JP7341089B2 - B-lite clinker and its manufacturing method - Google Patents
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Description
本発明は、強度発現性に優れたビーライトクリンカと、その製造方法に関する。 The present invention relates to a belite clinker with excellent strength development properties and a method for producing the same.
現在、ポルトランドセメントの製造では、早強ポルトランドセメント、普通ポルトランドセメント、中庸熱ポルトランドセメント、および低熱ポルトランドセメントが別々に造られている。これでは、これらのセメントを需要に応じて製造するには頻繁に調合の切り替えを行う煩雑さがあり、また、品質の異なるセメントの切り替え時には多くの不良品が生じる。端成分のクリンカを製造し、それらを調合して、前記セメントと同じ強度発現性を有するセメントが製造できれば、少ない品種でセメントクリンカの製造工程が簡略できるほか、前記ポルトランドセメント以外のセメントでも、要求される強度発現性に応じて製造できると期待される。また、端成分の候補となるビーライトクリンカ自体の強度発現性を高め、汎用的なコンクリートの原料として用いることができれば、他のクリンカ鉱物と比べ製造時の消費エネルギーや二酸化端炭素の排出量を削減できる。しかし、ビーライトクリンカは易焼成性が低く、また強度発現性を高めることは困難であった。 Currently, in the production of Portland cement, early strength Portland cement, normal Portland cement, medium heat Portland cement, and low heat Portland cement are made separately. In this case, in order to manufacture these cements according to demand, it is complicated to frequently change the formulation, and when changing cements of different quality, many defective products are produced. If it were possible to manufacture clinker as an end component and mix them to produce a cement that has the same strength development properties as the above-mentioned cement, it would be possible to simplify the manufacturing process of cement clinker by using fewer types of cement, and even cements other than the above-mentioned Portland cement would be able to meet the requirements. It is expected that it can be manufactured according to the desired strength development properties. In addition, if the strength development of BELITE clinker itself, which is a candidate for an end component, can be improved and used as a raw material for general-purpose concrete, energy consumption and carbon dioxide emissions during production can be reduced compared to other clinker minerals. It can be reduced. However, B-lite clinker has low sinterability, and it has been difficult to improve its strength development.
そこで、特許文献１では、フリーライム等が特定量であるセメントクリンカと、特定量の半水石膏を含む石膏を特定量含有することにより、良好な短期材齢の強度発現性を有しつつ、凝結時間を短縮できる高ビーライト系セメント組成物が提案されている。 Therefore, in Patent Document 1, by containing a specific amount of cement clinker containing a specific amount of free lime etc. and a specific amount of gypsum containing a specific amount of gypsum hemihydrate, while having good short-term strength development, High-belite cement compositions have been proposed that can reduce setting time.
本発明は、前記特許文献１に記載の発明とは異なり、ビーライトクリンカ自体が強度発現性に優れ、ポルトランドセメントの基材として該クリンカを用いたセメントの材齢２８日の強度が高いビーライトクリンカと、その製造方法を提供することを目的とずる。 The present invention differs from the invention described in Patent Document 1, in that BELITE clinker itself has excellent strength development properties, and BELITE has high strength at 28 days of age in cement using the clinker as a base material for Portland cement. The purpose of the present invention is to provide clinker and a method for producing the same.
本発明者は、前記目的にかなうビーライトクリンカを検討したところ、Ｐ２Ｏ５、ＳＯ３、Ｋ２Ｏ、およびＣａＯの含有率が特定の範囲にあるビーライトを含むクリンカは、前記目的を達成できることを見い出し、本発明を完成させた。すなわち、本発明は以下の構成を有するビーライトクリンカ等である。 The present inventor investigated a BELITE clinker that met the above purpose, and found that a clinker containing BELITE with a content of P 2 O 5 , SO 3 , K 2 O, and CaO within a specific range met the above purpose. We have discovered what can be achieved and completed the present invention. That is, the present invention is a be-lite clinker etc. having the following configuration.
