JP3637979B2 - Clinker cooling rate judgment method and cement strength prediction method - Google Patents
Clinker cooling rate judgment method and cement strength prediction method Download PDFInfo
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- JP3637979B2 JP3637979B2 JP09309695A JP9309695A JP3637979B2 JP 3637979 B2 JP3637979 B2 JP 3637979B2 JP 09309695 A JP09309695 A JP 09309695A JP 9309695 A JP9309695 A JP 9309695A JP 3637979 B2 JP3637979 B2 JP 3637979B2
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- cement
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- strength
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【０００１】
【産業上の利用分野】
本発明は、クリンカー及びセメントを構成するクリンカーの冷却速度判定方法及びセメントの強度予測方法に関する。
【０００２】
【従来の技術】
セメントの強度発現性に重要な影響を及ぼす要因として、クリンカー及びセメントを構成するクリンカーの冷却速度が知られている。そして、冷却速度はクリンカー中に含まれるビーライトの色調やラメラの状態を顕微鏡により観察し、判定されていた。この技術は、冷却速度の高低によってビーライトの色調やラメラの状態が変化することを利用したものである。
【０００３】
セメントの強度予測は、顕微鏡によるビーライトの色調，大きさ及びエーライトの大きさ及び複屈折を測定することによって行なわれていた。
【０００４】
プロファイルフィッティング法については、例えば文献Ｈ．Ｔｏｒａｙａ：Ｊ．Ａｐｐｌ．Ｃｒｙｓｔ．Ｖｏｌ．２３．Ｐ．４８５〜４９１（１９９０）がある。
【０００５】
【発明が解決しようとする課題】
上記した従来技術は顕微鏡観察による方法であるがために熟練を要する上に個人差が大きく、数値化，定量化ならびに自動計測が困難である等の課題があった。
本発明は上記課題を解決するためになされたものであり、定量的にクリンカーの冷却速度を判定すること、及びセメントの強度発現性を予測できるようにしたクリンカーの冷却速度判定方法及びセメントの強度予測方法を提供することを目的としている。
【０００６】
【課題を解決するための手段】
本発明の［請求項１］に係るクリンカーの冷却速度判定方法は、クリンカー及びセメント中に含まれるフェライト相の粉末Ｘ線回折パターンをプロファイルフィッティング法により冷却速度の異なる複数の回折パターンに分解し、前記複数の回折パターンの積分強度の比率からクリンカー及びセメントを構成するクリンカーの冷却速度を判定できるようにした。
【０００７】
本発明の［請求項２］に係るクリンカーの冷却速度判定方法は、［請求項１］において、回折パターンは、クリンカー及びセメント中に含まれるフェライト相の０２０面を対象とすることにした。
【０００８】
本発明の［請求項３］に係るセメントの強度予測方法は、クリンカー及びセメント中に含まれるフェライト相の粉末Ｘ線回折パターンをプロファイルフィッティング法により冷却速度の異なる複数の回折パターンに分解し、前記複数の回折パターンの積分強度の比率と、実測したセメントの強度との関係から求めた関係式を用いて未実測なセメントの強度を予測できるようにした。
【０００９】
本発明の［請求項４］に係るセメントの強度予測方法は、クリンカー及びセメント中に含まれるフェライト相の粉末Ｘ線回折パターンをプロファイルフィッティング法により冷却速度の異なる複数の回折パターンに分解し、実測したセメントの強度と、前記複数の回折パターンの積分強度の比率、更にはセメント中のエーライト相のＭ3 相とＭ1 相の合量に対する各相の割合（Ｖｏｌ．％）との関係から求めた関係式を用いて未実測なセメントの強度を予測できるようにした。
【００１０】
【実施例】
以下、実施例を説明する。
先ず、予め冷却速度が既知であるＡ（急冷），Ｂ（中間），Ｃ（徐冷）の３種類のクリンカーを準備し、サリチル酸メタノール法によって間隙質のみとし、粉末Ｘ線回折測定用試料とする。これらのクリンカー中のフェライト相０２０面の回折パターンを求め、そのパターンをプロファイルフィッティング法によって再現するのに必要な各種パラメータを求めておく。
