巻号一覧
前身誌
1964 巻, 70 号
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寺岡 一郎, 加納 二朗1964 年 1964 巻 70 号 p. 96-99
発行日: 1964/05/01
公開日: 2011/03/07
ジャーナル フリーWe have reported our study on the hydro expanding plaster mold. We explained that these expanding phenomena caused by the changing surface energy of water saturated with CaSO4 between silica grains. We have found a new fact that silica glass powder represent excellent effective expansion more than quartz sand. However, the surface free energy of silica glass decrease in various vapor atmospheres. We have measured these changes of expansion of silica glass against elapsing of time.
Furthermore, We have used Nay on silica glass and obtanied effective results.
Data we obtained were almost satisfactory and showed our theory of the mechanism on the hydro expanding plaster mold.抄録全体を表示PDF形式でダウンロード (542K) -
鈴木 一孝, 金子 和広, 長谷川 竜三, 檜山 真平, 永井 彰一郎1964 年 1964 巻 70 号 p. 100-107
発行日: 1964/05/01
公開日: 2011/03/07
ジャーナル フリーThe usefulness of alkali kneading solutions on the contraction of the lime-slag cement was examined.
The dilute solutions (about 5 percent) of NaOH, Na2CO3 and Na2SO4 improve the low strength and the slow setting time of this kind of cement kneaded with water and contribute to decrease the contraction of the cement mortar. These of high slag content show more great contraction than those of low slag content and the finer slag brings the same tendency on the contraction.
In general, as all the samples show a fairly large contraction at earlier short time, about one or three days after setting, the time to measure the initial standard length affect very great difference on the total contraciion ratios.抄録全体を表示PDF形式でダウンロード (955K) -
笠井 順一, 井上 博統, 中原 万次郎1964 年 1964 巻 70 号 p. 108-110
発行日: 1964/05/01
公開日: 2011/03/07
ジャーナル フリーWe observed that dolomite plaster (or hydrated lime) which contained Alunite had the property of hardening under water.
The fundamental reaction is that :
(1) Al2O3 in Alunite reacts with Ca (OH) 2 and forms calcium aluminates.
(2) SO3 in Alunite reacts, with Ca (OH) 2 and forms CaSO4·2H2O.
(3) Calcium aluminates reacts with CaSO4·2H2O and forms C3A 3CaSO4 ·31-32H2O.
If dolomite plaster (or hydrated lime) contains soluble Al2 (SO4) 3 or Alum (chemical reagent), the resulting plaster is usually very quick-setting.
Self-hardening dolomite plaster (or hydrated lime) with proper setting time can be made by mixing 5-15% of Alunite.抄録全体を表示PDF形式でダウンロード (353K) -
“F-座標” によるアパタイト特質の表示稲垣 誠二1964 年 1964 巻 70 号 p. 111-128
発行日: 1964/05/01
公開日: 2011/03/07
ジャーナル フリーNowadays, considering from the large domestic consumption of phosphate rocks, the rocks should be taken as an important resource of fluorine, as shown in Table 1 and 2.
The studies were carried out to find the chemical nature of fluorine in phoshate rocks. As the result, two natural routes of fluorination were found in the rocks ; the first, “igneous apatite type”, the second, “phosphorite type” as shown in Fig. 2.
Although the rocks of “phosphorite type” show wide range of fluorine content comparing with those of “igneous apatite type”, and almost all the phosphorise contain fluorine in excess as shown in Table 3-6, and Fig. 1, and 4. These can be explained by supposing the presence of apatite excess in fluorine, expressed as Ca10 (PO4) 6F3, or (F3).
Reasonably, (F3) may be also formulate structurally
H1+ [Ca10 (PO4) 6F2] F1-, and F/P2O5≅0.137. The formula shows excess in one molecule of fluorine comparing with normal fluorapatite Ca10 (PO4) 6 F2, or (F2), F/P2O5≅0.089.
From these analytical data or correlation between F and P2O5 values, “F-Co-ordinate” was thought to be of practical importance in the phosphate relating industries.
By plotting the wt. % of F, P2O5 on the Co-ordinate, as shown in Fig. 3, F/P2O5 value will be found, and mixcrystals of apatite under the circumstance may be also supposed.抄録全体を表示PDF形式でダウンロード (1855K) -
荒井 康夫, 永井 彰一郎1964 年 1964 巻 70 号 p. 129-133
発行日: 1964/05/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (669K)
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