は２　ｒｒｒ／ｇ
以上であり、３　ｒｒｆ／ｇ以上か好ましい。The expandable admixture according to the present invention is pulverized to have a large specific surface area. Normally, the specific surface area of commercially available inflatable materials measured by gas adsorption method does not exceed 2 rd/g.
The specific surface area of the expandable admixture according to the present invention is 2 rrr/g
or more, and preferably 3 rrf/g or more.

膨張性混和材の使用量は、一般には、セメント質物質７
５〜９９重量部に対して、１〜２５重量部程度か好まし
い。１重量部未満では収縮を低減する効果は少なく、２
５重量部を越えると、長期において膨張破壊を生じる可
能性かある。The amount of expansive admixture used is generally 7
It is preferably about 1 to 25 parts by weight relative to 5 to 99 parts by weight. If it is less than 1 part by weight, the effect of reducing shrinkage is small;
If it exceeds 5 parts by weight, there is a possibility that expansion failure will occur over a long period of time.

本発明に係るセメント質物質としては、普通・早強・超
早強・耐硫酸塩及び白色等の各種ポルトランドセメント
、これらポルトランドセメントにシリカや高炉スラグな
どのポゾラン物質を混合した各種混合セメント、アルミ
ナセメント、さらには、低発熱や超低発熱セメント等が
挙げられる。The cementitious materials according to the present invention include various types of Portland cement such as normal, early strength, super early strength, sulfate resistant, white, etc., various mixed cements in which these Portland cements are mixed with pozzolanic substances such as silica and blast furnace slag, and alumina. Examples include cement, and further examples include low heat generation cement and ultra-low heat generation cement.

本発明に係る超微粉とは、平均粒径か通常１０〜２０μ
ｍ程度のセメント質物質よりも少なくとも１オーダー低
いものであり、特に、平均粒径が２オーダー程度低いも
のが好ましい。The ultrafine powder according to the present invention has an average particle size of usually 10 to 20 μm.
The average particle size is at least one order of magnitude lower than that of the cementitious material of the order of m, and in particular, those having an average particle size of about two orders of magnitude lower are preferred.

超微粉としては、シリコン、含シリコン合金ならびにジ
ルコニアなどを製造する際に副生ずるシリカダスト（シ
リカヒユーム）やシリカ質ダストか好適であり、炭酸カ
ルシウム、シリカゲル、オパール質珪石、酸化チタン及
び酸化アルミニウム等も使用可能である。このような、
超微粉の製造は、シリカダストのように気相で生成する
以外に、分級器と粉砕機を組み合わせて粉砕する方法も
ある。Suitable ultrafine powders include silica dust (silica fume) and siliceous dust, which are produced as by-products during the production of silicon, silicon-containing alloys, zirconia, etc., as well as calcium carbonate, silica gel, opal silica, titanium oxide, and aluminum oxide. Available for use. like this,
In addition to producing ultrafine powder in a gas phase like silica dust, there are other methods for producing ultrafine powder using a classifier and a pulverizer.

また、粉砕工程でバグフィルタ−により回収すると、よ
り粒径の細かいものを得ることができる。Furthermore, if the particles are collected using a bag filter during the pulverization process, particles with finer particle sizes can be obtained.

このような超微粉としては、高炉水砕スラグやフライア
ッシュなどの産業副産物の微粉砕品が経済性の面からも
有用である。As such ultrafine powder, finely pulverized products of industrial by-products such as granulated blast furnace slag and fly ash are useful from the economic point of view.

超微粉の使用量は、セメント質物質６０〜９５重量部に
対して、５〜４０重量部である。５重量部未満では高強
度又は堅牢性を得ることが困難であり、４０重量部を越
えると混線物の流動性が著しく低下し、成型することが
困難となり、かつ、強度発現も不十分となる傾向がある
。The amount of ultrafine powder used is 5 to 40 parts by weight based on 60 to 95 parts by weight of the cementitious material. If it is less than 5 parts by weight, it is difficult to obtain high strength or robustness, and if it exceeds 40 parts by weight, the fluidity of the mixed material will be significantly reduced, making it difficult to mold, and the strength development will be insufficient. Tend.

