JP2009001449A - Expansive composition - Google Patents

Expansive composition Download PDF

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JP2009001449A
JP2009001449A JP2007163605A JP2007163605A JP2009001449A JP 2009001449 A JP2009001449 A JP 2009001449A JP 2007163605 A JP2007163605 A JP 2007163605A JP 2007163605 A JP2007163605 A JP 2007163605A JP 2009001449 A JP2009001449 A JP 2009001449A
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composition
expansion
gypsum
content
clinker
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Masanori Shibagaki
昌範 柴垣
Shinya Satake
紳也 佐竹
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/008—Cement and like inorganic materials added as expanding or shrinkage compensating ingredients in mortar or concrete compositions, the expansion being the result of a recrystallisation
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00215—Mortar or concrete mixtures defined by their oxide composition
    • 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
    • C04B2111/00439—Physico-chemical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00448—Low heat cements

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansive composition obtained by mixing a clinker composition containing free quicklime and alite with gypsum respectively in a fixed quantity and easily providing optimum expansibility when low heat portland cement is used in combination. <P>SOLUTION: The expansive composition is obtained by mixing a clinker composition containing free quicklime and gypsum, wherein the content of the free quicklime is ≥50 mass% and the content of alite is 15-30 mass% in the clinker composition and the content of gypsum is 30-65 mass% in the expansive composition. The expansive composition is blended to mortar-concrete using the low heat portland cement as a binder phase-forming component in a unit quantity of 15-25 kg/m<SP>3</SP>. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、セメント組成物、例えば、ＰＣコンクリート製道路橋・鉄道橋床版・トンネル覆工・高欄等の土木構造物や倉庫床版、立体駐車場などの一般建築構造物について、コンクリートのひび割れ抑制などのために混和して使用される膨張性組成物に関する。   The present invention relates to a cement composition, such as a concrete concrete structure such as a PC concrete road bridge, a railway bridge deck, a tunnel lining, a railing, a warehouse floor slab, and a general building structure such as a three-dimensional parking lot. The present invention relates to an expandable composition used by mixing for suppression or the like.

近年、コンクリート構造物の耐久性を高めるために、コンクリートのひび割れを抑止するコンクリート用膨張材が注目され、需要が伸びてきている。特にひび割れを低減するためには膨張材を使用することが有効であり、膨張材の使用量を低減して経済的負担を小さくすることが不可欠である。   In recent years, in order to increase the durability of concrete structures, a concrete expansion material that suppresses cracking of concrete has attracted attention, and demand has been increasing. In particular, in order to reduce cracks, it is effective to use an expanding material, and it is essential to reduce the amount of the expanding material used to reduce the economic burden.

コンクリート用の膨張材としては、カルシウムサルホアルミネート等のエトリンガイト生成物質を有効成分とするエトリンガイト系膨張材と遊離生石灰を有効成分とする生石灰系膨張材の二種類が代表的なものとして使用されている。このうち、生石灰系膨張材は一般に水和反応活性が高く、特にコンクリートの大規模な初期収縮を抑制する効果に優れることが知られている。   Two types of expansive materials for concrete are typically used: ettringite-based expansive materials containing ettringite-producing substances such as calcium sulfoaluminate as active ingredients and quicklime-based expansive materials containing free quicklime as active ingredients. Yes. Of these, quicklime-based expansive materials are generally known to have high hydration reaction activity, and in particular, are excellent in the effect of suppressing large-scale initial shrinkage of concrete.

生石灰系膨張材として遊離生石灰をエーライトが内包する形で生成させた膨張性組成物が知られている（例えば、特許文献１参照）。この膨張性組成物は、遊離生石灰を内包させずに生成させた生石灰系膨張材に比べて、膨張制御が容易であり、強度低下が少ないという特性がある。   An expansible composition in which free quick lime is produced in a form in which alite is included is known as a quicklime-based expansive material (see, for example, Patent Document 1). This expansible composition has the characteristics that expansion control is easier and strength reduction is less than that of quicklime-based expansive material produced without encapsulating free quicklime.

これら上記膨張性組成物は、近年、単位量およそ２０kg/ｍ3の低添加型膨張材としての使用が主流となり、土木分野に限らず建築分野においても膨張コンクリートの乾燥収縮ひび割れ抑制を目的として使用されている。このような膨張コンクリートに使用されるセメントは、通常、ポルトランドセメントが使用されている。さらに、このポルトランドセメントとしては、普通ポルトランドセメントや早強ポルトランドセメントが一般に使用されている。 In recent years, these expansive compositions have been mainly used as low addition type expansive materials with a unit amount of about 20 kg / m 3 , and are used not only in the civil engineering field but also in the construction field for the purpose of suppressing dry shrinkage cracking of expanded concrete. Has been. As the cement used for such expanded concrete, Portland cement is usually used. Further, as this Portland cement, ordinary Portland cement and early-strength Portland cement are generally used.

