JPH0235698B2 - - Google Patents
Info
- Publication number
- JPH0235698B2 JPH0235698B2 JP56084403A JP8440381A JPH0235698B2 JP H0235698 B2 JPH0235698 B2 JP H0235698B2 JP 56084403 A JP56084403 A JP 56084403A JP 8440381 A JP8440381 A JP 8440381A JP H0235698 B2 JPH0235698 B2 JP H0235698B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- ultra
- cao
- strength
- fast hardening
- 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.)
- Expired - Lifetime
Links
- 239000004568 cement Substances 0.000 claims description 94
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 17
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- 235000012241 calcium silicate Nutrition 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 58
- 239000000292 calcium oxide Substances 0.000 description 31
- 235000012255 calcium oxide Nutrition 0.000 description 27
- 230000007423 decrease Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- -1 calcium sulfo aluminate Chemical class 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910001678 gehlenite Inorganic materials 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、超速硬性セメントに関するものであ
る。
近年、高騰する人件費や設備費に対して、工事
日数の短縮化によるコスト低減や緊急工事の必要
性から、早期に高強度を発現するセメントの需要
が日ごとに増しており、早強性への要求は１日強
度を主眼とする従来の超早強セメントから、さら
に時間単位で強度が発現する超速硬性セメントが
開発され市販されている。
例えば、特開昭49−42715号公報に示されてい
る超速硬性セメントは主成分としてカルシウムサ
ルフオアルミネート（3CaO・3Al2O3・CaSO4以
下C3A3Cと称す）、ダイカルシウムシリケート
（2CaO・SiO2以下C2Sと称す）、硫酸カルシウム
（CaSO4以下Ｃと称す）及び遊離CaO（以下、
ｆ・CaOと称す）を含み、その凝結終結時間は数
十分であり、かつ４時間圧縮強度は100Kg／cm2以
上の超速硬性を示すものであつた。しかしこのセ
メントはクリンカ中にｆ・CaOを少量残すように
する必要があるため製造が困難であり、均一な品
質のセメントを得るのがむつかしかつた。
また、ジエツトセメントの商品名で市販されて
いる超速硬性セメントは3CaO・SiO2（以下C3Sと
称す）、11CaO・7Al2O3・CaF2、C2S等を主要鉱
物とするものがあるが、これもまた注水後数十分
で水和硬化し、１〜２時間で強度を発揮するもの
である。
しかし、従来のこれらの超速硬性セメントは、
セメントの凝結時間が極めて短かく、これを用い
たコンクリート工事においては良好な流動性と十
分な作業時間が得られないため、実際に使用する
場合には多量の凝結遅延剤を用いなければなら
ず、そのためセメントの超速硬性が失なわれかつ
硬化体の諸特性が著しく損なわれる傾向にあり、
その使用範囲はごく特殊の用途に限られていた。
そこで、水と混和してから成型するまで十分な
作業時間が任意に取れて、しかも得られる硬化体
が超速硬性を失うことなく短時間で十分な強度が
得られる超速硬性セメントの開発が強く望まれて
いた。
本発明者らは、先に述べたC3A3C、C2S、Ｃ
Ｓ及びｆ・CaOを含んだ超速硬性セメントについ
て研究しこの超速硬性セメントの品質、特に速硬
性のバラツキは、これらセメントに含まれるｆ・
CaOとＣ含有量に要因があることを追究し得
た。その結果に基づいて品質の変動が少ない超早
強性セメント組成物を発明し、これを特願昭56−
38278号で出願した。
これはC3A3C、Ｃ、C2Sを主成分とし、
SO3分がSO3／Al2O3モル比で0.4〜1.7、有効CaO
が有効CaO／Al2O3モル比で0.5〜1.2であり、さ
らにｆ・CaOを実質的に含まないことを特徴とす
るもので、凝結終結時間が３時間以上で１日圧縮
強さが200Kg／cm2を越えるものである。
しかし、この超早強性セメントを用いてコンク
リート製品を得る場合、３〜４時間で充分な脱型
強度を得ることは困難であつた。
また、本出願人は先にｆ・CaOを含むこの種の
セメントにポルトランドセメントを混和してなる
超早硬セメント（特開昭52−90526号公報）につ
いて出願したがこのC3A3C、C2S及びＣを主
成分とする母体セメントがｆ・CaOを含むため前
述した様にそれ自身凝結は早いものでありポルト
ランドセメントを添加しても凝結時間はせいぜい
20〜30分のものが40〜50分に伸びる程度のもので
あり、良好な作業性と十分な作業時間が任意に取
れるまでには至らなかつた。
