※一部利用できない機能があります
| 1.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀 ; Torii, Kazuyuki ; Kawamura, Mitsunori
概要:
金沢大学理工研究域環境デザイン学系<br />Recently, chemical soil stabilization are actively adopted for the improvement of the soft ground
…
on which roads or buildings will be constructed. In addition to traditional stabilizers of Potland cement and lime, the industrial by-products such as fly ash and pulverized blastfurnace slag are also used for the purpose of increasing the effectiveness of cement and lime as a stabilizer and their effective utilization in soil stabilization. The objective of this study is to reval the mechanisms of strength development of the compacted stabilized soils from a microstructural view-point. The compressive strength, modulus of deformation and pulse velocity of various compacted soils stabilized with cement, lime and lime-fly ash (or pulverized blastfurnace slag) were measured. Their microstructures were also characterized by the SEM observation and pore size distributions obtained by the mercury intrusion porosimeter. The relationships between strength and changes in microstructure in compacted stabilized soils are discussed.
続きを見る
|
||||
| 2.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀 ; 枷場, 重正 ; 五十嵐, 心一 ; Torii, Kazuyuki ; Kawamura, Mitsunori ; Hasaba, Shigemasa ; Igarashi, Shinichi
概要:
金沢大学理工研究域環境デザイン学系<br />In the regions of the cold weather, the deterioration of the subbase in roads by freezing-thawing
…
action is often observed. Although the durability of stabilized soils is considered to be important, the evaluation of the resistibility of stabilized soils against freezing-thawing cycles has been little established in general. The purpose of this study is to evaluate the resistibility of the various stabilized soils against freezing-thawing cycles in terms of the compressive strength of the stabilized soils undergoing freezing-thawing cycles. The relationship between the resistibility against the freeezing-thawing cycles and the microstructure in the stabilized soils is discussed on the basis of the pore size distributions.
続きを見る
|
||||
| 3.
論文 |
論文
|
川村, 満紀 ; 岩堀, 和馬
|
||||
| 4.
論文 |
論文
|
川村, 満紀 ; 谷川, 伸 ; 古東, 秀文
|
||||
| 5.
論文 |
論文
|
川村, 満紀
|
||||
| 6.
論文 |
論文
|
川村, 満紀
|
||||
| 7.
論文 |
論文
|
川村, 満紀
|
||||
| 8.
論文 |
論文
|
川村, 満紀 ; 枷場, 重正
|
||||
| 9.
論文 |
論文
|
小森, 正樹 ; 中村, 嘉利 ; 沢田, 博志 ; 川村, 満紀
概要:
ヨシ水路による河北潟水の浄化について検討を行った。有機態炭素, 窒素, リンそれぞれについて懸濁態と溶存態に分画し, 溶存成分はさらにゲルクロマトグラフィーを用いて分子量別に分画して浄化の効果を調べた。全窒素, 全リン, BOD, CODに
…
ついては, 溶存態よりも懸濁態の方がヨシ水路によってより効率的に除去さることが明らかとなった。ゲルクロマトグラフィーによって分けられた3つの溶存有機物画分のうち, ヨシ水路の通過後, 最も分子量の小さい画分3のピークが減少したのに対して分子量最大の画分1のピークは増加した。ヨシ水路を用いた河北潟水の浄化後, 親水性成分の割合が増大した。これは疎水性成分の除去される割合が親水性成分よりも高いことを示唆する。The effect of reed bed system on the quality of Kahokugata lagoonal water was studied. The effects on water quality were examined by fractionation of dissolved organic carbon, nitrogen, and phosphorus using gel-chromatography. The suspended components of total nitrogen, total phosphorous, BOD, and COD were removed using reed bed system more efficiently than the soluble components of total nitrogen, total phosphorous, BOD, and COD. Based on UV220, UV260, TOC, T-N, and T-P three major fractions were identified by gel-chromatography of Kahokugata lagoonal water. Among them, the 3rd fraction (the lowest molecular weight) decreased after passing through the reed bed, while the 1st one with the highest molecular weight increased. The relative ratio of hydrophilic component increased after the purification of Kahokugata lagoonal water using reed bed system; this suggests that the removal ratio of hydrophobic component was higher than that of hydrophilic component.