膨張コンクリートに使用される膨張材は、セメントの水和反応に応じて膨張反応が調整されており、一般に用いられている普通ポルトランドセメントや早強ポルトランドセメントの水和反応を基準として設計されている。   The expansive material used for expansive concrete has its expansion reaction adjusted according to the hydration reaction of the cement, and is designed based on the hydration reaction of ordinary Portland cement and early-strength Portland cement. .

一方、高耐久性の観点から低熱ポルトランドセメントがコンクリート構造物に盛んに使用されている。この低熱ポルトランドセメントは、普通ポルトランドセメントに比べて水和熱の大きなエーライト相(Ｃ3Ｓ)やカルシウムアルミネート相(Ｃ3Ａ)が少ない反面、水和熱量が小さいビーライト相(Ｃ2Ｓ)の含有比率が２倍近くあるため、水和反応が普通ポルトランドセメントよりも大きく遅延する。 On the other hand, low heat Portland cement is actively used in concrete structures from the viewpoint of high durability. The low thermal Portland cement, normal Portland cement large alite phase heat of hydration than the (C 3 S) and calcium aluminate phases (C 3 A) whereas little, hydration heat is small belite phase (C 2 Since the content ratio of S) is nearly double, the hydration reaction is delayed more than normal Portland cement.

このため、低熱ポルトランドセメントに上記膨張材を組み合わせて使用する場合、膨張材の使用量が従来と同様の単位量２０kg/ｍ3程度では、膨張材と低熱ポルトランドセメントの水和反応の時間的なズレから、コンクリートは３００μ以上の過膨張を生じ易い（例えば、非特許文献１参照）。このように、低熱ポルトランドセメントと膨張材とを併用する場合、従来は膨張性能を適正化することが難しく、低熱ポルトランドセメントと膨張材と併用する例は少ない。 For this reason, when the expansion material is used in combination with the low heat Portland cement, if the amount of the expansion material used is about 20 kg / m 3 as in the conventional case, the time for the hydration reaction between the expansion material and the low heat Portland cement Due to the deviation, the concrete tends to cause overexpansion of 300 μm or more (for example, see Non-Patent Document 1). Thus, when using low heat Portland cement and an expansion material together, conventionally, it is difficult to optimize expansion performance, and there are few examples using low heat Portland cement and an expansion material together.

低熱過膨張の抑制方法として、膨張材の単位量を減じて使用する方法もあるが、膨張材中のエーライト量も減るため、強度低下や低添加によって生コンプラントにおける分散性の低下などが課題として挙げられる。また、乾燥収縮が顕著な建築構造物については水結合材比を限定し、膨張材の単位量（kg/ｍ3）を調整し、膨張材と低熱ポルトランドセメントを組み合わせて使用することも知られている（特許文献２参照）。しかし、この使用方法は規格〔土木学会「膨張コンクリートの施工指針」（膨張材を混和したコンクリートの拘束膨張率150〜250μ）〕の規定外となり、水結合材比を４５％以下に限定することが必要であり、また、膨張材の単位量も調整する必要がある等の課題が残る。
特開昭５０−２４３２０号公報 特開２００４−２１７５１４公報 コンクリート工学年次論文報告集Vol.19、No.1、1997年、「高強度・低収縮・高流動コンクリートの低収縮化に関する基礎研究」 There is also a method of reducing the unit amount of the expanded material as a method for suppressing low thermal overexpansion, but the amount of alite in the expanded material is also decreased, so there are problems such as a decrease in strength and a decrease in dispersibility in raw plants due to low addition. As mentioned. It is also known to use a combination of expansive material and low heat Portland cement by limiting the water binder ratio and adjusting the unit amount (kg / m 3 ) of the expansive material for building structures with significant drying shrinkage. (See Patent Document 2). However, this method of use is outside the standards of the standard [Construction Guidelines for Expanded Concrete] (Constrained Expansion Rate of Concrete Mixed with Expanding Material 150-250μ), and the water binder ratio should be limited to 45% or less. However, there remains a problem that the unit amount of the expansion material needs to be adjusted.
Japanese Patent Laid-Open No. 50-24320 JP 2004-217514 A Annual Report of Concrete Engineering Vol.19, No.1, 1997, "Fundamental study on low-shrinkage of high-strength, low-shrinkage, high-fluidity concrete"

