巻号一覧
1964 巻 (1964)
- 73 号 p. 227-
- 72 号 p. 185-
- 71 号 p. 149-
- 70 号 p. 96-
- 69 号 p. 55-
- 68 号 p. 5-
前身誌
1964 巻, 72 号
選択された号の論文の6件中1～6を表示しています
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瀬戸山 克已, 後藤 克英, 関谷 道雄1964 年 1964 巻 72 号 p. 185-188
発行日: 1964/09/01
公開日: 2011/03/07
ジャーナル フリーCalcium sulfate low-hydrates show two exothermic peaks in DTA when they are added into water. The second peak is derived from the hydration of hemihydrate to dihydrate. The first peak for III-CaSO4. contains the heat of immediate hydration thereof to hemihydrate. The first evolution of heat for hemihydrate has not been clarified.
In this investigation, the modifications of calcium sulfate, portland cement, marble powder and various kinds of chemical reagents were added into solvent such as water and anhydrous ethyl alcohol and measured the heat change of the system by wet-process DTA apparatus with an aim to ascertain the cause of the first evolution of heat described above.
From the results of the coincidence of the peak value in DTA with already-known heat of solution for chemical reagents used, the first peak for calcium sulfate low-hydrate was considered to be derived from solution there of. This was reconfirmed by the phenomena in anhydrous ethyl alcohol. However, when CaSO4· 1/2 H2O was readded into water immediately after the first addition of it into water (that is, immediately after the saturation), a little amount of heat-evolution was still observed. It was concluded that the first evolution of heat which arises when CaSO4·1/2 H2O was added into water was heat of solution and moreover heat of wetting based on the surface activity.抄録全体を表示PDF形式でダウンロード (483K) -
青木 繁樹, 中原 万次郎1964 年 1964 巻 72 号 p. 189-193
発行日: 1964/09/01
公開日: 2011/03/07
ジャーナル フリーThe hydration of quick lime is retarded by the additon of several substances. Among the retarders gypsum has the characteristic effects on the hydration of quick lime. We measured the rates of hydration of quick limes containing gypsum or other substances and obtained following results.
1) The hydration of quick lime is little retarded by the addition of gypsum in early stages in it, but it becomes to be retarded as it proceeds and the temperature rises. The resulted slaked lime milk has very coarse particles.
2) It is retarded by the addition of glycerine in early stages in it, but it proceeds very fast when quick lime is hydrated a little.
3) It is retarded very much by the addition of gypsum and glycerine in all stages in it, but the resulted slaked lime milk is coarse.
4) It is little retarded by the addition of Portland cement clinker, but retarded by the addition of Portland cement clinker and gypsum.抄録全体を表示PDF形式でダウンロード (653K) -
村上 恵一, 田中 弘文, 赤塚 繁雄1964 年 1964 巻 72 号 p. 194-198
発行日: 1964/09/01
公開日: 2011/03/07
ジャーナル フリーThe properties of the hardened gypsum bodies mixed with urea-formalin resin and stylen-butadien copolymer were studied.
The resin containing plaster is hardened without heating in all treatment.
The intermediate polymerization solution of urea-formalin resin contains 50% net polymer, congruently mix with water and in tempering of plaster is used by replacing of same volume for a part of molding water.
In addition from three to ten percent for gypsum weight, no influence is observed on the setting time of plaster.
It was resulted that after three days tensile strength is same to without resin, after seven days less because of the slow rate of polymerization and after twenty-eight days approximatly equal.
The decreasing rate of drying is closely related to the change of tensil strength, and on addition of ten percent net polymer hardened bodies showed a relative large decreasing of the absorbed water as comparison with without resin.
The similar procedure is used in the case of stylen-butadien co-polymer emulsion.
When emulsion mixed with plaster, in order to keep its stabilities, nonionic surface active agents must sufficiently be added.
It was observed that a general properties of the latters is slightly below than the formers.
In both experiment, there are no considerable development, of the properties of the hardened gypsum bodies, but the significant reduction of the absorbed water would be a good improvement.抄録全体を表示PDF形式でダウンロード (514K) -
過剰石灰, SiO2およびR2O3の相互関係稲垣 誠二1964 年 1964 巻 72 号 p. 199-207
発行日: 1964/09/01
公開日: 2011/03/07
ジャーナル フリー1) Relationship among excess-lime, SiO2 and R2O3 (Fe2O3+Al2O3) which are regarded as main components of matrix in phosphorites was studied.
2) Considering from relative quantity of those components, phosphorites may be classified into three groups, namely Island phosphorites (Makatea and christmas type); continental phosphorites (Tennessee and Fiorida type); Continental phosphorite (Morocco type).
3) Each of those types of phosphate (phosphorites or apatites) appears to have specific correlation to some sedimentary roks :
Makatea type phosphate * … to coral leef limestone Florida type phosphato **…to phosphatic limestone etc.
Lao'cay type phosphate ***Tennessee type phosphate**} to phosphatic shale
Morocco type phosphate **…to phosphatic marl or mudstone
(* Island phosphorite, ** Continental phosphorite *** Metamorphosed apatite)抄録全体を表示PDF形式でダウンロード (945K) -
今野 正1964 年 1964 巻 72 号 p. 208-212
発行日: 1964/09/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (672K) -
1964 年 1964 巻 72 号 p. 212
発行日: 1964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 (88K)
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