また、超微粉に、高性能減水剤を併用することは、高強
度を得る面から好ましい。Further, it is preferable to use a high performance water reducing agent together with the ultrafine powder from the viewpoint of obtaining high strength.

ここで使用する高性能減水剤とは、セメントに多量添加
しても凝結の過遅延や過度の空気連行を伴わない分散能
力の大きな界面活性剤であって、ナフタリンスルホン酸
塩、メラミン樹脂スルホン酸塩及びポリカルボン酸塩等
を主成分とするものがあげられる。The high-performance water reducing agent used here is a surfactant with a large dispersion ability that does not cause too much delay in setting or excessive air entrainment even when added to cement in large quantities, and includes naphthalene sulfonate, melamine resin sulfonate, etc. Examples include those whose main components are salts and polycarboxylic acid salts.

高性能減水剤の使用量は、セメント質物質、超微粉及び
膨張性混和材の合計１００重量部に対して固形分換算で
１０重量部程度までが好ましく、１〜５重量部がより好
ましい。それよりも多量に使用すると硬化反応にかえっ
て悪影響を与える傾向がある。The amount of the high-performance water reducing agent used is preferably up to about 10 parts by weight, more preferably 1 to 5 parts by weight, in terms of solid content, based on a total of 100 parts by weight of the cementitious material, ultrafine powder, and expandable admixture. If larger amounts are used, they tend to adversely affect the curing reaction.

本発明に係る有機質セメント収縮低減剤（以下収縮低減
剤という）としては、 一般式Ｉ＝Ｒ，Ｏ（Ｒ２０）ｎＨ で示される化合物（式中Ｒ８は炭素数１〜７のアルキル
基又は炭素数５〜６のシクロアルキル基、Ｒ２は炭素数
２〜８の一種又は二種以上のアルキレン基、ｎは１〜１
０の整数である）や、一般式Ｉ［＝ＲＯ［（（ＡＯ）ａ
（Ｃ２Ｈ４０）ｂ）　Ｈ］ｍて示される化合物（式中Ｒ
はｍ個の活性水素を持つ化合物の残基、ＡＯはオキシプ
ロピレン基及び／又はオキシブチレン基を示し、ｍＸ２
〜８の整数であり、ｍｘａ＝１〜１０ｍ１ｍＸｂ−１〜
ｌ。The organic cement shrinkage reducing agent (hereinafter referred to as a shrinkage reducing agent) according to the present invention is a compound represented by the general formula I=R,O(R20)nH (wherein R8 is an alkyl group having 1 to 7 carbon atoms or a carbon number 5-6 cycloalkyl group, R2 is one or more alkylene groups having 2-8 carbon atoms, n is 1-1
is an integer of 0), or the general formula I[=RO[((AO)a
(C2H40)b) A compound represented by H]m (in the formula R
is the residue of a compound having m active hydrogens, AO represents an oxypropylene group and/or oxybutylene group, mX2
~8 integer, mxa=1~10m1mXb-1~
l.

ｍである）からなる群より選ばれた一種又は二種以上か
使用可能である。It is possible to use one or more selected from the group consisting of m).

一般式ＩのＲ７としては、例えば、メチル基、エチル基
、ノルマルプロピル基、イソプロピル基、ノルマルブチ
ル基、イソブチル基、ノルマルペンチル基、イソペンチ
ル基、シクロペンチル基、シクロヘキシル基、ノルマル
ヘキシル基、イソヘキシル基、ノルマルヘプチル基及び
イソヘプチル基等が挙げられる。R7 in general formula I is, for example, a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, an isobutyl group, a normal pentyl group, an isopentyl group, a cyclopentyl group, a cyclohexyl group, a normal hexyl group, an isohexyl group, Examples include normal heptyl group and isoheptyl group.

一方、Ｒ２としては、例えば、エチレン基やプロピレン
基などが挙げられる。具体的な化合物としては、ＣＨ３
０（Ｃ２Ｈ４０）ｓＨ，ＣＨ，０（Ｃ２ＨｇＯ）２Ｈ１
ｎ−Ｃ４ＨｓＯ（Ｃ２ＨｎＯ）３Ｈ，１−ｃ３Ｈ７ｏ（
ｃ２Ｈ４ｏ）４Ｈ。On the other hand, examples of R2 include ethylene group and propylene group. As a specific compound, CH3
0(C2H40)sH,CH,0(C2HgO)2H1
n-C4HsO(C2HnO)3H,1-c3H7o(
c2H4o)4H.