本発明は、従来の上記課題を解決したものであり、遊離生石灰およびエーライトを含有するクリンカー組成物と石膏とを一定量混合してなる膨張性組成物であって、低熱ポルトランドセメントと併用した場合に最適な膨張性を容易に得ることができる膨張性組成物を提供する。   The present invention solves the above-mentioned conventional problems, and is an expandable composition obtained by mixing a certain amount of a clinker composition containing gypsum and free quick lime and alite, which is used in combination with low heat Portland cement. Provided is an expandable composition capable of easily obtaining the optimal expandability in some cases.

本発明は以下に示す構成を有することよって上記課題を解決した膨張性組成物である。
（１）遊離生石灰およびエーライトを含有するクリンカ組成物と石膏とを混合してなる膨張性組成物であって、クリンカ組成物中の遊離生石灰含有量が５０質量％以上およびエーライト含有量が１５〜３０質量％、膨張性組成物中の石膏含有量が３０〜６５質量％であることを特徴とする膨張性組成物。
（２）遊離生石灰はエーライトに内包されているものおよび/または内包されていないものを含み、クリンカ組成物中の遊離生石灰含有量が５５〜７０質量％、膨張性組成物中の石膏含有量が３５〜５０質量％である上記(１)に記載する膨張性組成物。
（３）クリンカ組成物の粉末度が１５００〜５０００cm2/ｇである上記(１)または上記(２)に記載する膨張性組成物。
（４）低熱ポルトランドセメントを結合相形成成分とするモルタル・コンクリートに対して単位量１５〜２５kg/ｍ3で配合される上記(１)〜上記(３)の何れかに記載する膨張性組成物。 This invention is an expansible composition which solved the said subject by having the structure shown below.
(1) An expandable composition obtained by mixing a clinker composition containing free quick lime and alite and gypsum, wherein the free lime content in the clinker composition is 50% by mass or more and the alite content is 15-30 mass%, gypsum content in expansible composition is 30-65 mass%, expansible composition characterized by the above-mentioned.
(2) Free quick lime includes those included in alite and / or those not included, free lime content in clinker composition is 55-70% by mass, gypsum content in expansive composition The expansible composition as described in said (1) whose is 35-50 mass%.
(3) The expansible composition as described in said (1) or (2) whose fineness of a clinker composition is 1500-5000 cm < 2 > / g.
(4) The expansive composition according to any one of (1) to (3), which is blended in a unit amount of 15 to 25 kg / m 3 with respect to mortar and concrete containing low heat Portland cement as a binder phase forming component. .

本発明の膨張性組成物は、遊離生石灰およびエーライトを含むクリンカー組成物と石膏とを併用することによって、低熱ポルトランドセメントの水和反応に適合した膨張反応が進ので、低熱ポルトランドセメントを結合相形成成分とするモルタル・コンクリートに使用したときに最適な膨張効果を得ることができる。   In the expansible composition of the present invention, the combination of a clinker composition containing free quick lime and alite and gypsum promotes an expansive reaction suitable for the hydration reaction of the low heat Portland cement. When used in mortar and concrete as a forming component, an optimal expansion effect can be obtained.

また、本発明の膨張性組成物は遊離生石灰がエーライトによって内包された生成相を含むものは高い強度発現性を有する。さらに、石膏を含有することによって長期的な膨張性能を有し、低熱ポルトランドセメントと組み合わせて使用する場合に、低添加量（例えば20kg/ｍ3）でコンクリートのひび割れを効果的に抑制することができる。 Moreover, the expansible composition of this invention has the high intensity | strength expression property that includes the production | generation phase in which the free quick lime was included by the alite. Furthermore, it has long-term expansion performance by containing gypsum, and when used in combination with low heat Portland cement, it can effectively suppress cracking of concrete with a low addition amount (for example, 20 kg / m 3 ). it can.

以下、本発明を実施例と共に具体的に説明する。なお、％は特に示す場合および単位固有の場合を除き質量％である。   Hereinafter, the present invention will be specifically described together with examples. In addition,% is mass% except the case where it shows in particular and the case intrinsic | native to a unit.

