摘要
进行了氯化钠与碱集料反应双重破坏因素作用下混凝土的膨胀试验 ,目的是研究有氯化钠存在时碱集料反应的规律。试验中采用了高低两种不同碱含量的混凝土 ,浸泡液用 1NNaCl、1NNaOH及其分别与3%和 7%的NaCl的复合 ,碱集料反应环境温度为 38℃。研究结果表明 ,不论何种复合 ,高碱含量混凝土的膨胀均比低碱含量的混凝土高 ;对于低碱含量混凝土 ,在早期 ,1NNaCl溶液对混凝土膨胀的值高于 1NNaOH溶液 ,NaOH与NaCl的复合会导致更低的膨胀值 ,但在后期 ,结果正好相反 ;对于高碱含量混凝土 ,则不论在早期还是后期 ,1NNaCl溶液对混凝土膨胀的值均低于 1NNaOH溶液 ,NaOH与NaCl的复合会导致更高的膨胀值。
Concrete expansion test was conducted under the actions of sodium chloride and alkali-aggregate reaction,whose aim was to study the rule of alkali-aggregate reaction in the presence of sodium chloride.The concretes with high and low alkali contents were used for the test.1N NaOH, 1N NaOH+3% NaCl and 1N NaOH+7% NaCl were all used as the soak, and the ambient temperature of the reaction was 38℃.The results show that under all soaks the expansions of the high-alkali concrete are higher than those of the low-alkali concrete.At the period of low-alkali concrete, the expansion by 1N NaCl soak is higher than that by 1N NaOH, and a further lower expansion can be produced by NaOH+NaCl soak, yet at the late stage the results are exactly opposite; whereas at the early and late stages of high-alkali concrete, the expansion by 1N NaCl soak is lower than that by 1N NaOH, a further higher expansion can be produced by NaOH+NaCl soak.
出处
《工业建筑》
CSCD
北大核心
2005年第2期77-80,共4页
Industrial Construction
基金
国家重点基础研究发展规划 (973 2项目 )资助 (编号 :2 0 0 1CB610 70 6)