以导电率与活化能探讨混凝土的离子传输行为

Using electric conductivity and activation energy to study ion transport behavior of concrete

由目前常用的氯离子快速渗透试验(rapid chloride permeability test,RCPT)架构,配合Arrhenius方程式进行理论推导,寻找水泥质材料湿润饱和状态的导电率及活化能.并由此常数探讨水泥质材料的氯离子传输特性.采用4种不同水胶比(0.35,0.45,0.55及0.65)混凝土进行设计,并以水淬高炉矿渣粉与粉煤灰等辅助掺料取代水泥,由此研究适合的导电率与活化能关系式.试验结果表明,电导活化能与累积电量呈现负相关,电导活化能随着试体水胶比的增加而减少,但随着添加辅助掺料用量的增加而增加;在不同辅助掺料试体中,以粉煤灰的电导活化能最高,高炉矿渣粉次之.

The rapid chloride permeability test（RCPT） with Arrhenius equation is used to find cementitious material conductivity and the activation energy in order to discuss chloride ion transportation characters in concrete.For this study,concrete mixtures are in four different water-binder ratios（0.35,0.45,0.55 and 0.65）.Slag and fly ash are used to replace part of cement.Based on results of this study and theoretical analyses,the relationship between the conductivity and activation energy can be found.The activation energy is decreased with the increase of water-binder ratio,but increased with concrete mixtures containing mineral material.And using fly ash has more activation energy than using slag in auxiliary samples.