JPH05116996A - Cement admixture and production of cement hardened body - Google Patents
Cement admixture and production of cement hardened bodyInfo
- Publication number
- JPH05116996A JPH05116996A JP30539391A JP30539391A JPH05116996A JP H05116996 A JPH05116996 A JP H05116996A JP 30539391 A JP30539391 A JP 30539391A JP 30539391 A JP30539391 A JP 30539391A JP H05116996 A JPH05116996 A JP H05116996A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- gypsum
- weight
- strength
- blast furnace
- 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.)
- Withdrawn
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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
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]
【産業上の利用分野】本発明は、セメント混和材及びセ
メント硬化体の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement admixture and a method for producing a cement hardened product.
【０００２】[0002]
【従来の技術】機械的強度が高いモルタルやコンクリー
ト等のセメント硬化体を製造する方法としてはセメント
を結合材として含有する組成物をオートクレーブ養生す
る方法が知られている。この方法は高強度の硬化体を短
時間に製造できる点で極めて優れている。しかし、オー
トクレーブ養生には硬化体の大きさに見合う大規模な装
置を必要とするため、生産規模によっては、必ずしも汎
用的な方法とは言えない。そこで、蒸気養生で高強度の
硬化体を製造するための結合材の開発が行われており、
通常のセメントに石膏を配合したものを結合材として使
用すると、蒸気養生するだけで、比較的高強度の硬化体
を製造できることが知られている（特公昭５６−４０１
０４号公報、特公昭５８−５２９４３号公報、特開昭５
７−１４５０５５号公報）。また、石膏を配合するセメ
ントとして高炉セメントを使用すると、硬化前のセメン
ト組成物の流動性が向上して成形性がよくなるとともに
硬化体の耐久性がよくなることが知られている（特公昭
５３−２２０８４号公報、特開平１−１８９５６号公
報、特開平２−２８９４５３号公報、特開平３−１５０
２５０号公報）。しかし、養生条件を変えることにより
硬化体の強度発現性を比較的容易に調節できるオートク
レーブ養生による方法と比較すると、強度発現の上限が
あり、セメント硬化体の用途によっては不十分な場合が
ある。2. Description of the Related Art As a method for producing a hardened cement such as mortar or concrete having high mechanical strength, a method of curing an autoclave with a composition containing cement as a binder is known. This method is extremely excellent in that a high-strength cured product can be produced in a short time. However, autoclave curing requires a large-scale device corresponding to the size of the cured product, and therefore cannot be said to be a general-purpose method depending on the production scale. Therefore, the development of a binder for producing a cured product of high strength by steam curing,
It is known that a relatively high-strength hardened product can be produced only by steam curing, when ordinary cement mixed with gypsum is used as a binder (Japanese Patent Publication No. 56-401).
04, JP-B-58-52943, JP-A-5
7-145055). Further, it is known that when blast furnace cement is used as a cement to which gypsum is mixed, the fluidity of the cement composition before hardening is improved, the moldability is improved and the durability of the hardened product is improved (Japanese Patent Publication No. 53-53- 22084, JP-A-1-18956, JP-A-2-289453, and JP-A-3-150.
No. 250). However, compared with the method by autoclave curing, in which the strength development of the hardened product can be adjusted relatively easily by changing the curing conditions, there is an upper limit of the strength development, and it may be insufficient depending on the use of the hardened cement product.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、蒸気
養生によって高強度のセメント硬化体を製造するために
有効なセメント混和材を提供することにある。また、蒸
気養生によって高強度のセメント硬化体を製造する方法
を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a cement admixture effective for producing a high-strength cement hardened product by steam curing. Another object of the present invention is to provide a method for producing a high-strength cement hardened body by steam curing.
【０００４】本発明者は、上記のような課題を解決する
ために研究を行った結果、高炉スラグ微粉末及び石膏類
からなるセメント混和材に、炭酸カルシウムを添加した
混和材を使用すると硬化体の強度発現性が更に良好にな
ることを見出して本発明を完成した。The present inventor has conducted research to solve the above-mentioned problems, and as a result, when a cement admixture composed of blast furnace slag fine powder and gypsum was used as an admixture containing calcium carbonate, a cured product was obtained. The inventors of the present invention completed the present invention by finding that the strength development property of (1) is further improved.
