港灣混凝土構造物鹼質與粒料反應檢測方法評估研究

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题名:	港灣混凝土構造物鹼質與粒料反應檢測方法評估研究
作者:	巫柏蕙;Po-huei Wu
贡献者:	土木工程研究所
关键词:	鹼質與粒料反應;檢測方法;醋酸鈾螢光法;雙染色法;alkali-aggregate reaction;detecting measurement
日期:	2001-06-20
上传时间:	2009-09-18 17:07:59 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究主要針對國內港灣結構物鹼質與粒料反應檢測方法進行手冊研擬。在新拌混凝土部分包括混凝土中粒料過去使用經驗的調查、粒料岩相的辨識、利用化學方法及水泥砂漿棒之膨脹量評估粒料反應活性、自然環境的調查等；硬固混凝土部分則包括現地目視調查、硬固混凝土岩相分析、鑽心試體加速浸泡試驗、X光繞射分析、SEM分析、醋酸鈾螢光法、雙染色法等，並將各項試驗結果與高雄港區及花東沿海地區之使用現況進行比對。研究結果顯示，高雄港區混凝土構造物之鹼質與粒料反應現象及潛勢相較於花東沿海地區為低。在相似溫濕環境及水泥含鹼量的情形下，其未有鹼質與粒料反應之原因應在於粒料反應活性較小及活性粒料含量較少。研究中所使用的各種檢測方法在一定範圍中皆有其適用性，惟基於鹼質與粒料反應的影響因素甚多，故混凝土構造物鹼質與粒料反應潛勢應視需要以多種方法加以檢測評估，無法僅以單一檢測方法判定。此外，以醋酸鈾螢光法搭配雙染色法，可檢測混凝土中是否有鹼質與粒料反應之反應產物存在，不僅迅速而且效果良好，實務上應可採用。 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.
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