巻号一覧
27 巻 (1987 - 1988)
- 4 号 p. 199-
- 3 号 p. 135-
- 2 号 p. 53-
- 1 号 p. 1-
27 巻, 3 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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前田 武久, 渡村 信治, 水田 博之, 芝崎 靖雄1987 年 27 巻 3 号 p. 135-146
発行日: 1987/09/05
公開日: 2011/09/20
ジャーナル フリーIn order to establish the means of quality evaluation for clay materials for ceramic industry, ignition loss (Ig) was determined with the elutriated fractions from several selected clays, and the values obtained were examined in relation to the specific surface area (S), thickness of the kaolinite crystal evaluated by X-ray peak broadness (t), X-ray peak intensity ratio [Hk/Hq=I (001 reflection of kaolinite)/I (101 reflection of quartz)], Pfefferkorn's plasticity index (PI) and characteristc value of plasticity (CV). The results obtained are summarized as follows:(1) A linear relation with negative slope between Ig and t and a hyperbolic relation between Ig and Hk/Hq were obtained.(2) Between Ig and S, a hyperbolic relation was obtained, too.(3) PI was proportional to Ig.(4) CV was nealy constant for all the fractions elutriated from the same clay material, regardless of the values of CV.(5) The use of these relations to control the quality of elutriated clays was proposed.抄録全体を表示PDF形式でダウンロード (1010K) -
交換性陽イオンの影響立松 英信, 水野 清1987 年 27 巻 3 号 p. 147-152
発行日: 1987/09/05
公開日: 2011/09/20
ジャーナル フリーThrough swelling and slaking properties, the soft rocks cause serious problems such as ground pressure and landslide particulaly in localities which lie on the Tertiary sedimentary rocks.
In order to understand the swelling behaviors of such soft rocks, an experiment was carried out to measure the swelling pressure of montmorillonite-pressed disks containing quartz powder in various proportions. The disks, termed “artificial mudstone” herein for convenience, were made in accordance with the procedure shown in Fig. 1, using montmorillonite saturated with Na or Ca. The swelling pressure was read using an apparatus shown in Fig.2, at various loading pressures.
The results are summarized as follows:(1) The maximum pressure was found to depend on the claycontents, the pressure of Na type being slightly higher than that of Ca type.(2) The maximum pressure decreased with increasing initial loading pressure, and this trend was more remarkable for Na type.抄録全体を表示PDF形式でダウンロード (600K) -
中井 信, 吉永 長則1987 年 27 巻 3 号 p. 153-161
発行日: 1987/09/05
公開日: 2011/09/20
ジャーナル フリーDissolution of various crystalline clay minerals and soil clays by hot acid oxalate treatment was assessed by the procedure of difference infrared absorption spectroscopy. The treatment dissolved lepidocrocite and vermiculite seriously, but partly hematite, goethite, kaolinite, halloysite (geological origin), montmorillonite and illite. Although halloysite from weathered pumice deposit may contain some amount of allophanic material, the difference infrared spectrum showed clearly the dissolution of a fair amount of the mineral. This specimen may be lower in “crystallinity” and, so, more susceptible to the treatment than that of geological origin. Relatively high value of weight loss for chlorite was ascribed to the dissolution of accessary minerals, such as vermiculite and halloysite. Severe dissolution of vermiculite may be due partly to that the mineral sample was tri-octahedral type.
The difference infrared spectrum of limestone-derived soil clay showed the dissolution of the crystalline components, such as vermiculite and halloysite. On the other hand, the ash-derived soil clays showed almost complete dissolution of allophane and imogolite which were present as the principal components.
All the above results point to that the acid oxalate treatment can never be selective for non and poorly crystalline clay materials, but dissolves the crystalline minerals considerably although the extent the dissolution depends on the kind or type of minerals. This should be taken into account particularly when the soil clays containing much crystalline minerals are examined by the selective dissolution technique with acid oxalate.抄録全体を表示PDF形式でダウンロード (734K) -
林 滋生, 岡田 清, 大津賀 望, 神山 宣彦, 小坂 丈予1987 年 27 巻 3 号 p. 162-169
発行日: 1987/09/05
公開日: 2011/09/20
ジャーナル フリーThe relation between iron content and morphology was examined for halloysite (10Å) particles from “Kanto Loam” by analytical transmission electron microscopy (AEM). The halloysite particles were spheroidal, short tubular, thin platy and crumpled lamellar, and their average iron content was 6.1 (σ=0.8), 5.3 (2.3), 6.1 (1.3) and 13.6 (2.1)%(by wt) as Fe2O3, respectively. The values were decreased down to 5.3 (0.9), 3.1 (0.8), 4.5 (1.3) and 7.4 (1.2)% by deironation treatment with hydrosulfite-sulfuric acid solution. The iron detected in these particles was considered to substitute the Al ion in the octahedral sheet because the SiO2/(Al2O3+Fe2O3) molar ratio was around 2.0, except for the crumpled lamellar particles whose value was around 2.3.抄録全体を表示PDF形式でダウンロード (3152K) -
森野 奎二, 柴田 国久, 岩月 栄治1987 年 27 巻 3 号 p. 170-179
発行日: 1987/09/05
公開日: 2011/09/20
ジャーナル フリーIn several regions in Japan, damage to concrete due to alkali-aggregate reaction has recently been discovered. The rock type of aggregates used in the damaged concrete structures was glassy orthopyroxene andesite in many cases. The alkali reactivity of the andesite depends on the amount of cristobalite, tridymite and volcanic glass contained. The volcanic glass is often altered to smectite and zeolites by the weathering.
In this paper, alkali reactivity of andesite samples collected from the Setouchi volcanic rock area is studied by the ASTM standard C289 test method for potential alkali reactivity (chemical method) and C227 test method for potential alkali reactivity of cement aggregate combination (mortar bar method). The behavior of reactive minerals and smectite was investigated by X-ray diffraction and polarizing microscopic observation. Special attention was paid to interpretation of the test results with regards to smectite in andesite.
The results obtained were summarized as follows:(1) The measured value of Rc (alkalinity reduction) increased with the content of smectite in the samples.(2) It was shown by X-ray diffraction that the 001 spacing of smectite contained in andesite shifted from 1.5nm to 1.26nm, and the diffraction intensity became lower after ASTM C289 chemical test. This fact is an evidence for that smectite takes part in the reduction in alkalinity.(3) The pessimum phenomenon was observed in the expansion test of mortar-bars made of the andesite aggregates. The magnitude of the expansion of mortar-bar made at a pessimum ratio was inversely correlated to the amount of smectite in andesite.抄録全体を表示PDF形式でダウンロード (3466K) -
伊藤 明男, 前田 義盛1987 年 27 巻 3 号 p. 180-189
発行日: 1987/09/05
公開日: 2011/09/20
ジャーナル フリーPDF形式でダウンロード (8495K)
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