电化学改性CFPW对水泥基材料导电性能的影响

Effect of Electrochemically Modified CFPW on the Electrical Conductivity of Cement-based Materials

摘要:

本文对碳纤维预浸料废弃物(CFPW)进行电化学改性处理,研究了改性后CFPW性能变化以及对水泥基材料流动度、力学、导电性能的影响,并结合微观分析其导电机理。结果表明,对比60 mA,电流密度为80 mA时,CFPW表面树脂祛除效果最佳,纤维润湿性提高、表面粗糙度增加、石墨化程度增强,且密度上升并引入含氧官能团。改性CFPW掺入水泥基材料后,抗压强度和抗折强度最高增幅分别达31.05%和48.85%,水泥基材料的电阻率大幅降低,且随着养护龄期增加,效果愈发显著,在0.3%掺量时下降幅度高达57.94%。

Abstract:

In this paper, the carbon fiber prepreg waste (CFPW) was treated by electrochemical modification. The changes in the properties of the modified CFPW and its effects on the fluidity, mechanical properties, and electrical conductivity of cement-based materials were studied. Moreover, the electrical conduction mechanism was analyzed by combining microscopic analysis. The results show that, compared with a current density of 60 mA, when the current density is 80 mA, the resin removal effect on the surface of CFPW is the best. The wettability of the fibers is improved (the contact angle decreases to 54.8°), the surface roughness increases (Ra = 177 nm), the degree of graphitization is enhanced (ID/IG = 1.86), and the density increases while new functional groups are introduced. After the modified CFPW is incorporated into the cement-based materials, the maximum increases in the compressive strength and flexural strength can reach 31.05% and 48.85% respectively. The resistivity of the cement-based materials is significantly reduced, and with the increase of the curing age, the effect becomes more and more remarkable. When the dosage is 0.3%, the decrease can be as high as 57.94%.