本発明者らは、注水混練後、凝結遅延剤を用い
ずにあるいは用いたとしてもごく少量で任意の作
業時間が取れ、しかも従来の超速硬性セメントに
見られた凝結遅延剤使用時の早期強度の低下もな
くかつ良好な流動性を具備した超速硬性セメント
を提供するべく研究した結果、上述の「超早強セ
メント組成物」とポルトランドセメントとを含む
セメントは優れた超速硬性と良好な作業性と十分
な作業時間を有するとの知見を得て本発明を完成
するにいたつた。
以上のことに対して理論的考察を加えると下記
の通りになると考えられる。
従来の超速硬性セメントはその中に含まれる
C3A3CとＣ及びｆ・CaOとが下記(1)式に従つ
て水和反応し、カルシウムサルフオアルミネート
水和物（3CaO・Al2O3・3CaSO4・32H2O以下エ
トリンガイドと称す）を生成し、硬化体の強度を
発現するが、ｆ・CaOの放出速度が早いため、こ
れに伴ない凝結時間の短かいものと考えられる。
3CaO・3Al2O3・CaSO4
＋8CaSO4＋6CaO＋96H2O→
３（3CaO・Al2O3・
3CaSO4・32H2O） ……(1)
これに対して本発明の超硬速性セメントはその
中に含まれているポルトランドセメントの主成分
であるC3Sが、近似的に(2)式で示される水和反応
に従つて水和してカルシウムシリケート水和物
（以下Ｃ−Ｓ−Ｈと称す）
3CaO・SiO2＋H2O→Ｃ−Ｓ−Ｈ＋Ca（OH）2
……(2)
とCa（OH）2を折出し、この折出したCa（OH）2と
C3A3CとＣとが(1)式に準じて反応してエトリ
ンガイトを生成し強度を発現するものと思われ
る。
このC3Sからのライム放出速度はｆ・CaOから
のライム放出速度と比べて比較的ゆるやかである
ので、本発明の超速硬性セメントは従来品より十
分な凝結時間が得られ、しかも早期強度発現性も
良好になるものと思われる。
本発明の超速硬性セメントは、19〜70重量％の
C3A3C、35重量％以下のＣ、及び10〜65重量
％のC2Sを主成分とし、SO3分がSO3／Al2O3モル
比で0.4〜1.7、有効CaOが有効CaO／Al2O3モル
比で0.5〜1.2でありさらにｆ・CaOを含有しない
セメント組成物（以下セメントＡと称す）とポル
トランドセメント（以下セメントＢと称す）とを
含み、かつ全体としてカルシウムサルフオアルミ
ネート含有量が18重量％以上であることを特徴と
するものである。
セメントＡにおける有効CaOは、セメントＡ中
のSiO2、Fe2O3、SO3、TiO2等がそれぞれ
2CaO・SiO2、4CaO・Al2O3・Fe2O3、CaSO4、
3CaO・TiO2・CaSO4の形等でCaOと結合するも
のとしてそれぞれの成分が消費するCaOをボーグ
式に準じて計算し、その合量を全CaO量より差引
いたものである。
セメントＡは石灰質原料（石灰石、生石灰等）、
アルミナ質原料（ボーキサイト、粘土、高炉スラ
グ等）、SO3質原料（排脱石こう、リン酸石こう
等）硅石質原料（粘土、硅石、硅砂等）等を用い
て所定の割合に混合粉砕し、1200℃〜1350℃で焼
成し、得られたクリンカをそのまま粉砕するかま
たはこのクリンカから製造されるセメントのSO3
分がSO3／Al2O3モル比で0.4〜1.7になるように調
整し、粉砕される。また上記セメントＢに対し一
般にポルトランドセメントに通常混入されるフラ
イアツシユ、高炉スラグ、シリカ質混和材等を本
願の目的をそこなわない程度に添加混入すること
はさしつかえない。
本発明の超速硬性セメントは、セメントＡクリ
ンカとセメントＢクリンカを慣用の粉砕機（例え
ばボールミル）で混合粉砕するかあるいは粉砕さ
れたセメントＡとセメントＢ（市販品）とを慣用
の混合機等で混和することにより得られる。
セメントＡのクリンカ中にｆ・CaOが残らない
ようにするには有効CaOが有効CaO／Al2O3モル
比で1.2以下になるように配合することが肝要で
ある。
セメントＡ中のC3A3Cは19−70重量％である
ことが必要である。C3A3Cが19重量％未満の場
合セメントＢを含めてなるセメントでは所望の早
期強度は得られない。またC3A3Cが70重量％を
越える場合、セメントＢを含めてなるセメントで
は、所望の早期強度は得られるものの経時変化と
共に膨張性を示し、強度低下を起こし強いては膨
張破壊を生じる。
セメントＡ中のSO3分はSO3／Al2O3モル比で
0.4〜1.7であることが肝要である。0.4未満の場
合、セメントＢを含めてなるセメントでは所望の
早期強度は得られず、また1.7を越える場合セメ
ントＢを含めてなるセメントの供試体は膨張、亀
裂を生じて著しい強度低下を示す。
またセメントＡクリンカ中の残存Ｃが35重量
％越える場合は、SO3／Al2O3モル比が1.7を越え
る場合と同様に供試体に膨張・亀裂を生じて著し
い強度低下を示す。
セメントＡクリンカ中に有効CaO／Al2O3モル
比が1.2を越えるとｆ・CaOが残存する様になり、
これにセメントＢを含めてなるセメントでは所望
の早期強度は得られるが、良好な流動性と十分な
作業時間を得ることは困難となる。
したがつて、セメントＡクリンカ中にはｆ・
CaOを残さないようにすることが必要であり、そ
のためには有効CaO／Al2O3モル比で1.2以下にす
ることが肝要である。
一方、有効CaO／Al2O3モル比が1.2を下回るに
つれて、徐々にゲーレナイト（2CaO・Al2O3・
SiO2以下C2ASと称す）が生成する様になり、こ
のモル比が0.5を下回るとC2AS量は増加し、これ
にセメントＢを含めて得られるセメントの強度は
早期および長期共に低下するので、セメントＡク
リンカ中の有効CaO／Al2O3モル比は0.5〜1.2に
することが肝要である。
本発明の超速硬性セメントはセメントＡとセメ
ントＢとを含むことを特徴とするものであるが、
この場合超速硬性セメント中のC3A3C含有量を
18重量％以上とするのが好ましい。
C3A3Cが18重量％未満の場合、作業時間、所
