JP2002293592A - Cement admixture ahd cement composition - Google Patents

Cement admixture ahd cement composition

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Publication number
JP2002293592A
JP2002293592A JP2001094618A JP2001094618A JP2002293592A JP 2002293592 A JP2002293592 A JP 2002293592A JP 2001094618 A JP2001094618 A JP 2001094618A JP 2001094618 A JP2001094618 A JP 2001094618A JP 2002293592 A JP2002293592 A JP 2002293592A
Authority
JP
Japan
Prior art keywords
cement
concrete
admixture
cement admixture
present
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
Application number
JP2001094618A
Other languages
Japanese (ja)
Other versions
JP4606632B2 (en
Inventor
Takayuki Higuchi
隆行 樋口
Minoru Morioka
実 盛岡
Yasuhiro Nakajima
康宏 中島
Hiroyuki Ohashi
寛之 大橋
Mitsuo Takahashi
光男 高橋
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 JP2001094618A priority Critical patent/JP4606632B2/en
Publication of JP2002293592A publication Critical patent/JP2002293592A/en
Application granted granted Critical
Publication of JP4606632B2 publication Critical patent/JP4606632B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a cement admixture and a cement composition excellent in consistency keeping characteristics of concrete, expansion and strength characteristics, and capable of manufacturing a concrete product in a short time. SOLUTION: The cement admixture contains an expansion material, the main constitutional compound of which is 1 or >=2 kinds of hydraulic compounds selected from among free lime, gypsum anhydride, calcium aluminoferrite, and calcium silicate, and inorganic sulfate. The cement composition contains the cement and the cement admixture. Moreover, the concrete is obtained by kneading the mixture composed of the cement composition, the aggregate and water added thereto. The concrete product is manufactured by casting the concrete into a mold.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、主に、土木・建築
分野において使用されるセメント混和材及びセメント組
成物並びにそれらを用いたコンクリート及びコンクリー
ト製品に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement admixture and a cement composition mainly used in the fields of civil engineering and construction, and concrete and concrete products using the same.

【0002】[0002]

【従来の技術】セメントは安価であり、かつ任意の形に
造ることが可能な優れた材料である。この特徴を生か
し、ボックスカルバートや様々な形の消波ブロックなど
のコンクリート製品が製造されている。この製造方法と
しては、以下のようなものが一般的である。すなわち、
セメント、水、細骨材、粗骨材、減水剤及び各種混和材
(剤)を練り混ぜたコンクリートを型枠に流し込み、振
動を与え締め固め、これを型枠ごと蒸気養生槽に移し、
数時間前養生した後、約20℃/hの速度で昇温する。
所定の温度で2〜3時間程度保持した後、大気中で自然
冷却してから脱型する。
2. Description of the Related Art Cement is an excellent material which is inexpensive and can be formed into any shape. Taking advantage of this feature, concrete products such as box culverts and various types of wave-dissipating blocks are manufactured. The following method is generally used as this manufacturing method. That is,
Pour concrete mixed with cement, water, fine aggregate, coarse aggregate, water reducing agent, and various admixtures (agents) into a mold, vibrate and compact, and transfer this together with the mold to a steam curing tank.
After curing for several hours, the temperature is raised at a rate of about 20 ° C./h.
After maintaining at a predetermined temperature for about 2 to 3 hours, the mold is naturally cooled in the air and then released.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、前記方
法では型枠の脱型までに時間がかかるため、どんなに効
率よく作業を進めても、1日当たり型枠1つから1つの
製品を製造するのが限界であった。そのため、リチウム
塩等の凝結促進剤を添加し高温養生する方法(特開昭6
0−21839号公報)が提案されているが、凝結促進
剤は短時間で作用し初期の強度発現に寄与するものの、
反応が余りに早いため、型枠に流し込む時間が充分に取
れなく、コンクリートを強制的に流し込んだ場合、局所
的に充填されていない部分いわゆるジャンカが生じ、耐
久性が大幅に低下する場合があった。そこで、前記課題
を解消すべく本発明者らは種々検討を重ねた結果、特定
のセメント混和材を使用することにより解決できるとの
知見を得て、本発明を完成するに至った。
However, in the above method, since it takes time until the mold is removed from the mold, it is difficult to produce one product from one mold per day, no matter how efficiently the work is advanced. It was the limit. Therefore, a method of adding a setting accelerator such as a lithium salt and curing at a high temperature (Japanese Patent Laid-Open No.
No. 0-21839) has been proposed, but although the setting accelerator acts in a short time and contributes to the initial strength development,
Because the reaction was too fast, the time to pour into the formwork was not sufficient, and when concrete was forcibly poured, locally unfilled parts, called so-called junkers, occurred, and the durability sometimes decreased significantly. . The inventors of the present invention have conducted various studies in order to solve the above-mentioned problems, and as a result, have found that the problem can be solved by using a specific cement admixture, and have completed the present invention.