Ｃ２Ｈ３（Ｃ２Ｈ，０）４（Ｃ３Ｈ，０）、Ｈ，（Ｉン
０（Ｃ２Ｈ４０）、Ｈｌｎ−Ｃｓｌ’Ｌ　１０（Ｃ２Ｈ
４０）　２Ｈ及び１−ＣＪ＋　５０（Ｃ２Ｈ４０）　５
Ｈ等か挙げられる。C2H3(C2H,0)4(C3H,0),H,(Iin0(C2H40),Hln-Csl'L 10(C2H
40) 2H and 1-CJ+ 50 (C2H40) 5
H etc. can be mentioned.

また、一般式■に属する化合物は、２〜８個の活性水素
を有する化合物に、エチレンオキシドとプロピレンオキ
シド及び／又はブチレンオキシドとをランダム状又はブ
ロック状に付加させることにより容易に得ることが可能
である。Furthermore, compounds belonging to the general formula (■) can be easily obtained by adding ethylene oxide, propylene oxide, and/or butylene oxide in a random or block manner to a compound having 2 to 8 active hydrogen atoms. be.

ここで、２〜８個の活性水素を有する化合物としては、
エチレングリコール、プロピレングリコール、ネオペン
チルグリコール、ヘキシレングリコール、グリセリン、
トリメチロールプロパン、１．３．５−ペンタントリオ
ール、ソルビトール、ソルビタン、マンノース、キシロ
ース、グルコース、フラクトース、シュークロース及び
トレハロース等の多価アルコール類、アンモニア、エチ
レンジアミン、メチルアミン並びにエチルアミン等が挙
げられる。Here, as a compound having 2 to 8 active hydrogens,
Ethylene glycol, propylene glycol, neopentyl glycol, hexylene glycol, glycerin,
Examples include polyhydric alcohols such as trimethylolpropane, 1,3,5-pentanetriol, sorbitol, sorbitan, mannose, xylose, glucose, fructose, sucrose, and trehalose, ammonia, ethylenediamine, methylamine, and ethylamine.

具体的な化合物の例として、２〜８個の活性水素を有す
る化合物かエチレングリコールの場合は、ＨＯ（（Ｃ２
Ｈ４０）ｂｌ（ＡＯ）ａ＋）　ＣＨ２ＣＨ２Ｏ（（ＡＯ
）ａ２（Ｃ２Ｈ，）ｂ２）なる化合物か挙げられる。こ
こでａ、＋ａ２＝＝　１〜２０、ｂｌ＋ｂ２＝１〜２０
であり、ａｌあるいはａ２の一方か０の場合も含まれる
。As a specific example of a compound, in the case of a compound having 2 to 8 active hydrogens or ethylene glycol, HO((C2
H40)bl(AO)a+) CH2CH2O((AO
)a2(C2H,)b2). Here a, +a2== 1~20, bl+b2=1~20
This also includes the case where either al or a2 is 0.

また、グリセリンの場合には、次式に示す化合物が挙げ
られる。In addition, in the case of glycerin, compounds represented by the following formula may be mentioned.

ＣＨ２Ｏ（（ＡＯ）ａ、（Ｃ２Ｈ，０）ｂｌ）　ＨＣＨ
２０（（ＡＯ）ａ２（Ｃ２Ｈ４０）ｂ２）　ＨＣＨ２０
（（ＡＯ）ａ３（Ｃ２Ｈ，０）ｂｓ）　Ｈここでａ＋＋
ａ２＋ａ３”　１〜３０、ｂ１＋ｂ２＋ｂ３＝１〜３０
てあり、ａＩｓａ２及びａ３のうち１個あるいは２個が
０、ｂｌ、ｂ２及びｂ３のうち１個あるいは２個か０の
場合も含まれる。CH2O((AO)a,(C2H,0)bl) HCH
20 ((AO)a2(C2H40)b2) HCH20
((AO)a3(C2H,0)bs) H where a++
a2+a3” 1~30, b1+b2+b3=1~30
This also includes cases where one or two of aIsa2 and a3 are 0, and one or two of bl, b2, and b3 are 0.

