Item type |
デフォルトアイテムタイプ(フル)(1) |
公開日 |
2010-08-04 |
タイトル |
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タイトル |
コンクリート中の塩分量分布とその移動に関する研究 その1 |
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言語 |
ja |
タイトル |
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タイトル |
Studies on Salt Content Distribution in Concrete and Its Transition with Time, 1 |
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言語 |
en |
作成者 |
具志, 幸昌
和仁屋, 晴讙
伊良波, 繁雄
Gushi, Yukimasa
Waniya, Haruyoshi
Iraha, Shigeo
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Salt Concentration Distribution |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Intrusion of salt |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Influence of W/C |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Effect of coating |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Evaporation |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Edge Effect |
内容記述 |
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内容記述タイプ |
Other |
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内容記述 |
Investigations have revealed that the damages due to corrosion of Re-bars in RC structures have been prevailing in Okinawa Prefecture and that the major cause of the damages is salt contained in concrete. There has been also disclosed that high values of salt concentration are found much frequently in concrete of RC structures mentioned above. The writers have started a series of experiments to disclose the causality between many causes and their effects on the above high values of salt concentration. The main one among the many causes is considered to be salt intrusion through concrete surface and water movement in concrete due to evaporation. Specimens were placed on some various places under different environments. One year has passed and the following results are obtained. 1. Specimens at coast have been intruded by a large amount of salt during one year period. The amount of 0.4 to 0.8 % salt by weight of mortar in concrete have been found. The effect of initial salt conent on salt concentration has been disappeared after one year. In some specimens at the point 500 m from coast, there have been also observed small increases of salt content in concrete. 2. The influence of W/C on salt concentration by penetration has been also founded in the specimens at coast. The smaller W/C is. the smaller quantities of salt are penetrated at the time one year has passed. The specimens at the point 500 m from coast have also shown the same tendency, but, only the specimen of W/C=70% has indicated a small increase in salt content. At coast, the differences among the quantities of intruded salt are relatively small and the quantities themselves are quite large. The structures at or near sea coast must be taken by some protective measures other than lowering W/C. 3. Coatings on concrete surfaces have some beneficial effects on salt penetration resistance, but there have been a large amount of penetrating salt in concrete of the specimens at coat. The lining of acril-gum coating material has been proved to have an excellent effect on preventing the intrusion of salt into concrete. 4. In all specimens, increases of salt concentration near the surfaces of concrete are observed at the biginning of this experiment. The movement of water toward surfaces in concrete specimens due to drying and evaporation is most responsible for this phenomenon. This phenomenon is termed "Edge effect". The salt concentration near surface amounts to 1.4 to 4 times the one of inside middle part of specimens. |
内容記述 |
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内容記述タイプ |
Other |
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内容記述 |
紀要論文 |
出版者 |
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言語 |
ja |
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出版者 |
琉球大学工学部 |
言語 |
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言語 |
jpn |
資源タイプ |
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資源タイプ |
departmental bulletin paper |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
識別子 |
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識別子 |
http://hdl.handle.net/20.500.12000/17687 |
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識別子タイプ |
HDL |
収録物識別子 |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0389-102X |
収録物識別子 |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AN0025048X |
収録物名 |
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言語 |
ja |
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収録物名 |
琉球大学工学部紀要 |
書誌情報 |
号 24,
p. 35-45,
発行日 1982-09
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