【0004】[0004]

【課題を解決するための手段】すなわち、本発明は、遊
離石灰と、無水セッコウと、カルシウムフェライト、カ
ルシウムアルミノフェライト、カルシウムシリケートよ
り選ばれる1種又は2種以上の水硬性化合物を主要な構
成化合物とする膨張材と、無機硫酸塩とを含有してなる
セメント混和材であり、セメントと、該セメント混和材
とを含有してなるセメント組成物である。さらに、前記
セメント組成物に骨材と水を添加し混練してなるコンク
リートであり、該コンクリートを型枠に流し込んで製造
してなるコンクリート製品である。
That is, the present invention relates to a method for preparing free lime, anhydrous gypsum, and one or more hydraulic compounds selected from calcium ferrite, calcium alumino ferrite and calcium silicate as main constituent compounds. And a cement composition containing cement and the cement admixture. Further, the concrete is a concrete obtained by adding an aggregate and water to the cement composition and kneading the concrete, and a concrete product produced by pouring the concrete into a mold.

【0005】[0005]

【発明の実施の形態】以下、本発明を更に詳細に説明す
る。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

【0006】本発明のセメント混和材に使用される膨張
材は、遊離石灰と、無水セッコウと、カルシウムフェラ
イト、カルシウムアルミノフェライト、カルシウムシリ
ケートより選ばれる1種又は2種以上の水硬性化合物
(以下、水硬性化合物と略記する)を主要な構成化合物
とする。遊離石灰、無水セッコウ、水硬性化合物の配合
割合については、特に限定されるものではないが、膨張
材100部中、遊離石灰は20〜70部が好ましく、4
0〜60部がより好ましい。また、水硬性化合物は5〜
45部が好ましく、10〜40部がより好ましい。さら
に、無水セッコウは5〜40部が好ましく、10〜30
部がより好ましい。膨張材中の各化合物の組成割合が前
記範囲内にないと、優れた膨張性能が得られない場合が
ある。なお、本発明で使用する配合割合を示す部、%は
質量単位である。
The expanding material used in the cement admixture of the present invention includes free lime, anhydrous gypsum, and one or more hydraulic compounds (hereinafter, referred to as calcium ferrite, calcium alumino ferrite, and calcium silicate). (Abbreviated as hydraulic compound) is the main constituent compound. The mixing ratio of the free lime, anhydrous gypsum and the hydraulic compound is not particularly limited, but 20 to 70 parts of free lime is preferable in 100 parts of the expanding material, and
0 to 60 parts is more preferable. Moreover, the hydraulic compound is 5 to 5.
45 parts is preferable and 10 to 40 parts is more preferable. Further, 5-40 parts of anhydrous gypsum is preferable, and 10-30
Parts are more preferred. If the composition ratio of each compound in the expanding material is not within the above range, excellent expansion performance may not be obtained. In addition, the part and% which show the mixing ratio used by this invention are a mass unit.