さらにペンタエリスリトールの場合は、次式に示す化合
物が挙げられる。Further, in the case of pentaerythritol, compounds represented by the following formula may be mentioned.

＋　＋でａ１＋ａｚ＋ａｚ＋ａ＊＝　１〜４０Ｓｂ＋＋
ｂ２＋ｂｓ＋ｂ４＝１〜４０であり、ａｌ〜ａ４のうち
１個〜３個が０、ｂ１〜ｂ４のうち１〜３個が０の場合
も含まれる。+ with a1+az+az+a*= 1~40Sb++
b2+bs+b4=1 to 40, including the case where one to three of al to a4 are 0 and one to three of b1 to b4 are 0.

収縮低減剤の使用量は、セメント質物質、膨張性混和材
及び超微粉の合計１００重量部に対して、０．０５〜１
０重量部が好ましい。０．０５重量部未満ではひび割れ
防止効果は少なく、１０重量部を越えると強度が低下す
る傾向がある。The amount of shrinkage reducing agent used is 0.05 to 1 part by weight per 100 parts by weight of the cementitious material, expandable admixture, and ultrafine powder.
0 parts by weight is preferred. If the amount is less than 0.05 parts by weight, the effect of preventing cracking is small, and if it exceeds 10 parts by weight, the strength tends to decrease.

さらに必要に応じ、骨材を併用することも可能である。Furthermore, it is also possible to use aggregate as necessary.

骨材は、一般の砂や砂利でも可能であるが、モース硬度
６以上又はヌープ圧子硬度７００Ｋｇｆ／ｍｍ’以上の
基準で選定された硬質骨材を使用すれば、強度や弾性率
の向上に極めて有効である。General sand or gravel can be used as the aggregate, but if you use hard aggregate selected based on Mohs hardness of 6 or higher or Knoop indenter hardness of 700 Kgf/mm' or higher, strength and elastic modulus will be significantly improved. It is valid.

硬質骨材としては、珪石、黄鉄鉱、赤鉄鉱、磁鉄鉱、黄
玉、ローソン石、コランダム、フエナサイト、スピネル
、緑柱石、電気石、花崗岩、十字石、ジルコン、焼成ボ
ーキサイト、炭化ホウ素及びフェロクロムスラグ等が挙
げられる。また、鉄やステンレスなどの金属粉の使用も
有効である。Examples of hard aggregates include silica, pyrite, hematite, magnetite, yellow jade, lawsonite, corundum, fenasite, spinel, beryl, tourmaline, granite, cross stone, zircon, calcined bauxite, boron carbide, and ferrochrome slag. It will be done. It is also effective to use metal powder such as iron or stainless steel.

また、高炉スラグやフライアッシュなどの混和材、促進
剤や遅延剤等の混和剤、さらには、各種繊維や鉄筋その
他の補強材等を組み合わせて使用することも可能である
。Further, it is also possible to use a combination of admixtures such as blast furnace slag and fly ash, admixtures such as accelerators and retarders, and various reinforcing materials such as fibers and reinforcing bars.

繊維としては、鋳鉄のびびり切削法による繊維、スチー
ル繊維及びステンレス繊維等の金属繊維、石綿、セラミ
ックファイバー、ポリプロピレンなどの合成樹脂繊維及
びアルミナ繊維等の各種天然又は合成鉱物繊維、炭素繊
維並びにガラス繊維等が挙げられる。Fibers include fibers produced by chatter cutting of cast iron, metal fibers such as steel fibers and stainless steel fibers, various natural or synthetic mineral fibers such as asbestos, ceramic fibers, synthetic resin fibers such as polypropylene, and alumina fibers, carbon fibers, and glass fibers. etc.

補強材としては、従来より用いられている鋼棒やアルミ
ナ繊維による成型体などを用いることが可能であり、特
に、大型のものにはこれら補強材がしばしば必要となる
。As the reinforcing material, it is possible to use conventionally used steel rods, molded bodies of alumina fibers, etc., and these reinforcing materials are often necessary, especially for large-sized products.

