A Concrete Frost Evaluation Method Considering the Moisture Increment in the Accelerated Freeze-thaw Test
In the accelerated freeze-thaw test, the trend of the relative dynamic modulus of elasticity has been studied and the nick point where the relative dynamic modulus of elasticity decreases dramatically has also been picked out in order to compare with the critical moisture degree in the critical degree of saturation test.According to the results, the mass moisture content of the nick point almost equals to that of the critical moisture degree.Moreover, once the mass moisture content of the concrete is surpassed, the relative dynamic modulus of elasticity will decrease dramatically and concrete will be damaged by the freeze-thaw test quickly.Therefore, the freeze-thaw cycle (Nf) at the nick point in the accelerated freeze-thaw test is regarded as a new concrete frost resistance evaluation criterion.In addition, the effect of different drying conditions on the frost resistance has also been studied.The change of the frost resistance by drying cannot be evaluated by the parameter Scr or the gradient of Scap calculated, while the change could be evaluated the the DF and Nf in the accelerated freeze-thaw test.Besides, the concrete frost resistance calculated by the DF is agreement with Nf.
mass moisture content the relative dynamic modulus of elasticity the critical degree of saturation freeze-thaw
Dequn Ma Tomoko Fukuyama Osamu Senbu
Hokkaido University, Sapporo, Japan Ritsumeikan University, Kyoto, Japan
国际会议
福州
英文
641-648
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）