港灣混凝土構造物鹼質與粒料反應檢測方法評估研究

• Main Authors: Wu Po-huei, 巫柏蕙
• Other Authors: Lee Chau
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/67437188759656812158

碩士 === 國立中央大學 === 土木工程研究所 === 89 === This study is aimed at editing measurement manual of alkali-aggregate reaction for concrete structures in Taiwan. In fresh concrete, the field performance survey of concrete structures using the aggregate under investigation, petrographic examination, assessment of reactive activity for aggregates both by chemical analysis and by measuring expansion of mortar bars and the investigation of natural environmental condition that structures were exposed to were used. In hardened concrete, the visual investigation in situ, petrographic examination of hardened concrete, accelerated immersed test of core specimens, X-ray diffraction, SEM, uranyl acetate fluorescence method and dual staining method were used. The test results were compared with actual performance of concrete structures in Kaohsiung Harbor District and along the coastal areas in Hualien and Taitung. The test results show that the alkali-aggregate reaction and its potential of concrete structures in Kaohsiung Harbor District are lower than those of the coastal areas in Hualien and Taitung. The alkali-aggregate reaction depends on the reactivity and quantity of reactive aggregates for concrete structures on the similar environmental condition and alkali content of cement. All test measurements have somewhat their limits. Some measurements can only be applied within some definite ranges. The alkali—aggregate reaction was affected by many factors. So it is hard to tell the alkali-aggregate reaction of concrete structures using single measurement. In addition, Uranyl acetate fluorescence method and Dual staining method to investigate the reactive products of alkali-aggregate reaction are more beneficial than others and will be recommended to apply in practice.