続きを見る
|
||||
| 10.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀 ; 枷場, 重正
概要:
Recently, chemical soil stabilizations are actively adopted for the improvement of the soft ground on which the road and the foundation for offshore structures will be constructed. The industrial by-products such as gypsum, coal ashes,
…
blastfurnace slag and basic oxygen furnace slag can be used effectively for the soil stabilization. In this paper, the characteristics of soil stabilizations with various industrial by-products are discussed from the viewpoints of the types of reaction products which are responsible for the development of strength in the stabilized soils.
続きを見る
|
||||
| 11.
論文 |
論文
|
五十嵐, 心一 ; 川村, 満紀
|
||||
| 12.
論文 |
論文
|
五十嵐, 心一 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系
|
||||
| 13.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系<br />Recently, basic oxygen furnace slag produced by a new steel-making process is supplied as powdere
…
d particles containing a high content of free lime. When this slag is used as a material for the base course of road, its unfavorable self-deterious property may become an important problem. It is considered that the addition of granulated blastfurnace slag, which is a porous and stable material, to the powdered basic oxygen furnace slag can improve both the strength and durability of compacted mixtures. This paper deals with the effective utilization of powdered basic oxygen furnace slag and granulated blastfurnace slag in road construction. The suitability of compacted mixtures of two slags was investigated utilizing such characteristics as resistance to immersion in water, compressive strength and CBR value. Reaction products and microstructural features of the compacted slag mixtures were also elucidated by DSC-TG analysis, X-ray diffraction analysis and SEM observations. From the results, it was made clear that the addition of granulated blastfurnace slag increased the strength and reduced the expansion in immersion in water, and that the compacted slag mixtures fully satisfied the requirements of strength and durability for the base course of road.
続きを見る
|
||||
| 14.
論文 |
論文
|
橘, 吉宏 ; 梶川, 康男 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系<br />Kawamura, Mitsunori | 20019730
|
||||
| 15.
論文 |
論文
|
川村, 満紀 ; 鳥居, 和之 ; 竹本, 邦夫 ; 枷場, 重正
概要:
金沢大学理工研究域環境デザイン学系<br />he amount of waste concrete from demolished old buildings and pavements has increased in the last
…
10 years. This has brought about the disposal waste concrete problem in urban areas. Such waste concrete is hard to deal with properly and thus, it is important to recycle it as an aggregate for concrete from the view points of shortage of aggregate from river, energy and resouces saving as well as environmental preservation. The objective of this paper was to investigate the compressive, tensile and flexural strengths, drying shrinkage and durability against freezing and thawing cycles of the recycling concretes with the aggregates obtained by crushing old concrete buildings and concrete pavements. The main results obtained in this study are summarized as follows. (1) The physical properties of the aggregate produced from a concrete pavement are more favorable as an aggregate for concrete than those from a demolished concrete building. (2) The compressive, tensile and flexural strengths of the recycling concrete from a concrete pavement are greater than those of the recycling concrete from a concrete building. (3) The drying shrinkage of the recycling concrete is greater than the natural aggregate concrete. The recycling concrete made with the aggregate from a concrete building shows a greater shrinkage than that made with the aggregate from a concrete pavement. (4) The resistance of the recycling concrete from a concrete pavement against freezing and thawing cycles is better than that of the recycling concrete from a concrete building. The resistance of the recycling concrete made with a concrete pavement is increased by adding an AE admixture, being somewhat inferior to that of the natural aggregate concrete.
続きを見る
|
||||
| 16.