本発明の膨張性組成物は、遊離生石灰およびエーライトを含有するクリンカ組成物と石膏とを混合してなる膨張性組成物であって、遊離生石灰含有量が５０％以上およびエーライト含有量が１５〜３０％のクリンカ組成物を用い、該膨張性組成物に石膏を３０〜６５％含有させた膨張性組成物である。   The expandable composition of the present invention is an expandable composition formed by mixing a clinker composition containing free quick lime and alite and gypsum, and has a free quick lime content of 50% or more and an alite content. It is an expandable composition using 15-30% clinker composition and containing 30-65% gypsum in the expandable composition.

本発明の膨張性組成物に用いるクリンカ組成物には、クリンカ組成物が製造されるときに生成した遊離生石灰およびエーライトが含有されている。クリンカ組成物中の遊離生石灰量は、５０％以上を必要とし、５５〜７０％が好ましい。遊離生石灰量が５０％未満では膨張に寄与する酸化カルシウムが不足するので十分な膨張性能を得ることができない。一方、遊離生石灰量が７０％を超えると、酸化カルシウム含有率が高いため、クリンカ組成物中のエーライト含有率が減少し、膨張コンクリートに緻密な硬化体組織が得られず、諸条件によっては強度低下を生じる可能性があるので、７０％以下が好ましい。   The clinker composition used in the expandable composition of the present invention contains free quick lime and alite produced when the clinker composition is produced. The amount of free quick lime in the clinker composition requires 50% or more, and is preferably 55 to 70%. When the amount of free quick lime is less than 50%, calcium oxide contributing to expansion is insufficient, so that sufficient expansion performance cannot be obtained. On the other hand, if the amount of free quick lime exceeds 70%, the calcium oxide content is high, so the alite content in the clinker composition decreases, and a dense hardened body structure cannot be obtained in expanded concrete, depending on various conditions Since strength reduction may occur, 70% or less is preferable.

本発明の膨張性組成物に用いるクリンカ組成物に含有されているエーライトは、遊離生石灰を内包するもの、および/または内包しないものを含む。なお、遊離生石灰はエーライトに内包されているものが好ましいが、遊離生石灰の内包率は限定されない。   The alite contained in the clinker composition used in the expandable composition of the present invention includes those containing free quick lime and / or those containing no free quick lime. In addition, although the thing in which free quick lime is included in alite is preferable, the inclusion rate of free quick lime is not limited.

クリンカ組成物中のエーライト含有量は１５％〜３０％が好ましい。エーライト含有量が１５％未満では遊離生石灰に対するエーライトの内包率が低くなり、膨張コンクリートが緻密な硬化体組織になり難く、膨張コンクリートに強度低下を生じる可能性がある。一方、エーライト含有率が３０％を上回ると膨張に寄与する酸化カルシウムが不足し、十分な膨張性能を得ることができない。   The alite content in the clinker composition is preferably 15% to 30%. If the alite content is less than 15%, the inclusion rate of alite with respect to free quick lime becomes low, and the expanded concrete is unlikely to become a dense hardened body structure, which may cause a decrease in strength of the expanded concrete. On the other hand, if the alite content exceeds 30%, calcium oxide contributing to expansion is insufficient, and sufficient expansion performance cannot be obtained.

クリンカ組成物には遊離生石灰を内包したエーライト相の他に、例えば、エーライトによって内包されていない遊離生石灰、カルシウムアルミネート相、フェライト相、無水石膏等の何れか１種または２種以上を生成相として含むものであっても良い。好ましくは、トリカルシウムアルミネート（C3Ａ）および無水石膏（ＣａＳＯ4）を生成相として含むものが、強度発現性や耐風化性が向上するので好ましい。 In addition to the alite phase containing free quick lime in the clinker composition, for example, any one or more of free quick lime, calcium aluminate phase, ferrite phase, anhydrous gypsum, etc. not contained by alite It may be included as a generation phase. Preferably, the one containing tricalcium aluminate (C 3 A) and anhydrous gypsum (CaSO 4 ) as a production phase is preferable because strength development and weathering resistance are improved.

クリンカ組成物の原料は限定されない。CaO成分の原料として生石灰や石灰石（タンカル）、消石灰などが挙げられ、他の成分の原料として珪石、石膏、ヘマタイト、アルミナ等が挙げられる。また、クリンカ組成物の焼結性を阻害しない範囲で不純物（ＭｇＯ、Ｎａ2Ｏ、Ｋ2ＳＯ4など）が含まれていても良い。 The raw material of the clinker composition is not limited. Examples of the raw material for the CaO component include quick lime, limestone (tankal), and slaked lime, and examples of the raw material for the other components include silica, gypsum, hematite, and alumina. Further, impurities (MgO, Na 2 O, K 2 SO 4, etc.) may be contained within a range that does not impair the sinterability of the clinker composition.

