JPH06287046A - Mixed cement - Google Patents
Mixed cementInfo
- Publication number
- JPH06287046A JPH06287046A JP5073781A JP7378193A JPH06287046A JP H06287046 A JPH06287046 A JP H06287046A JP 5073781 A JP5073781 A JP 5073781A JP 7378193 A JP7378193 A JP 7378193A JP H06287046 A JPH06287046 A JP H06287046A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- mixed
- surface area
- weight
- 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.)
- Granted
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
- C04B28/08—Slag 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
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、混合セメントに関する
ものである。さらに詳しくは本発明は、低発熱性、初期
強度および耐久性が改善された混合セメントに関するも
のである。FIELD OF THE INVENTION The present invention relates to a mixed cement. More specifically, the present invention relates to a mixed cement having low heat buildup, improved initial strength and durability.
【０００２】[0002]
【従来の技術】ダムや橋脚等のマスコンクリート構造物
においては、セメントの水和により発生した熱がコンク
リート矩体内に蓄積され温度が上昇する、いわゆる断熱
温度上昇の現象が著しい。これによりコンクリート構造
物には熱応力が発生し、温度ひび割れ等を引き起こし、
コンクリートの強度および耐久性を著しく損なう。その
ため従来のマスコンクリートには、ポルトランドセメン
トの構成鉱物の中で最も水和熱の大きなＣ3Ａ（３Ｃａ
Ｏ・Ａｌ2Ｏ3）の含有量を、普通ポルトランドセメント
の９％から５〜６％に低減し、またＣ2Ｓの含有量を若
干多くした中庸熱セメントが使用されてきた。しかし、
近年土木・建築構造物の大型化に対応して、さらに発熱
量を低減したセメントへの要求が高まり、従来の中庸熱
セメントでは性能的に十分ではない場合が多くなってい
る（なお、以下の説明において、ポルトランドセメント
の主成分を構成する水硬性鉱物３ＣａＯ・ＳｉＯ2、２
ＣａＯ・ＳｉＯ2、３ＣａＯ・Ａｌ2Ｏ3および４ＣａＯ
・Ａｌ2Ｏ3・Ｆｅ2Ｏ3をそれぞれＣ3Ｓ、Ｃ2Ｓ、Ｃ3Ａ
およびＣ4ＡＦと記載する）。2. Description of the Related Art In mass concrete structures such as dams and bridge piers, the phenomenon of so-called adiabatic temperature rise is remarkable, in which the heat generated by hydration of cement is accumulated in the concrete rectangle and the temperature rises. This causes thermal stress in the concrete structure, causing temperature cracks,
It significantly impairs the strength and durability of concrete. Therefore, conventional mass concrete has the largest heat of hydration C 3 A (3Ca) among the constituent minerals of Portland cement.
O.Al 2 O 3 ) content has been reduced from 9% of ordinary Portland cement to 5 to 6%, and moderate heat cement with slightly higher C 2 S content has been used. But,
In recent years, in response to the increase in the size of civil engineering and building structures, the demand for cement with a further reduced calorific value has increased, and the conventional medium-heat cement is often insufficient in performance (see below. In the description, the hydraulic minerals 3CaO.SiO 2 , 2, which are the main components of Portland cement,
CaO ・ SiO 2 , 3CaO ・ Al 2 O 3 and 4CaO
・ Al 2 O 3・ Fe 2 O 3 are added to C 3 S, C 2 S, and C 3 A, respectively.
And C 4 AF).
