应用电阻率方法研究粉煤灰持碱效应

Influence of Fly Ash on the Alkaline Absorbing by Using Electrical Resistivity Method

采用无接触电阻测量方法,通过电阻率随水化时间的关系曲线,研究了粉煤灰水泥中加入NaOH和Na2SO4后净浆水化早期电阻率的变化规律。结果显示,加入粉煤灰后,使早期电阻率明显增加,后期电阻率降低。加入碱后,水化初期电阻率减低,后期电阻率增加。通过不同水化时间电阻率的变化曲线可以研究粉煤灰的持碱效应,并研究碱在粉煤灰水泥中的作用和形成的产物。

By using of non-contact electrical resistivity method and through the relation curves between electrical resistivity and hydration time, changing rule of early hydration time in fly ash cement of addition NaON and Na2 SO4 has been researched. Test results show that after adding the fly ash, in dissolving period the electrical resistivity obviously increased. And in the later period, the electrical resistivity decreased. When adding alkali-admixture, at early period of hydration the electrical resistivity decreases. And at later period, electrical resistivity is enhanced. Through the electrical resistivity curves of different hydration times, absorption effect of fly ash on alkaline can be studied. And the affection of alkali on fly ash and making hydration products can also be researched.