Fundamental Study on the Prediction of Residual Expansion of ASR Deteriorated Concrete

ASR劣化混凝土残余膨胀预测的基础研究

• 批准号: 06650497
• 负责人: KAWAMURA Mitsunori
• 金额: $ 1.34万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650497/
• 关键词: Alkali-Aggregate Reaction; NaCl; Residual Expansion; Accelerated Test; Pore Solution; Concrete Core; Alkali-Aggregate Reaction; NaCl; Residual Expansion; Accelerated Test; Pore Solution; Concrete Core

The results obtained are diveded into the following two category.(I) Expansion behavior of concrete cores drilled from the existing ASR deteriorated concrete structures under the two curing conditions and (II) Discussion on the significance of the accelerated testing from the viewpoint of the relation between the expansion of reactive aggregate-containing mortars and pore solution composition. The results of the foamier are summarized as follows ; (1) Relatively large amounts of chloride existed in the ASR deteriorated concrete structures. The chloride may come from NaCl used as a deicing agent.(2) The residual expansion of ASR affected concrete can be predicted during shorter periods by the Danish method than by the usual accelerated testing.(3) The discrimination between ASR affected concretes with and without residual expansiveness is more sharply defined by the Danish method than the usual accelerated testing. The results of the latter are summarized as follows ; (1) OH-ion concentration in the pore solution in mortars immersed in the saturated NaCl solution rapidly increased immediately after immersion. The maximum OH-ion concentration was proportional to the alkali content in the mortars.(2) Expansions of mortars containing reactive flint immersed in the saturated NaCl solution were as large as approximately twice those of the corresponding mortars under a moist environment in the usual accelerated testing. The correlation between both was very good.

（i）从现有的ASR下降的混凝土核心在两个固化条件下钻出的混凝土核心的扩展行为，并讨论（ii）讨论从现有ASR的混凝土结构钻探的膨胀行为，以及（ii）从加速测试的重要性的讨论中，从反应性聚集的粘贴砂浆和孔隙式溶液溶液的扩展之间的关系的意义上进行了讨论。泡沫器的结果总结如下； （1）在ASR中存在相对较大的氯化物。氯化物可能来自NaCl用作除法剂。（2）在较短的时期，可以通过丹麦方法预测ASR影响的混凝土的残留扩展，而不是通常的加速测试。后者的结果总结如下； （1）浸入饱和NaCl溶液中的砂浆中的孔隙溶液中的OH-ION浓度在浸入后立即迅速增加。最大OH-ION浓度与迫击炮中的碱含量成正比。（2）浸入饱和NaCl溶液中的反应性火石的迫击炮膨胀大约是通常加速测试中潮湿环境下相应迫击炮的两倍。两者之间的相关性非常好。