望の早期強度および十分な長期強度の三要件を同
時に満足することができない。
また、本発明の超速硬性セメントはブレーン比
表面積は約3400cm2／ｇ以上であることが好まし
い。もちろん粉末度を増加することにより早期圧
縮強さを改善し得ることは他のセメントの場合と
同様である。
本発明の超速硬性セメントは前述した様に構成
されているので、優れた超速硬性（４時間圧縮強
さ100Kg／cm2以上、１日圧縮強さ200Kg／cm2以上）
と良好な流動性および十分な作業時間を有し、か
つ充分な長期強度を有している。また、必要に応
じて凝結遅延剤を使用する場合、従来の超速硬性
セメントに比べてその使用量を大巾に減らすこと
ができる。
さらにまた本発明の超速硬性セメントより得ら
れるセメント硬化体は長さ変化率が小さく、か
つ、耐薬品性にすぐれた等諸特性にすぐれてい
る。
次に、本発明を実施例について説明するが、本
発明はこれらによつて限定されるものではない。
また本文中の部及び％は特記しない限りそれぞれ
重量部及び重量％を示す。
実施例１〜10、比較例１〜９
表１に示す組成を有するそれぞれの原料を表２
に示す調合割合で混合、粉砕したそれぞれの原料
組成物を1200℃〜1300℃の温度で焼成し、クリン
カを得た。得られたそれぞれのクリンカの化学分
析値及び主要鉱物組成を表３に示す。
TECHNICAL FIELD The present invention relates to ultra-fast hardening cement. In recent years, in response to soaring labor and equipment costs, the demand for cement that quickly develops high strength is increasing day by day due to the need to reduce costs by shortening construction days and to carry out emergency construction. In response to this demand, in addition to the conventional ultra-quick-hardening cement that focuses on one-day strength, ultra-quick-hardening cement that develops strength in hours has been developed and is now commercially available. For example, the ultra-fast hardening cement disclosed in JP-A No. 49-42715 contains calcium sulfoaluminate (3CaO, 3Al 2 O 3 , CaSO 4 hereinafter referred to as C 3 A 3 C) and dicalcium silicate as its main components. (2CaO・SiO 2 hereinafter referred to as C 2 S), calcium sulfate (CaSO 4 hereinafter referred to as C) and free CaO (hereinafter referred to as
The final setting time was several tens of minutes, and the 4-hour compressive strength was 100 Kg/cm 2 or more, indicating ultra-rapid hardening. However, this cement is difficult to manufacture because it is necessary to leave a small amount of f.CaO in the clinker, making it difficult to obtain cement of uniform quality. In addition, ultra-fast hardening cements sold under the trade name of Jet Cement have 3CaO・SiO 2 (hereinafter referred to as C 3 S), 11CaO・7Al 2 O 3・CaF 2 , C 2 S, etc. as their main minerals. However, this also hydrates and hardens within several tens of minutes after pouring water, and exhibits strength within 1 to 2 hours. However, these conventional ultra-fast hardening cements
The setting time of cement is extremely short, and good fluidity and sufficient working time cannot be obtained in concrete construction using cement, so a large amount of setting retarder must be used when actually using it. As a result, the cement loses its ultra-fast hardening properties and the properties of the hardened product tend to be significantly impaired.
