【摘要】 研究了不同粉煤灰掺量、冻融方式和混凝土组成材料的变化对混凝土在冻融循环中损伤程度的影响 ,证明了C3 0 ,C50掺粉煤灰混凝土的冻融破坏机理主要是结冰压力破坏 ,从而为粉煤灰混凝土抗冻性和耐久性的改善措施提供了依据 .更多还原

【Abstract】 There is some disagreement on the mechanism and test results of concrete resistance to freeze/thaw action. The factors influencing damage of concrete were tested with different fly ash dosages, manner of freeze/thaw action and constitution of concrete. The results show that the mechanism of failure of concrete with strength grade 50 MPa under freeze/thaw cycle is mainly icing pressure. The research conclusions can be used as a base in designing of concrete with fly ash used in some important concrete engineering like Nanjing Second Yangtze River Bridge.更多还原