論文 |
論文
|
島居, 和之 ; 川村, 満紀 ; 枷場, 重正 ; 五十嵐, 心一
概要:
金沢大学理工研究域環境デザイン学系<br />Recently, the basic oxygen furnace slag produced in a new steel-making process aiming at energy a
…
nd resource saving is being as fine particles under 5 mm size because it breaks down itself due to its high content of f-CaO. In future, this type of basic oxygen furnace slag is anticipated to replace the conventional basic oxygen furnace slag. The objective of this study was to the applicability of this powdered basic oxygen furnace slag as a subbase material. Firstly, the changes in physical and chemical properties, the surface texture and the hydrated products of the basic oxygen furnace slag naturally weathered outdoors were determined by X-ray diffraction, differential thermal analysis (DTA) and SEM-EDXA analysis. Secondly, the strength test, the CBR test and the expansion test of the compacted basic oxygen furnace slag mixtures were carried out in order to clarify the strength characteristics of the powdered basic oxygen furnace slag as a subbase material and the effect of weathering outdoors on reducing its unfavorable self-deterious properties. The main results obtained are summarized as follows; (1) The major compounds of the powdered basic oxygen furnace slag were β-C_2S, C_2F, C_2S-C_3P, Wustite and a considerably large amount of f-Cao and Ca(OH)_2. (2) In the powdered basic oxygen furnace slag naturally weathered outdoors, the hydration of β-C_2S and f-Cao slowly progressed with age, resulting in the formation of C-S-H gel, Ca(OH)_2 and CaCO_3 on the surface of particles. (3) The powdered basic oxygen furnace slag became a stable material not showing self-deterious property by weathering outdoors for about three months, and thus it can be used as a subbase material.
続きを見る
|
||||
| 17.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系
|
||||
| 18.
論文 |
論文
|
久保, ホベルト洋 ; 五十嵐, 心一 ; 川村, 満紀
概要:
This paper investigated the volume changes of high strength mortars cured in water. The effects of characteristic microstructure on the volume stability were considered in relation to the formation of microcracks. The results indicated
…
that mortars without silica fume exhibited continuous swelling for long ages and the ones with silica fume shrank for a certain period after immersed in water, but started to swell at long ages. Cracking at long ages was confirmed for mortars with and without silica fume. However, there were distinct differences in the characteristics of crack pattern, such as the situation for cracking and their effects on the strength development between both. It was suggested that a mechanism other than autogenous shrinkage was involved in the volume changes that occurred in mortar with an extremely low water/binder ratio. Generation of internal expansive pressure due to the late cement hydration should be taken into account in the mechanism that cause microcracks in mortars at long ages.<br />Ex post facto report
続きを見る
|
||||
| 19.
論文 |
論文
|
五十嵐, 心一 ; 渡辺, 暁央 ; 川村, 満紀
概要:
The process of the formation of constituent phases in cement pastes with various water : cement ratios were quantitatively analyzed by the SEM-BSE image analysis. The proportions of each phase obtained by the analyses were compared
…
with those calculated based on Powers' model. It was found from the comparisons thatthe volume fractions of constituents obtained by the image analysis at a certain degree of hydration were consistent with those estimated from Powers' model. The gel-space ratios were also calculated based on the degree of hydration of cement obtained by the image analysis. The development of strength in cement pastes was reasonably explained by the gel-space ratio theory.<br />Ex post facto report
続きを見る
|
||||
| 20.
論文 |
論文
|
竹内, 勝信 ; 川村, 満紀 ; 鳥居, 和之
概要:
金沢大学理工研究域環境デザイン学系<br />Recently, a number of bridge concrete piers which appear to be damaged by the alkali-silica react
…
ion, have been found in a certain district in Japan. The major purpose of this study is to reveal whether the damage in the concrete piers was caused by an alkali-sicica reaction. Another important problem is to predict the residual expansion capacity of the affected concretes for the purpose of repairing them appropriately. The reactivity of aggregates used in the concretes was investigated by microscopic examination. In this district, a large amount of sodium chloride is being used as a deicing agent for many years. Accelerated expansion tests in saturated NaCl solution as well as in high humidity were carried out to predict the residual expansion of the actually damaged concrete piers. The correlation between the results obtained by the accelerated expansion tests in saturated NaCl solution and in high humidity was found to be considerably good. Andesitic and rhyolitic aggregates in the concretes were reacting..