【0007】本発明の膨張材中に含まれるカルシウムア
ルミノフェライトとは、CaO−Al23−Fe23
を総称するものであり、特に限定されるものではない
が、一般的にCaOをC、Al23をA、Fe23をF
とすると、C4AFやC62F等の化合物がよく知られ
ている。通常は、C4AFとして存在していると考えて
良い。同様に、膨張材中に含まれるカルシウムフェライ
トとは、CaO−Fe23系を総称するものであり、特
に限定されるものではないが、前記の標記方法では、C
2F等の化合物がよく知られている。また、膨張材中に
含まれるカルシウムシリケートとは、CaO−SiO2
系を総称するものであり、特に限定されるものではない
が、C2SやC3Sがよく知られている。通常は、C3
として存在していると考えて良い。以下、本発明では、
カルシウムアルミノフェライトをC4AFと、カルシウ
ムフェライトをC2Fと、カルシウムシリケートをC3
と略記する。
[0007] The calcium alumino-ferrite contained in the expanding material of the present invention is a general term for a CaO-Al 2 O 3 -Fe 2 O 3 system, and is not particularly limited. C, Al 2 O 3 A, Fe 2 O 3 F
Then, compounds such as C 4 AF and C 6 A 2 F are well known. Normally, it can be considered that it exists as C 4 AF. Similarly, calcium ferrite contained in the expanding material is a general term for CaO—Fe 2 O 3 system, and is not particularly limited.
Compounds such as 2 F are well known. The calcium silicate contained in the expanding material is CaO—SiO 2
Although it is a general term for a system and is not particularly limited, C 2 S and C 3 S are well known. Usually, C 3 S
It can be considered that it exists. Hereinafter, in the present invention,
Calcium alumino ferrite is C 4 AF, calcium ferrite is C 2 F, and calcium silicate is C 3 S
Abbreviated.

【0008】本発明のセメント混和材に使用される膨張
材を製造する際、CaO原料、Al 23原料、Fe23
原料、SiO2原料及びCaSO4原料を熱処理して、遊
離石灰、水硬性化合物及び無水セッコウからなるクリン
カ−を合成することが好ましい。遊離石灰、水硬性化合
物及び無水セッコウを別々あるいは一部を別々に合成
し、それらを混合しても本発明に使用される組成の膨張
材も使用可能であるが、優れた膨張性能を得るためには
全部を一度に焼成することが好ましい。
[0008] Expansion used in the cement admixture of the present invention
When manufacturing materials, CaO raw material, Al TwoOThreeRaw material, FeTwoOThree
Raw material, SiOTwoRaw materials and CaSOFourHeat-treat the raw materials
Clean consisting of calcined lime, hydraulic compound and anhydrous gypsum
Preferably, the car is synthesized. Free lime, hydraulic compound
Product and anhydrous gypsum separately or partly separately
And even if they are mixed, the expansion of the composition used in the present invention
Although materials can be used, in order to obtain excellent expansion performance
It is preferable to fire all at once.

【0009】CaO原料、Al23原料、Fe23
料、SiO2原料及びCaSO4原料を熱処理して膨張材
を製造したかどうかは、例えば、粉砕物中の100μm
以上の粗粒子の顕微鏡観察を行い、その粒子中に遊離石
灰、水硬性化合物及び無水セッコウが混在していること
を確認することによって判別できる。
Whether the expanded material is produced by heat-treating the CaO raw material, the Al 2 O 3 raw material, the Fe 2 O 3 raw material, the SiO 2 raw material and the CaSO 4 raw material is determined, for example, by determining whether the expanded material is 100 μm or less.
The above coarse particles can be discriminated by microscopic observation and confirming that free lime, a hydraulic compound and anhydrous gypsum are mixed in the particles.

【0010】本発明の膨張材に使用されるクリンカーを
製造する際の熱処理温度であるが、1100〜1600
℃の範囲が好ましく、1200〜1500℃の範囲がよ
り好ましい。1100℃未満では、得られたセメント混
和材の膨張性能が十分でなく、1600℃を超えると無
水セッコウが分解する恐れがある。
The heat treatment temperature for producing the clinker used in the expanding material of the present invention is 1100 to 1600.
C. is preferable, and the range of 1200 to 1500 C. is more preferable. If the temperature is lower than 1100 ° C., the obtained cement admixture has insufficient expansion performance, and if it exceeds 1600 ° C., anhydrous gypsum may be decomposed.

