回收CFRP增强水泥的导电性能研究

Electrical conductivity of cement reinforced with recycled CFRP

碳纤维增强复合材料(Carbon Fibre-Reinforced Polymer,简称“CFRP”)作为一种高性能材料,在多个领域中得到了广泛的应用,但由于CFRP在生产过程中会产生大量废弃边角料,这部分废弃物若不妥善处理会带来严重的环境问题,也会造成资源浪费。本文将CFRP加工成型过程中的边角料废弃物进行处理后掺入水泥中,研究回收CFRP边角料对水泥力学性能和导电性能的影响。结果显示:合适的掺量会增强水泥的抗压和抗折性能;当回收CFRP在水泥中的掺量不高时,水泥电阻率的降低效果并不明显;当回收CFRP在水泥中的掺量达到4%时,水泥基材料电阻率急剧下降;当回收CFRP在水泥中的掺量继续增加时,水泥内部由回收CFRP中的碳纤维形成了一个搭接式的导电通路机制,电阻率已降低到最小且不随着龄期发生明显变化。研究还表明水泥电阻率随着水泥试块龄期的增长而升高,并且在干燥过程中水泥电阻率随着含水率的减少先升高再降低。当前的研究不单单可以解决CFRP浪费的问题,同样可以大大地缓解CFRP废弃物给人类带来的环境压力。

As high-performance materials,Carbon Fiber-Reinforced Polymer(CFRP)has been widely used in many fields.However,due to the large amount of FRP scraps generated during the production of CFRP,this may bring serious environmental problems,and also cause a waste of resources.In this paper,the CFRP scraps generated during production was treated and added into cement,and the effect of recycled CFRP waste on the mechanical properties and electrical conductivity of cement was studied.The results show that proper amount of recycled CFRP can enhance the compressive and flexural properties of cement.When the amount of recycled CFRP in cement is not high,the reduction in electric resistance of cement is not remarkable.When the amount of recycled CFRP in cement reaches 4%,the electric resistance of cement-based materials decreases sharply.When the amount of recycled CFRP in cement continues to increase,a conductive path mechanism is formed in cement by the carbon fiber in recycled CFRP,and the electric resistance has been reduced to a minimum value and does not change significantly with the age.The study also shows that the electric resistance of cement increases with the increase of the age for cement specimens,and it increases first and then decreases with the decrease of water content in the drying process.Current research can not only help to solve the problem caused by the CFRP waste,but also to greatly relieve the environmental pressure brought by CFRP waste.