JPH11246260A - Cement composition and method for producing hardened body using same - Google Patents
Cement composition and method for producing hardened body using sameInfo
- Publication number
- JPH11246260A JPH11246260A JP5094398A JP5094398A JPH11246260A JP H11246260 A JPH11246260 A JP H11246260A JP 5094398 A JP5094398 A JP 5094398A JP 5094398 A JP5094398 A JP 5094398A JP H11246260 A JPH11246260 A JP H11246260A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- cement composition
- weight
- gypsum
- composition
- 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.)
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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
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/06—Calcium sulfate cements starting from anhydrite
-
- 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
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/1062—Halogen free or very low halogen-content materials
- C04B2111/1068—Halogens other than chlorine
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
(57)【要約】
【課題】本発明は、前養生時間を１時間以内に短縮して
も、脱型強度の改善された硬化体を与えるセメント組成
物、及び、該セメント組成物を使用して行なう脱型強度
の改善された硬化体製造方法の提供を目的とする。
【解決手段】本発明は、ポルトランドセメント及び組成
物の１〜３重量％の無水せっこうよりなり、該無水せっ
こう中の全フッ素含有量が１．０重量％であるセメント
組成物に関する。(57) [Problem] To provide a cement composition which gives a hardened body having improved demolding strength even if the pre-curing time is shortened to one hour or less, and to use the cement composition. To provide a method for producing a cured product having improved demolding strength. The present invention relates to a Portland cement and a cement composition comprising 1-3% by weight of anhydrous gypsum of the composition, wherein the total fluorine content in the anhydrous gypsum is 1.0% by weight.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、初期強度の高いセ
メント二次製品を与えるセメント組成物と、それを使用
して高い初期強度を有する硬化体を製造する方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement composition for providing a cement secondary product having a high initial strength, and a method for producing a cured product having a high initial strength by using the same.
【０００２】[0002]
【従来の技術】セメントボード、コンクリート二次製品
等のセメント二次製品は、混練、成形、前養生、蒸気養
生、仕上げ工程を経て製造されるが、生産速度の向上、
エネルギーコストの削減のために、前養生と蒸気養生時
間の短縮が大きな課題の一つとなっている。蒸気養生時
間については、セメントの初期水和反応性を向上させる
ことがその短縮に有効な方法であることから種々の方法
が検討されているが、中でも、セメント中のせっこう量
を増すことがその最も有力な方法の一つであり、これ迄
に多くの研究が為されている。例えば、特開平８−２６
８７３６号公報には、混合セメントにせっこうをＳＯ3
換算で２．１重量％添加することで、蒸気養生後の圧縮
強度が増大することが報告されている。同様な報告は昭
和４８年にも既に見られ、高炉セメントから調製した硬
化体の蒸気養生後の圧縮強度がせっこう量に依存するこ
とが報告されている［セメント技術年報，Ｎｏ．２１，
ｐ．７５〜７９，１９７３］。2. Description of the Related Art Cement secondary products such as cement boards and concrete secondary products are manufactured through kneading, molding, pre-curing, steam curing and finishing processes.
One of the major issues is to shorten the pre-curing and steam curing times in order to reduce energy costs. Regarding the steam curing time, various methods have been studied because improving the initial hydration reactivity of the cement is an effective method for shortening it, but among them, increasing the amount of gypsum in the cement is This is one of the most influential methods, and much research has been done so far. For example, JP-A-8-26
No. 8736 discloses that gypsum is mixed with SO 3
It has been reported that the addition of 2.1% by weight in terms of conversion increases the compressive strength after steam curing. A similar report has already been found in 1973, and it has been reported that the compressive strength of a cured product prepared from blast furnace cement after steam curing depends on the amount of gypsum [Annual Report on Cement Technology, No. 21,
p. 75-79, 1973].
