【摘要】 碳纤维增强水泥基复合材料(CFRC)是新发展起来的一种功能材料,制备CFRC复合材料过程中,碳纤维在水泥基体中的分散性直接影响CFRC复合材料的力学性能。借助超声波和分散剂羟乙基纤维素(HEC),实现了短碳纤维在水泥基体中的均匀分散。对所制备的CFRC复合材料的断口形貌,作了SEM观察和能谱分析;测试了试件的抗压强度和抗折强度。结果发现,水灰质量比为0.44,碳纤维均匀分散,其质量掺量为0.6%时,复合材料的抗压强度可提高20%,抗折强度提高129%。更多还原

【Abstract】 Carbon-fiber-reinforced cement-based composites(CFRC) is a newly developed functional material.During the preparation process,the dispersion of carbon fibers in the cement matrix affects directly its mechanical properties.With the aids of ultrasonic wave and a new dispersant hydroxyethyl cellulose(HEC),the uniform dispersion of short carbon fibers in CFRC was realized.The SEM micrograph of the fracture surface of CFRC was observed and the correspondent energy dispersive spectroscopy(EDS) was analyzed.The compression strength and the flexural strength were measured.Results show that the compressive strength of CFRC increases by 20% and the flexural strength by 129% when the carbon fibers are well distributed in the cement matrix with the mass fraction of 0.6% and the water/cement mass ratio of 0.44.更多还原