摘要
用快冻法研究了混凝土在单一破坏因素(single damage factor, SDF)、双重破坏因素(double damage factors, DDF)和多重破坏因素(multiple damage factors,MDF)作用下的冻融寿命。探讨了混凝土在冻融条件下的双因素寿命(double factor service life,DFSL),多因素寿命(multiple factor service life,MFSL)与单因素寿命(single factor service life,SFSL)之间的关系。结果表明:混凝土在(冻融+除冰盐腐蚀)DDF作用下的冻融DFSL与冻融SFSL之间呈线性关系;在(冻融+硫酸盐腐蚀)DDF和(冻融+盐湖卤水腐蚀)DDF作用下的冻融DFSL,以及在(碳化+冻融+盐湖卤水腐蚀)MDF作用下的冻融MFSL均与冻融SFSL之间呈幂函数关系。混凝土在(弯曲荷载+冻融)DDF或(弯曲荷载+冻融+除冰盐腐蚀)MDF作用下的冻融DFSL和MFSL随着弯曲荷载比的增加而呈现指数下降的规律。
Freezing-thawing durability of concretes subjected to single damage factor (SDF), double damage factors (DDF) or multiple damage factors (MDF) was studied by accelerated freezing-thawing test. Dependence of multiple-factor service life (MFSL) and double-factor service life (DFSL) on single-factor service life (SFSL) was investigated. Results show a linear relationship between the DFSL, under combined action of deicing salt and freezing-thawing cycles, and SFSL under freezing-thawing cycles. The DFSL under combined action of sulfate attack and freezing-thawing cycles, the DFSL under combined action of salt lake bittern attack and freezing-thawing cycles and the MFSL under the combined action of carbonization, salt lake bittern attack and freezing-thawing cycles are all power functions of the SFSL under freezing-thawing cycles. While in presentation of bending, both DFSL under flexural load and freezing-thawing cycles, and MFSL under flexural load, deicing salt and freezing-thawing cycles are decaying exponential functions of load.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2005年第4期492-499,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金( 59938170
50178044 )
"863"计划(2002AA335020)资助项目。
关键词
混凝土
化学腐蚀方法
抗冻性
使用寿命
膨胀剂
Carbonation
Chemical attack
Durability
Freezing
Loads (forces)
Thawing
