碳纤维混凝土导电压敏性的研究

Study on Pressure Sensitivity of Crabon Fiber Reinforced Concrete

碳纤维水泥基材料具有应力、应变自感知功能,所以可以利用碳纤维混凝土的这种性能制备碳纤维混凝土压敏传感器。本文主要研究用于融雪化冰的碳纤维混凝土的制作工艺;碳纤维混凝土最佳配合比;探讨碳纤维混凝土电阻随碳纤维掺量的变化规律以及混凝土的压敏性。研究结果表明:碳纤维混凝土的电阻随龄期增长而下降,21d后趋于稳定;碳纤维混凝土电阻随碳纤维掺量增加而下降,当碳纤维掺量达0.7%时碳纤维混凝土的电阻迅速下降,此后碳纤维混凝土的电阻随碳纤维掺量增加无显著降低;通过碳纤维混凝土压敏性研究可以测知碳纤维混凝土随压应力增加其内部裂纹的闭合及新裂纹的产生。

Carbon fiber reinforced cementitious composites has self sensing ability to stress and strain. Therefore, it can be used to make pressure sensitivity sensor. In this paper, the fabrication process and the optimal mix proportion of carbon fiber concrete is mainly studied. And the influence of carbon fiber dosage on the resistance and pressure sensitivity of concrete is discussed. The re- sults indicate that resistance of carbon fiber concrete decrease with its curing age prolonging until 21 days later. The increasement of fiber dosage will lead to the decrease of concrete resistance. Before the fiber dosage reaches to 0.7%, concrete resistance drops rapidly, and then changes little. By the pressure sensitivity of carbon fiber reinforced concrete, closing and forming of cracks with the increasing of stress can be predicted.