肖前慧，  牛荻涛，  朱文凭
    （西安建筑科技大学，西安710055）

[摘要] 通过快速冻融的方法，对在水中经过300次冻融循环的混凝土试件进行了试验研究，测定了其在不同循环次数时的立方体抗压强度。通过对试验结果的分析，提出了有关在冻融环境下混凝土水胶比、粉煤灰掺量和引气剂掺量选择的建议；并建立了考虑水胶比、粉煤灰掺量、引气剂掺量等因素的冻融循环下混凝土抗压强度指数衰减规律预测模型和寿命预测模型，这些模型为混凝土在冻融环境下耐久性寿命预测提供了依据，也为有抗冻要求混凝土结构的进一步研究提供了试验依据和参考。
[关键词] 混凝土；冻融环境；耐久寿命；预测模型
中图分类号：TU528    文献标识码：A  文章编号：1002-848X(2011) S2-0203-05

    Strength degradation model and durability service life prediction of concrete in freezing-thawing circumstance
    Xiao Qianhui, Niu Ditao, Zhu Wenping
    ( Xi' an University of Arclutecture and Technology,  Xi' an 710055,  China)

Abstract: The experimental study on concrete specimens suffering 300 cycles of freezing and thawing was carried out. The compressive strength of concrete was measured, and suggestions of selecting the water-cement ratio, the air-entraining agents and the fly ash contents of concrete were introduced.  The testing results were discussed and the prediction model of freezing and thawing cycles of concrete was built, considering the water-cement ratio, the fly ash contents and the air-entraining agents, which choose the compressive strength as the evaluation index. The prediction model can provide the testing and theoretic basis for the prediction of durability service life of common concrete in freezing-thawing circumstance and the deeper study of the concrete construction in freezing-thawing circumstance.
Keywords: concrete; freezing-thawing circumstance; durable life; prediction model