【0011】CaO原料としては、石灰石や消石灰が挙
げられ、Al23原料としては、ボ−キサイトやアルミ
残灰等が挙げられ、Fe23原料としては、銅カラミや
鉄粉及び市販の酸化鉄等が挙げられ、SiO2原料とし
ては、市販の二酸化ケイ素や珪石が挙げられ、CaSO
4原料としては、二水セッコウ、半水セッコウ及び無水
セッコウ等が挙げられる。これら原料中には各種の不純
物が存在し、その具体例としては、MgO,TiO2
25、Na2O、K2O等が挙げられ、本発明の目的を
実質的に阻害しない範囲では特に問題とはならない。
Examples of the CaO raw material include limestone and slaked lime, examples of the Al 2 O 3 raw material include bauxite and aluminum residual ash, and examples of the Fe 2 O 3 raw material include copper karami, iron powder, and commercially available. And SiO 2 raw materials include commercially available silicon dioxide and silica stone.
4 Raw materials include dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum and the like. Various impurities are present in these raw materials, and specific examples thereof include MgO, TiO 2 ,
P 2 O 5 , Na 2 O, K 2 O and the like are mentioned, and there is no particular problem as long as the object of the present invention is not substantially inhibited.

【0012】本発明の膨張材は、合成されたクリンカー
を粉砕することにより製造され、その粒度は、特に限定
されるものではないが、通常、ブレ−ン比表面積で15
00〜6000cm2/gが好ましく、2500〜40
00cm2/gがより好ましい。1500cm2/g未満
では、強度発現性が悪くなる場合があり、6000cm
2/gを超えると優れた膨張性能が得られない場合があ
る。
The intumescent material of the present invention is produced by pulverizing the synthesized clinker, and its particle size is not particularly limited.
00 to 6000 cm 2 / g is preferable, and 2500 to 40
00 cm 2 / g is more preferred. If it is less than 1500 cm 2 / g, strength development may be poor, and
If it exceeds 2 / g, excellent expansion performance may not be obtained.

【0013】本発明に使用される無機硫酸塩とは、特に
限定されるものではないが、硫酸ナトリウムや硫酸カリ
ウム、硫酸アルミニウム、硫酸鉄が好ましく、なかでも
硫酸ナトリウムが好ましい。これら無機硫酸塩を使用す
ることにより、型枠に流し込む前のコンクリートのコン
システンシーを損ねることなくコンクリートの硬化が促
進され、型枠脱型までの時間を短縮することが可能とな
る。具体的には通常数時間行う前養生を行わずに蒸気養
生を行い、コンクリート製品に必要とされる脱型強度
(10N/mm2)を得ることができる。
The inorganic sulfate used in the present invention is not particularly limited, but sodium sulfate, potassium sulfate, aluminum sulfate and iron sulfate are preferred, and sodium sulfate is particularly preferred. By using these inorganic sulfates, the hardening of the concrete is promoted without impairing the consistency of the concrete before pouring into the mold, and the time until the mold is released from the mold can be shortened. Specifically, steam curing is performed without performing pre-curing, which is usually performed for several hours, so that the demolding strength (10 N / mm 2 ) required for concrete products can be obtained.

【0014】本発明のセメント混和材中の膨張材と無機
硫酸塩の配合量は、特に限定されるものではないが、セ
メント混和材100部中、膨張材50〜99部、無機硫
酸塩1〜50部であることが好ましく、膨張材70〜9
9部、無機硫酸塩1〜30部であることがより好まし
い。前記範囲外の場合、蒸気養生後に充分な強度が得ら
れなかったり、硬化後のコンクリートに白華と呼ばれる
白い析出物が生成する恐れがある。
The amounts of the expanding material and the inorganic sulfate in the cement admixture of the present invention are not particularly limited, but 50 to 99 parts of the expanding material, 1 to 100 parts of the inorganic sulfate and 100 parts of the cement admixture. It is preferably 50 parts, and the expansion material 70 to 9
More preferably, 9 parts and 1 to 30 parts of inorganic sulfate are used. If the ratio is outside the above range, sufficient strength may not be obtained after steam curing, or white precipitates called efflorescence may be formed on the hardened concrete.