【０００５】すなわち、本発明は、ブレーン比表面積２
０００cm2 ／ｇ以上の高炉スラグ微粉末に、該高炉スラ
グ微粉末１００重量部に対して１０〜１００重量部の石
膏類（無水物として換算）と５〜５０重量部の炭酸カル
シウムとを配合してなる組成物を主成分とするセメント
混和材である。また、前記セメント混和材とクリンカ粉
又はセメントとを混合してなる組成物であって石膏類含
有量（無水物として換算）と炭酸カルシウム含有量との
和が５〜１５重量％である組成物を結合材を含有として
セメント組成物を成形した後に蒸気養生することを特徴
とする高強度セメント硬化体の製造方法である。That is, the present invention has a Blaine specific surface area of 2
A blast furnace slag fine powder of 000 cm 2 / g or more was mixed with 10 to 100 parts by weight of gypsum (calculated as an anhydride) and 5 to 50 parts by weight of calcium carbonate based on 100 parts by weight of the blast furnace slag fine powder. It is a cement admixture containing a composition as a main component. A composition obtained by mixing the cement admixture with clinker powder or cement, wherein the sum of the gypsum content (calculated as an anhydride) and the calcium carbonate content is 5 to 15% by weight. Is a method for producing a high-strength cement hardened product, which is characterized in that the cement composition is molded with the binder contained therein and then steam-cured.
【０００６】先ず、本発明のセメント混和材について説
明する。高炉スラグ微粉末としては、高炉で銑鉄を製造
する際に副生する高炉スラグを溶融状態で水冷・破砕し
て得られる水砕スラグを粉砕又は粉砕及び分級して得ら
れる水砕スラグ微粉末が好ましい。ただし、ブレーン比
表面積が２０００cm2 ／ｇ未満のものを使用すると、セ
メント硬化体の強度発現性が悪化するのでブレーン比表
面積が２０００cm2 ／ｇ以上好ましくは４０００〜１２
０００cm2 ／ｇになるように粉砕又は粉砕及び分級した
ものを使用する。First, the cement admixture of the present invention will be described. As the blast furnace slag fine powder, a water granulated slag fine powder obtained by crushing or crushing and classifying a water granulated slag obtained by water cooling and crushing the blast furnace slag that is a byproduct when producing pig iron in a blast furnace in a molten state preferable. However, when the one having a Blaine specific surface area of less than 2000 cm 2 / g is used, the strength development of the hardened cement is deteriorated, so that the Blaine specific surface area is 2000 cm 2 / g or more, preferably 4000 to 12
Use the one crushed or crushed and classified so as to be 000 cm 2 / g.
【０００７】石膏類としては、無水石膏又は二水石膏が
好ましい。特に、二水石膏を単独で使用するか又は二水
石膏と無水石膏とを併用し、しかも無水石膏の使用量を
二水石膏の使用量と同量以下とするのがよい。また、ブ
レーン比表面積が２０００〜９０００cm2 ／ｇ特には４
０００〜７０００cm2 ／ｇのものが好ましい。この範囲
を外れるものを使用するとセメント硬化体の強度発現性
が悪い。なお、ブレーン比表面積が大きいものを使用す
る程、硬化前のセメント組成物の流動性が高くなる傾向
がある。石膏類の使用量は、無水石膏に換算して、高炉
スラグ微粉末１００重量部に対して１０〜１００重量部
好ましくは２０〜７０重量部である。The gypsum is preferably anhydrous gypsum or gypsum dihydrate. In particular, it is preferable to use gypsum dihydrate alone or to use gypsum dihydrate and gypsum anhydrate together, and to use the amount of gypsum anhydrate equal to or less than the amount of gypsum dihydrate used. The Blaine specific surface area is 2000 to 9000 cm 2 / g, especially 4
000 to 7,000 cm 2 / g is preferable. If a material out of this range is used, the hardened cement will have poor strength development. In addition, the larger the Blaine specific surface area, the higher the fluidity of the cement composition before curing tends to be. The amount of gypsum used is, in terms of anhydrous gypsum, 10 to 100 parts by weight, preferably 20 to 70 parts by weight, based on 100 parts by weight of the blast furnace slag fine powder.
【０００８】炭酸カルシウムの使用量は、高炉スラグ微
粉末１００重量部に対して５〜５０重量部であるが、石
膏類と同量以下使用するのが好ましい。The amount of calcium carbonate used is 5 to 50 parts by weight with respect to 100 parts by weight of the blast furnace slag fine powder, but it is preferable to use the same amount or less as gypsum.
【０００９】次に、本発明のセメント硬化体の製造方法
について説明する。結合材として、前記セメント混和材
とクリンカ粉又はセメントとを混合した組成物であって
無水物に換算した石膏含有量と炭酸カルシウム含有量と
の和が５〜２５重量％好ましくは１０〜２０重量％の組
成物を使用する。Next, a method for manufacturing the hardened cement product of the present invention will be described. As a binder, a composition in which the cement admixture and clinker powder or cement are mixed, and the sum of the gypsum content and calcium carbonate content converted to anhydrous is 5 to 25% by weight, preferably 10 to 20% by weight. % Of the composition is used.