【００１１】
次に、図１に示されるように冷却速度が未知であるクリンカー及びセメント中のフェライト相の０２０面の回折パターンをプロファイルフィッティング法（パターン分解法）により、図示３本の回折パターンに分解する。これら３本の回折パターンの積分強度の比率からクリンカー及びセメントを構成するクリンカーの冷却速度を判定することが可能となる。
【００１２】
冷却速度未知のセメント中に含まれるフェライト相の回折パターンを上述した方法に従って冷却速度の異なるＡ，Ｂ，Ｃの各クリンカー中に含まれるフェライト相の回折パターンに分解し、各パターンの積分強度の比率を求めた。図２にクリンカーＡ中に含まれるフェライト相の積分強度の全積分強度に対する比率（以下、ａと称する）と、セメントの２８日圧縮強度との関係を示す。
【００１３】
両者には良好な相関関係が確認され、２８日圧縮強度（ｋｇｆ／ｃｍ2 ）＝６．０６２×ａ（％）＋２２７．６１３という関係式を得た。相関係数は０．８０である。従って冷却速度未知のセメント中に含まれるａを求め、上式に代入すれば、未実測のセメントの強度発現性を予測することが可能である。
【００１４】
ポルトランドセメントクリンカー中のエーライト相は、ほとんどＭ3 相とＭ1 相の２相により構成されている。そこで、プロファイルフィッティング法によりセメント中のエーライト相中のＭ3 相の体積比率（以下、ｂと称する）を求め、上記ａとｂを変数とし、重回帰分析により実測されたセメントの２８日圧縮強度（ｋｇｆ／ｃｍ2 ）との関係を求めた。その結果、２８日圧縮強度（ｋｇｆ／ｃｍ2 ）＝２８０＋６．１５ａ（％）＋０．３７ｂ（Ｖｏｌ．％）（重相関係数０．８２）という関係式を得た。
【００１５】
図３にこの式によって推定される圧縮強度と実測された圧縮強度との関係を示す。残差の標準偏差（ＳＤ）は１１．３ｋｇｆ／ｃｍ2 である。従ってセメントの２８日圧縮強度は、冷却速度のみからも推定可能であるが、エーライト中のＭ3 相の比率をプロファイルフィッティング法により求め、その測定結果も加えることにより、より精度高くセメントの圧縮強度を予測すること可能である。ここで、エーライト相中のＭ3 相の比率は公知の顕微鏡によるポイントカウンティング法によっても求めることができる。
【００１６】
【発明の効果】
以上説明したように、本発明によりクリンカー及びセメントを構成するクリンカーの冷却速度とセメントの強度発現性を粉末Ｘ線回折を利用して個人差なく推定することが可能となった。更に数値化，定量化及び自動計測が可能となり、セメントの品質管理工程が大いに能率化される。
【図面の簡単な説明】
【図１】プロファイルフィッティング法によるセメント中のフェライト相の回折パターンを冷却速度が既知で異なるクリンカー中のフェライト相３本の回折パターンに分解した様子を示す一例図。
【図２】分解後における急冷クリンカーＡ中に含まれるフェライト相の積分強度の全積分強度に対する比率（ａ）と２８日圧縮強度との関係図。
【図３】推定圧縮強度と実測圧縮強度との関係図。[0001]
[Industrial application fields]
The present invention relates to a method for determining a cooling rate of a clinker constituting a clinker and a cement and a method for predicting the strength of the cement.
[0002]
[Prior art]
A cooling rate of the clinker and the clinker constituting the cement is known as a factor that significantly affects the strength development of the cement. The cooling rate was determined by observing the color tone of the belite contained in the clinker and the state of the lamella with a microscope. This technology uses the fact that the color tone of the belite and the state of the lamella change depending on the cooling rate.
