1.

論文

論文
久保, ホベルト洋 ; 五十嵐, 心一 ; 川村, 満紀
出版情報: コンクリート工学論文集 = Concrete Research and Technology.  11  pp.71-76,  2000-01-01.  日本コンクリート工学会 = Japan Concrete Institute
URL: http://hdl.handle.net/2297/47031
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
2.

論文

論文
五十嵐, 心一 ; 渡辺, 暁央 ; 川村, 満紀
出版情報: コンクリート工学論文集 = Concrete Research and Technology.  14  pp.23-29,  2003-01-01.  日本コンクリート工学会 = Japan Concrete Institute
URL: http://hdl.handle.net/2297/47028
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
3.

論文

論文
竹内, 勝信 ; 川村, 満紀 ; 鳥居, 和之
出版情報: 材料=Journal of the Society of Materials Science, Japan.  43  pp.963-969,  1994-08-15.  日本材料学会
URL: http://hdl.handle.net/2297/12299
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 reaction, 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
4.

論文

論文
枷場, 重正 ; 川村, 満紀 ; 鳥居, 和之 ; 高瀬, 博
出版情報: Soil mechanics and foundation engineering = 土と基礎.  26  pp.11-16,  1978-05-25.  The Japanese Geotechnical Society = 地盤工学会
URL: http://hdl.handle.net/2297/20627
概要: 金沢大学理工研究域環境デザイン学系
5.

論文

論文
川村, 満紀 ; 竹内, 勝信 ; 杉山, 彰徳
出版情報: 土木学会論文集.  502  pp.93-102,  1994-11-01.  土木学会 = Japan Society of Civil Engineers
URL: http://hdl.handle.net/2297/24215
概要: 金沢大学理工研究域環境デザイン学系<br />Kawamura, Mitsunori | 20019730
6.

論文

論文
五十嵐, 心一 ; 川村, 満紀
出版情報: 土木学会論文集.  502  pp.83-92,  1994-11-01.  土木学会 = Japan Society of Civil Engineers
URL: http://hdl.handle.net/2297/24214
概要: 金沢大学理工研究域環境デザイン学系<br />Kawamura, Mitsunori | 20019730
7.

その他

その他
鳥居, 和之 ; 川村, 満紀
出版情報: 学術講演会前刷.  38  pp.149-151,  1989-05-23.  日本材料学会
URL: http://hdl.handle.net/2297/12298
概要: 金沢大学理工研究域環境デザイン学系
8.

論文

論文
川村, 満紀 ; 鳥居, 和之 ; 五十嵐, 心一 ; 藤井, 剛
出版情報: 材料=Journal of the Society of Materials Science, Japan.  38  pp.953-958,  1989-08-15.  日本材料学会
URL: http://hdl.handle.net/2297/12302
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 o f steel 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
9.

論文

論文
鳥居, 和之 ; 川村, 満紀 ; 浅野, 篤郎 ; 三原, 守弘
出版情報: 材料=Journal of the Society of Materials Science, Japan.  40  pp.1164-1170,  1991-09-15.  日本材料学会
URL: http://hdl.handle.net/2297/12300
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
10.

論文

論文
鳥居, 和之 ; 川村, 満紀
出版情報: 材料=Journal of the Society of Materials Science, Japan.  37  pp.1254-1259,  1981-11-15.  日本材料学会
URL: http://hdl.handle.net/2297/12303
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 adopte d 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