石膏と石灰
Online ISSN : 2185-4351
ISSN-L : 0559-331X
1968 巻, 92 号
選択された号の論文の5件中1~5を表示しています
  • 永井 彰一郎, 鈴木 一孝, 細江 政弘, 星谷 勝義
    1968 年 1968 巻 92 号 p. 3-7
    発行日: 1968/01/01
    公開日: 2011/03/07
    ジャーナル フリー
    The effects of alhali on the physical quality of autoclaved lightweight concrete was examined. Slaked lime from carbide acetylene plant, siliceous stone and blast furnace slag were mixed in various proportion. These mixtures were kneaded with 6% Na2CO3 solution and were made in paste specimens. The bulk densities of them were controled by the quantity of aluminum powder added to be O. 6, 0.8 and 1. 1, and these specimens were cured in an autoclave at 180°C for 8 hours. When blast furnace slag was mixed and kneaded with 6% Na2CO3 solution, the strength was developed by the activated action of Na on the slag, and when the ratio of CaO to SiO2 in chemical composition was 4 : 5, it showed the most developed strength. It is seemed that the action of Na on strength was caused by absorbing Si02 from slag and advanced the growth of tobermorite. Heat conductivity increased when slag was added, but bulk density and water absorption decreased.
  • 西川 保重
    1968 年 1968 巻 92 号 p. 7-11
    発行日: 1968/01/01
    公開日: 2011/08/16
    ジャーナル フリー
    CaO is extracted as a soluble Ca-sucrates from calcined dolomite by the solution of cane suger. Casucrates solution is decomposed into CaCO3 and sucrose by blowing CO2 etc. and the sucrose is recovered for reuse. Studies were made to increase the content of MgO by extracting the proper amount of CaO from the dolomite which is consisted of low content of MgO, rather than separating MgO and CaO completely from dolomite.
    It has been reported that the compounds such as C12H22O11·CaO, C12H22O11·2CaO and C12H22O11·3CaO are known in the system between sucrose and CaO and the solubility of CaO into sucrose solution changes depending on the rate of formation of the above mentioned Ca-sucrates, and the activity of CaO tends on the formation conditions of sucrates. However, the details of these have not been fully investigated.
    In this study, the extracted amount of CaO is examined under various conditions by using the mixture of Mg (OH) 2 and Ca (OH) 2 reagent both in 3 : 7 weight ratio first, and for the calcined dolomite next. The solution of soluble calcium sucrate produced by extracting calcium from the mixture and calcined dolomite is dissociated by (NH4) 2CO3 instead of CO2. The content of MgO in the residue and that of Ca CO3 in the precipitate.
    If calcination temperature of the used dolomite is too low, undissociated CaCO3 is remained and if it is too high, considerable amount of CaO is mixed into MgO as the calcium silicates of insoluble form. The recovery of sucrose is the most important problem for the production in commercial scale, but it has not been discussed in this experiments.
  • 袋 孝一
    1968 年 1968 巻 92 号 p. 12-15
    発行日: 1968/01/01
    公開日: 2011/03/07
    ジャーナル フリー
  • 岡 淳平
    1968 年 1968 巻 92 号 p. 15-23
    発行日: 1968/01/01
    公開日: 2011/03/07
    ジャーナル フリー
  • Manuel Mateos
    1968 年 1968 巻 92 号 p. 24-30
    発行日: 1968/01/01
    公開日: 2011/03/07
    ジャーナル フリー
    近年,わが国において石灰による土じょう安定処理についての関心が高まりつつある。本資料は,アイオア州立大学で行なわれたソイル石灰に関する研究の集録であり,土が物理化学的変化を受け土の土質工学的性質を改良することを示している。これから石灰による土じょう安定処理を手がける場合の参考資料として適当なものである。
    本文の最後に,訳者注として土質工学用語の説明,わが国で行なわれている生石灰による土じょう安定処理に関する文献などについて付記した。
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