以上の材料に水を加えて混線物を得る。Add water to the above ingredients to obtain a mixed substance.

水の使用量は、セメント質物質、膨張性混和材及び超微
粉の合計１００重量部に対して１３〜３５重量部か好ま
しく、高強度という面から２０〜２７重量部かより好ま
しい。The amount of water used is preferably 13 to 35 parts by weight, and more preferably 20 to 27 parts by weight, based on the total of 100 parts by weight of the cementitious material, expandable admixture, and ultrafine powder.

混練方法は、特に限定されるものではなく、十分に混練
出来ればよい。例えば、モルタルミキサ、コンクリート
ミキサー、ハンドミキサー及びオムニミキサー等か使用
可能である。The kneading method is not particularly limited as long as it can be sufficiently kneaded. For example, a mortar mixer, concrete mixer, hand mixer, omni mixer, etc. can be used.

〔実施例〕〔Example〕

以下、実施例により本発明をさらに詳しく説明する。 Hereinafter, the present invention will be explained in more detail with reference to Examples.

実施例１ セメント質物質８３重量部、高性能減水剤１．５重量部
、砂１２２重量部、水３５重量部及び超微粉１７重量部
と、表−１に示す配合を用いてモルタルを調整した。Example 1 Mortar was prepared using 83 parts by weight of cementitious material, 1.5 parts by weight of high performance water reducing agent, 122 parts by weight of sand, 35 parts by weight of water, and 17 parts by weight of ultrafine powder, using the formulation shown in Table 1. .

このモルタルを使用し、東京理工製自動硬化収縮測定装
置を用い、初期の硬化収縮量を測定した。Using this mortar, the amount of initial curing shrinkage was measured using an automatic curing shrinkage measuring device manufactured by Tokyo Riko.

一定温度になるように混練したモルタルを薄膜の岡本理
研ゴム社製ゴム袋に８０ｇ程度入れ封をし、水の満たさ
れた３００ｃｃの密閉容器中に入れ、内径１．５ｍｍの
キャピラリーとチューブで接続した。Approximately 80g of mortar was mixed to a constant temperature and placed in a thin film rubber bag manufactured by Okamoto Riken Rubber Co., Ltd., sealed, placed in a 300cc airtight container filled with water, and connected to a capillary with an inner diameter of 1.5mm using a tube. did.

ゴム袋中のモルタルが膨張や収縮をするとキャピラリー
中の水の界面が上下するので、これを光センサーにより
感知し、自動的にその動きを検出することにより、膨張
量や収縮量を測定した。When the mortar in the rubber bag expands or contracts, the interface with the water in the capillary moves up and down. This is sensed by an optical sensor, and by automatically detecting this movement, the amount of expansion and contraction was measured.

結果を表−１に併記する。The results are also listed in Table-1.

〈使用材料〉 セメント質物質：秩父セメント社製白色ポルトランドセ
メント、比重３．１５ 膨張性混和材α：電気化学工業社製商品名「デンカＣ３
ＡＪ　、濡洩アイオニックス製 表面積測定装置を用い、ガス吸着 法による比表面積１．３ポ／ｇ 〃　　　β：膨張性混和材Ａの粉砕品、比表面積　２．
５ポ／ｇ 〃　　　γ：膨張性混和材Ａの粉砕品、比表面積　４．
５ボ／ｇ 超微粉　　　　：日本重化製シリカヒユーム、比重２．
１ 高性能減水剤　：第一工業製薬製商品名「セルフロー１
１０ＰＪ 砂 ：珪砂 ７号、 比重 ２．６ 水 ：水道水 表 膨張性混和材は（重量部） 体積変化は（体積／体積％） 実施例２ 高性能減水剤１．５重量部、砂１２２重量部及び水３５
重量部と、表−２に示す配合を用いたこと以外は実施例
１と同様に行った。結果を表−２に併記する。<Materials used> Cementitious material: white Portland cement manufactured by Chichibu Cement Co., Ltd., specific gravity 3.15 Expandable admixture α: manufactured by Denki Kagaku Kogyo Co., Ltd. under the trade name "Denka C3"
AJ, Specific surface area 1.3 po/g by gas adsorption method using a surface area measuring device manufactured by Yuki Ionics 〃 β: Pulverized product of expandable admixture A, specific surface area 2.
5 po/g 〃 γ: Pulverized product of expandable admixture A, specific surface area 4.
5 bo/g Ultrafine powder: Nippon Heavy Industries silica hume, specific gravity 2.
1 High performance water reducing agent: Daiichi Kogyo Seiyaku product name “Cellflow 1”
10PJ Sand: Silica sand No. 7, specific gravity 2.6 Water: Tap water Surface expansive admixture is (parts by weight) Volume change is (volume/volume%) Example 2 High performance water reducing agent 1.5 parts by weight, sand 122 parts by weight and water 35
The same procedure as in Example 1 was conducted except that the parts by weight and the formulations shown in Table 2 were used. The results are also listed in Table-2.

