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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
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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.
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川村, 満紀 ; 枷場, 重正
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鳥居, 和之 ; 川村, 満紀 ; 枷場, 重正
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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,
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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.
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川村, 満紀 ; 鳥居, 和之 ; 竹本, 邦夫 ; 枷場, 重正
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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
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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.
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島居, 和之 ; 川村, 満紀 ; 枷場, 重正 ; 五十嵐, 心一
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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
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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.
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枷場, 重正 ; 川村, 満紀 ; 鳥居, 和之 ; 高瀬, 博
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金沢大学理工研究域環境デザイン学系
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川村, 満紀 ; 小泉, 徹 ; 枷場, 重正
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川村, 満紀 ; 枷場, 重正 ; 小泉, 徹 ; 鳥居, 和之
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枷場, 重正 ; 川村, 満紀 ; 小泉, 徹 ; 助田, 佐右衛門
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枷場, 重正 ; 川村, 満紀 ; 小泉, 徹 ; 助田, 佐右衛門
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