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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.

所得结果可分为以下两类。(I)膨胀行为的混凝土芯钻从现有的ASR恶化混凝土结构在两种养护条件下和（II）讨论的意义，加速测试的观点之间的关系的反应性骨料的砂浆和孔溶液组成的膨胀。研究结果表明：（1）在ASR劣化混凝土结构中，氯离子的含量相对较高。氯化物可来自用作除冰剂的NaCl。(2)受ASR影响的混凝土的残余膨胀，可以预测在较短的时间内由丹麦的方法比通常的加速试验。(3)与通常的加速试验相比，丹麦方法对ASR影响的混凝土（有和无残余膨胀性）之间的区分更为明确。后者的结果总结如下：（1）浸泡在饱和NaCl溶液中的砂浆孔溶液中的OH-离子浓度迅速增加后立即浸泡。最大OH-离子浓度与砂浆中的碱含量成正比。(2)膨胀的砂浆含有活性燧石浸泡在饱和NaCl溶液中的大到大约两倍的相应的砂浆在潮湿的环境下，在通常的加速测试。两者之间的相关性非常好。