【摘要】 为提高碳纤维在水泥基复合材料中的分散性,提出了两种改进的超声波辅助制备工艺——超声波分散纤维和超声波分散纤维加少量硅灰.应用电阻测试法评价了这两种工艺对碳纤维水泥浆的匀化效果,同时研究了超声波处理时间对复合材料匀化效果的影响.研究结果表明:由于超声波空化作用和机械作用可使纤维得到预分散,两种改进的超声波辅助制备工艺都可以提高碳纤维水泥基复合材料的均匀性;而且超声波处理时间越长,匀化效果越好,但达到一定时间后,匀化效果趋于饱和.更多还原

【Abstract】 In order to improve the dispersion of carbon fibers in cement-based composites,we propose two improved ultrasound-assisted dispersion technologies,in which only carbon fiber or both carbon fiber and a small quantity of silica fume in aqueous solution are sonicated with an ultrasonic generator.Their dispersion efficiency for carbon fiber in cement-based composites is evaluated with the mean value and the variation coefficient of resistivity,and the influence of ultrasound treatment time on the dispersion efficiency is explored.Experimental results indicate that the two improved ultrasound-assisted technologies can enhance the uniformity of carbon fiber in cement-based composites and their dispersion efficiency increases with the increasing ultrasound treatment time before the critical time.更多还原