巻号一覧
29 巻 (1989)
- 4 号 p. 151-
- 3 号 p. 107-
- 2 号 p. 55-
- 1 号 p. 1-
29 巻, 1 号
選択された号の論文の4件中1～4を表示しています
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喜田 大三1989 年 29 巻 1 号 p. 1-9
発行日: 1989/03/20
公開日: 2011/09/20
ジャーナル フリーThe method which constructs simplified diaphragm wall under ground using self-hardening bentonite slurry is applied freqently to the works of impervious earth retaining wall, water cut-off wall of underground dam, and so on. The slurry is made by mixing of 120 to 250 kg of cement and additives at need after mixing of 40 to 80 kg of bentonite per cubic meter of water. During the excavation of trenches the trenches are kept stable by the slurry. And, after the excavation, the slurry in the trench becomes hard gradually and forms the wall which keeps required strength and property of cat-off of water.
The viscosity of fresh self-hardening bentonite slurry is much influenced by the content of bentonite, and higher than that of ordinary bentonite slurry. The viscosity increases with aging time, and increases by intermixing of soil particles. In this method, the upper limits of the slurry viscosity are able to be set at higher than the ordinary diaphragm wall construction method. But, the slurry viscosity is too high, the excavation is difficult. The addition of retarder to the slurry on preperation is usually needed in order to keep the viscosity at suitable value. The densities of the slurry are 1.2 to 1.35 after intermixing of soil particles. The degree of bleeding of the slurry decreases with its viscosity. The cement which gives the highest strength is the mixture of blast-furnace slag powder and normal portland cement whose ratio is 80: 20 approximately.抄録全体を表示PDF形式でダウンロード (2041K) -
鈴木 哲也, Médard THIRY1989 年 29 巻 1 号 p. 10-18
発行日: 1989/03/20
公開日: 2011/09/20
ジャーナル フリーKaolinitic clays of the Paris Basin have been shown to develop by progressive conversion of smectite to kaolinite with a transitional development of interstratified kaolinite/smectite.
The proportions of kaolinite layers, ranging from about 4% to about 98%, have been determined by Reynolds' method and by a less rigorous procedure utilizing ideas of Mering. The chemical parameter which shows the most obvious correlation with layer proportions is the weight loss at 1000°C for samples dried at 110°C. A comparison of the mole ratio SiO2/(Al2O3+Fe2O3) shows that most samples seem to contain montmollironitic layers, but a few to contain beidellitic layers.抄録全体を表示PDF形式でダウンロード (2383K) -
上田 智, 西村 光弘, 小泉 光恵1989 年 29 巻 1 号 p. 19-28
発行日: 1989/03/20
公開日: 2011/09/20
ジャーナル フリーErionite-offretite (EO) type zeolite was synthesized at 100°C from nearly clear solutions and hydrogels in the system Na2O-K2O-TMA2O-Al2O3-SiO2-H2O. It was identified by X-ray diffractometry, electron diffractometry, SEM, TG-DTA and chemical analysis, and further its catalytic properties over the H form in the conversion reaction of methanol to hydrocarbons was cheked.
The SiO2/Al2O3 molar ratio (R value) of the aluminosilicate framework enhanced with increasing R value of the reactant mixture. Electron diffraction patterns of the EO type zeolite showed diffuse odd-l spots with streaks parallel to c* indicating disorder of the structure. This indicates the presence of lamellae with ordered domains of erionite in offretite matrix. With the increase of the R value, the diffuse odd-e spots had a tendency to become strong in intensity and to be elongated in streak. However, the EO type zeolite formed in a high alumina region gave weak intellsities of the odd-l spots despite the high R value of the framework.
Catalytic activities in the methanol conversion over the H form catalysts varied with difference of the R values. The catalysts having relatively low or high R value tended to show lower activities than the catalysts having the intermediate R values, with a few exception. The catalysts with the intermediate R values were apt to show high selectivities to light olefins, compared with the other catalysts.
In view of these results, it would be preferable that the EO type zeolite in our reaction system is classified as follows: Disordered type I zeolite, ZSM-34, and Disordered type II zeolite. In this order, the intensities of the odd-l spots tended to increase.抄録全体を表示PDF形式でダウンロード (3238K) -
活性化への道佐藤 満雄, 井上 克弘, 山中 昭司, 芝崎 靖雄, 青柳 宏一, 鈴木 啓三, 久保 博, 黒田 一幸1989 年 29 巻 1 号 p. 29-41
発行日: 1989/03/20
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (2859K)
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