高温作用下不同水灰比混凝土的抗冻融性能研究

采用快速冻融法,对经受不同高温、不同水灰比的混凝土进行了40次抗冻融循环.通过抗压强度试验测得混凝土的峰值应力、应变和弹性模量.探讨了不同高温作用和不同配合比对混凝土抗冻融性能的影响.研究分析表明:随高温作用温度的升高和水灰比的增大,混凝土的峰值应力逐步降低,弹性模量逐步减小.根据试验结果得出了混凝土冻融后弹性模量与高温作用温度的关系式.计算结论可为经受高温作用的混凝土抗冻融设计提供理论依据.

Research on mechanical properties of anti-freezing and thawing of concrete with different water-cement ratio under the effect of high temperature

By adoptting the quick freezing and thawing method,a series of experimental studies of concrete of different mix ratios subjected to different high temperatures through 40 freezing and thawing cycles have been conducted.Through compressive strength tests,concrete peak stress,strain and elastic modulus were measured.The paper discussed the influence of different high temperature and mixture ratio on the concrete freezing and thawing properties.The analysis showed that with the increment of temperature and water-cement ratio,the peak stress and elastic modulus of the concrete decreased gradually.According to the experimental result,the formula for elastic modulus after freezing and thawing and high temperature were developed.This study may provide a theoretical basis for the design of freeze-thaw resistance of concrete withstanded high temperature.