クリンカ組成物の製造方法は限定されず、ロータリーキルンによる焼成や電気炉による溶融などによる熱処理を適宜利用して製造すればよい。クリンカ組成物は原料の配合割合や不純物の含有量によって焼結性が変動するため焼成温度は限定されないが、通常、１３００〜１５００℃の焼成温度で製造される。焼結性が低いと遊離生石灰結晶の成長を損ない、膨張性能が不足するため、クリンカ嵩比重は１.５０以上が適当である。   The manufacturing method of a clinker composition is not limited, What is necessary is just to manufacture suitably using heat processing by baking by a rotary kiln, melting by an electric furnace, etc. The clinker composition is manufactured at a firing temperature of 1300 to 1500 ° C., although the sintering temperature is not limited because the sinterability varies depending on the blending ratio of raw materials and the content of impurities. If the sinterability is low, the growth of free quicklime crystals is impaired, and the expansion performance is insufficient. Therefore, the clinker bulk specific gravity is appropriately 1.50 or more.

クリンカ組成物の粉末度は、１５００〜５０００cm2/ｇが好ましい。粉末度が１５００cm2/ｇ未満では３００μｍ以上の粗粉が混入し、硬化コンクリート表面の肌荒れやポップアウトが生じる可能性があり、また膨張性に有効な粗粒子が多くなるため、過大膨張も懸念される。一方、粉末度が５０００cm2/ｇを上回ると１０μｍ以下の微粉が多くなるため、膨張反応が促進され、十分な硬化体組織が形成される前に膨張発現し、過大膨張や強度低下を生じる。 The fineness of the clinker composition is preferably 1500 to 5000 cm 2 / g. If the fineness is less than 1500 cm 2 / g, coarse powder of 300 μm or more may be mixed in, resulting in rough surface or pop-out of the hardened concrete surface. Is done. On the other hand, when the fineness exceeds 5000 cm 2 / g, fine powder of 10 μm or less is increased, so that the expansion reaction is promoted and developed before a sufficient hardened body structure is formed, resulting in overexpansion and strength reduction.

本発明の膨張性組成物には、上記クリンカ組成物と共に石膏が含有されている。石膏は過膨張抑制作用を果たす。石膏の含有量は、クリンカ組成物中で３０〜６５％が適当であり、３５〜５０％が好ましい。石膏含有量が３０％未満では膨張反応を抑制する効果が不十分になり、膨張性組成物を低熱ポルトランドセメントに対して使用したときに、水和反応が抑制されずに過剰膨張を生じやすい。一方、石膏含有量が６５％を上回ると膨張性組成物中の遊離生石灰量が減少し、膨張に寄与する酸化カルシウムが不足し十分な膨張性能を得ることができない。   The expandable composition of the present invention contains gypsum together with the clinker composition. Gypsum works to suppress overexpansion. The content of gypsum is suitably 30 to 65% in the clinker composition, and preferably 35 to 50%. If the gypsum content is less than 30%, the effect of suppressing the expansion reaction is insufficient, and when the expandable composition is used for low-heat Portland cement, the hydration reaction is not suppressed, and excessive expansion tends to occur. On the other hand, when the gypsum content exceeds 65%, the amount of free quick lime in the expansible composition is reduced, and calcium oxide contributing to expansion is insufficient, and sufficient expansion performance cannot be obtained.

本発明に用いる石膏は何れの種類でも良いが、ＩＩ型無水石膏が好ましい。また、使用する無水石膏の粉末度は３０００cm2/g以上のものが、所望の反応活性が得られるので好ましい。より好ましくは粉末度が６０００cm2/g以上の石膏が良い。粉末度の上限は特に制限されないが、粉末度を高めるコストが嵩む割にはその効果が鈍化することから概ね１５０００cm2/g程度が適当である。 Any kind of gypsum may be used in the present invention, but type II anhydrous gypsum is preferred. The anhydrous gypsum used has a fineness of 3000 cm 2 / g or more, since the desired reaction activity can be obtained. More preferably, gypsum having a fineness of 6000 cm 2 / g or more is preferable. The upper limit of the fineness is not particularly limited, but about 15000 cm 2 / g is suitable for the cost of increasing the fineness because the effect is reduced.