［１］ポルトランドセメントクリンカ中のビーライト（鉱物、Ｃ２Ｓ）の含有率が８０質量％以上であって、該ビーライト中のＰ２Ｏ５の含有率が０．８～１．３質量％、ＳＯ３の含有率が０．８～２．０質量％、Ｋ２Ｏの含有率が０．１～０．６質量％、およびＣａＯの含有率が６３～６４質量％である、ビーライトクリンカ。
［２］前記ビーライト中のＣａ／Ｓｉモル比が２．０５～２．３である、前記［１］に記載のビーライトクリンカ。
［３］水硬率（ＨＭ）が１．８～２．０、けい酸率（ＳＭ）が２０～３０、および鉄率（ＩＭ）が０．５～０．８であって、Ｐ２Ｏ５の含有率が１．０～１．５質量％、ＳＯ３の含有率が４～９質量％、およびＫ２Ｏの含有率が０．８～１．５質量％である原料を、１２５０～１５００℃で焼成して前記［１］または［２］に記載のビーライトクリンカを製造する、ビーライトクリンカの製造方法。
[1] The content of belite (mineral, C 2 S) in the Portland cement clinker is 80% by mass or more, and the content of P 2 O 5 in the belite is 0.8 to 1.3% by mass %, the content of SO 3 is 0.8-2.0% by mass, the content of K 2 O is 0.1-0.6% by mass, and the content of CaO is 63-64% by mass. light clinker.
[2] The BELITE clinker according to the above [1], wherein the Ca/Si molar ratio in the BELITE is 2.05 to 2.3.
[3] Hydraulic modulus (HM) is 1.8 to 2.0, silicic acid ratio (SM) is 20 to 30, and iron ratio (IM) is 0.5 to 0.8, and P 2 O A raw material having a content of 1.0 to 1.5% by mass of 5 , a content of SO 3 of 4 to 9% by mass, and a content of K 2 O of 0.8 to 1.5% by mass was A method for producing BELITE clinker, comprising producing the BELITE clinker according to [1] or [2] above by firing at a temperature of ~1500°C.
本発明のビーライトクリンカは、強度発現性に優れ、ポルトランドセメントの基材として用いたセメントの材齢２８日の強度が高い。また、本発明のビーライトクリンカの製造方法は、消費エネルギーが少ない。 The belite clinker of the present invention has excellent strength development properties, and has high strength after 28 days of cement used as a base material for Portland cement. Furthermore, the method for producing belite clinker of the present invention consumes less energy.
以下、本発明のビーライトクリンカとその製造方法について詳細に説明する。
１．ビーライトクリンカ
本発明のビーライトクリンカは、ポルトランドセメントクリンカであって、ビーライトの含有率が８０質量％以上であり、また、該ビーライト中のＰ２Ｏ５の含有率が０．８～１．３質量％、ＳＯ３の含有率が０．８～２．０質量％、Ｋ２Ｏの含有率が０．１～０．６質量％、およびＣａＯの含有率が６３～６４質量％である。クリンカ中のビーライトの含有率が８０質量％未満では、材齢２８日の強度発現性が充分ではなく、また、Ｐ２Ｏ５、ＳＯ３、Ｋ２Ｏ、およびＣａＯの含有率が前記範囲を外れると、後掲の表４の比較例に示すように、材齢２８日の圧縮強さは低くなる。なお、前記ビーライトの含有率は、好ましくは８５質量％以上である。また、前記ビーライトクリンカ中のビーライトの含有率は、易焼成性の観点から、好ましく９５質量％以下、より好ましくは９０質量％以下である。
ビーライトクリンカ中のビーライト（Ｃ２Ｓ）の含有率は、蛍光Ｘ線分析を用いてビーライトクリンカの化学組成を求め、該化学組成に基づき下記（１）式および（２）式のボーグ式を用いて算出する。
Ｃ２Ｓ（質量％）＝２．８７×ＳｉＯ２（質量％）－０.７５４×Ｃ３Ｓ（質量％） ・・・（１）
Ｃ３Ｓ＝４．０７×ＣａＯ－７．６×ＳｉＯ２－６．７２×Ａｌ２Ｏ３－１．４３×Ｆｅ２Ｏ３－２．８５×ＳＯ３ ・・・（２）
ただし、（１）式および（２）式中の化学式は、ビーライトクリンカ中の各化学式が表す化合物の含有率を表す。
