Journal of the Ceramic Association, Japan
Online ISSN : 1884-2127
Print ISSN : 0009-0255
ISSN-L : 0009-0255
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Volume 62, Issue 703
Displaying 1-17 of 17 articles from this issue
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  • Gypsum Slag Cement, (II)
    Exciters and additional substances
    Renichi KONDO
    1954 Volume 62 Issue 703 Pages 741-746
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_741
    JOURNAL FREE ACCESS
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    Among the various kinds of sulphate exciters, anhydrite seems to be the most desirable one for the grindability and the hardenability of gypsum slag cement. The proper amount of sulphate to be added was rather of wide range. Special cares should be taken to determine the optimum quantity of alkaline exciter, when the impure sulphates, e. g. by-produced gypsum with free acids, or auhydrite with free lime, formed through calcination at higher temperature are to be used.
    Light burned pure magnesia, together with di-calcium silicate, was useful for the surface hardening properties, though they were not so effective on the accerelation of hardening in its initial stage. This defect could be eliminated by the further addition of clinker, Ca(OH)2, or NaOH, each about 1%.
    The substitution of granulated slag with devitrified one decreased the hardenability of cement, especially when the slag had lower basicity and the degree of substitution was high. On the one hand, the partial substitution of slag with puzzolan improved the quality of cement in a special case.
    Further addition of sulphate and chloride of calcium had a little influence on the setting and hardening of this kind of cement; magnesium salts, on the contrary, remarkably delayed it.
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  • Erratum to : Study on the Syntheses of Various Minerals closely related with Chromite Series Refractories
    1954 Volume 62 Issue 703 Pages 746
    Published: 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_746
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  • Some Studies on Matrix in Silica Brick, (II)
    Evolution of mineral assemblage in Matrix during firing
    O. SUGA, N. NAMEISHI
    1954 Volume 62 Issue 703 Pages 747-752
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_747
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  • Quantitative Determination of Quartz with X-Ray Diffraction by means of Geiger-Counter X-Ray Spectrometer
    Shinichi IWAI, Shigekazu UDAGAWA
    1954 Volume 62 Issue 703 Pages 753-757
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_753
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    The writers attempted the quantitative determination of quartz in Iwaki clay and calcined lungs of silicosis patients by means of Geiger-counter X-ray spectrometer in two different ways. In the first place, they followed the technique proposed by Clark and Reynolds, with some modifications for the use of Geiger-counter X-ray spectrometer in order to make an accurate intensity measurements. In the second place, they adopted a method newly devised by themselves, in which the amounts of quartz (x%) were determined from the following equation; x=100⋅a⋅(IQ/IF)1/100{(IQ/IF)2-(IQ/IF)1}+a(IQ/IF)2(%)
    a: the amount of quartz further added to the original material.
    (IQ/IF)1: the intensity ratio between quartz and fluorite in a specimen in which constant amount of fluorite was added to the original material.
    (IQ/IF)2: the intenity ratio between quartz and fluorite in a specimen in which known amount of quartz (a%) and fluorite were added to the original material.
    Fair similarities were seen between the values obtained by these two methods.
    Geiger-counter X-ray spectrometer used for this study was constructed by the present writers' themselves.
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  • Studies on Sedimentation of Clay, (II)
    Utilization of Natorium Alginate
    Yoichi SHIRAKI
    1954 Volume 62 Issue 703 Pages 758-763
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_758
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  • Studies on Limestone, Lime and Slaked Lime, (V)
    The differential thermal analysis of limestone samples
    Y. Ohno
    1954 Volume 62 Issue 703 Pages 764-767
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_764
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    The differential thermal analysis of many kinds of foreign limestone have been presented. The author gave chemical analysis to 200 samples of Japanese limestone from different deposit and differential thermal analysis to 60 of them.
    The results are as follows;
    1. The decomposition begins at about 800°C and comes to an end by nearly 950°C.
    2. The finer the crystals are, the lower the reaction temperatures are.
    3. SiO2 content in the samples has a little influence to the thermal characteristics.
    4. Some samples containing organic substances show exothermic reaction.
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  • Shaking Type Corrosion Tester for Refactory Brick
    Toshiyuki SATA, Raisaku KIYOURA
    1954 Volume 62 Issue 703 Pages 768-772
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_768
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    The new type of refractory corrosion tester was made by authors and tried to operate for various bricks with various slags The small furnace (inner capacity 110×110×50mm), contained 500-1000 grams of molten slag with 5-10 mms layer was shaken on the 4 rollers 25 times per minute with maximum inclined degrees of 20° being heated at about up to 1600°C, then in these conditions the small brick specimens were seriously corroded as groove. The corrosion depths measured within the error of 1mm were sufficient to indicate the differences of corrosion resistance of various bricks. Although such a tester has the very small type, it is not only providing to us much informations of using brick to a large furnace, but we can use this tester to study on the various other phenomena which would happen in actual metallurgical and chemical industrial furnaces.
