摘要
从宏观和微观两方面研究了Ｃ６０，Ｃ８０ ，Ｃ１００ 高强混凝土的抗冻性．宏观研究表明，Ｃ６０ 高强混凝土的抗冻性不能满足Ｆ３００ 的要求，而Ｃ６０ 引气高强混凝土的抗冻性能却很好，快冻可达Ｆ１２００ 以上．Ｃ８０ ，Ｃ１００ 高强混凝土具有非常高的抗冻性，快冻可达Ｆ１２００以上，但高强混凝土经过一定冻融循环后，抗折强度会出现明显的降低．微观研究表明，当高强混凝土的气泡平均半径小于０．０１ ｃｍ 左右时，混凝土将具有超抗冻的特性．Ｃ６０ 高强混凝土在冻融过程中微孔结构的破坏主要是毛细孔的破坏，而Ｃ８０，Ｃ１００ 高强混凝土在冻融过程中，可能是非常细的毛细孔和较大凝胶孔的破坏．
In this paper, frost resistance of high strength concrete of C60, C80 and C100 has been studied from both of macro and micro respects. The macro study results indicate that the frost resistance of the high strength concrete of C60 does not reach 300 cycles of freezing and thawing. But the frost resistance of the air entrained and high strength concrete of C60 is much better, and 1 200 freezing thawing cycles can be exceeded by rapid frosting method. The frost resistance of the high strength concrete of C80 and C100 is also so good that 1 200 freezing thawing cycles can be exceeded by rapid frosting method too. Meanwhile, after a certain freezing thawing cycles, the flexural strength of high strength concrete drops remarkably. The micro study results indicate that the high strength concrete has super high performance of frost resistance when its mean radius of air void is less than 0.01 cm. In the freeze thaw process, the destruction of micro void is mainly that of the capillary pores for the high strength concrete of C60, but may be that of the very small capillary pores and the bigger gel pores for the high strength concrete of C80 or C100.
出处
《建筑材料学报》
EI
CAS
CSCD
1999年第4期292-297,共6页
Journal of Building Materials
基金
国家"九五"重点攻关项目
关键词
高强混凝土
抗冻性
抗折强度
毛细孔
high strength concrete
frost resistance
flexural strength
capillary pores
gel pores
