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Studies on Origin of Chlorides of RC Structures in Cold Region and Influence of Salts on Freeze-Thaw Resistance of Concrete

寒地RC结构氯化物来源及盐类对混凝土抗冻融性影响的研究

基本信息

批准号：
02650406
负责人：
TSUKINAGA Yoichi
金额：
$ 1.28万
依托单位：
Hachinohe Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650406/
关键词：
Deicing salt Studded tire Salt pollution Frost damage Composite action Scaling Migration of chloride

项目摘要

1. Actual Conditions for Application of Deicing SaltsActual conditions for application of deicing salts in the Tohoku district and Niigata prefecture were made clear, then of geographical distribution of spreading amount of deicing salts was drawn up.2. Influence of Deicing Salts(1) The relatively great amount of accumulation of chlorides was observed in concrete curbs collected from the inland of Aomori prefecture, possibly because of the penetration of deicing salts.(2) The geographical distribution and the seasonal change of the sedimented chloride amount were made clear. There existed artificially generated chlorides in some districts. The artificial chlorides was guessed mainly due to the spreading of deicing salts. Comparing the amounts of chlorides in the air monitored by deposit gauge method and gauze method regulated by JIS Z 2381, the different method gave the different amount in monitored chlorides and a little correlation between them was dound.3. Influence of Salts on the Freeze-Thaw Resistance(1) Quantitative evaluation Of surface scaling was possible by the measurement of weighl loss. The effects of chlorides such as deicing salts were serious on the scaling damage and tile degree of damages were different types of chlorides. ASTM C 672-84 method and RILEM tentative method were judged to give nearly the same estimation of the scaling resistance.(2) It was made clear that the chlorides existing in tile concrete moved and concentrated due to the freeze-thaw action.

1. 除冰盐应用的实际情况明确了东北地区和新泻县除冰盐应用的实际情况，绘制了除冰盐投放量的地理分布。除冰盐的影响(1)在青森县内陆收集的混凝土围护石中观察到相对大量的氯化物积累，可能是由于除冰盐的渗透。(2)明确了沉积物氯化物量的地理分布和季节变化。一些地区存在人工生成的氯化物。人工氯化物的产生主要是由于除冰盐的扩散。比较JIS Z 2381规定的沉积计法和纱布法监测的空气中氯化物的含量，不同的方法所测得的氯化物含量不同，两者之间的相关性很小。盐类对抗冻融性能的影响(1)通过测定失重量可以定量评价表面结垢。除冰盐等氯化物对结垢破坏的影响较大，不同类型氯化物对结垢破坏的程度不同。经判断，ASTM C 672-84方法和RILEM暂定方法对阻垢性的估计几乎相同。(2)明确了存在于瓦混凝土中的氯化物在冻融作用下的移动和集中。