基于RSM的混凝土抗冻性研究

Study on freeze-thaw resistance of concrete based on RSM

采用RSM方法,利用Experiment-Designer 7.0统计软件,分析了含气量、水灰比对硬化混凝土气泡结构及抗冻性的影响。结果表明：在水灰比为0.4-0.5、含气量2.5%-4.5%范围内,含气量对混凝土的抗冻性影响显著,在三维响应面上表现为曲线较为陡峭,水灰比影响较弱,表现为曲线平缓。对混凝土抗冻耐久性具有决定性的影响是气泡间距系数,气泡间距越小,混凝土的抗冻性愈好。

The Experiment-Designer 7.0 software was used to analysis the influence of water-cement ratio （W/C）and air content on the freeze-thaw resistance and microstructure of concrete based on RSM.The experiment with fresh air contents ranging from 2.5 to 4.5 percent and W/C ranging from 0.4 to 0.5,the experimental data indicates that the fresh air content play more significant role on the freeze-thaw resistance com- pared with W/C,the cure on the three-dimensional response surface appear steep,the cure of W/C appear gentle.This difference in the freeze-thaw resistance performance seems to be much more related to the air void system than to the air content and W/C ratio,where the mix presents lower spacing factor,the better freeze-thaw resistance.