前記ビーライト中のＰ２Ｏ５の含有率は、高強度の観点から、０．８～１．３質量％、好ましくは０．９～１．２質量％、より好ましくは０．９５～１．１５質量％である。前記ビーライト中のＳＯ３の含有率は、高強度の観点から、０．８～２．０質量％、好ましくは０．９～１．８質量％、より好ましくは１．０～１．２質量％である。前記ビーライト中のＫ２Ｏの含有率は、高強度の観点から、０．１～０．６質量％、好ましくは０．１２～０．５質量％、より好ましくは０．１５～０．４質量％である。また、前記ビーライト中のＣａＯの含有率は、高強度の観点から、６３～６４質量％、好ましくは６３．２～６３．９質量％、より好ましくは６３．４～６３．８質量％である。
前記ビーライト中のＣａ／Ｓｉモル比は、高強度の観点から、好ましくは２．０５～２．３、より好ましくは２．１～２．２５、さらに好ましくは２．１５～２．２である。
前記ビーライトの化学組成の測定装置は、鉱物粒子ごとに微小領域の化学組成を測定できる装置であればよく、例えば、波長分散型Ｘ線分光器（ＷＤＳ）、エネルギー分散型Ｘ線分光器（ＥＤＳ）等が挙げられる。好ましくは５個以上の異なるクリンカ粒子中のビーライト、より好ましくは１０個以上の異なるクリンカ粒子中のビーライトを測定する。
また、ビーライトの化学組成はビーライト粒子ごとに異なる場合や、ビーライト粒子の中心部から周辺部にかけて異なる場合がある。そこで、好ましくは５個以上のビーライト粒子、より好ましくは１０個以上のビーライト粒子を、ビーライトの１粒子につき好ましくは５点以上、より好ましくは１０点以上の化学組成を測定し、これらの平均値を算出する。
Hereinafter, the belite clinker of the present invention and its manufacturing method will be explained in detail.
1. Belite Clinker The Belite clinker of the present invention is a Portland cement clinker, and has a Belite content of 80% by mass or more, and a P 2 O 5 content of 0.8 to 0.8%. 1.3% by mass, SO 3 content 0.8-2.0% by mass, K 2 O content 0.1-0.6% by mass, and CaO content 63-64% by mass. It is. If the content of belite in the clinker is less than 80% by mass, the strength development property at 28 days of age will not be sufficient, and the content of P 2 O 5 , SO 3 , K 2 O, and CaO will not be within the above range. As shown in the comparative example in Table 4 below, the compressive strength at 28 days of age becomes low. Note that the content of the belite is preferably 85% by mass or more. Further, the content of belite in the belite clinker is preferably 95% by mass or less, more preferably 90% by mass or less from the viewpoint of easy firing.
The content of BELITE (C 2 S) in BELITE clinker is determined by determining the chemical composition of BELITE clinker using fluorescent X-ray analysis, and based on the chemical composition, the content rate of BELITE (C 2 S) is determined by the following formula (1) and (2). Calculate using the formula.
C 2 S (mass %) = 2.87 x SiO 2 (mass %) - 0.754 x C 3 S (mass %) ... (1)
C3S =4.07×CaO - 7.6× SiO2-6.72 × Al2O3-1.43 × Fe2O3-2.85 × SO3 ...( 2 )
However, the chemical formulas in formulas (1) and (2) represent the content of the compound represented by each chemical formula in BELITE clinker.
