Evaluation of Deterioration of Concrete Due to Alkali-Aggregate Reaction Based on Through-the-Thickness Elastic Waves
Evaluation of Deterioration of Concrete Due to Alkali-Aggregate Reaction Based on Through-the-Thickness Elastic Waves
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基于全厚度弹性波的混凝土碱骨料反应劣化评价
DOI：
10.1007/978-3-319-29052-2_24
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
K. Hirano
中科院分区：
文献类型：
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作者：
S. Uejima;T. Nishida;T. Shiotani;H. Asaue;T. Miyagawa;S. Furuno;K. Hirano
关于混凝土结构因碱-骨料反应（ASR）而劣化的报道很多。为了评估退化的进展情况，主要对结构进行目视检查。然而，这种目视检查无法检测混凝土结构的内部缺陷，因此有时检查结果会误导维护或资产管理。因此，应建立能够对内部损伤进行评估的评价方法。本文研究了用波速层析成像技术作为混凝土内部损伤的评价指标，并对实际混凝土桥墩进行了ASR损伤试验。基于速度分布即层析图像，可以可视化ASR对混凝土内部缺陷的影响。此外，也可以通过所得到的断层图像来评估恶化的进展。
There are many reports related to concrete structures deteriorated by alkali-aggregate reaction (ASR). In order to evaluate the progress of deterioration, a visual inspection of the structure has been principally carried out. However, this visual inspection cannot detect internal defects of the concrete structure, so that sometimes the results of inspection mislead maintenance or asset management. Therefore, the evaluation method which can assess the internal damage should be established. Authors have studied wave velocity tomography as indices to evaluate inside concrete damage.In this study, actual concrete bridge piers which have been damaged by ASR were experimented. Based on the velocity distribution namely tomogram, the internal defects of concrete affected by ASR could be visualized. Furthermore, the progress of deterioration could be evaluated by the resultant tomogram as well.