【０００３】そこで、上記のような中庸熱セメントに、
産業副産物である高炉スラグを多量（７０〜９０％）に
添加した二成分系混合セメント、また尚一層の低発熱化
を実現するために、ポルトランドセメントに、スラグお
よびフライアッシュを７０〜８０％も配合した超低発熱
性の三成分系混合セメント等が開発されている。また、
水和熱の大きいＣ3ＳおよびＣ3Ａの含有量を低減し、水
和熱の小さいＣ2Ｓ（ビーライト）含有量を増加させ
た、いわゆる高ビーライトセメントに高炉スラグおよび
水酸化カルシウムを配合した水硬性セメントも提案され
ている（特開平4-238847号公報）。Therefore, in the above-mentioned moderate heat cement,
70% to 80% of slag and fly ash are added to Portland cement in order to achieve further low heat generation by adding a large amount (70 to 90%) of blast furnace slag, which is an industrial by-product. An ultra-low exothermic ternary mixed cement has been developed. Also,
The content of C 3 S and C 3 A having a large heat of hydration was reduced, and the content of C 2 S (beelite) having a small heat of hydration was increased, so-called high belite cement was added to blast furnace slag and calcium hydroxide. A hydraulic cement containing the above is also proposed (Japanese Patent Laid-Open No. 4-238847).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、三成分
系セメントは、長期強度発現性が劣るため、コンクリー
トの単位セメント量を大きくするか、または水セメント
比を低減する必要があり、また、コンクリートの断熱温
度上昇を２５℃程度に低減できるが、ポルトランドセメ
ントの含有量が３０％以下と少量であり、スラグやフラ
イアッシュ等の混合材を多量に使用するため、コンクリ
ート中のアルカリ量の低減によっておこる各耐久性（と
くに耐中性化）の問題も心配されている。一方、高ビー
ライトセメントは、Ｃ2Ｓの含有量が多くなると、発熱
低減効果は得られるが、水和反応が遅延し、初期強度が
低く、脱型に支障をきたすなど実用化し難い問題点があ
る。また、水酸化カルシウムを混合する高ビーライトセ
メントは、水酸化カルシウムの製造に余分のコストがか
かり、保存時に変質する等の問題もある。本発明では、
従来の中庸熱セメントおよび二成分系セメントよりも著
しく優れた低発熱性、すなわち三成分系セメントと同等
もしくはそれ以上の低発熱性を実現するとともに、安価
で保存安定性に優れ、初期強度が改善され、しかも混合
材混入量の減少により耐久性（とくに耐中性化）が向上
された高ビーライトセメント系の混合セメントを提供す
ることを目的とするものである。However, since the three-component cement is inferior in long-term strength development, it is necessary to increase the unit cement amount of concrete or reduce the water-cement ratio. Although the adiabatic temperature rise can be reduced to about 25 ° C, the content of Portland cement is as small as 30% or less, and a large amount of mixed material such as slag and fly ash is used. There are also concerns about durability (especially resistance to neutralization). On the other hand, high belite cement has an effect of reducing heat generation when the content of C 2 S is high, but the hydration reaction is delayed, the initial strength is low, and the demolding is hindered. There is. Further, high belite cement mixed with calcium hydroxide has a problem in that it costs extra to produce calcium hydroxide and deteriorates during storage. In the present invention,
Achieves significantly lower heat generation than conventional medium heat cement and two-component cement, that is, low heat generation equivalent to or higher than three-component cement, inexpensive and excellent in storage stability, and improved initial strength. Further, it is an object of the present invention to provide a high belite cement-based mixed cement which has improved durability (particularly neutralization resistance) due to a decrease in the mixing amount of the mixed material.
【０００５】[0005]
【課題を解決するための手段】本発明者らは鋭意検討の
結果、上記のような従来の課題を解決することができ
た。すなわち本発明は、 （ａ）Ｃ2Ｓを６０〜９０重量％含有する低発熱性ポル
トランドセメントクリンカーから調製したポルトランド
セメント５５〜９０重量％； （ｂ）炭酸カルシウムを主成分とする比表面積が５００
０cm2／g以上の粉末５〜３０重量％；および （ｃ）比表面積が４０００cm2／g以上の高炉スラグ粉末
５〜４０重量％を含有してなる、混合セメントを提供す
るものである。As a result of earnest studies, the present inventors were able to solve the above-mentioned conventional problems. That is, the present invention provides: (a) 55 to 90% by weight of Portland cement prepared from a low heat-generating Portland cement clinker containing 60 to 90% by weight of C 2 S; (b) a specific surface area containing calcium carbonate as a main component of 500
The present invention provides a mixed cement, which comprises 5 to 30% by weight of powder of 0 cm 2 / g or more; and (c) 5 to 40% by weight of blast furnace slag powder having a specific surface area of 4000 cm 2 / g or more.