From the viewpoint of high strength, the content of P 2 O 5 in the BELITE is 0.8 to 1.3% by mass, preferably 0.9 to 1.2% by mass, more preferably 0.95 to 1% by mass. .15% by mass. From the viewpoint of high strength, the content of SO 3 in the BELITE is 0.8 to 2.0% by mass, preferably 0.9 to 1.8% by mass, more preferably 1.0 to 1.2% by mass. Mass%. From the viewpoint of high strength, the content of K 2 O in the BELITE is 0.1 to 0.6% by mass, preferably 0.12 to 0.5% by mass, more preferably 0.15 to 0.5% by mass. It is 4% by mass. Further, from the viewpoint of high strength, the content of CaO in the BELITE is 63 to 64% by mass, preferably 63.2 to 63.9% by mass, more preferably 63.4 to 63.8% by mass. be.
From the viewpoint of high strength, the Ca/Si molar ratio in the belite is preferably 2.05 to 2.3, more preferably 2.1 to 2.25, and even more preferably 2.15 to 2.2. be.
The device for measuring the chemical composition of BELITE may be any device that can measure the chemical composition of a minute region of each mineral particle, such as a wavelength dispersive X-ray spectrometer (WDS), an energy dispersive X-ray spectrometer ( EDS), etc. Preferably the belite in 5 or more different clinker particles is measured, more preferably the belite in 10 or more different clinker particles.
In addition, the chemical composition of BELITE may differ for each BELITE particle, or may vary from the center to the periphery of the BELITE particle. Therefore, the chemical composition of preferably 5 or more Belite particles, more preferably 10 or more Belite particles is measured, preferably 5 or more points, more preferably 10 points or more per particle of Belite. Calculate the average value.
２．ビーライトクリンカの製造方法
本発明のビーライトクリンカの製造方法は、水硬率が１．８～２．０、けい酸率が２０～３０、および鉄率が０．５～０．８であって、Ｐ２Ｏ５の含有率が１．０～１．５質量％、ＳＯ３の含有率が４～９質量％、およびＫ２Ｏの含有率が０．８～１．５質量％である原料を、１２５０～１５００℃で焼成して前記ビーライトクリンカを製造する方法である。
原料の水硬率、けい酸率、および鉄率、並びに、原料中のＰ２Ｏ５、ＳＯ３、およびＫ２Ｏの含有率が前記範囲を外れると、後掲の表４の比較例に示すように、材齢２８日の圧縮強さは低くなる。また、原料中のＰ２Ｏ５、ＳＯ３、およびＫ２Ｏの前記含有率の他に、好ましくは、原料中のＳｉＯ２の含有率は２５～３３質量％、ＣａＯの含有率は５７～６４質量％、ＭｇＯの含有率は０．５～１．０質量％である。
また、焼成温度は１２５０～１５００℃である。焼成温度が１２５０℃未満では、ビーライトクリンカの強度発現性が小さくなり、１５００℃を超えると原料が溶融するおそれがある。なお、焼成温度は、好ましくは１３００～１４５０℃である。なお、焼成炉は、トンネル炉、ロータリーキルン、および流動床炉等の加熱炉が挙げられる。
2. Method for producing BELITE clinker The method for producing BELITE clinker of the present invention has a hydraulic ratio of 1.8 to 2.0, a silicic acid ratio of 20 to 30, and an iron ratio of 0.5 to 0.8. The content of P 2 O 5 is 1.0 to 1.5% by mass, the content of SO 3 is 4 to 9% by mass, and the content of K 2 O is 0.8 to 1.5% by mass. This is a method for producing the BELITE clinker by firing a certain raw material at 1250 to 1500°C.
If the hydraulic ratio, silicic acid ratio, and iron ratio of the raw material, as well as the content of P 2 O 5 , SO 3 , and K 2 O in the raw material, are out of the above ranges, the comparative example shown in Table 4 below As shown, the compressive strength becomes low when the material is 28 days old. In addition to the above-mentioned contents of P 2 O 5 , SO 3 , and K 2 O in the raw material, preferably the content of SiO 2 in the raw material is 25 to 33% by mass, and the content of CaO is 57 to 33% by mass. 64% by mass, and the content of MgO is 0.5 to 1.0% by mass.