表−２ 体積変化は（体積／体積％） ＊１．ブリージング大、＊２゜ 流動性なし 実施例３ 超微粉としてシリカヒユームの代わりに微粉砕高炉水砕
スラグ（比表面積４．０ｒｒｆ／ｇ）を表−３のように
用いたこと以外は実施例１と同様に行った。Table-2 Volume change is (volume/volume%) *1. Large breathing, *2° No fluidity Example 3 Same as Example 1 except that pulverized granulated blast furnace slag (specific surface area 4.0rrf/g) was used as the ultrafine powder instead of silica fume as shown in Table-3. I did the same.

結果を表−３に併記する。The results are also listed in Table-3.

表−３ 膨張性混和材は（重量部） 体積変化は（体積／体積％） 実施例４ セメント質物質と膨張性混和材の合計１００重量部に対
して、砂１２２重量部及び水５０重量部と、表−４に示
す配合の膨張性混和材と収縮低減剤を混合してモルタル
を混練したこと以外は実施例１と同様に行った。Table 3 Expandable admixture (parts by weight) Volume change (volume/volume%) Example 4 122 parts by weight of sand and 50 parts by weight of water for a total of 100 parts by weight of cementitious material and expandable admixture The same procedure as in Example 1 was carried out except that the expandable admixture and shrinkage reducing agent having the composition shown in Table 4 were mixed and kneaded into mortar.

結果を表−４に併記する。The results are also listed in Table-4.

〈使用材料〉 セメント質物質：秩父セメント社製普通ポルトランドセ
メント、比重３．１６ 収縮低減剤：有機質セメント収縮低減剤ＨＯ（（Ｃ２Ｈ
４０）３（Ｃ−ＨｇＯ）ｔ）　８表 膨張性混和材と収縮低減剤は（重量部）体積変化は（体
積／体積％） 実施例５ 表−５に示すように膨張性混和材と収縮低減剤を使用し
たこと以外は実施例１と同様に行った。<Materials used> Cementitious material: Ordinary Portland cement manufactured by Chichibu Cement Co., Ltd., specific gravity 3.16 Shrinkage reducing agent: Organic cement shrinkage reducing agent HO ((C2H
40) 3(C-HgO)t) 8 Table Expansive admixture and shrinkage reducing agent (parts by weight) Volume change is (volume/volume %) Example 5 As shown in Table 5, expansible admixture and shrinkage reducing agent The same procedure as in Example 1 was carried out except that a reducing agent was used.

結果を表−５に併記する。The results are also listed in Table-5.

なお、収縮低減剤は、セメント質物質、膨張性混和材及
び超微粉の合計１００重量部に対する重量部である。The amount of the shrinkage reducing agent is expressed in parts by weight based on 100 parts by weight of the cementitious material, expandable admixture, and ultrafine powder.

表−５ 膨張性混和材と収縮低減剤は（重量部）体積変化は（体
積／体積％） 〔発明の効果〕 高品質、高耐久性及び高強度性状を損なうことなく、初
期収縮の改善された、セメント混和材及びそれを混和し
た高強度のセメント組成物の提供が可能になった。Table 5 Expandable admixtures and shrinkage reducing agents (parts by weight) Volume change (volume/volume %) [Effects of the invention] Initial shrinkage was improved without impairing high quality, high durability, and high strength properties. In addition, it has become possible to provide a cement admixture and a high-strength cement composition containing the same.