【0015】本発明のセメント混和材の使用量は、特に
限定されるものではないが、通常セメントと本発明の混
和材からなるセメント組成物100部中、3〜12部が
好ましく5〜10部がより好ましい。3部未満では充分
な膨張性能が得られない場合があり、12部を超えて使
用した場合にはコンクリートの長期耐久性が低下する場
合がある。
The amount of the cement admixture of the present invention is not particularly limited, but is usually 3 to 12 parts, preferably 5 to 10 parts in 100 parts of a cement composition comprising cement and the admixture of the present invention. Is more preferred. If the amount is less than 3 parts, sufficient expansion performance may not be obtained, and if the amount exceeds 12 parts, the long-term durability of concrete may decrease.

【0016】本発明に使用されるセメントとしては、普
通セメント、早強、超早強、低熱及び中庸熱等各種ポル
トランドセメントと、これらセメントに、高炉スラグ、
フライアッシュ及びシリカを混合した各種混合セメン
ト、石灰石粉末等を混合したフィラーセメント、並びに
アルミナセメント等が挙げられ、これらのうちの1種又
は2種以上が使用可能である。
As the cement used in the present invention, various portland cements such as ordinary cement, high strength, ultra high strength, low heat and moderate heat, and blast furnace slag,
Various mixed cements in which fly ash and silica are mixed, filler cements in which limestone powder and the like are mixed, alumina cements and the like can be used, and one or more of these can be used.

【0017】本発明では、減水剤、高性能減水剤、AE
減水剤、高性能AE減水剤、流動化剤、消泡剤、増粘
剤、防錆剤、防凍剤、収縮低減剤、高分子エマルジョン
及び凝結調整剤、並びにセメント急硬材、セメント膨張
材、ベントナイトやゼオライト等の粘土鉱物、ハイドロ
タルサイト等のアニオン交換体等のうちの一種又は二種
以上を、本発明の目的を実質的に阻害しない範囲で使用
することが可能である。
In the present invention, a water reducing agent, a high-performance water reducing agent, AE
Water reducing agent, high-performance AE water reducing agent, fluidizing agent, defoaming agent, thickener, rust inhibitor, anti-freezing agent, shrinkage reducing agent, polymer emulsion and setting regulator, cement hardening material, cement expanding material, One or two or more of clay minerals such as bentonite and zeolite, and anion exchangers such as hydrotalcite can be used as long as the object of the present invention is not substantially inhibited.

【0018】本発明では、各材料の混合方法は特に限定
されるものではなく、それぞれの材料を施工時に混合し
ても良いし、予めその一部、或いは全部を混合しておい
ても差し支えない。混合装置としては、既存の如何なる
装置も使用可能であり、例えば、傾胴ミキサ、オムニミ
キサ、ヘンシェルミキサ、V型ミキサ及びナウタミキサ
等が挙げられる。
In the present invention, the method of mixing the respective materials is not particularly limited, and the respective materials may be mixed at the time of construction, or some or all of them may be mixed in advance. . As the mixing device, any existing device can be used, and examples thereof include a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, and a Nauta mixer.

【0019】[0019]

【実施例】以下、実施例により本発明を詳細に説明す
る。
The present invention will be described below in detail with reference to examples.