Its use was limited to very specific applications. Therefore, it is strongly desired to develop an ultra-fast-setting cement that can be used for a sufficient amount of time from mixing with water to molding, and in which the resulting hardened product can obtain sufficient strength in a short period of time without losing its ultra-fast hardening properties. It was rare. The present inventors discovered the above-mentioned C 3 A 3 C, C 2 S, C
Research has been conducted on ultra-fast hardening cements containing S and f-CaO.
We were able to investigate that the cause was the CaO and C content. Based on the results, he invented an ultra-early strength cement composition with little variation in quality, and applied for this in a patent application filed in 1983.
The application was filed under No. 38278. It has C 3 A 3 C, C, and C 2 S as its main components,
SO 3 min is SO 3 /Al 2 O 3 molar ratio 0.4-1.7, effective CaO
is characterized by an effective CaO/Al 2 O 3 molar ratio of 0.5 to 1.2, and substantially no f・CaO, a condensation completion time of 3 hours or more, and a daily compressive strength of 200 kg. / cm2 . However, when obtaining concrete products using this ultra-early strength cement, it has been difficult to obtain sufficient demolding strength within 3 to 4 hours. In addition, the present applicant previously filed an application for ultra-fast hardening cement (Japanese Patent Application Laid-open No. 1983-90526), which is made by mixing Portland cement with this type of cement containing f.CaO, but this C 3 A 3 C, Since the base cement, which is mainly composed of C 2 S and C, contains f・CaO, as mentioned above, it sets quickly by itself, and even if Portland cement is added, the setting time is short at most.
The 20 to 30 minutes were only extended to 40 to 50 minutes, and it was not possible to obtain good workability and sufficient working time at will. The present inventors have discovered that after water injection and kneading, it is possible to take any working time without using a setting retarder, or even if it is used in a very small amount, and to achieve early strength when using a setting retarder, which was found in conventional ultra-fast hardening cement. As a result of research to provide an ultra-fast hardening cement that has good fluidity and no decrease in hardening, it was found that a cement containing the above-mentioned "ultra-early strength cement composition" and Portland cement has excellent ultra-fast hardening properties and good workability. The present invention was completed based on the knowledge that there is sufficient work time. If we add theoretical considerations to the above, we can conclude the following. Conventional ultra-fast hardening cement is included in this category.