また、これら特定の比表面積を有する膨張材と有機質セ
メント収縮低減剤に超微粉を組み合わせることにより、
初期収縮の低減された、緻密性や耐久性の優れた高強度
コンクリートやグラウト材鉄筋継ぎ手充填材などが得ら
れ、問題となっていた初期の収縮に伴うひび割れの発生
や、特にグラウト材や鉄筋継ぎ手充填材なとての充填後
の収縮による透き間の発生の少ないセメント組成物の提
供か可能となった。In addition, by combining ultrafine powder with an expanding material having a specific specific surface area and an organic cement shrinkage reducing agent,
High-strength concrete with reduced initial shrinkage and excellent density and durability, as well as filling materials for grout and reinforcing bar joints, can be obtained. It has now become possible to provide a cement composition that is less likely to produce gaps due to shrinkage after being filled as a joint filler.

特許出願人　　電気化学工業株式会社Patent applicant: Denki Kagaku Kogyo Co., Ltd.

Claims (4)

【特許請求の範囲】[Claims] （１）比表面積が２ｍ＾２／ｇ以上の膨張性混和材と超
微粉を必須成分とするセメント混和材。(1) A cement admixture whose essential components are an expandable admixture with a specific surface area of 2 m^2/g or more and ultrafine powder. （２）比表面積が２ｍ＾２／ｇ以上の膨張性混和材と有
機質セメント収縮低減剤を必須成分とするセメント混和
材。(2) A cement admixture whose essential components are an expandable admixture with a specific surface area of 2 m^2/g or more and an organic cement shrinkage reducing agent. （３）比表面積が２ｍ＾２／ｇ以上の膨張性混和材、超
微粉及び有機質セメント収縮低減剤を必須成分とするセ
メント混和材。(3) A cement admixture whose essential components are an expandable admixture with a specific surface area of 2 m^2/g or more, ultrafine powder, and an organic cement shrinkage reducing agent. （４）セメント質物質と請求項１、２又は３記載のセメ
ント混和材を主成分とするセメント組成物。(4) A cement composition containing a cementitious material and the cement admixture according to claim 1, 2 or 3 as main components.
JP2246708A 1990-09-17 1990-09-17 Cement admixture and cement composition Pending JPH04130036A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2246708A JPH04130036A (en) 1990-09-17 1990-09-17 Cement admixture and cement composition

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Application Number Priority Date Filing Date Title
JP2246708A JPH04130036A (en) 1990-09-17 1990-09-17 Cement admixture and cement composition

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JPH04130036A true JPH04130036A (en) 1992-05-01

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ID=17152459

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5938835A (en) * 1993-09-14 1999-08-17 W. R. Grace & Co.-Conn. Cement composition
JP2005272156A (en) * 2004-03-23 2005-10-06 Denki Kagaku Kogyo Kk Cement admixture, cement composition, quick hardening grout material, quick hardening grout, and method for preventing deformation of natural ground using the same
JP2009084095A (en) * 2007-09-28 2009-04-23 Denki Kagaku Kogyo Kk Low shrinkage ultrahigh strength fiber-reinforced cement composition, low shrinkage ultrahigh strength fiber-reinforced mortar or concrete, and low shrinkage ultrahigh strength cement admixture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5938835A (en) * 1993-09-14 1999-08-17 W. R. Grace & Co.-Conn. Cement composition
JP2005272156A (en) * 2004-03-23 2005-10-06 Denki Kagaku Kogyo Kk Cement admixture, cement composition, quick hardening grout material, quick hardening grout, and method for preventing deformation of natural ground using the same
JP2009084095A (en) * 2007-09-28 2009-04-23 Denki Kagaku Kogyo Kk Low shrinkage ultrahigh strength fiber-reinforced cement composition, low shrinkage ultrahigh strength fiber-reinforced mortar or concrete, and low shrinkage ultrahigh strength cement admixture
JP4607161B2 (en) * 2007-09-28 2011-01-05 電気化学工業株式会社 Low shrinkage ultra high strength fiber reinforced cement composition, low shrinkage ultra high strength fiber reinforced mortar or concrete, and low shrinkage ultra high strength cement admixture

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