【０００３】一方、前養生時間（混練終了から養生まで
の時間、前置時間とも言う）については、セメント硬化
体を蒸気養生する場合、２〜４時間の前養生時間を取ら
ないと強度発現性が低下することは良く知られている。
例えば、上述した、せっこうを添加して初期水和反応性
を向上させる方法を実際の工程に適用したところ、前養
生時間を２時間以上取れば、確かに所期の効果を発現す
るが、前養生時間を１時間にすると、所期の効果を発現
しないことが確かめられている。この前養生時間は、セ
メント硬化体の生産速度を向上させる上での一つの障害
となっており、この時間を１時間以内とすることが望ま
れるが、短縮された前養生時間で強度発現性を改善する
方法については、報告がないのが現状である。[0003] On the other hand, the pre-curing time (time from completion of kneading to curing, also referred to as pre-heating time), when steam-curing a hardened cement, requires a pre-curing time of 2 to 4 hours to develop strength. Is well known to decrease.
For example, when the above-mentioned method of adding gypsum to improve the initial hydration reactivity is applied to an actual process, if the pre-curing time is 2 hours or more, the intended effect is certainly exhibited, It has been confirmed that the desired effect is not exhibited when the pre-curing time is set to 1 hour. This pre-curing time is one of the obstacles to improving the production speed of the hardened cement, and it is desired that the time be within one hour. There is no report on how to improve the situation.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、前養生時間
を１時間以内に短縮しても、脱型強度の改善された硬化
体を与えるセメント組成物、及び、該セメント組成物を
使用して行なう脱型強度の改善された硬化体製造方法の
提供を目的とする。DISCLOSURE OF THE INVENTION The present invention relates to a cement composition which gives a cured product having improved demolding strength even if the pre-curing time is shortened to one hour or less, and a method of using the cement composition. To provide a method for producing a cured product having improved demolding strength.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、所定量の
フッ素を含有する不溶性無水せっこう添加が、前養生時
間を短縮しても、蒸気養生後の圧縮強度の増加に効果が
あることを見出し、本発明を完成した。すなわち、本発
明は、ポルトランドセメント及び組成物の１〜３重量％
の無水せっこうよりなり、該無水せっこう中の全フッ素
含有量が１．０重量％であるセメント組成物に関する。
また、本発明は、ポルトランドセメント及び組成物の１
〜３重量％の無水せっこうよりなり該無水せっこう中の
全フッ素含有量が１．０重量％以下であるセメント組成
物、骨材、水、および混和剤の混合物を成形後、２０〜
６０分の前養生を行なった後、２〜５時間養生すること
を特徴とする、セメント硬化体の製造方法に関する。以
下に、本発明を詳細に説明する。The present inventors have found that the addition of insoluble anhydrous gypsum containing a predetermined amount of fluorine is effective in increasing the compressive strength after steam curing even if the pre-curing time is shortened. Thus, the present invention has been completed. That is, the present invention relates to Portland cement and 1-3% by weight of the composition.
And a total fluorine content in the anhydrous gypsum of 1.0% by weight.
The present invention also relates to Portland cement and composition 1
After molding a mixture of a cement composition, aggregate, water, and an admixture, which is composed of 〜3% by weight of anhydrous gypsum and whose total fluorine content in the anhydrous gypsum is 1.0% by weight or less,
The present invention relates to a method for producing a hardened cement, characterized in that after pre-curing for 60 minutes, curing is performed for 2 to 5 hours. Hereinafter, the present invention will be described in detail.
【０００６】[0006]
【発明の実施の形態】本発明のセメント組成物は、セメ
ントに無水せっこうを添加して成る。セメントとして
は、ＪＩＳ Ｒ ５２１０「ポルトランドセメントの品
質規定」に記載されているものは何れも問題なく使用で
きるが、初期強度の面から、早強ポルトランドセメント
の使用が特に好ましい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The cement composition of the present invention is obtained by adding anhydrous gypsum to cement. As the cement, any of those described in JIS R 5210 “Portland Cement Quality Regulation” can be used without any problem, but from the viewpoint of the initial strength, the use of early-strength Portland cement is particularly preferred.