【０００６】以下に本発明をさらに詳細に説明する。本
発明によれば、Ｃ2Ｓ含有量６０〜９０重量％の高ビー
ライトセメントクリンカから調製したポルトランドセメ
ントに高炉スラグ粉末を混入することにより、初期強度
の改善が可能となり、さらに炭酸カルシウムを主成分と
する粉末、例えば石灰石粉末を混入することにより、大
幅な低発熱性が達成された。さらにまた、従来の三成分
系以上の性能を達成しながら、混合材の混入量を著しく
減少することができたので、コンクリートの耐中性化に
代表される耐久性を改善することもできた。また石灰石
粉末が天然品で豊富に得られることから、安価で経時的
な変質もないので、保存安定性に優れたセメントを得る
ことができる。The present invention will be described in more detail below. According to the present invention, by incorporating blast furnace slag powder into Portland cement prepared from high belite cement clinker having a C 2 S content of 60 to 90% by weight, it is possible to improve the initial strength, and further to improve the calcium carbonate content. By incorporating a powder as a component, for example, limestone powder, a significantly low heat buildup was achieved. Furthermore, while the performance of the conventional three-component system or higher was achieved, the mixing amount of the mixed material could be significantly reduced, so the durability represented by neutralization of concrete could be improved. . Further, since limestone powder is abundantly obtained as a natural product, it is inexpensive and does not deteriorate over time, so that a cement having excellent storage stability can be obtained.
【０００７】本発明の混合セメントにおいては、Ｃ2Ｓ
含有量６０〜９０重量％の高ビーライトセメントクリン
カから調製されたポルトランドセメントが、混合セメン
ト全体量の５５〜９０重量％の主成分として用いられ
る。このようにセメントクリンカ成分が５５重量％以上
と高含有率であるため、とくに耐久性（耐中性化）が改
善される。この場合、ポルトランドセメントが５５重量
％未満であると、セメントクリンカ成分量が少なくな
り、耐久性の改善が見込まれない。本発明の混合セメン
トにおけるポルトランドセメントは、比表面積３５００
cm2／gが好ましい。その理由は、品質の安定性および製
造上のコスト面からである。In the mixed cement of the present invention, C 2 S
Portland cement prepared from high belite cement clinker with a content of 60-90 wt% is used as the main component of 55-90 wt% of the total amount of mixed cement. In this way, the cement clinker component has a high content rate of 55% by weight or more, so that the durability (resistance to neutralization) is particularly improved. In this case, if the content of Portland cement is less than 55% by weight, the amount of cement clinker component will be small, and improvement in durability cannot be expected. Portland cement in the mixed cement of the present invention has a specific surface area of 3500.
cm 2 / g is preferred. The reason is that the quality is stable and the manufacturing cost is high.
【０００８】本発明において、炭酸カルシウムを主成分
とする粉末としては、例えば取り扱いが容易で安価であ
る石灰石粉末が好適に用いられる。以下、石灰石粉末を
例にとり説明する。石灰石粉末は、比表面積が５０００
cm2／g以上あることが必要である。５０００cm2／g未満
であると、強度発現性が劣る。また、本発明の混合セメ
ント中における石灰石粉末の混入量は、５〜３０重量％
である。５重量％未満では、温度低減効果が減少し、ま
た逆に３０重量％を超えると、強度発現性が低下して好
ましくない。In the present invention, as the powder containing calcium carbonate as a main component, for example, limestone powder which is easy to handle and inexpensive is preferably used. Hereinafter, description will be made by taking limestone powder as an example. Limestone powder has a specific surface area of 5000
It should be at least cm 2 / g. When it is less than 5000 cm 2 / g, the strength developability is poor. The amount of limestone powder mixed in the mixed cement of the present invention is 5 to 30% by weight.
Is. If it is less than 5% by weight, the effect of reducing the temperature is reduced, and conversely if it exceeds 30% by weight, the strength development is lowered, which is not preferable.
【０００９】本発明で使用できる高炉スラグ粉末は、と
くに制限されるものではないが、例えば高炉水さい、高
炉さい、転炉さい、電気炉さい、高炉砕石等を粉末化し
たものが挙げられる。高炉スラグ粉末の比表面積は、４
０００cm2／g以上が必要である。４０００cm2／g未満で
あると、強度発現性が劣る。また、本発明の混合セメン
ト中における高炉スラグの混入量は、５〜４０重量％で
ある。５重量％未満では、強度発現の改善効果が低下
し、また逆に４０重量％を超えると、温度低減効果並び
に耐久性が低下して好ましくない。The blast furnace slag powder which can be used in the present invention is not particularly limited, but examples thereof include powdered blast furnace slag, blast furnace sill, converter sill, electric furnace slag, blast furnace crushed stone and the like. The specific surface area of blast furnace slag powder is 4
000 cm 2 / g or more is required. When it is less than 4000 cm 2 / g, strength development is poor. The amount of blast furnace slag mixed in the mixed cement of the present invention is 5 to 40% by weight. If it is less than 5% by weight, the effect of improving the strength development is lowered, while if it exceeds 40% by weight, the temperature reducing effect and the durability are lowered, which is not preferable.