【0020】実施例1 CaO原料、Al23原料、Fe23原料、SiO2
料及びCaSO4原料を配合し、混合粉砕した後、13
50℃で2時間熱処理して合成したクリンカーをブレ−
ン比表面積3000±200cm2/gに粉砕して、表
1に示す様々な組成の膨張材を製造した。これら膨張材
80部と、無機硫酸塩A20部とを混合してセメント混
和材とし、セメントとセメント混和材からなるセメント
組成物100部中、セメント混和材を8部配合し、単位
セメント組成物量が300kg/m 3、水/セメント組
成物比=40%、s/a=45%、減水剤=セメント組
成物量×0.8%のコンクリートを調製した。このコン
クリートのスランプを計測した後、型枠に流し込み、下
記条件により蒸気養生を行い脱型後の長さ変化率、圧縮
強度(脱型時(4h)と1日)を測定した。これらの結
果を表1に併記する。なお、膨張材は粉末X線回折装置
(XRD)及び化学分析により分析し、所定の化合物で
あることを確認した。
Example 1 CaO raw material, AlTwoOThreeRaw material, FeTwoOThreeRaw material, SiOTwooriginal
And CaSOFourAfter blending the raw materials and mixing and grinding, 13
Blaze the clinker synthesized by heat treatment at 50 ° C for 2 hours.
3000 ± 200cmTwo/ G, and
Inflatables of various compositions shown in FIG. These expanding materials
80 parts and 20 parts of inorganic sulfate A are mixed and mixed with cement.
Cement made of cement and cement admixture as Japanese material
In 100 parts of the composition, 8 parts of the cement admixture is blended, and the unit is
300 kg / m cement composition Three, Water / cement group
Composition ratio = 40%, s / a = 45%, water reducing agent = cement group
Concrete having a composition amount of 0.8% was prepared. This con
After measuring the slump of the cleat, pour it into the
Steam curing under the above conditions, length change rate after demolding, compression
The strength (during demolding (4 h) and 1 day) was measured. These conclusions
The results are shown in Table 1. The expansion material is a powder X-ray diffractometer.
(XRD) and chemical analysis
Confirmed that there is.

【0021】<使用材料> セメント:市販早強ポルトランドセメント 水:水道水 減水剤:市販高性能AE減水剤、ナフタレン系 砂:新潟県姫川産、比重2.62 砂利:新潟県姫川産、比重2.64 CaO原料:試薬一級炭酸カルシウム Al23原料:試薬一級酸化アルミニウム Fe23原料:試薬一級酸化鉄 SiO2原料:試薬一級二酸化ケイ素 CaSO4原料:試薬一級無水セッコウ 無機硫酸塩A:試薬一級硫酸ナトリウム<Materials> Cement: Commercially available Portland cement with high strength Water: Tap water Water reducing agent: Commercially available high-performance AE water reducing agent, naphthalene type Sand: Himekawa, Niigata prefecture, specific gravity 2.62 Gravel: Himekawa, Niigata prefecture, specific gravity 2 .64 CaO raw material: reagent primary calcium carbonate Al 2 O 3 raw material: reagent primary aluminum oxide Fe 2 O 3 raw material: reagent primary iron oxide SiO 2 raw material: reagent primary silicon dioxide CaSO 4 raw material: reagent primary anhydrous gypsum inorganic sulfate A: Reagent primary sodium sulfate

【0022】<測定方法> 化学分析:JIS R 5202に準じて測定。 化合物組成:遊離石灰含有量をJIS R 5202に
準じて測定し、それ以外の化合物については計算により
求めた。つまり、Al23量からC4AF量を算出し、
SiO2量からC3S量を算出し、次いでSO3量から無
水セッコウ量を算出した。 圧縮強度:JIS A 1108 長さ変化率:JIS A 6202 Bに準じて測定。
環境温度は20℃。
<Measurement method> Chemical analysis: Measured according to JIS R5202. Compound composition: Free lime content was measured according to JIS R5202, and other compounds were determined by calculation. That is, the C 4 AF amount is calculated from the Al 2 O 3 amount,
The amount of C 3 S was calculated from the amount of SiO 2 , and then the amount of anhydrous gypsum was calculated from the amount of SO 3 . Compressive strength: JIS A 1108 Length change rate: Measured according to JIS A 6202 B.
Environmental temperature is 20 ° C.

