Gypsum & Lime
Online ISSN : 2185-4351
ISSN-L : 0559-331X
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Volume 1988, Issue 214
Displaying 1-8 of 8 articles from this issue
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  • Tobermorite and Calcium Silicate Products
    Takeshi MITSUDA
    1988 Volume 1988 Issue 214 Pages 129-140
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.129
    JOURNAL FREE ACCESS
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  • Durability Test of Marble Coated with Electron Beam Curable Coating
    Kenji SUGIMOTO, Yutaka TSURUTA, Tsutoinu MARUYAMA, Masao OGAWA
    1988 Volume 1988 Issue 214 Pages 141-146
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.141
    JOURNAL FREE ACCESS
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    Natural marble is a metamorphosed limestone.
    Marble is liable to give rise to staining and lose glossy surface with producing white powdering on the surface after one to five years due to attack of carbon dioxide and sulfur dioxide in the air and carbon dioxide dissolved in rain water while exposed to the outdoor. These result in losing its excellent merchandise value.
    This study was conducted to develop a method to prevent degradation of marble by various acids and of the surface-powdering of it due to outdoor exposure by achieving durable protective coating film on the surface by application of a non-solvent type electron beam (hereinafter referred to as EB) curable acrylic clear coating.
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  • Dehydration Kinetics of Calcium Sulfate Hemihydrate
    Derivation of a Dehydration Rate Equation Based on a New Reaction Model
    Toshikuni YONEMOTO, Yuji KOUSHIMA, Tosiharu ESASHI, Teiriki TADAKI
    1988 Volume 1988 Issue 214 Pages 147-152
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.147
    JOURNAL FREE ACCESS
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    The dehydration rate of calcium sulphate hemihydrate prepared.from chemical gypsum have been studied between 110°C and 140°C at partial pressures of water vapor 0.19kPa to 3.68kPa by using an isothermal thermogravimetric method.
    The sample have been observed before and after the dehydration reaction with the aid of the scanning electron microscope. It has been found that the hemihydrate sample has a thin plate-like crystal form and also that the crystal form has not changed during the progress of the reaction.
    Taking into account the experimental reaction rate data and the crystal form of the sample, new dehydration reaction model has been elaborated. The model is constructed by three elementary reaction steps occurring at the reaction plane in the crystal.
    Experimental rate data of various condition can be interpreted by the rate equation obtained from the new reaction model.
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  • Removal of Phosphorus in Electroless Nickel Waste Solutions by Volcanic Ash Soils
    Nobuie AYUZAWA, Takashi SUZUKI
    1988 Volume 1988 Issue 214 Pages 153-159
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.153
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    Removal characteristics of hypophosphorous and phosphorous ions in electroless nickel plating waste solution have been studied using two kinds of Yatugatake volcanic ash soils, which were named as Y-1 and Y-2.
    The results obtained are as follows.
    1) Y-2 is found to be allophane and Y-1 is the mixed systems of SiO2, Al2O3, and Fe2O3 components.
    2) Hypophosphorous and phosphorous ions in solution were both easily removed to Y-1 and Y-2 soils but the removal ratio decreased with increasing PH values from 3 to 10.
    3) Removal behavior of hypophosphorous and phosphorous ions is influenced by cations in solution.
    4) It was observed that removal ratio of hypophosphorous and phosphorous ions is increased by the saturated treatment with Fe ions.
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  • Influence of Fine Aggregate Size and Shape upon Fracture Toughness by Using Gypsum-Glass Composites
    Satoshi TERAMURA, Kouichi TSUKIYAMA
    1988 Volume 1988 Issue 214 Pages 161-168
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.161
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    In order to examine the effect of shape and size (0.01-10mm) of aggregates upon fracture toughness of material, the notch 3 points bending tests were carried out by using produced gypsum-glass composites. The compressive strength values were nearly constant independent of size and shape of aggregate, and Kmax values, too. J integral values (J1AE and Jpmax) and load softening time, Ts, of specimens contained round aggregates were similar to them of plain specimen. On the other hand, in the cases of angular aggregates, these values of specimens contained aggregates of 100-1000 micrometer diameter remarkably increased. The toughness was due to the mechanisms that fracture energy was absorbed into inflectional microcracks and debonding on the aggregate-matrix interface by inner stress, and that surface energy was increased by the detouring of crack front on aggregate interface. The number and size of microcrack nucleated by inner stress were influenced by the shape and size of aggregate.
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  • New Oxide Superconductors
    Yoshio ISHIZAWA
    1988 Volume 1988 Issue 214 Pages 169-176
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.169
    JOURNAL FREE ACCESS
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  • Man Made Gems
    Hironao KOJIMA
    1988 Volume 1988 Issue 214 Pages 177-182
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.177
    JOURNAL FREE ACCESS
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  • Aspect of Recent Steel Refining Process and Flux Use at Fukuyama Works
    Hideo UCHIBORI, Hitoshi KAWASHIMA
    1988 Volume 1988 Issue 214 Pages 183-187
    Published: May 01, 1988
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1988.183
    JOURNAL FREE ACCESS
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