【０００７】一方、せっこうは、不溶性無水せっこうを
使用することが必須要件であり、半水せっこう及び二水
せっこうでは効果がない。また、不溶性無水せっこう中
に含まれるフッ素の量は１重量％以下であることも必要
である。不溶性無水せっこうは、フッ素の含有量が１重
量％以下であれば、天然無水せっこう或いはふっ酸無水
せっこうの何れもが問題なく使用できる。On the other hand, for gypsum, it is essential to use insoluble anhydrous gypsum, and gypsum hemihydrate and gypsum have no effect. Further, it is necessary that the amount of fluorine contained in the insoluble anhydrous gypsum is 1% by weight or less. As the insoluble gypsum, as long as the content of fluorine is 1% by weight or less, either natural gypsum or gypsum anhydride can be used without any problem.
【０００８】不溶性無水せっこうの添加量は、セメント
組成物全体の１〜３重量％とする。不溶性無水せっこう
の添加量が１重量％より少ないと十分な添加効果が発現
せず、３重量％より大であると、機構は分からないが、
マイナス効果が大きくなり、何れに於ても、蒸気養生後
の圧縮強度の向上を図ることは出来ない。[0008] The amount of the insoluble anhydrous gypsum is 1 to 3% by weight of the whole cement composition. If the amount of the insoluble anhydrous gypsum is less than 1% by weight, a sufficient effect of addition is not exhibited, and if it is more than 3% by weight, the mechanism is unknown, but
The negative effect becomes large, and in any case, it is impossible to improve the compressive strength after steam curing.
【０００９】本発明のセメント組成物は、ポルトランド
セメントに、特定のスペックのせっこうを特定量添加し
た組成より成るが、これ等必須成分に加えて１５〜４０
重量％の量で、高炉スラグ微粉末、フライアッシュ、石
灰石微粉末等、公知の無機系混和材を添加することもで
きる。これ等の無機系混和材は、強度、流動性に影響を
与えることなくコスト低減に繋がり、特に、早強ポルト
ランドセメントを使用する場合にその効果が大きい。無
機系混和材は、２０００〜１００００ｃｍ2 ／ｇのブレ
ーン比表面積を有する微粉末の使用が好ましく、初期強
度発現性の点から、高炉スラグ微粉末或いは石灰石微粉
末の添加が最も好ましい。[0009] The cement composition of the present invention is composed of Portland cement with a specific amount of gypsum of a specific specification added thereto.
Known inorganic admixtures such as blast furnace slag fine powder, fly ash, and limestone fine powder can be added in an amount of% by weight. These inorganic admixtures lead to cost reduction without affecting strength and fluidity, and are particularly effective when using early-strength Portland cement. As the inorganic admixture, it is preferable to use a fine powder having a Blaine specific surface area of 2000 to 10000 cm 2 / g, and from the viewpoint of initial strength development, it is most preferable to add a blast furnace slag fine powder or a limestone fine powder.
【００１０】ポルトランドセメントおよび不溶性無水せ
っこうを必須成分とし、必要に応じて無機系混和材を添
加する本発明のセメント組成物は、使用に際して、それ
を構成する各成分を、骨材、減水剤、高性能ＡＥ減水剤
等の化学混和剤等の、モルタルまたはコンクリート調製
の際に一般に使用される他の材料とを混合しても良い
が、予めセメント組成物のみを混合調製して置き、使用
に当たって骨材、混和剤等の他の材料と混合するのが最
も好ましい方法である。化学混和剤はＪＩＳ Ｒ ６２
０４「コンクリート用化学混和剤」に記載されている、
スルフォン酸系、メラミン系、ポリカルボン酸系の何れ
もが使用できるが、中でもポリカルボン酸系の減水剤あ
るいは高性能ＡＥ減水剤が特に好ましい結果を与える。[0010] The cement composition of the present invention, comprising Portland cement and insoluble anhydrous gypsum as essential components and optionally adding an inorganic admixture, comprises, when used, the components constituting the aggregate, aggregate and water reducing agent. It may be mixed with other materials generally used in the preparation of mortar or concrete, such as a chemical admixture such as a high-performance AE water reducing agent. In this case, the most preferable method is to mix with other materials such as aggregate and admixture. Chemical admixture is JIS R 62
04 "Chemical admixture for concrete"
Any of a sulfonic acid type, a melamine type, and a polycarboxylic acid type can be used. Among them, a polycarboxylic acid type water reducing agent or a high performance AE water reducing agent gives particularly preferable results.