Further, the firing temperature is 1250 to 1500°C. If the firing temperature is less than 1250°C, the strength development of BELITE clinker will be reduced, and if it exceeds 1500°C, there is a risk that the raw material will melt. Note that the firing temperature is preferably 1300 to 1450°C. Note that examples of the firing furnace include heating furnaces such as a tunnel furnace, a rotary kiln, and a fluidized bed furnace.
本発明のビーライトクリンカの製造方法では、下記（３）式を用いれば、ビーライトクリンカをポルトランドセメントの基材として用いたセメント組成物の材齢２８日の圧縮強さが、後掲の表４に示すように、精度よく予測できる。
セメント組成物の材齢２８日の圧縮強さの予測値（Ｎ／ｍｍ２）＝１７４．２１４×Ｐ２Ｏ５（質量％）＋７．２８９×ＳＯ３（質量％）－１７．０１０×Ｋ２Ｏ（質量％）－２．０７×ＣａＯ（質量％） ・・・（３）
ただし、（３）式中の化学式は、ビーライトクリンカ中のビーライトの各化学式が表す成分の含有率を表す。なお、前記セメント組成物は、普通ポルトランドセメントの５０質量％（半分の量）をビーライトクリンカで置換したセメント組成物である。
In the method for producing BELITE clinker of the present invention, by using the following equation (3), the compressive strength at 28 days of age of a cement composition using BELITE clinker as a base material for Portland cement can be calculated as shown in the table below. As shown in Figure 4, predictions can be made with high accuracy.
Predicted value of compressive strength of cement composition at 28 days of age (N/mm 2 )=174.214×P 2 O 5 (mass%) + 7.289×SO 3 (mass%) −17.010×K 2 O (mass%) - 2.07×CaO (mass%) ... (3)
However, the chemical formula in formula (3) represents the content rate of the component represented by each chemical formula of BELITE in the BELITE clinker. The cement composition is a cement composition in which 50% by mass (half the amount) of ordinary Portland cement is replaced with Belite clinker.
また、セメント組成物の圧縮強さの目標値（Ｔ２８）、前記（３）式を用いて算出したセメント組成物の圧縮強さの予測値（Ｐ２８）、および、本発明のビーライトクリンカを用いて置換する対象となるポルトランドセメントの圧縮強さの実測値（Ｃ）を下記（４）式に代入すれば、目標とする強度を発現するセメント組成物中に必要なビーライトクリンカの含有率（置換率、Ｂ）を算出できる。これらにより、セメント組成物の圧縮強さを精度よく管理できる。
Ｔ２８＝［（（Ｐ２８－Ｒ２８）／５０］×Ｂ＋Ｃ ・・・（４）
ただし、（４）式中のＴ２８はセメント組成物の材齢２８日の圧縮強さの目標値（Ｎ／ｍｍ２）、Ｐ２８はセメント組成物の材齢２８日の圧縮強さの予測値（Ｎ／ｍｍ２）、Ｒ２８はポルトランドセメントの材齢２８日の圧縮強さの実測値（Ｎ／ｍｍ２）、Ｂはビーライトクリンカの含有率（質量％）、および、Ｃはビーライトクリンカを用いて置換する対象となるポルトランドセメントの材齢２８日の圧縮強さの実測値（Ｎ／ｍｍ２）を表す。
Further, the target value (T 28 ) of the compressive strength of the cement composition, the predicted value (P 28 ) of the compressive strength of the cement composition calculated using the above formula (3), and the BELITE clinker of the present invention. By substituting the measured value (C) of the compressive strength of the Portland cement to be replaced using Equation (4) below, we can calculate the content of BELITE clinker required in the cement composition to achieve the target strength. The rate (substitution rate, B) can be calculated. These allow the compressive strength of the cement composition to be controlled with precision.
