巻号一覧
1985 巻 (1985)
- 199 号 p. 357-
- 198 号 p. 245-
- 197 号 p. 183-
- 196 号 p. 121-
- 195 号 p. 61-
- 194 号 p. 3-
前身誌
1985 巻, 199 号
選択された号の論文の8件中1～8を表示しています
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Shoji SATO, Makoto WATANABE, Tamotsu YAMADA1985 年 1985 巻 199 号 p. 357-362
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーCalcium bis (phosphorodiamidate) dihydrate, Ca [PO2 (NH2) 2] 2· 2H2O, was made by adding an aqueous calcium chloride solution to an aqueous sodium phosphorodiamidate solution and then by adding acetone into the resulting mixed solution. The phosphorodiamidate was stable at room temperature, while it was decomposed with water to phosphoramidate and orthophosphate at a higher temperature. The phosphorodiamidate was condensed to polyphosphates with P-O-P and P-N (H)-P linkages by heating at a temperature higher than 100°C and finally converted to calcium metaphosphate in air above 700°C. The thermal product produced above 700°C in dried N2 was amorphous polyphosphates containing an imino group.抄録全体を表示PDF形式でダウンロード (607K) -
鋤本 峻司, 原 尚道, 向山 廣1985 年 1985 巻 199 号 p. 363-370
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーThe effects of salts, such as NaCl, NH4C1, NaNO3, NH4NO3 and CH3COONH4 were investigated experimentally on the formation of α-hemihyrates when heated in these aqueous salts solution with concentrations ranging from 8 to 15 wt % at the boiling point under the atmospheric pressure.
The formation time of α-hemihydrates, elevation of the boiling point and change of the transformation temperature were measured in these conditions, respectively.
The transformation temperature was determined as an intersection of the solubility curve of gypsum and that of α-hemihydrate.
The results obtained are summarised as follows :
1) Decrease of the transformation temperature in the aqueous salts solution affects predominantly the formation of α-hemihydrate.
Namely, the more the decrease of the temperature is, the more readily α-hemihydrate is formed. On the contrary, the effect of the elevation of the boiling point is small compared with the abovementioned.
2) Assuming that the solubility at the boiling point of gypsum is Ds and that of a-hemihydrate is as, the difference of both solubilities, Ds-as, is inversely correlated with the readiness of the formation of α-hemihydrates when heated at the boiling point.
This gives a criterion to choose a suitable salt which accelerates the formation of a-hemihydrates under the atmospheric pressure.抄録全体を表示PDF形式でダウンロード (867K) -
鳥飼 紀雄, 津川 久博, 松田 應作1985 年 1985 巻 199 号 p. 371-377
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーInfluence of activators (Ca (OH) 2, Al2 (SO4) 3, Na2SO4, AlCL3) on hydration of supersulfated slag cement, reaction product and strength of hardened body was investigated. The results were summarized as follows :
(1) Hydration proceeded above pH 11, activators which gave higher initial pH promoted initial hydration preferably.
(2) Developement of the compressive strength and the structure of hardened body related closely to initial pH. At initial pH above 12.3 needle-like ettringite was produced rapidly and the initial strength was large but after that did not increase so much. In the range of initial pH 11. 7-12. 3, dense structure was observed. Consequently, the initial strength and the subsequent developement were satisfactory. At initial pH below 11. 7, the strength developed slowly and dense structure was achieved at the age of 14 days.
(3) Between hydration rate X and compressive strength Y, a relation of Y=0.1 X3 was obtained. Initial compressive strength was nearly proportional to production rate of ettringite and generated CSH contributed to subsequent increase of strength. A relation between relative CSH production rate X and compressive strength Y was Y=3.6X2.抄録全体を表示PDF形式でダウンロード (1111K) -
島田 欣二1985 年 1985 巻 199 号 p. 378-386
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1198K) -
木崎 甲子郎, 目崎 茂和1985 年 1985 巻 199 号 p. 386-392
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1356K) -
Trevor Dingle, Barrie W. Griffths, 竹田 俊二1985 年 1985 巻 199 号 p. 393-394
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (206K) -
先端技術をさぐる荒井 康夫, 安江 任1985 年 1985 巻 199 号 p. 395-405
発行日: 1985/11/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1489K) -
1985 年 1985 巻 199 号 p. 408
発行日: 1985年
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (106K)
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