本発明の膨張性組成物は上記クリンカ組成物と石膏とを混合して製造される。混合方法は限定されない。一般にはヘンシェルミキサーや噴射型ミキサー等により均斉化混合される。   The expandable composition of the present invention is produced by mixing the clinker composition and gypsum. The mixing method is not limited. Generally, it is homogenized and mixed by a Henschel mixer or a jet mixer.

本発明の膨張組成物は、低熱ポルトランドセメントを結合相形成成分とするモルタルやコンクリート等に対して、単位量１５〜２５kg/ｍ3の低添加量で使用される。本発明の膨張組成物は上記単位量の低添加量で使用しても、膨張性能が高く、効果的な膨張性能を発現し、コンクリートのひび割れ抑制を十分発揮することができる。なお、膨張組成物の単位量が１５kg/ｍ3未満では膨張性能が不足し、効果的なひび割れを抑制できず、単位量が２５kg/ｍ3を超えると過膨張が生じ、強度低下も招く可能性があるため適当ではない。 The expansion composition of the present invention is used in a low addition amount of 15 to 25 kg / m 3 with respect to mortar, concrete or the like containing low heat Portland cement as a binder phase forming component. Even when the expansion composition of the present invention is used in a low addition amount of the above unit amount, it has high expansion performance, exhibits effective expansion performance, and can sufficiently exhibit cracking suppression of concrete. In addition, if the unit amount of the expansion composition is less than 15 kg / m 3 , the expansion performance is insufficient and effective cracking cannot be suppressed, and if the unit amount exceeds 25 kg / m 3 , overexpansion may occur and strength may be reduced. It is not suitable because of its nature.

本発明の膨張性組成物が使用される低熱ポルトランドセメントは限定されない。一般には日本工業規格（JIS R 5210）に示されるものが使用される。   The low heat Portland cement in which the expandable composition of the present invention is used is not limited. Generally, those shown in Japanese Industrial Standard (JIS R 5210) are used.

本発明の膨張性組成物は、本発明の効果を実質的に失わない範囲で、例えばモルタルやコンクリートに使用できる他の成分を含有するものであっても良い。このような成分として、具体的には、各種セメント、各種骨材、繊維、減水剤（分散剤、高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤等を含む。）、収縮低減剤、シリカフューム、スラグ、凝結促進剤、凝結遅延剤、増粘剤、保水剤、防錆剤、空気連行剤、消泡剤、起泡剤等を例示することができる。   The expandable composition of the present invention may contain other components that can be used for, for example, mortar and concrete as long as the effects of the present invention are not substantially lost. Specific examples of such components include various cements, various aggregates, fibers, water reducing agents (including dispersants, high performance water reducing agents, AE water reducing agents, high performance AE water reducing agents, etc.), shrinkage reducing agents, Examples thereof include silica fume, slag, setting accelerator, setting retarder, thickener, water retention agent, rust preventive agent, air entraining agent, antifoaming agent, and foaming agent.

以下、本発明の実施例を比較例と共に示す。
〔実施例１・比較例１〕
表１に示す使用材料を用い、焼成温度１４００℃で、クリンカ嵩比重が１.６０〜１.７０になるように焼結させたクリンカを粉砕し、粉末度を１３００〜６１００cm2/ｇに調整したクリンカ組成物を製造した。製造したクリンカ組成物に石膏をヘンシェルミキサーにて混合し、膨張組成物を作成した。表２にクリンカ組成物の成分を示し、表３に膨張組成物（低添加型膨張材）の成分を示す。 Examples of the present invention are shown below together with comparative examples.
[Example 1 and Comparative Example 1]
Using the materials shown in Table 1, the clinker sintered so as to have a clinker bulk specific gravity of 1.60 to 1.70 at a firing temperature of 1400 ° C. is pulverized, and the fineness is adjusted to 1300 to 6100 cm 2 / g. A clinker composition was produced. Gypsum was mixed with the manufactured clinker composition with a Henschel mixer to prepare an expanded composition. Table 2 shows the components of the clinker composition, and Table 3 shows the components of the expansion composition (low addition type expansion material).