【００１１】本発明のセメント組成物と、骨材、化学混
和剤及び水とを混練して調製したモルタルまたはコンク
リートは、成形、蒸気養生してセメント硬化体とするこ
とができるが、従来行なわれていた方法と大きく異なる
点は、蒸気養生に先立って行なう前養生時間の１時間以
内への短縮が可能なことである。本発明のセメント組成
物は、使用するポルトランドセメント種、組成比にもよ
るが、２０〜６０分の前養生時間を取れば、２〜５時間
の蒸気養生後に、強度特性に優れたセメント硬化体を与
える。前養生時間をこれより長く設定しても、生成する
モルタルまたはコンクリートに特性面での問題は生じな
いが、大きな意味はない。以下に、具体的例を挙げて、
本発明を更に詳しく説明する。The mortar or concrete prepared by kneading the cement composition of the present invention with an aggregate, a chemical admixture and water can be molded and steam-cured to obtain a hardened cement. The major difference from the conventional method is that the pre-curing time performed prior to the steam curing can be reduced to within one hour. Although the cement composition of the present invention depends on the type of Portland cement used and the composition ratio, if a pre-curing time of 20 to 60 minutes is taken, a cured cement body having excellent strength properties after steam curing for 2 to 5 hours. give. If the pre-curing time is set longer, the resulting mortar or concrete does not cause any problem in properties, but has no significant meaning. Below, specific examples,
The present invention will be described in more detail.
【００１２】[0012]
【実施例】実施例１ セメント組成物構成成分としての普通ポルトランドセメ
ントおよびフッ素含有量０．５重量％のふっ酸無水せっ
こう、細骨材、および３．１重量％のナフタレン系減水
剤を含む水道水を、２０℃の恒温室においてホバートミ
キサーで３分間混練し、モルタル中の単位量が、セメン
ト組成物（せっこう含有量２重量％）：６５１ｋｇ／ｍ
3 、水：２７６ｋｇ／ｍ3 、細骨材：１２７２ｋｇ／ｍ
3 であるモルタルを調製した。得られたモルタルは、Ｊ
ＩＳ Ｒ ５２０１「セメントの物理試験方法」記載の
フローコーンを用いて０打でのフローを測定後、径５０
ｍｍ×高さ１００ｍｍの円筒形鋼製型枠に打ち込んだ。
混練開始から３０分間の前養生時間が経過した後、温度
７０℃、相対湿度９８％に保った恒温恒湿器に入れ３時
間の蒸気養生を行なった。養生終了後、恒温恒湿器より
硬化体を取り出し、ＪＩＳ Ａ １１０８「コンクリー
トの圧縮試験方法」に規定されている方法に準じて、圧
縮強度（脱型強度）を測定した。結果を表１に示す。EXAMPLES Example 1 Including ordinary Portland cement as a constituent of a cement composition, hydrofluoric anhydride gypsum having a fluorine content of 0.5% by weight, fine aggregate, and 3.1% by weight of a naphthalene-based water reducing agent Tap water is kneaded with a Hobart mixer in a constant temperature room at 20 ° C. for 3 minutes, and the unit amount in the mortar is a cement composition (gypsum content 2% by weight): 651 kg / m.
3 , water: 276 kg / m 3 , fine aggregate: 1272 kg / m
A mortar of 3 was prepared. The mortar obtained is J
After measuring the flow at 0 strokes using a flow cone described in IS R5201 “Physical Testing Method of Cement,” the diameter was 50 mm.