【００１０】[0010]
【作用】ポルトランドセメントは、Ｃ3Ｓ、Ｃ2Ｓ、Ｃ3
Ａ、Ｃ4ＡＦの４種類の水硬性鉱物を主成分とするクリ
ンカーに適当量の石膏を混合し粉砕したものである。ポ
ルトランドセメントが水に接触すると、これら４種の水
硬性鉱物および石膏は水和反応により水和物を生成し、
硬化し、強度を発現するが、その際反応系と生成系の溶
解熱の差に対応した水和熱が発生する。各鉱物の完全水
和時の水和熱を比較すると、Ｃ3Ｓは１２０ｃａｌ／
ｇ、Ｃ3Ａは２０７ｃａｌ／ｇ、Ｃ4ＡＦは１００ｃａｌ
／ｇであるが、Ｃ2Ｓは６２ｃａｌ／ｇと低い。一方そ
れらの強度発現性は、材令９１日以降ではＣ2ＳはＣ3Ｓ
とほぼ同等である。このことから、セメントの水和熱を
低減するためには、Ｃ3ＳおよびＣ3Ａの含有量を低減
し、Ｃ2Ｓの含有量を増大させた高ビーライトセメント
が有効であることがわかる。しかしながら、単にＣ2Ｓ
含有量を多くしたのみでは、上記で述べたように、圧縮
強度が低下し実用に供し難いといった問題点が生じる。
そこで本発明においては、特定の比表面積を有する高炉
スラグ粉末および石灰石粉末を高ビーライトセメントに
添加して従来の問題点を解決することができた。高炉ス
ラグ粉末は、初期材令強度に寄与し、さらに石灰石粉末
は高炉スラグ粉末とともに、Ｃ2Ｓと水和により生じた
Ｃａ（ＯＨ）2との反応後のＣ−Ｓ−Ｈの生成に寄与
し、従って硬化体の初期およびそれ以後の強度増進に寄
与する。すなわち、高炉スラグ粉末、石灰石粉末を混入
した本発明の混合セメントは、初期強度の改善が達成さ
れ、しかも最終的な断熱温度の上昇量も低減される。[Function] Portland cement is C 3 S, C 2 S, C 3
A clinker mainly composed of four types of hydraulic minerals A and C 4 AF was mixed with an appropriate amount of gypsum and crushed. When Portland cement comes into contact with water, these four hydraulic minerals and gypsum form a hydrate through a hydration reaction,
Although it hardens and develops strength, heat of hydration corresponding to the difference in heat of solution between the reaction system and the production system is generated. Comparing the heat of hydration of each mineral during complete hydration, C 3 S is 120 cal /
g, C 3 A is 207 cal / g, C 4 AF is 100 cal
/ G, but C 2 S is as low as 62 cal / g. On the other hand, their strength development is that C 2 S is C 3 S after 91 days of age.
Is almost equivalent to Therefore, in order to reduce the heat of hydration of the cement, it is effective that a high belite cement having a reduced content of C 3 S and C 3 A and an increased content of C 2 S is effective. Recognize. However, simply C 2 S
If only the content is increased, as described above, there is a problem that the compressive strength is lowered and it is difficult to put into practical use.
Therefore, in the present invention, the conventional problems could be solved by adding blast furnace slag powder and limestone powder having a specific surface area to high belite cement. Blast furnace slag powder contributes to the initial material age strength, yet limestone powder with blast furnace slag powder, contributing to the generation of C-S-H after reaction with Ca (OH) 2 produced by C 2 S and hydration Therefore, it contributes to the strength enhancement of the cured product at the initial stage and thereafter. That is, the mixed cement of the present invention mixed with the blast furnace slag powder and the limestone powder achieves the improvement of the initial strength and the final rise in the adiabatic temperature is also reduced.
【００１１】[0011]
【実施例】以下、本発明を実施例により説明する。高ビ
ーライトセメントクリンカ（Ｃ2Ｓ含有量７５重量％、
Ｃ3Ｓ１２重量％、Ｃ3Ａ２重量％、Ｃ4ＡＦ８重量％）
から調製したポルトランドセメント（比表面積３５００
cm2／g）、石灰石粉末（比表面積７０００cm2／g）およ
び高炉スラグ粉末（比表面積６０００cm2／g）を、表１
に示すような混合割合で混合し、各種混合セメントを調
製した。なお、各試料は、その重量に対し、ＳＯ3が２.