C 3 A 3 C, C and f・CaO undergo a hydration reaction according to the following formula (1), and calcium sulfo aluminate hydrate (3CaO・Al 2 O 3・3CaSO 4・32H 2 O and below) is formed. This is thought to be due to the fact that the curing time is short due to the rapid release rate of f.CaO. 3CaO・3Al 2 O 3・CaSO 4 +8CaSO 4 +6CaO+96H 2 O → 3 (3CaO・Al 2 O 3・ 3CaSO 4・32H 2 O) ...(1) On the other hand, the superhard fast cement of the present invention C 3 S, which is the main component of Portland cement, is hydrated to form calcium silicate hydrate (hereinafter referred to as C-S-H ) 3CaO・SiO 2 +H 2 O→C-S-H+Ca(OH) 2
...(2) and Ca(OH) 2 are precipitated, and this precipitated Ca(OH) 2 and
It is thought that C 3 A 3 C and C react according to formula (1) to produce ettringite and develop strength. Since the lime release rate from C 3 S is relatively slow compared to the lime release rate from f-CaO, the ultra-fast hardening cement of the present invention has a more sufficient setting time than conventional products, and also exhibits early strength. It is thought that the properties will also improve. The ultra-fast hardening cement of the present invention contains 19 to 70% by weight of
The main components are C 3 A 3 C, 35% by weight or less of C, and 10-65% by weight of C 2 S, SO 3 min is SO 3 / Al 2 O 3 molar ratio 0.4-1.7, effective CaO is effective A cement composition having a CaO/Al 2 O 3 molar ratio of 0.5 to 1.2 and containing no f-CaO (hereinafter referred to as cement A) and Portland cement (hereinafter referred to as cement B), and containing calcium salt as a whole. It is characterized by a fluoraluminate content of 18% by weight or more. Effective CaO in cement A is determined by SiO 2 , Fe 2 O 3 , SO 3 , TiO 2 , etc. in cement A, respectively.
2CaO・SiO 2 , 4CaO・Al 2 O 3・Fe 2 O 3 , CaSO 4 ,
The amount of CaO consumed by each component is calculated according to the Borg formula, assuming that it combines with CaO in the form of 3CaO, TiO 2 , CaSO 4, etc., and the total amount is subtracted from the total amount of CaO. Cement A is calcareous raw material (limestone, quicklime, etc.),
Alumina raw materials (bauxite, clay, blast furnace slag, etc.), SO3 raw materials (exhausted gypsum, phosphate gypsum, etc.), siliceous raw materials (clay, silica stone, silica sand, etc.) are mixed and pulverized in a predetermined ratio, Calcinate at 1200℃~1350℃ and crush the resulting clinker as it is, or use SO 3 of cement produced from this clinker.
The mixture is adjusted so that the SO 3 /Al 2 O 3 molar ratio is 0.4 to 1.7 and pulverized. Furthermore, fly ash, blast furnace slag, siliceous admixtures, etc., which are generally mixed into Portland cement, may be added to the above cement B to the extent that the purpose of the present application is not impaired. The ultra-fast hardening cement of the present invention can be produced by mixing and pulverizing cement A clinker and cement B clinker in a conventional pulverizer (for example, a ball mill), or by mixing and pulverizing cement A and cement B (commercially available products) in a conventional mixer. Obtained by mixing. In order to prevent f.CaO from remaining in the clinker of cement A, it is important to mix the effective CaO so that the effective CaO/Al 2 O 3 molar ratio is 1.2 or less. C 3 A 3 C in cement A should be 19-70% by weight. When C 3 A 3 C is less than 19% by weight, the desired early strength cannot be obtained with the cement including cement B. Further, when C 3 A 3 C exceeds 70% by weight, a cement containing cement B can obtain the desired early strength, but exhibits expansivity over time, resulting in a decrease in strength and eventually causing expansion failure. SO 3 in cement A is SO 3 /Al 2 O 3 molar ratio
It is important that it is between 0.4 and 1.7. If it is less than 0.4, the desired early strength cannot be obtained in the cement containing cement B, and if it exceeds 1.7, the cement specimen containing cement B will expand and crack, resulting in a significant decrease in strength. Furthermore, when the residual C in the cement A clinker exceeds 35% by weight, the specimen expands and cracks, resulting in a significant decrease in strength, similar to when the SO 3 /Al 2 O 3 molar ratio exceeds 1.7. When the effective CaO/Al 2 O 3 molar ratio exceeds 1.2 in cement A clinker, f・CaO will remain,
Although the desired early strength can be obtained with a cement containing Cement B, it is difficult to obtain good fluidity and sufficient working time. Therefore, f・
It is necessary to prevent CaO from remaining, and for this purpose it is important to keep the effective CaO/Al 2 O 3 molar ratio to 1.2 or less. On the other hand, as the effective CaO/Al 2 O 3 molar ratio falls below 1.2, gehlenite (2CaO・Al 2 O 3・
When this molar ratio falls below 0.5, the amount of C 2 AS increases, and the strength of the cement obtained by including cement B decreases both in the early and long term. Therefore, it is important that the effective CaO/Al 2 O 3 molar ratio in the cement A clinker is 0.5 to 1.2. The ultra-fast hardening cement of the present invention is characterized by containing cement A and cement B,
In this case, the C 3 A 3 C content in ultra-fast hardening cement is
The content is preferably 18% by weight or more. When C 3 A 3 C is less than 18% by weight, the three requirements of working time, desired early strength and sufficient long-term strength cannot be satisfied at the same time. Further, it is preferable that the ultra-fast hardening cement of the present invention has a Blaine specific surface area of about 3400 cm 2 /g or more. Of course, as with other cements, the early compressive strength can be improved by increasing the fineness. Since the ultra-fast hardening cement of the present invention is configured as described above, it has excellent ultra-fast hardening properties (4-hour compressive strength of 100 Kg/cm 2 or more, 1-day compressive strength of 200 Kg/cm 2 or more).