It was driven into a cylindrical steel mold having a height of 100 mm and a height of 100 mm.
After a lapse of 30 minutes of pre-curing time from the start of kneading, the mixture was placed in a thermo-hygrostat maintained at a temperature of 70 ° C. and a relative humidity of 98%, and subjected to steam curing for 3 hours. After the curing, the cured product was taken out of the thermo-hygrostat, and the compressive strength (demolding strength) was measured according to the method specified in JIS A 1108 “Method of compressive test for concrete”. Table 1 shows the results.
【００１３】[0013]
【表１】 [Table 1]
【００１４】比較例１〜４ ここでは、せっこうとして半水または二水せっこうを使
用した例（比較例１、２）及びフッ素含有量の多い無水
せっこうを使用した例（比較例３）を示す。せっこう種
を変えた以外は実施例１と同様の方法でモルタルおよび
硬化体を調製し、モルタルフローと脱型強度を測定し
た。結果を表１に示す。Comparative Examples 1 to 4 Here, examples using gypsum hemihydrate or dihydrate gypsum (Comparative Examples 1 and 2) and examples using anhydrous gypsum having a high fluorine content (Comparative Example 3) Is shown. A mortar and a cured product were prepared in the same manner as in Example 1 except that the gypsum species was changed, and the mortar flow and the demolding strength were measured. Table 1 shows the results.
【００１５】実施例２及び比較例４〜６ ここでは、不溶性無水せっこう添加量を変化させた例を
示す。ふっ酸無水せっこうの添加量を変えた以外は実施
例１と同様の方法でモルタルおよび硬化体を調製し、モ
ルタルフローと脱型強度を測定した。結果を表１に示
す。Example 2 and Comparative Examples 4 to 6 Here, examples are shown in which the amount of insoluble anhydrous gypsum is changed. A mortar and a cured product were prepared in the same manner as in Example 1 except that the addition amount of hydrofluoric anhydride gypsum was changed, and the mortar flow and demolding strength were measured. Table 1 shows the results.
【００１６】実施例３〜５ ここでは、セメント種を早強ポルトランドセメントに変
え且つ、無機系混和材を添加した例を、モルタル及びコ
ンクリートについて示す。モルタル（実施例３、４）に
ついては、モルタル中の単位量が、セメント組成物（ポ
ルトランドセメント、不溶性無水せっこう、高炉スラグ
（ブレーン比表面積４０００ｃｍ2 ／ｇ、実施例３）ま
たは石灰石（ブレーン比表面積４５００ｃｍ2 ／ｇ、実
施例４）微粉末の合量）：６５１ｋｇ／ｍ3 、水：２７
７ｋｇ／ｍ3 、細骨材：１２５８ｋｇ／ｍ3 となるよう
にした他は実施例１と同様にモルタルおよび硬化体を調
製し、モルタルフローと脱型強度を測定した。一方、コ
ンクリート（実施例５）については、原料を２０℃の恒
温室でパン型ミキサーを用いて２分間混練し、単位量
を、セメント組成物（ポルトランドセメント、不溶性無
水せっこう、高炉スラグ粉末の合量）：４００ｋｇ／ｍ
3 、水：１７０ｋｇ／ｍ3 、細骨材：７７３ｋｇ／
ｍ3 、粗骨材：１０２０ｋｇ／ｍ3 としたコンクリート
のスランプを測定した後、径１００ｍｍ×高さ２００ｍ
ｍの円筒型枠に打ち込んだ。混練開始から３０分経過
後、蒸気養生室に入れ、４０℃／時間の速度で７０℃ま
で昇温した。混練開始から３．５時間経過後、蒸気養生
室から取り出し、ＪＩＳ Ａ １１０８「コンクリート
の圧縮試験方法」に規定されている方法により、圧縮強
度（脱型強度）を測定した。結果を表１に示す。Examples 3 to 5 Here, examples in which the cement type is changed to early-strength Portland cement and an inorganic admixture is added are shown for mortar and concrete. As for the mortar (Examples 3 and 4), the unit amount in the mortar was determined by the cement composition (Portland cement, insoluble anhydrous gypsum, blast furnace slag (Brain specific surface area 4000 cm 2 / g, Example 3) or limestone (Brain ratio Surface area 4500 cm 2 / g, Example 4) total amount of fine powder): 651 kg / m 3 , water: 27
7 kg / m 3, fine aggregate: except that was set to be 1258kg / m 3 is prepared like in the mortar and cured product of Example 1 was measured demolding strength mortar flow. On the other hand, for concrete (Example 5), the raw materials were kneaded for 2 minutes using a pan-type mixer in a constant temperature room at 20 ° C., and the unit amount was changed to the cement composition (Portland cement, insoluble anhydrous gypsum, blast furnace slag powder). Combined amount): 400 kg / m
3 , water: 170 kg / m 3 , fine aggregate: 773 kg /
m 3 , coarse aggregate: 1020 kg / m 3 After measuring a slump of concrete, the diameter was 100 mm × height 200 m.
