1.

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
2.

論文

論文
鳥居, 和之 ; Mak, S.L. ; Ho, D.W.S.
出版情報: 材料=Journal of the Society of Materials Science, Japan.  43  pp.95-100,  1994-01-15.  日本材料学会
URL: http://hdl.handle.net/2297/12301
概要: 金沢大学理工研究域環境デザイン学系<br />High strength concrete with the compressive strength in excess of 80 MPa has recently been a matter of concern in its application to the column or core wall of high-rise reinforced concrete building. High strength concrete can potentially generate high hydration temperature at early ages due to its relatively high cement conctent. It has been pointed out that a high temperature profile at early ages has a detrimental effect on the strength of high strength concrete, reducing long-term strength development and increasing thermal cracking risk. In this study, a temperature matched curing system(TMC) which can simulate in-situ temperature profiles of the column was developed in order to investigate the influence of high hydration temperature at early ages on the strength development of high strength concretes with and without silica fume. It was found that under sealed conditions, a high temperature of 70°C at early ages in high strength concretes with silica fume led to a little higher 7-day strength but no increase in strength beyond 28 days, whilst it had no significant detrimental effect on the strength development in those without silica fume. The evaporable and non-evaporable water content data showed that both the hydration of cement and the pozzolanic reaction of silica fume almost completed after 3 days TMC due to the shortage of water in concrete when high strength concretes with silica fume were subjected to a high temperature of 70°C at early ages. 続きを見る
3.

その他

その他
馬場崎, 亮一 ; 鳥居, 和之 ; 嘉門, 雅史 ; 青木, 正雄 ; 吉田, 信夫 ; Torii, Kazuyuki ; Kamon, Masashi ; Aoki, Masao ; Yoshida, Nobuo
出版情報: Soil mechanics and foundation engineering = 土と基礎.  36  pp.114-118,  1981-10-25.  The Japanese Geotechnical Society = 地盤工学会
URL: http://hdl.handle.net/2297/20629
概要: 金沢大学理工研究域環境デザイン学系
4.

論文

論文
鳥居, 和之 ; 杉山, 彰徳 ; 山戸, 博晃 ; 酒井, 賢太
出版情報: 材料=Journal of the Society of Materials Science, Japan.  55  pp.905-910,  2006-10-15.  日本材料学会
URL: http://hdl.handle.net/2297/12305
概要: 金沢大学理工研究域環境デザイン学系<br />In recycling the sand originally produced from glass waste as a fine aggregate for concrete mixture, their alkalisilica reactivity and alkali-leaching ability are very important from the view-points of the long-term stability of the recycled glass sand in concrete. In this study, the alkali-silica reactivity of four types of glass sands was comparatively investigated according to the chemical method, JIS A1145, and three types of mortar bar methods, JIS A1146, ASTM C1260 and Danish method. Also, the amounts of the alkali ions, Na^+ and K^+, released from the sand itself in the saturated calcium hydroxide solution at 38℃ was periodically measured. From the results of experiment, it was found out that the alkali-silica reactivity of recycled glass sands could not be properly determined by the chemical method because of relatively large amounts of alkali ions released from the sand itself during the test, and that the expansion behavior of mortar bars in accelerated curing conditions significantly changed depending on both the chemical compositions and the internal texture of glass sands used. Finally, the mitigation method of alkali-silica reaction by using fly ash or glass powder was discussed. 続きを見る
5.

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.  40  pp.1518-1524,  1991-12-15.  日本材料学会
URL: http://hdl.handle.net/2297/12307
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 p owdered 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
6.

論文

論文
稲松, 敏夫 ; 今越, 茂 ; 金田, 秋雄 ; 渡辺, 亮一 ; 鳥居, 和之 ; 山岸, 一隆
出版情報: Soil mechanics and foundation engineering = 土と基礎.  27  pp.11-16,  1979-12-25.  The Japanese Geotechnical Society = 地盤工学会
URL: http://hdl.handle.net/2297/20628
概要: 金沢大学理工研究域環境デザイン学系
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