基于炭纤维水泥基材料电阻率变化的水化进程监测

Monitoring of hydration using the electrical resistance of carbon fiber reinforced cement materials

研究了水化过程中空白水泥石与炭纤维水泥石的电阻特性,探讨了炭纤维水泥石的电阻率与其自身水化进程以及强度的关系,并对掺加早强剂和热养护炭纤维水泥石的电阻率与水化进程以及强度之间的关系进行了进一步的探讨。研究结果表明:水化过程中水泥石的极化作用较强,测试时不能获得稳定的电阻率,掺入质量分数0.30%以上的炭纤维后可以获得稳定的测试电阻。纤维掺量为0.35%的水泥石的电阻率与水化进程呈线性关系。掺加早强剂和热养护的炭纤维水泥石的电阻率与水化进程同样呈现线性关系。应用炭纤维水泥基材料电阻率对其自身水化进程的监测是可行的。

The electrical resistance of cement paste with and without carbon fibers during hydration was measured and the relationship between hydration and compressive strength and electrical resistance was investigated. The effect of adding an early-strengthening agent or heating was also studied. Results show that the electrical resistance of the cement paste fluctuates sharply during measurement because of strong polarization. The fluctuation of electrical resistance of the carbon fiber reinforced cement paste （CFRCP） disappears when more than mass fraction 0.30 % of carbon fibers is added, and the electrical resistance shows a linear relation to the extent of hydration when the carbon fiber mass fraction is 0.35 %. The same results are observed for CFRCP treated by the early-strengthening agent or heat curing. Therefore, it is feasible to monitoring the hydration of cement-based materials by testing its electrical resistance.