５重量％になるように調整された。試料Ｎｏ.１〜８
は、高炉スラグ粉末および石灰石粉末を全く配合してい
ないか、またはその一方だけしか配合していない比較試
料である。また、試料Ｎｏ.２１および２２は、それぞ
れ市販の中庸熱ポルトランドセメント（ビーライト３６
％）および三成分系超低発熱性セメント（ポルトランド
セメント２３重量部に対し、スラグおよびフライアッシ
ュ７７重量部）であり、比較試料である。本発明の混合
セメントは、試料Ｎｏ.９〜２０である。これら２２種
類の混合セメントを用いて調製したコンクリートに対
し、圧縮強度および断熱温度上昇を測定した。その結果
を表１に示す。また、比較試料として、中庸熱ポルトラ
ンドセメント（試料Ｎｏ.２１）および高ビーライトセ
メント（試料Ｎｏ.１）と、本発明の混合セメント（試
料Ｎｏ.１０、１４、２０および２２）における経過時
間（日）に対する断熱温度上昇量の変化を図１に示す
（各曲線に付されている番号は、試料Ｎｏ.に対応して
いる）。コンクリートの配合は、単位セメント量３００
kg／m3、スランプ１２±１.５cm、空気量４±１.０％と
なるように、試行によって単位水量、最適細骨材率を決
定したものを用いた。供試体は、φ１０×２０cmの鋼製
型枠を用い、湿空で２日間養生後、２０℃の水中で所定
の材令まで養生後、強度試験を実施した。また断熱温度
上昇試験は２０℃で混練後のフレッシュコンクリートを
測定容器に投入し、断熱条件を保ち、供試体中心温度を
３０分おきに１４日間ないし２８日間測定することによ
り行った。EXAMPLES The present invention will be described below with reference to examples. High belite cement clinker (C 2 S content 75% by weight,
C 3 S12 wt%, C 3 A2 wt%, C 4 AF8 wt%)
Portland cement prepared from (specific surface area 3500
cm 2 / g), limestone powder (specific surface area 7000 cm 2 / g) and blast furnace slag powder (specific surface area 6000cm 2 / g), Table 1
Various types of mixed cements were prepared by mixing at the mixing ratios shown in. In addition, each sample has SO 3 of 2.
It was adjusted to be 5% by weight. Sample No. 1-8
Is a comparative sample containing no blast furnace slag powder and limestone powder, or only one of them. Sample Nos. 21 and 22 are commercially available medium heat Portland cements (Belite 36).
%) And a ternary super low heat-generating cement (23 parts by weight of Portland cement to 77 parts by weight of slag and fly ash), which are comparative samples. The mixed cements of the present invention are sample Nos. 9 to 20. Compressive strength and adiabatic temperature rise were measured for concrete prepared using these 22 types of mixed cement. The results are shown in Table 1. In addition, as comparative samples, the elapsed time in the medium heat Portland cement (Sample No. 21) and high belite cement (Sample No. 1) and the mixed cement of the present invention (Samples Nos. 10, 14, 20 and 22) ( The change in the adiabatic temperature rise with respect to (day) is shown in FIG. 1 (the numbers attached to the respective curves correspond to the sample numbers). The mixing ratio of concrete is 300 units of cement.
The unit water amount and the optimum fine aggregate ratio were determined by trial so that the kg / m 3 , the slump 12 ± 1.5 cm, and the air amount 4 ± 1.0% were used. As the test piece, a steel mold of φ10 × 20 cm was used, and after curing in wet air for 2 days, it was cured in water at 20 ° C. to a predetermined age, and then a strength test was performed. Further, the adiabatic temperature rise test was carried out by introducing fresh concrete after kneading at 20 ° C. into a measuring container, keeping the adiabatic condition, and measuring the center temperature of the sample every 30 minutes for 14 to 28 days.
【００１２】[0012]
【表１】 [Table 1]
【００１３】表１および図１より、 試料Ｎｏ.２１の市販中庸熱ポルトランドセメント
よりも、本発明の各混合セメントは、断熱上昇温度を約
１０〜１８℃も低減できる； 試料Ｎｏ.１の高ビーライトセメントよりも、本発
明の各混合セメントは、材令３日の初期強度が６〜２９
kgf／cm2、材令７日で１６〜７０kgf／cm2も改善され
る； 試料Ｎｏ.１〜８の高炉スラグ粉末または石灰石粉
末を配合していない混合セメントと比較し、本発明の混
合セメントは、圧縮強度および／または断熱上昇温度が
改善されている；ことが判る。From Table 1 and FIG. 1, each mixed cement of the present invention can reduce the adiabatic rising temperature by about 10 to 18 ° C. as compared with the commercially available moderate heat Portland cement of Sample No. 21; Relative to belite cement, each mixed cement of the present invention has an initial strength of 6 to 29 days 3 days.