m into a cylindrical formwork. After a lapse of 30 minutes from the start of kneading, the mixture was placed in a steam curing room and heated to 70 ° C. at a rate of 40 ° C./hour. After 3.5 hours from the start of kneading, the mixture was taken out of the steam curing room, and the compressive strength (demolding strength) was measured by a method specified in JIS A 1108 “Method of compressive test for concrete”. Table 1 shows the results.
【００１７】実施例として示した本発明のセメント組成
物は何れも、僅か３０分の前養生時間でも、蒸気養生直
後の圧縮強度（脱型強度）発現性に優れたモルタルまた
はコンクリート硬化体を与えることが分かる。それに対
し、せっこう種、せっこう量、せっこう中のフッ素含有
量何れかの要因が本発明の範囲を外れたセメント組成物
では、蒸気養生直後のモルタル硬化体の脱型強度は低
い。尚、これ等についても、前養生を２時間以上行なえ
ば、十分な脱型強度の発現したモルタル硬化体を与えも
のがあることも考えられる。Each of the cement compositions of the present invention shown as examples gives a mortar or concrete hardened body having excellent compressive strength (demolding strength) immediately after steam curing even with a pre-curing time of only 30 minutes. You can see that. On the other hand, in the cement composition in which any of the factors of the gypsum species, the amount of gypsum, and the fluorine content in the gypsum are out of the range of the present invention, the demolding strength of the mortar hardened body immediately after steam curing is low. It is also conceivable that some of these may provide a mortar cured product exhibiting sufficient demolding strength if the pre-curing is performed for 2 hours or more.
【００１８】[0018]
【発明の効果】本発明のセメント組成物は、従来２時間
以上は必要であった前養生時間の１時間以内への短縮を
可能にした。これは、セメント二次製品の生産速度を向
上させる上での課題の一つを解決したことを意味する。The cement composition of the present invention has made it possible to shorten the pre-curing time, which was conventionally required for two hours or more, to one hour or less. This means that one of the problems in improving the production speed of cement secondary products has been solved.
Claims (5)
〜３重量％量の不溶性無水せっこうよりなり、該不溶性
無水せっこう中の全フッ素含有量が１．０重量％以下で
あるセメント組成物。1. Portland cement and 1 of the whole composition
A cement composition comprising an insoluble anhydrous gypsum in an amount of about 3% by weight and a total fluorine content in the insoluble anhydrous gypsum of 1.0% by weight or less.
の１５〜４０重量％の無機系混和材を含むセメント組成
物。2. A cement composition comprising, in addition to the components of claim 1, 15 to 40% by weight of the total composition of an inorganic admixture.
石灰石微粉末である、請求項２に記載のセメント組成
物。3. The cement composition according to claim 2, wherein the inorganic admixture is blast furnace slag fine powder or limestone fine powder.
