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

基本信息

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

项目摘要

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）在两个固化条件下从现有ASR钻出的混凝土核心的扩展行为，将获得的结果延伸到以下两个类别中。在含反应骨料的砂浆和孔隙溶液组成之间的扩展之间。泡沫器的结果总结如下；（1）在ASR中存在相对较大的氯化物。氯化物可能来自用作除法剂的NaCl。（2）通过丹麦方法在较短的时间内预测ASR影响的混凝土的残留膨胀，而不是通常的加速测试。与通常的加速测试相比，丹麦方法更明确地定义了剩余的膨胀。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的膨胀大约是通常加速的潮湿环境下相应迫击炮的两倍的大约两倍。测试。两者之间的相关性非常好。