[0003]
Cement strength predictions were made by measuring the color and size of belite with a microscope and the size and birefringence of alite.
[0004]
For the profile fitting method, see, for example, Document H. Toraya: J.M. Appl. Cryst. Vol. 23. P. 485-491 (1990).
[0005]
[Problems to be solved by the invention]
Although the above-described conventional technique is a method based on a microscope observation, there are problems such as requiring skill and great individual differences, making it difficult to quantify, quantify, and automatically measure.
The present invention has been made in order to solve the above-mentioned problems, and it is possible to quantitatively determine the cooling rate of the clinker, and to determine the cooling rate of the clinker so as to predict the strength development of the cement and the strength of the cement. It aims to provide a prediction method.
[0006]
[Means for Solving the Problems]
The method for determining a cooling rate of a clinker according to [Claim 1] of the present invention decomposes a powder X-ray diffraction pattern of a ferrite phase contained in a clinker and cement into a plurality of diffraction patterns having different cooling rates by a profile fitting method, The cooling rate of the clinker constituting the clinker and the cement can be determined from the ratio of the integrated intensities of the plurality of diffraction patterns.
[0007]
In the method for determining the cooling rate of the clinker according to [Claim 2] of the present invention, the diffraction pattern in [Claim 1] is intended for the 020 plane of the ferrite phase contained in the clinker and cement.
[0008]
In the cement strength prediction method according to [Claim 3] of the present invention, the powder X-ray diffraction pattern of the ferrite phase contained in the clinker and the cement is decomposed into a plurality of diffraction patterns having different cooling rates by a profile fitting method, An unmeasured cement strength can be predicted using a relational expression obtained from the relationship between the integrated intensity ratio of a plurality of diffraction patterns and the measured cement strength.
[0009]
The cement strength prediction method according to [Claim 4] of the present invention decomposes the powder X-ray diffraction pattern of the ferrite phase contained in the clinker and the cement into a plurality of diffraction patterns having different cooling rates by the profile fitting method, From the relationship between the intensity of the cement and the ratio of the integrated intensity of the plurality of diffraction patterns, and the ratio of each phase to the total amount of the M 3 phase and M 1 phase of the alite phase in the cement (Vol.%) The strength of unmeasured cement can be predicted using the obtained relational expression.
[0010]
【Example】
Examples will be described below.
First, three types of clinker of A (rapid cooling), B (intermediate), and C (slow cooling), whose cooling rates are known in advance, are prepared, and only the porosity is obtained by the salicylic acid methanol method. To do. The diffraction pattern of the
[0011]
Next, as shown in FIG. 1, the diffraction pattern of the 020 plane of the ferrite phase in the clinker and cement whose cooling rate is unknown is decomposed into three diffraction patterns shown in the figure by a profile fitting method (pattern decomposition method). The cooling rate of the clinker constituting the clinker and the cement can be determined from the ratio of the integrated intensities of these three diffraction patterns.
[0012]
The diffraction pattern of the ferrite phase contained in the cement whose cooling rate is unknown is decomposed into the diffraction pattern of the ferrite phase contained in each clinker of A, B, and C having different cooling rates according to the method described above, and the integrated intensity of each pattern is The ratio was determined. FIG. 2 shows the relationship between the ratio of the integral strength of the ferrite phase contained in clinker A to the total integral strength (hereinafter referred to as a) and the 28-day compressive strength of cement.
[0013]
A good correlation was confirmed between the two, and a relational expression of 28-day compressive strength (kgf / cm 2 ) = 6.062 × a (%) + 227.613 was obtained. The correlation coefficient is 0.80. Therefore, if the a contained in the cement whose cooling rate is unknown is obtained and substituted into the above equation, it is possible to predict the strength development of the unmeasured cement.
