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弯曲荷载、化学腐蚀和碳化作用及其复合对混凝土抗冻性的影响
作者:余红发 慕儒 孙伟 缪昌文 
单位:南京航空航天大学土木工程系 江苏省建筑科学研究院有限公司 东南大学材料科学与工程系 江苏省建筑科学研究院有限公司 南京210016东南大学材料科学与工程系 南京210096  南京210008  南京210096  南京210008 
关键词:混凝土  化学腐蚀  冻融循环  单一破坏因素  双重破坏因素  多重破坏因素 
分类号:TU528.0
出版年,卷(期):页码:2005,33(4):492-499
DOI:
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。
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Freezingthawing durability of concretes subjected to single damage factor (SDF), double damage factors (DDF) or multiple damage factors (MDF) was studied by accelerated freezingthawing 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 freezingthawing cycles, and SFSL under freezingthawing cycles. The DFSL under combined action of sulfate attack and freezingthawing cycles, the DFSL under combined action of salt lake bittern attack and freezingthawing cycles and the MFSL under the combined action of carbonization, salt lake bittern attack and freezingthawing cycles are all power functions of the SFSL under freezingthawing cycles. While in presentation of bending, both DFSL under flexural load and freezingthawing cycles, and MFSL under flexural load, deicing salt and freezingthawing cycles are decaying exponential functions of load.
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基金项目:
国家自然科学基金( 59938170; 50178044 );; “863”计划(2002AA335020)资助项目。
作者简介:
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参考文献:
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