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DURABILITY AND SERVICE LIFE PREDICTION MODEL FOR FREEZING AND THAWING CYCLE OF HIGH STRENGTH CONCRETE
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摘要: 在分析总结国内外高强混凝土抗冻性基本理论的基础上,结合试验结果对高强混凝土冻融循环寿命预测模型进行了比较研究,提出了基于冻融累积损伤的幂函数模型,认为冻融累积损伤的数学模型明显优于传统的动弹性模量衰减模型,同时应用累积损伤幂函数模型量化评估了非引气条件下掺加纳米粉体和缓凝剂对高强混凝土冻融循环使用寿命的影响。Abstract: Research work into freeze resista nce theory and service life prediction model for freezing and thawing cycle of h igh strength concrete are summarized and the corresponding research aimed to est ablish a new mathematics model of freeze-thaw durability for service life predi ct ion based on experimental results has been done.Two new mathematics models based on freeze-thaw cumulation damage theory are put forward and it is revealed tha t the new mathematical model especially the power function one is superior to th e traditional attenuation model of relative dynamic elasticity module of concret e in precision according to the freeze-thaw cycle test data.The quantitative an alysis on the influence of nano SiO-2(3%)and super retarder(0.3%)to service li fe of freeze-thaw cycle of high strength concrete is provided by using this mod el.
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