kgf / cm 2, 16~70kgf / cm 2 also improved as in wood age 7 days; compared to a blended cement which is not blended with blast furnace slag powder or limestone powder sample Nos. 1-8, mixed cement of the present invention Have improved compressive strength and / or adiabatic rise temperature;
【００１４】[0014]
【発明の効果】本発明により、従来の中庸熱セメントお
よび二成分系セメントよりも著しく優れた低発熱性、す
なわち三成分系セメントと同等もしくはそれ以上の低発
熱性を実現するとともに、初期強度が改善され、しかも
混合材混入量の減少により耐久性（とくに耐中性化）が
向上された高ビーライトセメント系の混合セメントが提
供される。EFFECTS OF THE INVENTION According to the present invention, a low heat build-up, which is remarkably superior to the conventional medium heat cement and the two-component cement, that is, a low heat buildup equivalent to or higher than that of the three-component cement, is realized, and the initial strength is Provided is a high belite cement-based mixed cement which is improved and has improved durability (particularly resistance to neutralization) due to a decrease in the mixing amount of the mixing material.
【図１】比較試料のセメントと本発明の混合セメントに
おける経過時間（日）に対する断熱温度上昇量の変化を
示す図である。FIG. 1 is a diagram showing a change in adiabatic temperature rise amount with respect to elapsed time (days) in a cement as a comparative sample and a mixed cement of the present invention.
Claims (1)
低発熱性ポルトランドセメントクリンカーから調製した
ポルトランドセメント５５〜９０重量％； （ｂ）炭酸カルシウムを主成分とする比表面積が５００
０cm2／g以上の粉末５〜３０重量％；および （ｃ）比表面積が４０００cm2／g以上の高炉スラグ粉末
５〜４０重量％を含有してなる、混合セメント。(A) 55-90% by weight of Portland cement prepared from low heat-generating Portland cement clinker containing 60-90% by weight of C 2 S; (b) a specific surface area containing calcium carbonate as a main component of 500
5 to 30% by weight of powder having a surface area of 0 cm 2 / g or more; and (c) 5 to 40% by weight of blast furnace slag powder having a specific surface area of 4000 cm 2 / g or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07378193A JP3283094B2 (en) | 1993-03-31 | 1993-03-31 | Mixed cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07378193A JP3283094B2 (en) | 1993-03-31 | 1993-03-31 | Mixed cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06287046A true JPH06287046A (en) | 1994-10-11 |
| JP3283094B2 JP3283094B2 (en) | 2002-05-20 |
Family
ID=13528096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07378193A Expired - Lifetime JP3283094B2 (en) | 1993-03-31 | 1993-03-31 | Mixed cement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3283094B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002293586A (en) * | 2001-03-30 | 2002-10-09 | Taiheiyo Cement Corp | Hydraulic composition |
| JP2002321950A (en) * | 2001-04-24 | 2002-11-08 | Taiheiyo Cement Corp | Filler cement composition |
| JP2002321949A (en) * | 2001-04-24 | 2002-11-08 | Taiheiyo Cement Corp | Blast furnace cement composition |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6347051B2 (en) | 1991-11-26 | 2002-02-12 | Hitachi, Ltd. | Storage device employing a flash memory |
| KR970008188B1 (en) | 1993-04-08 | 1997-05-21 | 가부시끼가이샤 히다찌세이사꾸쇼 | Control method of flash memory and information processing apparatus using the same |
| CN109369076B (en) * | 2018-11-21 | 2021-09-07 | 杭州金鼎实业有限公司 | Concrete and preparation method thereof |
-
1993
- 1993-03-31 JP JP07378193A patent/JP3283094B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002293586A (en) * | 2001-03-30 | 2002-10-09 | Taiheiyo Cement Corp | Hydraulic composition |
| JP4520067B2 (en) * | 2001-03-30 | 2010-08-04 | 太平洋セメント株式会社 | Hydraulic composition |
| JP2002321950A (en) * | 2001-04-24 | 2002-11-08 | Taiheiyo Cement Corp | Filler cement composition |
| JP2002321949A (en) * | 2001-04-24 | 2002-11-08 | Taiheiyo Cement Corp | Blast furnace cement composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3283094B2 (en) | 2002-05-20 |
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