碳纤维增强水泥基复合材料的制备与性能研究  

Fabrication and Properties of Carbon Fiber Reinforced Cement Based Composite Material

作　　者：闫孝伟 YAN Xiaowei(Shandong Zhengheng New Material Technology Co.Ltd.,Jinan Shandong 250000,China)

机构地区：[1]山东正珩新材料科技有限责任公司,山东济南250000

出　　处：《铁道建筑技术》2022年第12期26-29,169,共5页Railway Construction Technology

基　　金：山东省第三批技术创新项目(201830701010)。

摘　　要：碳纤维增强水泥基复合材料具有力学性能好,兼具自感知和导电特性等,在智能混凝土领域展现出良好应用前景。本文采用压制成型技术制备碳纤维增强水泥基复合材料,系统研究成型压力、养护条件及碳纤维掺量等因素对碳纤维增强水泥基复合材料性能的影响。XRD测试结果表明,掺加碳纤维有利于C_(2)S水化,2 MPa成型压力制备的试样Ca(OH)_(2)峰强要高于10 MPa试样,而CS和CS峰强相对较弱。碳纤维增强水泥基复合材料主要孔径分布于3 nm~5μm之间,成型压力越大的试样大毛细孔和凝胶孔数量越少。成型压力2 MPa、10 MPa碳纤维增强水泥基复合材料渗滤阈值分别为0.6wt.%和0.4wt.%,当碳纤维掺量为0.6wt.%时,2 MPa成型压力制备的试块电阻率最小为73.2Ω·cm;10 MPa成型压力下试样抗压、抗折强度均显著大于2 MPa成型压力试样,且水养试样强度优于蒸养试样。Carbon fiber reinforced cement based composite material has both good mechanical properties and self-sensing and conductive performance, which shows good application prospects in smart concrete field. In this research, the carbon fiber reinforced cement based composites were fabricated by pressing method, and the effects of molding pressure, curing conditions and carbon fiber content on properties of the composites were studied. The XRD analysis showed that the increase of the carbon fiber content were benefit for the hydration of CS, the peak strength of Ca(OH)of the sample under 2 MPa was larger than that of the 10 MPa, however, the peak strengths of the CS and CS were relatively weak. The dominant pores of the composite distributed in 3 nm~5 μm, and the larger the pressure of the composite was, the less the macro pores and gel pores. The percolation thresholds of the composite under 2 MPa and 10 MPa were 0.6 wt.% and 0.4 wt.%, respectively. The resistivity of the composite under 2 MPa was the least when the carbon fiber content was 0.6 wt.%, which was 73.2 Ω·cm. The compressive strength and bending strength of the composite under 10 MPa were larger than that under 2 MPa, and the composite cured in water was better than that cured in the steam.

关 键 词：碳纤维 水泥基复合材料 电阻率 强度 孔隙率 试验 

分 类 号：TU528.582[建筑科学—建筑技术科学]