Figure 2009001449
Figure 2009001449

Figure 2009001449
Figure 2009001449

Figure 2009001449
Figure 2009001449

コンクリートに使用する材料を表４に示す。表３の膨張性組成物を用い、セメントの種類および単位膨張材量をそれぞれ選定し、水セメント比５０.０％、細骨材率４６.４％に設定し、表５の水準にてコンクリートを練り混ぜた。練混ぜたコンクリートの膨張性能を測定した。膨張性能は規格〔JIS A 6202 コンクリート用膨張材付属書２にある拘束膨張及び収縮試験方法(Ａ法)〕に準拠した。また、試験に用いた試験体を表面観察し、ポップアウトの有無を確認した。試験結果を表６に示す。   Table 4 shows the materials used for the concrete. Using the expansive composition shown in Table 3, the type of cement and the amount of expansive material were selected, the water cement ratio was set to 50.0%, and the fine aggregate ratio was 46.4%. Kneaded. The expansion performance of the mixed concrete was measured. The expansion performance was in accordance with the standard [Constrained Expansion and Shrinkage Test Method (Method A) in JIS A 6202 Concrete Expansive Material Appendix 2]. Moreover, the surface of the test body used for the test was observed and the presence or absence of pop-out was confirmed. The test results are shown in Table 6.

低熱ポルトランドセメントを用いたコンクリートに対して本発明の膨張材（本発明試料１〜６）を用いた実施例（No１〜７)は、材齢７日のコンクリート拘束膨張率において、何れも１７０〜２３６μmの良好な膨張性能を発揮し、上記試験方法による「膨張コンクリートの施工指針」に規定されている土木学会基準（材齢７日のコンクリート拘束膨張率：１５０〜２５０μm）を満足する結果であり、硬化試験体のポップアウトも認められなかった。   Examples (No 1 to 7) using the expansion material of the present invention (invention samples 1 to 6) with respect to the concrete using low heat Portland cement are 170- This is a result that demonstrates good expansion performance of 236 μm and satisfies the Japan Society of Civil Engineers standards (concrete expansion rate of concrete at 7 days of age: 150 to 250 μm) stipulated in “Construction Guidelines for Expanded Concrete” by the above test method Also, no pop-out of the cured test specimen was observed.

本発明のクリンカ組成物の粉末度が１５００cm2/g未満の比較試料(No.９)、６０００cm2/g以上の比較試料(No.14)は何れも材齢２８日の拘束膨張率が４００μ以上の過大膨張が認められ、比較試料No.９は試験体表面に多くのポップアウトも認められた。 The comparative sample (No. 9) having a fineness of the clinker composition of the present invention of less than 1500 cm 2 / g and the comparative sample (No. 14) having a fineness of 6000 cm 2 / g or more both have a restricted expansion coefficient of 400 μm at 28 days of age. The above excessive expansion was observed, and in Comparative Sample No. 9, many pop-outs were also observed on the test specimen surface.

コンクリートにおける単位膨張材量を２５kg/m3以上とした比較例No.８、膨張性組成物中に石膏が無い比較試料No.１３、石膏含有率が３０％未満の比較試料No.１２は何れも過大膨張が認められた。 Comparative Example No. 8 in which the amount of unit expansive material in concrete is 25 kg / m 3 or more, Comparative Sample No. 13 having no gypsum in the expansible composition, and Comparative Sample No. 12 having a gypsum content of less than 30% Overswelling was also observed.

本発明のクリンカ組成物中の遊離生石灰含有量が５０％未満の比較試料No.１０、および膨張組成物中の石膏量が７０％以上の比較試料No.１１、コンクリートにおける単位膨張材量が１５kg/m3未満とした比較試料No.１７は何れも膨張性能が不足し、材齢７日のコンクリート拘束膨張率は１５０μ以下であった。 Comparative sample No. 10 in which the free quicklime content in the clinker composition of the present invention is less than 50%, comparative sample No. 11 in which the amount of gypsum in the expansion composition is 70% or more, and the amount of unit expansion material in concrete is 15 kg Comparative sample No. 17 with less than / m 3 had insufficient expansion performance, and the concrete constrained expansion rate at age 7 was 150 μm or less.

また、本発明品の膨張組成物を普通ポルトランドセメントや早強ポルトランドセメントと組み合わせた比較試料No.１５、No.１６は膨張性能が不足し、材齢７日のコンクリート拘束膨張率において、１２０μ以下であった。   In addition, comparative samples No. 15 and No. 16 in which the expansion composition of the present invention is combined with ordinary Portland cement or early strength Portland cement have insufficient expansion performance, and the concrete constrained expansion rate on the age of 7 days is 120 μm or less. Met.