T 28 = [((P 28 - R 28 )/50]×B+C...(4)
However, in formula (4), T 28 is the target value (N/mm 2 ) of the compressive strength of the cement composition at the age of 28 days, and P 28 is the predicted compressive strength of the cement composition at the age of 28 days. value (N/mm 2 ), R 28 is the measured value (N/mm 2 ) of the 28-day-old compressive strength of Portland cement, B is the content rate (mass %) of Belite clinker, and C is Belite clinker content (% by mass). It represents the measured value (N/mm 2 ) of the compressive strength of 28-day-old Portland cement, which is to be replaced with light clinker.
以下、本発明を実施例により説明するが、本発明はこれらの実施例に限定されない。
１．ビーライトクリンカとセメントの製造
クリンカ原料として、石灰石、粘土、および鉄滓を用いて、該原料を調合して表１に記載の化学組成および水硬率の調合原料を得た。次に、ロータリーキルンを用いて、表１に記載の焼点温度で焼成して、ビーライトクリンカを製造した。表２に、蛍光Ｘ線分析により測定したビーライトクリンカの化学組成、ボーグ式により算出したビーライトクリンカ中の各種セメント鉱物（Ｃ３Ｓ、Ｃ２Ｓ、Ｃ３Ａ、およびＣ４ＡＦ）の含有率、および、リートベルト法により求めたビーライト（鉱物）中の各相（α－Ｃ２Ｓ、αＨ－Ｃ２Ｓ、αＬ－Ｃ２Ｓ、β－Ｃ２Ｓ、およびγ－Ｃ２Ｓ）の鉱物組成を示す。なお、表２中の前記ビーライトクリンカの化学組成等は、ＪＩＳ Ｒ ５２０４：２０１９「セメントの蛍光Ｘ線分析方法」に準拠して、蛍光Ｘ線分析装置（商品名「ＺＳＸ ＰｒｉｍｕｓＩＩ」、リガク社製）を用いて測定した。また、前記ビーライト中の各相の鉱物組成は、Ｘ線回折装置（商品名「Ｄ８ ＡＤＶＡＮＣＥ」、ブルカージャパン社製）、および、解析ソフトウェア（商品名「ＤＩＦＦＲＡＣ ｐｌｕｓ ＴＯＰＡＳ（Ｖｅｒ３．０）」、ブルカージャパン社製）を用いて、リードベルト法によって解析した。具体的には、Ｃ３Ｓ、Ｃ２Ｓ（各相）、Ｃ３Ａ、Ｃ４ＡＦ、およびカルサイトの各鉱物の理論プロファイルを、粉末Ｘ線回折の結果から得られた実測プロファイルにフィッティングして各晶質相の含有率を求めた。
また、表３に、エネルギー分散型Ｘ線分光器を備えた走査型電子顕微鏡を用いて求めたビーライトの化学組成、およびＣａＯ／ＳｉＯ２のモル比を示す。なお、前記ビーライトの化学組成等の測定は、加速電圧を１５ｋｅＶ、照射電流を１０００ｐＡに設定したエネルギー分散型Ｘ線分光器（ＥＤＳ）を用いて、分析時間が１分析点につき１０秒、観察倍率は２５００または５０００倍で、１５視野からビーライト粒子を１つ選択し、一粒子ごとに１５点、計２２５点を測定し、その平均値を求めた。
次に、前記ビーライトクリンカと普通ポルトランドセメントを、質量比で１：１で混合した後、ボールミルで粉砕してセメント組成物を製造した。セメント組成物を１００質量％として、ＳＯ３換算で２．０質量％になるよう石膏を添加して、ブレーンが３３００ｃｍ２／ｇになるよう粉砕してセメント組成物を調製した。
EXAMPLES Hereinafter, the present invention will be explained with reference to Examples, but the present invention is not limited to these Examples.
