Permit法研究氯离子渗透性及其与混凝土孔隙率的关系(英文)

应用渗透法(permeation migration,Permit)及快速氯离子迁移法(rapid chloride migration,RCM)研究了水胶比及粉煤灰掺量对混凝土抗氯离子渗透性的影响。通过对比试验,分析了Permit方法与RCM方法试验结果之间的相关性。采用可蒸发水含量法测试了混凝土相应的孔隙率,分析了Permit试验结果与混凝土孔隙率的关系。结果表明:Permit试验测定的混凝土氯离子渗透性指标与RCM试验结果及粗毛细孔孔隙率均具有良好的对应关系。由于是无损检测方法,用于现场测试Permit方法比RCM法更具优越性。

INVESTIGATION OF CHLORIDE ION PERMEABILITY BY PERMIT METHOD AND ITS CORRELATION WITH POROSITY OF CONCRETE

The effects of different water-binder ratios and fly ash on the chloride ion permeability of concrete were investigated by the Permit (permeation migration) and the RCM (rapid chloride migration) methods. The porosity of concrete was measured by an evaporative water method. It is revealed that there is a good relation between permeability index and porosity of large pores of con-crete. The relation between the results obtained by the Permit and the RCM methods was also found. The results show that the Permit method is a reliable approach for testing the chloride ion permeability. The Permit method as a non-destructive method in the field has a superior advantage over the RCM method.