It has good flowability, sufficient working time, and sufficient long-term strength. Furthermore, if a setting retarder is used as necessary, the amount used can be greatly reduced compared to conventional ultra-fast hardening cement. Furthermore, the hardened cement body obtained from the ultra-fast hardening cement of the present invention has a small rate of change in length and has excellent properties such as excellent chemical resistance. Next, the present invention will be described with reference to Examples, but the present invention is not limited thereto.
In addition, parts and percentages in the text indicate parts by weight and percentages by weight, respectively, unless otherwise specified. Examples 1 to 10, Comparative Examples 1 to 9 Table 2 shows each raw material having the composition shown in Table 1.
Each of the raw material compositions mixed and pulverized at the mixing ratio shown in the figure was fired at a temperature of 1200°C to 1300°C to obtain clinker. Table 3 shows the chemical analysis values and main mineral composition of each clinker obtained.
【表】【table】
【表】【table】
【表】
表３に示すクリンカ７種類をそれぞれボールミ
ルにて粉砕し、ブレーン比表面積が4400〜4700
cm2／ｇのセメントＡを得た。
このセメントＡ単独またはこのセメントＡに表
４に示す市販の普通ポルトランドセメント（商品
名：アサノ普通セメント）（セメントＢ）を表５
に示す通りに配合して得られたそれぞれのセメン
トについて、JIS Ｒ 5201に準じて物理試験を行
なつた。その結果を表５に示す。[Table] The seven types of clinker shown in Table 3 were each ground in a ball mill, and the Blaine specific surface area was 4400 to 4700.
Cement A of cm 2 /g was obtained. This cement A alone or the commercially available ordinary Portland cement shown in Table 4 (trade name: Asano Ordinary Cement) (cement B) shown in Table 5 is added to this cement A.
A physical test was conducted in accordance with JIS R 5201 for each of the cements obtained by blending as shown. The results are shown in Table 5.
【表】【table】
【表】
以上の結果より、セメントＡ単味の場合〔比較
例２、４、６〕、１日圧縮強さ、28日圧縮強さに
おいては十分な強度を有するものの早期強度（４
時間圧縮強さ）では82〜88Kg／cm2程度であるが、
セメントＡにセメントＢを含めてなる本発明の超
速硬性セメント〔実施例１〜10〕の場合は、４時
間圧縮強さで154〜245Kg／cm2と良好なる超速硬性
を示した。
また、従来のこの種のｆ・CaOを含有した超速
硬性セメント〔比較例９〕の凝結終結時間が約50
分と非常に短いものであつたが、本発明の超速硬
性セメントの場合は１時間30分〜２時間30分と長
く、十分な作業時間を有するものであつた。
セメントＡにセメントＢを含めてなるセメント
のC3A3C含有量が18％を下回る〔比較例１、
３、５〕と作業時間、長期強度（28日）、および
早期速度（４時間）の点において要望される条件
を同時に満足することができなかつた。
一方、セメントＡにセメントＢを含めてなるセ
メントのC3A3C含有量が70％近くなると所期の
早期速度は得られるが、長期速度が大巾に低下す
るので好ましくなかつた。
例えば〔比較例７、８〕の様にセメントＡ中の
C3A3C含有量が73％と多い場合、十分な早期速
度を発現するが長期において著しい強度低下を起
こすことが示された。
すなわち、本発明の超速硬性セメントはセメン
トＡ中のC3A3C含有量は19〜70％であることが
必要であることが認められた。
以上のことから、この種のセメントでｆ・CaO
を含有するタイプの超速硬性セメントの凝結時間
は非常に短かいものであるが、ｆ・CaOを含まな
いセメントＡにセメントＢを含めてなる本発明の
超速硬性セメントは、十分な作業時間と十分な早
期強度を有する画期的な超速硬性セメントである
ということが認められた。[Table] From the above results, the case of single cement A [Comparative Examples 2, 4, 6] has sufficient strength in 1-day compressive strength and 28-day compressive strength, but early strength (4
The compressive strength (time compressive strength) is about 82 to 88 Kg/ cm2 , but
The ultra-rapid hardening cements of the present invention (Examples 1 to 10) comprising cement A and cement B exhibited excellent ultra-rapid hardening with a 4-hour compressive strength of 154 to 245 kg/cm 2 . In addition, the setting completion time of the conventional ultra-fast hardening cement containing this type of f-CaO [Comparative Example 9] was approximately 50