【００１０】この結合材に、各種の骨材、水、必要に応
じて各種のセメント混和剤等を配合したセメント組成物
を成形して蒸気養生する。蒸気養生は温度３０〜１００
℃で５〜６０時間好ましくは２０〜４０時間行うのがよ
い。なお、蒸気養生を高温で行うほど短時間で高強度の
硬化体を製造できるが、高すぎると硬化体の表面にクラ
ックが発生しやすくなる。また、蒸気養生を長時間行う
ほど硬化体の強度が高くなる傾向がある。A cement composition, in which various aggregates, water, and various cement admixtures if necessary, are mixed with this binder, is molded and steam-cured. Steam curing temperature is 30-100
It is good to carry out at 60 ° C. for 5 to 60 hours, preferably 20 to 40 hours. It should be noted that a higher-strength cured product can be produced in a shorter time as the steam curing is performed at a higher temperature, but if it is too high, cracks are likely to occur on the surface of the cured product. Further, the strength of the cured product tends to increase as the steam curing is performed for a longer time.
【００１１】[0011]
実施例１〜４、比較例１、２ 無水物として換算した二水石膏の含有量が４．０重量％
のポルトランドセメント（Ｐ）、ブレーン比表面積が６
０００cm2 ／ｇの水砕スラグ微粉末（Ｓ）、ブレーン比
表面積５２００cm2 ／ｇの二水石膏（Ｇ−２）及び炭酸
カルシウム粉末（Ｃ）を表１に示す配合割合で混合した
組成物を結合材として使用し、結合材１００重量部に細
骨材１５５重量部、減水剤の６％水溶液２７重量部を配
合してなるモルタルを型枠に流し込みテーブルバイブレ
ータで成形して温度２０℃の条件で４時間前置き養生
し、次いで３９．５時間蒸気養生した後、放冷後所定材
令まで温度２０℃の条件で気乾養生した。蒸気養生は昇
温・降温を２回行い、最初７０℃まで昇温して４時間均
熱し、一旦降温してから再度９０℃まで昇温して６．５
時間均熱した後に温度４５℃まで降温した。表２にモル
タルのフロー値、各材令で脱型後の硬化体の曲げ強度及
び圧縮強度を示す。なお、フロー値試験及び強度試験は
ＪＩＳ−Ｒ−５２０１に準じて行った。Examples 1 to 4, Comparative Examples 1 and 2 The content of gypsum dihydrate converted as an anhydride is 4.0% by weight.
Portland cement (P) with a Blaine specific surface area of 6
000 cm 2 / g of granulated slag fine powder (S), Blaine specific surface area of 5200 cm 2 / g of gypsum dihydrate (G-2) and calcium carbonate powder (C) were mixed in the composition ratio shown in Table 1. Mortar, which is used as a binder and is composed of 100 parts by weight of binder, 155 parts by weight of fine aggregate and 27 parts by weight of 6% aqueous solution of a water-reducing agent, is poured into a mold and molded by a table vibrator, and the temperature is 20 ° C. After preliminarily curing for 4 hours, steam curing for 39.5 hours, and after air cooling, it was air-dried at a temperature of 20 ° C. until a predetermined age. In steam curing, the temperature is raised and lowered twice. First, the temperature is raised to 70 ° C and soaked for 4 hours, and once lowered, the temperature is raised to 90 ° C again for 6.5.
After soaking for an hour, the temperature was lowered to 45 ° C. Table 2 shows the flow value of mortar and the bending strength and compression strength of the cured product after demolding at each age. The flow value test and the strength test were performed according to JIS-R-5201.
【００１２】実施例５、比較例３ 無水物として換算した二水石膏の含有量が４．０重量％
のポルトランドセメント（Ｐ）、ブレーン比表面積が６
０００cm2 ／ｇの水砕スラグ微粉末（Ｓ）、ブレーン比
表面積５２００cm2 ／ｇの二水石膏（Ｇ−２）及び無水
石膏（Ｇ−０）並びに炭酸カルシウム粉末（Ｃ）を表３
に示す配合割合で混合した組成物を結合材として使用し
た他は実施例１〜４と同様に行った。表４にモルタルの
フロー値、各材令で脱型後の硬化体の曲げ強度及び圧縮
強度を示す。Example 5, Comparative Example 3 The content of gypsum dihydrate converted to anhydrous is 4.0% by weight.
Portland cement (P) with a Blaine specific surface area of 6
Table 3 shows the granulated slag fine powder (S) of 000 cm 2 / g, dihydrate gypsum (G-2) and anhydrous gypsum (G-0) and calcium carbonate powder (C) having a Blaine specific surface area of 5200 cm 2 / g.