[0014]
The alite phase in the Portland cement clinker is almost composed of two phases, the M 3 phase and the M 1 phase. Therefore, the volume ratio of the M 3 phase in the alite phase in the cement (hereinafter referred to as b) is obtained by the profile fitting method, and the 28-day compression of the cement measured by multiple regression analysis using the above a and b as variables. The relationship with the strength (kgf / cm 2 ) was determined. As a result, a relational expression of 28-day compressive strength (kgf / cm 2 ) = 280 + 6.15a (%) + 0.37b (Vol.%) (Multiple correlation coefficient 0.82) was obtained.
[0015]
FIG. 3 shows the relationship between the compression strength estimated by this equation and the actually measured compression strength. The standard deviation (SD) of the residual is 11.3 kgf / cm 2 . Therefore, the 28-day compressive strength of cement can be estimated from the cooling rate alone, but the proportion of M3 phase in alite is obtained by the profile fitting method, and the measurement results are added to obtain a more accurate compressive strength of cement. Can be predicted. Here, the ratio of the M 3 phase in the alite phase can also be determined by a known point counting method using a microscope.
[0016]
【The invention's effect】
As described above, according to the present invention, it became possible to estimate the cooling rate of the clinker constituting the clinker and the cement and the strength development of the cement without individual differences using powder X-ray diffraction. In addition, quantification, quantification and automatic measurement become possible, and the quality control process of cement is greatly streamlined.
[Brief description of the drawings]
FIG. 1 is an example showing a state in which a diffraction pattern of a ferrite phase in a cement is decomposed into three diffraction patterns in a clinker having a known cooling rate by a profile fitting method.
FIG. 2 is a graph showing the relationship between the ratio (a) of the integral strength of the ferrite phase contained in the quenched clinker A after decomposition to the total integral strength and the 28-day compressive strength.
FIG. 3 is a relationship diagram between estimated compression strength and measured compression strength.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09309695A JP3637979B2 (en) | 1995-03-27 | 1995-03-27 | Clinker cooling rate judgment method and cement strength prediction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09309695A JP3637979B2 (en) | 1995-03-27 | 1995-03-27 | Clinker cooling rate judgment method and cement strength prediction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08259287A JPH08259287A (en) | 1996-10-08 |
| JP3637979B2 true JP3637979B2 (en) | 2005-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09309695A Expired - Fee Related JP3637979B2 (en) | 1995-03-27 | 1995-03-27 | Clinker cooling rate judgment method and cement strength prediction method |
Country Status (1)
| Country | Link |
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| JP (1) | JP3637979B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2134680B1 (en) * | 1994-05-26 | 2000-05-01 | Vargas Munoz Miguel | PREDICTION OF THE RESISTANCES OF THE CLINKER OR CEMENT, USING CRYSTALLOGRAPHIC FACTORS OF ITS CONSTITUENT MINERALS, DETERMINED BY DIFRACTION OF RX. |
| AU751674B2 (en) * | 1999-06-21 | 2002-08-22 | Fct-Actech Pty Ltd | Method and apparatus for X-ray diffraction analyses |
| AUPQ109499A0 (en) * | 1999-06-21 | 1999-07-15 | Adelaide Brighton Management Limited | Sample presentation for x-ray diffraction |
| ES2167273B2 (en) * | 2000-10-19 | 2003-04-01 | Univ Alicante | METHOD FOR QUANTIFICATION OF CEMENT IN MORTARS AND CONCRETE BASED ON X-RAY DIFFACTION. |
| JP5924436B1 (en) * | 2015-03-18 | 2016-05-25 | 住友大阪セメント株式会社 | Cement clinker composition, method for producing the same, and moderately heated Portland cement composition |
| JP7184604B2 (en) * | 2018-11-15 | 2022-12-06 | 太平洋セメント株式会社 | Method for estimating hydration reactivity of clinker |
-
1995
- 1995-03-27 JP JP09309695A patent/JP3637979B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH08259287A (en) | 1996-10-08 |
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