However, the ultra-fast hardening cement of the present invention had a long working time of 1 hour and 30 minutes to 2 hours and 30 minutes, which was a sufficient working time. The C 3 A 3 C content of the cement consisting of cement A and cement B is less than 18% [Comparative Example 1,
3, 5], it was not possible to simultaneously satisfy the required conditions in terms of working time, long-term strength (28 days), and early speed (4 hours). On the other hand, if the C 3 A 3 C content of the cement made by including cement A and cement B approaches 70%, the desired early speed can be obtained, but the long-term speed decreases significantly, which is not preferable. For example, in [Comparative Examples 7 and 8],
It was shown that when the C 3 A 3 C content is as high as 73%, sufficient early velocity is developed, but a significant decrease in strength occurs over a long period of time. That is, it was recognized that the C 3 A 3 C content in cement A of the ultra-rapid hardening cement of the present invention needs to be 19 to 70%. From the above, it can be concluded that with this type of cement, f・CaO
The setting time of ultra-fast hardening cement of the type that contains It was recognized that this is an innovative ultra-fast hardening cement with excellent early strength.
Claims (1)
ート、35重量％以下の硫酸カルシウム及び10〜65
重量％のダイカルシウムシリケートを主成分と
し、SO3分がSO3／Al2O3モル比で0.4〜1.7、有効
CaOが有効CaO／Al2O3モル比で0.5〜1.2であり
かつ遊離CaOを含有しないセメント組成物とポル
トランドセメントを含み、かつ全体としてカルシ
ウムサルフオアルミネートの含有量が18重量％以
上であることを特徴とする超速硬性セメント。1 19-70% by weight of calcium sulfoaluminate, up to 35% by weight of calcium sulfate and 10-65
wt% dicalcium silicate as the main component, SO3min is SO3 / Al2O3 molar ratio 0.4~1.7, effective
A cement composition containing CaO in an effective CaO/Al 2 O 3 molar ratio of 0.5 to 1.2 and containing no free CaO and Portland cement, and the total content of calcium sulfoaluminate is 18% by weight or more. An ultra-fast hardening cement characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56084403A JPS57200252A (en) | 1981-06-03 | 1981-06-03 | Super rapid setting cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56084403A JPS57200252A (en) | 1981-06-03 | 1981-06-03 | Super rapid setting cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57200252A JPS57200252A (en) | 1982-12-08 |
| JPH0235698B2 true JPH0235698B2 (en) | 1990-08-13 |
Family
ID=13829614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56084403A Granted JPS57200252A (en) | 1981-06-03 | 1981-06-03 | Super rapid setting cement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57200252A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0715756Y2 (en) * | 1988-08-26 | 1995-04-12 | 積水化学工業株式会社 | Cutting device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2736047B1 (en) * | 1995-06-29 | 1997-11-28 | Groupe Origny | HYDRAULIC BINDER FOR TREATING CLAY SOILS OR MATERIALS |
| FR2831161B1 (en) | 2001-10-24 | 2004-09-10 | Francais Ciments | IRONLESS AND FREE LIMELESS SULFOALUMINOUS CLINKER, PREPARATION METHOD THEREOF AND USE IN WHITE BINDERS |
| JP6590743B2 (en) * | 2016-03-17 | 2019-10-16 | 太平洋セメント株式会社 | Irwin hydraulic composition and method for producing the same |
-
1981
- 1981-06-03 JP JP56084403A patent/JPS57200252A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0715756Y2 (en) * | 1988-08-26 | 1995-04-12 | 積水化学工業株式会社 | Cutting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57200252A (en) | 1982-12-08 |
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