1. Production of Belite clinker and cement Limestone, clay, and iron slag were used as clinker raw materials, and the raw materials were mixed to obtain mixed raw materials having the chemical composition and hydraulic hardness listed in Table 1. Next, using a rotary kiln, the mixture was fired at the burning point temperature shown in Table 1 to produce BELITE clinker. Table 2 shows the chemical composition of BELITE clinker measured by X-ray fluorescence analysis, and the various cement minerals (C 3 S, C 2 S, C 3 A, and C 4 AF) in BELITE clinker calculated using the Borg equation. content and each phase in belite (mineral) determined by the Rietveld method (α-C 2 S, αH-C 2 S, αL-C 2 S, β-C 2 S, and γ-C 2 The mineral composition of S) is shown. The chemical composition of the B-Lite clinker in Table 2 was determined using a fluorescent X-ray analyzer (trade name: "ZSX Primus II", manufactured by Rigaku Co., Ltd.) in accordance with JIS R 5204:2019 "Fluorescent X-ray analysis method for cement". (manufactured by). In addition, the mineral composition of each phase in the belite was determined using an X-ray diffraction device (product name "D8 ADVANCE", manufactured by Bruker Japan) and analysis software (product name "DIFFRAC plus TOPAS (Ver. 3.0)"). (manufactured by Bruker Japan) and analyzed by the Riedveld method. Specifically, the theoretical profiles of the minerals C 3 S, C 2 S (each phase), C 3 A, C 4 AF, and calcite were fitted to the measured profiles obtained from the powder X-ray diffraction results. The content of each crystalline phase was determined.
Further, Table 3 shows the chemical composition of BELITE and the CaO/SiO 2 molar ratio determined using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer. The chemical composition of the BELITE was measured using an energy dispersive X-ray spectrometer (EDS) with an accelerating voltage of 15 keV and an irradiation current of 1000 pA, with an analysis time of 10 seconds per analysis point. The magnification was 2,500 times or 5,000 times, one Belite particle was selected from 15 fields of view, and measurements were taken at 15 points for each particle, a total of 225 points, and the average value was determined.
Next, the Belite clinker and ordinary Portland cement were mixed in a mass ratio of 1:1 and ground in a ball mill to produce a cement composition. A cement composition was prepared by adding gypsum to a cement composition of 100% by mass, and adding gypsum to a concentration of 2.0% by mass in terms of SO 3 and pulverizing the mixture to a Blaine of 3300 cm 2 /g.
２．セメントの圧縮強さの実測と予測
前記セメント組成物を用いて、ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に準拠してモルタル供試体を作製し、その圧縮強さを実測した。また、前記（３）式と表３のビーライトの化学組成（Ｐ２Ｏ５、ＳＯ３、Ｋ２Ｏ、およびＣａＯの含有率）を用いて、材齢２８日の圧縮強さを予測した。得られた圧縮強さの実測値と予測値を表４と図１に示す。
2. Actual Measurement and Prediction of Compressive Strength of Cement Using the above cement composition, a mortar specimen was prepared in accordance with JIS R 5201 "Physical Test Method for Cement", and its compressive strength was actually measured. Furthermore, using the above formula (3) and the chemical composition of BELITE (content of P 2 O 5 , SO 3 , K 2 O, and CaO) in Table 3, the compressive strength at 28 days of material age was predicted. . The obtained measured values and predicted values of compressive strength are shown in Table 4 and FIG. 1.
表４に示すように、圧縮強さは、比較例１～５の２７．０～３４．３Ｎ／ｍｍ２と比べ、実施例１～５では３５．７～３９．１Ｎ／ｍｍ２と高い。また、表４と図１に示すように、すべての実施例と比較例において、圧縮強さの実測値と予測値は高い精度で一致した。 As shown in Table 4, the compressive strength of Examples 1 to 5 is as high as 35.7 to 39.1 N/mm 2 compared to 27.0 to 34.3 N/mm 2 of Comparative Examples 1 to 5. Moreover, as shown in Table 4 and FIG. 1, in all Examples and Comparative Examples, the measured values and predicted values of compressive strength matched with high accuracy.
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