続きを見る
|
||||
| 21.
論文 |
論文
|
枷場, 重正 ; 川村, 満紀 ; 鳥居, 和之 ; 高瀬, 博
概要:
金沢大学理工研究域環境デザイン学系
|
||||
| 22.
論文 |
論文
|
川村, 満紀 ; 竹内, 勝信 ; 杉山, 彰徳
概要:
金沢大学理工研究域環境デザイン学系<br />Kawamura, Mitsunori | 20019730
|
||||
| 23.
論文 |
論文
|
五十嵐, 心一 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系<br />Kawamura, Mitsunori | 20019730
|
||||
| 24.
その他 |
その他
|
鳥居, 和之 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系
|
||||
| 25.
論文 |
論文
|
川村, 満紀 ; 鳥居, 和之 ; 五十嵐, 心一 ; 藤井, 剛
概要:
金沢大学理工研究域環境デザイン学系<br />Chloride permeability of concrete is one of the mjor factors that influence the corrosion of stee
…
l reinforcement in concrete. It has been confirmed that the chloride pereability of cement paste and mortar varies widely depending on the water: cement ratio, type of cement, curing condition and so on. However, there are only a few reports concerning the chloride permeability of concrete. This study aims at revealing the effect of curing condition on the chloride permeability of concrete in which Portland cement was replaced in various amounts by flyash and blastfurnace slag. The chloride permeability of concrete was determined by the accelerate chloride permeability test using a diffusion cell similar to that described in Federal Highway Administration report (FHWA/RD-81/119). In order to relate the porosity or pore size distribution of concrete to it chloride permeability, the mercury intrusion porosimetry measurements were alo conducted. The experimental results showed that the chloride permeability of concrete containing flyash and blastfurnace slag was high when the concrete was exposed to a low humidity at the early stage of curing. It was also found that the chloride permeability of concrete increased proportionally with increasing volume of pores larger than 0.1μm in diameter.
続きを見る
|
||||
| 26.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀 ; 浅野, 篤郎 ; 三原, 守弘
概要:
金沢大学理工研究域環境デザイン学系<br />Condensed silica fume (CSF) is an ultra-fine and high reactive pozzolan. Some properties of fresh
…
and hardened concretes can be significantly improved by the use of CSF. CSF has been used in concrete to make a high-strength and durable concrete. This study aims at revealing the influence of CSF on the chloride permeability of concrete and the chloride corrosion of steel bars embedded in concrete. From the experimental results, it was confirmed that the use of small amounts of CSF could effectively reduce the chloride permeability of concrete and improve the protective function of concrete against the chloride corrosion of steel bars. With respect to the strength development of concrete and the protection against the chloride corrosion of steel bars in concrete, the most favorable replacement ratio of cement by silica fume was approximately 10%.
続きを見る
|
||||
| 27.
論文 |
論文
|
鳥居, 和之 ; 川村, 満紀
概要:
金沢大学理工研究域環境デザイン学系<br />Recently, chemical soil stabilization using the deep mixing method has been actively adopted for
…
the improvement of soft ground in the offshore regions. The objective of this study is to reveal the mechanism of strength development in the uncompacted stabilized soils made by the deep mixing method. The mechanical properties such as strength, modulus of deformation and pulse velocity of the soils stabilized by cement or lime-blast furnace slag were comparatively investigated. Furthermore, the reaction process and microstructure in them were elucidated by X-ray diffraction, SEM observation and the measurement of pore size distributions. From these results, the relationship between strength development and change in microstructure in the uncompacted stabilized soils was discussed.
続きを見る
|
||||
| 28.
その他 |
その他
|
Kawamura, Mitsunori ; Nakamoto, Yoshiaki ; 川村, 満紀 ; 中本, 義章
|
||||
| 29.