ドセメントである、請求項１から３までの何れかに記載
のセメント組成物。4. The cement composition according to claim 1, wherein the Portland cement is an early-strength Portland cement.
ント組成物、骨材、化学混和剤及び水との混合物を成形
後、２０〜６０分間の前養生を行なった後、２〜５時間
蒸気養生する、セメント硬化体の製造方法。5. After molding a mixture of the cement composition, aggregate, chemical admixture and water according to any one of claims 1 to 4, after pre-curing for 20 to 60 minutes, A method for producing a hardened cement, which is steam cured for 5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5094398A JP3584723B2 (en) | 1998-03-03 | 1998-03-03 | Manufacturing method of hardened cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5094398A JP3584723B2 (en) | 1998-03-03 | 1998-03-03 | Manufacturing method of hardened cement |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003365768A Division JP2004035407A (en) | 2003-10-27 | 2003-10-27 | Cement composition and method for producing hardened body using same |
| JP2004143956A Division JP4301076B2 (en) | 2004-05-13 | 2004-05-13 | Cement composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11246260A true JPH11246260A (en) | 1999-09-14 |
| JP3584723B2 JP3584723B2 (en) | 2004-11-04 |
Family
ID=12872915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5094398A Expired - Lifetime JP3584723B2 (en) | 1998-03-03 | 1998-03-03 | Manufacturing method of hardened cement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3584723B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002160959A (en) * | 2000-09-13 | 2002-06-04 | Denki Kagaku Kogyo Kk | Cement composition |
| KR100360115B1 (en) * | 1999-12-21 | 2002-11-04 | 주식회사 한중 | A method for manufacturing solidification brick |
| KR100362087B1 (en) * | 1999-12-01 | 2002-11-23 | 한일시멘트 (주) | The method for manufacturing of composition of cement |
| KR100474964B1 (en) * | 2001-10-23 | 2005-03-08 | 한일시멘트 (주) | The composition for height-intensity compound of cement |
| KR100474976B1 (en) * | 2001-10-23 | 2005-03-08 | 한일시멘트 (주) | The method for manufacturing of composition for height-intensity concrete |
| KR100609136B1 (en) * | 2000-12-21 | 2006-08-04 | 재단법인 포항산업과학연구원 | Manufacturing method of solidification brick |
| CN102531429A (en) * | 2012-01-16 | 2012-07-04 | 郑慧 | Method for synergetically treating fluorine-containing sludge in cement kiln |
| JP2020093951A (en) * | 2018-12-12 | 2020-06-18 | 鹿島建設株式会社 | Cement composition, concrete, concrete-hardened body, and concrete structure |
-
1998
- 1998-03-03 JP JP5094398A patent/JP3584723B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100362087B1 (en) * | 1999-12-01 | 2002-11-23 | 한일시멘트 (주) | The method for manufacturing of composition of cement |
| KR100360115B1 (en) * | 1999-12-21 | 2002-11-04 | 주식회사 한중 | A method for manufacturing solidification brick |
| JP2002160959A (en) * | 2000-09-13 | 2002-06-04 | Denki Kagaku Kogyo Kk | Cement composition |
| KR100609136B1 (en) * | 2000-12-21 | 2006-08-04 | 재단법인 포항산업과학연구원 | Manufacturing method of solidification brick |
| KR100474964B1 (en) * | 2001-10-23 | 2005-03-08 | 한일시멘트 (주) | The composition for height-intensity compound of cement |
| KR100474976B1 (en) * | 2001-10-23 | 2005-03-08 | 한일시멘트 (주) | The method for manufacturing of composition for height-intensity concrete |
| CN102531429A (en) * | 2012-01-16 | 2012-07-04 | 郑慧 | Method for synergetically treating fluorine-containing sludge in cement kiln |
| JP2020093951A (en) * | 2018-12-12 | 2020-06-18 | 鹿島建設株式会社 | Cement composition, concrete, concrete-hardened body, and concrete structure |
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|---|---|
| JP3584723B2 (en) | 2004-11-04 |
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