The same procedure as in Examples 1 to 4 was carried out except that the composition mixed in the mixing ratio shown in was used as the binder. Table 4 shows the flow value of mortar, and the bending strength and compression strength of the cured product after demolding at each age.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】[0015]
【表３】 [Table 3]
【００１６】[0016]
【表４】 [Table 4]
【００１７】[0017]
【発明の効果】本発明によれば、蒸気養生により高強度
の硬化体を製造することができる。また、硬化前のセメ
ント組成物の流動性が高いので成形が容易である。According to the present invention, a high-strength cured product can be manufactured by steam curing. Moreover, since the cement composition before curing has high fluidity, it is easy to mold.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安永 亨 福岡県北九州市小倉北区中井２−４−３− 203 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yasunaga 2-4--3-203 Nakai, Kokurakita-ku, Kitakyushu, Fukuoka
Claims (2)
の高炉スラグ微粉末に、該高炉スラグ微粉末１００重量
部に対して１０〜１００重量部の石膏類（無水物として
換算）と５〜５０重量部の炭酸カルシウムとを配合して
なる組成物を主成分とするセメント混和材。1. A blast furnace slag fine powder having a Blaine specific surface area of 2000 cm 2 / g or more, and 10 to 100 parts by weight of gypsum (calculated as an anhydride) and 5 to 50 parts by weight based on 100 parts by weight of the blast furnace slag fine powder. A cement admixture whose main component is a composition obtained by blending part of calcium carbonate.
カ粉又はセメントとを混合してなる組成物であって石膏
類含有量（無水物として換算）と炭酸カルシウム含有量
との和が５〜２５重量％である組成物を結合材として含
有するセメント組成物を成形した後に蒸気養生すること
を特徴とする高強度セメント硬化体の製造方法。2. A composition obtained by mixing the cement admixture according to claim 1 and clinker powder or cement, wherein the sum of the gypsum content (calculated as an anhydride) and the calcium carbonate content is 5 to 5. A method for producing a high-strength cement hardened product, which comprises molding a cement composition containing 25% by weight of the composition as a binder and then steam curing the composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30539391A JPH05116996A (en) | 1991-10-24 | 1991-10-24 | Cement admixture and production of cement hardened body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30539391A JPH05116996A (en) | 1991-10-24 | 1991-10-24 | Cement admixture and production of cement hardened body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05116996A true JPH05116996A (en) | 1993-05-14 |
Family
ID=17944585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30539391A Withdrawn JPH05116996A (en) | 1991-10-24 | 1991-10-24 | Cement admixture and production of cement hardened body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05116996A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007046297A1 (en) * | 2005-10-17 | 2007-04-26 | Taiheiyo Cement Corporation | Cement additive and cement composition |
| JP2008179504A (en) * | 2007-01-24 | 2008-08-07 | Nippon Steel Corp | Blast furnace slag cement |
| JP2008201656A (en) * | 2007-01-24 | 2008-09-04 | Nippon Steel Corp | Sulfate-resisting cement |
| JP2012136434A (en) * | 2007-01-24 | 2012-07-19 | Nippon Steel Corp | Sulfate-resisting cement |
| JP2013139367A (en) * | 2012-01-06 | 2013-07-18 | Taisei Corp | Cement-based mixed material |
| JP2016023105A (en) * | 2014-07-22 | 2016-02-08 | 鹿島建設株式会社 | Concrete binder for blast furnace cement concrete |
-
1991
- 1991-10-24 JP JP30539391A patent/JPH05116996A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007046297A1 (en) * | 2005-10-17 | 2007-04-26 | Taiheiyo Cement Corporation | Cement additive and cement composition |
| US8133317B2 (en) | 2005-10-17 | 2012-03-13 | Taiheiyo Cement Corporation | Cement additive and cement composition |
| TWI393690B (en) * | 2005-10-17 | 2013-04-21 | Taiheiyo Cement Corp | Concrete addition materials and concrete compositions |
| JP2008179504A (en) * | 2007-01-24 | 2008-08-07 | Nippon Steel Corp | Blast furnace slag cement |
| JP2008201656A (en) * | 2007-01-24 | 2008-09-04 | Nippon Steel Corp | Sulfate-resisting cement |
| JP2012136434A (en) * | 2007-01-24 | 2012-07-19 | Nippon Steel Corp | Sulfate-resisting cement |
| JP2013139367A (en) * | 2012-01-06 | 2013-07-18 | Taisei Corp | Cement-based mixed material |
| JP2016023105A (en) * | 2014-07-22 | 2016-02-08 | 鹿島建設株式会社 | Concrete binder for blast furnace cement concrete |
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