【0023】蒸気養生条件:コンクリートを型枠に流し
込んだ後、ただちに蒸気養生室内に移す。水蒸気により
60℃/hの速度で昇温し、60℃の状態で1時間保持
する。その後、蒸気を停止し2時間かけて自然冷却す
る。
Steam curing condition: After concrete is poured into a mold, it is immediately transferred into a steam curing room. The temperature is raised at a rate of 60 ° C./h by steam, and the temperature is maintained at 60 ° C. for 1 hour. Thereafter, the steam is stopped and the mixture is naturally cooled for 2 hours.

【0024】[0024]

【表1】 [Table 1]

【0025】表1より、本発明のセメント混和材を使用
するとコンクリートのコンシステンシーの保持性能、膨
張性能、強度発現性に優れることが分かる。
From Table 1, it can be seen that the use of the cement admixture of the present invention is excellent in the ability to maintain the consistency of concrete, expandability, and develop strength.

【0026】実施例2 実験No.1-4の配合において、表2に示す様に無機硫酸塩
の種類を変えたこと以外は、実施例1と同様に実施し
た。結果を表2に併記する。
Example 2 The procedure of Example 1 was repeated, except that the type of the inorganic sulfate was changed as shown in Table 2 in the formulation of Experiment Nos. 1-4. The results are also shown in Table 2.

【0027】<使用材料> 無機硫酸塩A:試薬一級硫酸ナトリウム 無機硫酸塩B:試薬一級硫酸カリウム<Materials> Inorganic sulfate A: reagent primary sodium sulfate Inorganic sulfate B: reagent primary potassium sulfate

【0028】[0028]

【表2】 [Table 2]

【0029】表2より、本発明のセメント混和材は、い
ずれの無機硫酸塩を用いてもコンクリートのコンシステ
ンシーの保持性能、膨張性能、強度発現性に優れている
が、中でも硫酸ナトリウムが好ましいことが分かる。
From Table 2, it can be seen that the cement admixture of the present invention is excellent in the ability to maintain the consistency of concrete, expandability, and develop strength even when any of the inorganic sulfates is used. I understand.

【0030】実施例3 実験No.1-4の配合において、表3に示す様に膨張材と無
機硫酸塩の配合割合を変えたこと以外は、実施例1と同
様に実施した。結果を表3に併記する。
Example 3 An experiment was carried out in the same manner as in Example 1 except that the proportions of the expanding material and the inorganic sulfate were changed as shown in Table 3 in the formulations of Experiment Nos. 1-4. The results are also shown in Table 3.

【0031】[0031]

【表3】 [Table 3]

【0032】表3より、本発明のセメント混和材を使用
すると、コンクリートに白華の析出が無く、優れたコン
システンシーの保持性能、膨張性能、強度発現性を示す
ことが分かる。
From Table 3, it can be seen that the use of the cement admixture of the present invention does not cause efflorescence in the concrete, and shows excellent consistency retention performance, expansion performance and strength development.

【0033】実施例4 実験No.1-4の配合において、表4に示す様にセメントと
セメント混和材からなるセメント組成物100部中のセ
メント混和材の配合量を変えたこと以外は、実施例1と
同様に実施した。結果を表4に併記する。
Example 4 In the formulation of Experiment Nos. 1-4, except that the blending amount of the cement admixture in 100 parts of the cement composition comprising the cement and the cement admixture was changed as shown in Table 4, Performed as in Example 1. The results are shown in Table 4.

【0034】[0034]

【表4】 [Table 4]

【0035】表4より、本発明のセメント混和材を使用
すると、優れたコンクリートのコンシステンシーの保持
性能、膨張性能、強度発現性を示すことが分かる。
From Table 4, it can be seen that the use of the cement admixture of the present invention exhibits excellent concrete consistency retention performance, expansion performance and strength development.

