早期受冻混凝土浆体孔隙结构试验研究

Experiment Study on Void Structure of Early Frozen Concrete

通过对不同受冻温度、受冻时长、起动时刻的早龄期受冻混凝土服役期的浆体孔径分布、孔隙结构参数的测试,探究这些环境参数对早期受冻混凝土浆体服役期孔隙结构的影响作用.结果表明:浆体孔径分布数量整体表现为过渡孔>大孔>毛细孔>凝胶孔,且大孔和凝胶孔对受冻环境的变化反应的较为敏感,表现为:随受冻温度下降、受冻时间增长、起冻时刻愈早,浆体大孔数量上升,凝胶孔数量下降,浆体总孔隙量、浆体孔隙率相应升高,而其他浆体孔隙结构参数对受冻条件变化反应不大明显.

The influence of environmental parameters on the void structure of early frozen concrete slurry during its service life was explored by testing the pore diameter distribution and void structure parameters of the slurry at different freezing temperatures,freezing duration and starting times.The results show that the pore size from large to small of the slurry follows the order of transition pore,macropores,capillary pores and gel pores.The macropores and gel pores are sensitive to the change of the frozen environment,and the increased freezing time results earlier freezing.With the number of large pores increases,the number of gel pores decreases,and the total pore volume of the slurry and the porosity of the slurry increase correspondingly,while other slurry respond to changes in pore structure parameters on cold condition.