摘要
研究了NaCl浓度对混凝土内部毛细管吸水饱水度、溶液结冰膨胀率和结冰压的影响，继而对混凝土盐冻破坏机理进行了分析.结果表明，随着NaCl浓度的增加，溶液结冰膨胀率和结冰压显著降低，这是最有利于降低混凝土盐冻破坏的因素；另一方面，混凝土内部毛细管吸水饱水度和吸水速度随NaCl浓度的增加而显著提高，这是最不利于降低混凝土盐冻破坏的因素.基于这些实测数据，经计算证明了浓度为2%-6%（质量分数）的NaCl溶液将产生最大的结冰压，从而形成最严重的混凝土盐冻破坏.
Effects of NaCl concentration on capillary-uptake degree of saturation in concrete, iceformation pressure and volume expansion of solutions were investigated, and then mechanisms of the deicer-frost scaling of concrete was analyzed. Results show that the ice-formation pressure and volume expansion of solutions are significantly reduced with the increase of NaCl concentration, which are the most positive effects on reducing the deicer-frost scaling of concrete. On the other hand, the capillary-uptake degree of saturation and water-uptake rate in concrete increase notably, which are the most negative effects on reducing the deicer-frost scaling of concrete. Based on these measured data, the ice-formation pressure in concrete was calculated, and it is proved that the ice-formation pressure generated by 2% - 6 %（by mass） NaCl solution is maximum, i.e. it causes the most severe damage of concrete.
出处
《建筑材料学报》
EI
CAS
CSCD
2007年第5期522-527,共6页
Journal of Building Materials
关键词
混凝土
盐冻破坏机理
结冰压
膨胀率
饱水度
concrete
deicer-frost mechanism
ice-formation pressure
volume expansion
degree of saturation