【0036】[0036]

【発明の効果】本発明のセメント混和材及びセメント組
成物を使用することにより、コンクリートのコンシステ
ンシーの保持性能、膨張性能、強度発現性に優れ、短時
間でコンクリート製品を製造することが可能となる。
By using the cement admixture and the cement composition of the present invention, it is possible to produce a concrete product in a short period of time with excellent retention performance, expansion performance and strength development of concrete consistency. Become.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C04B 28/04 C04B 28/04 // C04B 103:60 103:60 (72)発明者 大橋 寛之 新潟県西頸城郡青海町大字青海2209番地 電気化学工業株式会社青海工場内 (72)発明者 高橋 光男 新潟県西頸城郡青海町大字青海2209番地 電気化学工業株式会社青海工場内 Fターム(参考) 4G012 PC09 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C04B 28/04 C04B 28/04 // C04B 103: 60 103: 60 (72) Inventor Hiroyuki Ohashi Nishikubiki, Niigata 2209 Aomi, Aomi-cho, Gunma Inside the Aomi Plant of Denki Kagaku Kogyo K.K.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 遊離石灰と、無水セッコウと、カルシウ
ムフェライト、カルシウムアルミノフェライト、カルシ
ウムシリケートより選ばれる1種又は2種以上の水硬性
化合物を主要な構成化合物とする膨張材と、無機硫酸塩
とを含有してなるセメント混和材。
1. An inflating material containing free lime, anhydrous gypsum, one or two or more hydraulic compounds selected from calcium ferrite, calcium aluminoferrite and calcium silicate as main constituent compounds, and an inorganic sulfate. A cement admixture comprising:
【請求項2】 セメントと、請求項1記載のセメント混
和材とを含有してなるセメント組成物。
2. A cement composition comprising a cement and the cement admixture according to claim 1.
【請求項3】 請求項2に記載のセメント組成物に骨材
と水を添加し混練してなるコンクリート。
3. A concrete obtained by adding an aggregate and water to the cement composition according to claim 2, and kneading the mixture.
【請求項4】 請求項3に記載のコンクリートを型枠に
流し込んで製造してなるコンクリート製品。
4. A concrete product produced by pouring the concrete according to claim 3 into a mold.
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JP2008201592A (en) * 2007-02-16 2008-09-04 Denki Kagaku Kogyo Kk Expansion material, cement composition, and cement concrete obtained by using the same
JP2008239392A (en) * 2007-03-27 2008-10-09 Denki Kagaku Kogyo Kk Expansive admixture, cement composition, and cement hardened body formed by using the same
JP2010006680A (en) * 2008-06-30 2010-01-14 Taiheiyo Materials Corp Expansive composition and expansive material
WO2012077418A1 (en) * 2010-12-08 2012-06-14 電気化学工業株式会社 Cement admixture, cement composition, and hexavalent chromium reduction method using same
JP2013133245A (en) * 2011-12-26 2013-07-08 Taiheiyo Materials Corp Expansive additive composition and concrete
KR101470511B1 (en) * 2013-03-14 2014-12-08 (주)인트켐 Additive for Slag Cement, Slag Cement and Slag Concrete thereof

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JP2001064053A (en) * 1999-08-25 2001-03-13 Denki Kagaku Kogyo Kk Cement admixture and cement composition
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JP2008239392A (en) * 2007-03-27 2008-10-09 Denki Kagaku Kogyo Kk Expansive admixture, cement composition, and cement hardened body formed by using the same
JP2010006680A (en) * 2008-06-30 2010-01-14 Taiheiyo Materials Corp Expansive composition and expansive material
WO2012077418A1 (en) * 2010-12-08 2012-06-14 電気化学工業株式会社 Cement admixture, cement composition, and hexavalent chromium reduction method using same
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JP2013133245A (en) * 2011-12-26 2013-07-08 Taiheiyo Materials Corp Expansive additive composition and concrete
KR101470511B1 (en) * 2013-03-14 2014-12-08 (주)인트켐 Additive for Slag Cement, Slag Cement and Slag Concrete thereof

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