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  • Studies on Purification of the Iwate Fireclay by Washing
    Suzuo UEDA
    1954 Volume 62 Issue 703 Pages 773-775
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_773
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    [in Japanese]
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  • Effects of the Modification of Gypsum on Setting and Hardening of Portland Cement
    Toshiyoshi YAMAUCHI, Renichi KONDO, Min-Chuan LAI
    1954 Volume 62 Issue 703 Pages 776-779
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_776
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    The change of setting and hardening of Portland cement owing to the addition of various modification of gypsum was measured with the results as follows:
    1) As for di-hydrate, though the setting time was retarded to fall within the limits of the specification by the addition of 1% SO3, yet over 3% SO3 was more desirable. Next as for β-hemihydrate and β-soluble anhydrite, 0.8-1.5% SO3 was adequate, while 3% addition caused rapid setting. By the addition of insoluble andydrite above 1%SO3, final setting was improved normally, initial setting, however, could not be delayed satisfactory even if its amount was largely raised.
    2) To the mortar strength, SO3 content had a closer relation than the type of modification. And the maximum strength was generally found in about 3% SO3.
    3) The increasing of additional gypsum has been occasionally pointed out as a mean of obtaining better quality, SO3 content, however, of commercial cement was limited down to 1.1-1.5% in most cases. It seemed to be due to the anxiety of the false setting owing to the dehydration of gypsum in an industrial grinding mill.
    4) The influences on setting and hardening of portland cement, of phosphuric acid, sulphuric acid and insoluble anhydrite as the impurities of byproduct gypsum, were also examined.
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  • Heat Transmission through Molten Glasses
    M. KUNUGI, S. TANAKA, S. SHIMIZU, K. KITAMURA
    1954 Volume 62 Issue 703 Pages 780-784
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_780
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    On the three commercial glasses the vertical temperature gradients at the center of the molten mass and near the side wall in a experimental furnace were determined. From these data and the results obtained by Halle and Turner for the glasses containing varying amount of iron oxide a heat balance was drawn up and the heat k (cal/cm. sec. °C) transmitted through the various glasses was calculated. The results representing the relation between calculated k and the iron content of glasses were plotted for the practical use. For example, the numerical value of k increased from 0.011 to 0.021% as the FeO rose from 0.30 to 0.15% for a constant Fe2O3 of 0.30%. The absorption coefficient of the glasses was also discussed.
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  • Studies on the Effects of Repeated Heating and Cooling Tests to Portland Cement Hardened Pieces
    Shoichiro NAGAI, Naokazu TANNO, Shinichi ASAHARA
    1954 Volume 62 Issue 703 Pages 785-789
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_785
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    In the Japanese Industrial Standards of electric insulator [JIS C 3801 (1953)], there is the method of repeated heating and cooling test for electric porcelain insulator. In the present paper, the tests were carried by test pieces of hardened neat Portland cement with or without adding fine powder of broken scrap electric insulater (Scherben), by comparing the percentage decrease of bending and compressive strengths. Considerable decrease of strength was observed, when the heating was carried at relatively high temperature (80·100°C) water bath, and on the contrary, very small decrease was observed, when heating was carried at relatively lower temperature (under 40·50°C) water bath. This effect of strength decrease by heating in water bath of high temperature was considered to be due to the change of crystallization water of hydrated compounds, e. g., xCaO⋅SiO2⋅yH2O, mCaO⋅Al2O3⋅nH2O, etc., in hardened cement, and carried out various comparison tests to discuss fully this effect.
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  • [title in Japanese]
    [in Japanese]
    1954 Volume 62 Issue 703 Pages 790-795
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_790
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  • [title in Japanese]
    [in Japanese]
    1954 Volume 62 Issue 703 Pages 796-799
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_796
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  • [title in Japanese]
    1954 Volume 62 Issue 703 Pages 800
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_800
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  • [title in Japanese]
    1954 Volume 62 Issue 703 Pages 801
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_801
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1954 Volume 62 Issue 703 Pages 802-803
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_802
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  • [title in Japanese]
    1954 Volume 62 Issue 703 Pages 804-809
    Published: December 01, 1954
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1950.62.703_804
    JOURNAL FREE ACCESS
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