その他 |
その他
|
川村, 満紀 ; 中本, 義章 ; Kawamura, Mitsunori ; Nakamoto, Yoshiaki
|
||||
| 30.
論文 |
論文
|
川村, 満紀 ; 小泉, 徹 ; 枷場, 重正
|
||||
| 31.
論文 |
論文
|
川村, 満紀 ; 枷場, 重正 ; 小泉, 徹 ; 鳥居, 和之
|
||||
| 32.
論文 |
論文
|
枷場, 重正 ; 川村, 満紀 ; 小泉, 徹 ; 助田, 佐右衛門
|
||||
| 33.
論文 |
論文
|
枷場, 重正 ; 川村, 満紀 ; 小泉, 徹 ; 助田, 佐右衛門
|
||||
| 34.
論文 |
論文
|
枷場, 重正 ; 斉藤, 満 ; 川村, 満紀
|
||||
| 35.
論文 |
論文
|
川村, 満紀
概要:
金沢大学工学部<br />本研究において得られた成果は、鉱物混和材のASR抑制のメカニズム、ゲルの組成におけるCa(OH)_2の役割、リチウム塩の添加がゲルの組成に及ぼす影響および超高強度コンクリートにおけるASRの4つに分類できる。各テー
…
マにおいて解明された事項をまとめると以下のようである。(1)膨張を示さないフライアッシュモルタルにおいても、反応性骨材粒子内部にゲルが生成する。(2)高炉スラグ添加モルタルでは、細孔溶液のOH^-イオン濃度の低減は小さく、セメントペーストの緻密化による各種イオンや細孔溶液の移動度の低下によって、ASR膨張が抑制される。(3)シリカフユーム添加モルタルでは、細孔溶液のOH^-イオン濃度の低下が大きく、そのためにASR膨張が抑制される。(4)本実験において使用した焼成フリント骨材では、細孔溶液が、元々骨材粒子中に存在するひび割れに侵入し、ひび割れに沿うシリカ表面においてASRが進行する。(5)リチウム塩を添加したモルタルにいて、その添加量を増加させるとゲルの組成が均質なものになる。しかし、このことは、リチウム塩のASR抑制効果のメカニズムとは直接関係はないようである。(6)極端に低い水セメント比のモルタルにおいては、生成したゲルはゾル化した後、セメントペースト相に浸透することなく、ペースト中のひび割れ内部に滞留する。<br />The achievements obtained in this study are divided into the four themes of ASR suppression mechanisms of mineral admixtures, irples of Ca(OH)2 in ASR gel composition, effects of lithium salts on ASR gel compositions and ASR in ultra-high strength concrete. The items revealed in each theme are summarizedas follows ;(1) ASR gels were found to be produced even in fly ash-containing mortars showing no expansion.(2) Iri blastfurnaceTContaining jmprtars, reductions in/OH^- ion concentration are not so great, and the suppression of ASR expansion in the mortars is due to the reduction in the mobility of ions and pore solution through the cement paste phase.(3) In silica fume-containing mortars, the suppression of ASR expansion is, brought about by great reductions in OH^- ion concentration in, the pore solution.(4)The pore solution intnided into fissures in the cacined flint aggregate particles in mortars, and then ASR occurred along silica surfaces in the fissures.(5)The composition of ASR gels was homogenized by the addition of lithium salts. However, the homogenization in the ASR gels may not directly be related to the suppression of ASR.(6) In mortars with, an extremely low water : cement ratio, ASR gels produced within reactive aggregate particles could not permeate into the cement paste, and were accumulated in cracks within the cement paste.<br />研究課題/領域番号:10650449, 研究期間(年度):1998 – 2001<br />出典：「コンクリートにおけるアルカリシリカ反応生成物と骨材の適合性」研究成果報告書 課題番号10650449（KAKEN：科学研究費助成事業データベース（国立情報学研究所））（https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-10650449/）を加工して作成
続きを見る
|