Figure 2009001449
Figure 2009001449

Figure 2009001449
Figure 2009001449

Figure 2009001449
Figure 2009001449

〔実施例２・比較例２〕
実施例１の膨張材組成物、使用材料を用いてモルタルを調製し、長期的な膨張性能をJIS A 6202 膨張材のモルタルによる膨張性試験方法に準拠し、その評価を実施した。試験に用いたモルタルの配合を表７に示し、モルタル拘束膨張試験結果を図１および図２に示す。 [Example 2 and Comparative Example 2]
Mortar was prepared using the expansion material composition and the material used in Example 1, and the long-term expansion performance was evaluated in accordance with the expansion test method using mortar of JIS A 6202 expansion material. Table 7 shows the composition of the mortar used in the test, and FIG. 1 and FIG. 2 show the results of the mortar restraint expansion test.

図１に示すように、本発明品の膨張組成物(本発明試料１〜６)は、材齢７日膨張率で７００〜１０００μの高膨張性能を発揮し、また、材齢７日以降も、長期的にマイルドに水和膨張が持続することが確認され、長期的な乾燥収縮低減効果が期待される。一方、図２の膨張性組成物（参考試料１〜６）は、材齢７日膨張率で１５００μ以上の過膨張（参考試料１、４〜６）と、５００μ以下の膨張不足（参考試料２、３）が認められ、適正な膨張性能を発現することができない。   As shown in FIG. 1, the expansion composition of the present invention product (invention samples 1 to 6) exhibits a high expansion performance of 700 to 1000 μm at an expansion rate of 7 days of age, and also after 7 days of age. It has been confirmed that hydration and expansion can be sustained mildly over the long term, and a long-term effect of reducing dry shrinkage is expected. On the other hand, the expansible composition of FIG. 2 (reference samples 1 to 6) has an overexpansion (reference samples 1 and 4 to 6) of 1500 μm or more and an underexpansion of 500 μm or less (reference sample 2) at a 7-day material expansion rate. 3) is recognized, and proper expansion performance cannot be expressed.

Figure 2009001449
Figure 2009001449

実施例２の試験結果を示すモルタル拘束膨張率の変化を示すグラフThe graph which shows the change of the mortar restraint expansion coefficient which shows the test result of Example 2 比較例２の試験結果を示すモルタル拘束膨張率の変化を示すグラフThe graph which shows the change of the mortar restraint expansion coefficient which shows the test result of the comparative example 2

Claims (4)

遊離生石灰およびエーライトを含有するクリンカ組成物と石膏とを混合してなる膨張性組成物であって、クリンカ組成物中の遊離生石灰含有量が５０質量％以上およびエーライト含有量が１５〜３０質量％、膨張性組成物中の石膏含有量が３０〜６５質量％であることを特徴とする膨張性組成物。
An expandable composition obtained by mixing a clinker composition containing free quick lime and alite and gypsum, wherein the free lime content in the clinker composition is 50% by mass or more and the alite content is 15 to 30 The expansible composition characterized by the fact that the gypsum content in the expansible composition is 30% to 65% by mass.
遊離生石灰はエーライトに内包されているものおよび/または内包されていないものを含み、クリンカ組成物中の遊離生石灰含有量が５５〜７０質量％、膨張性組成物中の石膏含有量が３５〜５０質量％である請求項１に記載する膨張性組成物。
The free quick lime includes those included in alite and / or those not included. The free lime content in the clinker composition is 55 to 70% by mass, and the gypsum content in the expandable composition is 35 to 35%. The expandable composition according to claim 1, which is 50% by mass.
クリンカ組成物の粉末度が１５００〜５０００cm2/ｇである請求項１または請求項２に記載する膨張性組成物。
The expandable composition according to claim 1 or 2, wherein the clinker composition has a fineness of 1500 to 5000 cm 2 / g.
低熱ポルトランドセメントを結合相形成成分とするモルタル・コンクリートに対して単位量１５〜２５kg/ｍ3で配合される請求項１〜請求項３の何れかに記載する膨張性組成物。 The inflatable composition according to any one of claims 1 to 3 , which is blended in a unit amount of 15 to 25 kg / m 3 with respect to mortar concrete containing low heat Portland cement as a binder phase forming component.
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JP2013227172A (en) * 2012-04-26 2013-11-07 Taiheiyo Materials Corp Concrete
JP2014108899A (en) * 2012-11-30 2014-06-12 Taiheiyo Material Kk Cement composition and concrete

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JP2013133245A (en) * 2011-12-26 2013-07-08 Taiheiyo Materials Corp Expansive additive composition and concrete
JP2013227172A (en) * 2012-04-26 2013-11-07 Taiheiyo Materials Corp Concrete
JP2014108899A (en) * 2012-11-30 2014-06-12 Taiheiyo Material Kk Cement composition and concrete

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