Journal of the Ceramic Association, Japan
Online ISSN : 1884-2119
Print ISSN : 0366-9998
ISSN-L : 0366-9998
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Volume 47, Issue 563
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1939 Volume 47 Issue 563 Pages 565-566
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_565
    JOURNAL FREE ACCESS
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  • Glasses Containing Chrome Oxide, I
    K. Fuwa
    1939 Volume 47 Issue 563 Pages 567-569
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_567
    JOURNAL FREE ACCESS
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    Glass composed of 72% SiO2, 12 CaO, and 16R′2O has been taken as base glass, various studies have been made of glasses by replacing therein their CaO contents with Cr2O3 one after another. Chromium oxide used for a coloring agent has been Cr2O3. In base glasses whose R′2O is respectively Na2O and K2O if Cr2O3 content is respectively about 4% and more than 1% both glasses formed contain more insoluble black chromium oxide and have been found difficult to make them having uniform quality. When R′2O is Li2O and the amount of Cr2O3 is over 4% a green aventurine glass is obtained, when the like amount is 8% it becomes considerably difficult to be melted and when it is as much as 10% it becomes still more harder and substantially no vitreous state is resulted. Colors of glasses are in all cases green but potash glass is slightly yellowish. Next, sample glasses have been made into plates, polishing their both surfaces and measurements have been made for their transmission of various wave lengths in ultraviolet, vissible and infrared ranges. Judging from the form of transmission curve within vissible range there has been found that the position and grade of selective absorption are somewhat different according to kinds of alkali.
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  • STUDIES ON BLENDED CEMENTS, IV
    Kozaburo Watanabe
    1939 Volume 47 Issue 563 Pages 570-571
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_570
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    1. Influence of mixing water content on concrete strength.
    Influence of mixing water content on the early concrete strength of blended cements is little more than that of portland cement, but the strength at 28 days is almost the same.
    2. Water cement ratio and workability of concrete.
    The workability of concrete normally used at the field is given as following. For road 2-4cm, for building 19-23cm slump. When we use the blended or portland cement, these workability are given by the same water cement ratio.
    3. The age at which the highest strength reached.
    For the blended cement 6 or 9 months strength of 1:3 mortar and 1 year strength of concrete are highest. For portland cement 3 months strength of mortar and 6 months strength of concrete are also highest. The index of increasing strength of blended cements is greater than that of portland cements The following figure shows the index of increasing strength of mortars and concretes. (We adoptep the 28 days strength as standard.)
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  • [title in Japanese]
    [in Japanese]
    1939 Volume 47 Issue 563 Pages 572-574
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_572
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1939 Volume 47 Issue 563 Pages 574-581
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_574
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1939 Volume 47 Issue 563 Pages 582-585
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_582
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  • [title in Japanese]
    1939 Volume 47 Issue 563 Pages 586-594
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_586
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  • [title in Japanese]
    1939 Volume 47 Issue 563 Pages 601-602
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_601
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1939 Volume 47 Issue 563 Pages ap1-ap5
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_ap1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1939 Volume 47 Issue 563 Pages ap6-ap8
    Published: November 01, 1939
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.2109/jcersj1892.47.563_ap6
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