国家自然科学基金资助项目(51208507，51378497);陕西省自然科学基金资助项目（2011gm6014）
采用经波形整形技术改进后的100分离式Hopkinson压杆试验装置，开展了碳纤维增强地聚物混凝土(carbon fiber reinforced geopolymeric concrete, CFRGC)的冲击压缩试验，基于峰值韧度和比能量吸收2种评价指标研究了CFRGC的冲击韧性，并进行了对比分析和机理探究.结果表明：从峰值韧度的评价指标来看，CFRGC在碳纤维体积分数为03%时能发挥出明显的冲击增韧优势；从比能量吸收的评价指标来看，CFRGC的增韧特性在碳纤维体积分数为02%和03%时相对较优异；2种表征冲击韧性的方法所反映的发展趋势存在一致性，一是冲击韧性指标存在明显的应变率效应，二是碳纤维对于地聚物混凝土而言具有一定的增韧效果；在评价碳纤维增强地聚物混凝土的冲击韧性时，采用比能量吸收指标更加有效、合理.
The impact compression test of CFRGC(carbon fiber reinforced geopolymeric concrete) was conducted by using 100 split Hopkinson pressure bar apparatus improved with the pulse shaped technique. The impact toughness of CFRGC was studied comparably from the view of two kinds of evaluation indexes, i.e. peak toughness and specific energy absorption(SEA). The results reveal that, from the point of peak toughness, CFRGC will show its advantages when volume fraction of carbon fiber is 03%; from the point of specific energy absorption, energy absorption character is excellent when volume fraction of carbon fiber is 02% and 03%. The development tendency reflected by two kinds of impact toughness evaluation indexes is in some consistency, in which the former is strain rate dependent, the latter is more effective and reasonable in evaluation of the impact toughness of CFRGC since carbon fiber can improve the impact toughness of geopolymeric concrete effectively.
朱靖塞,许金余,罗鑫,李为民,白二雷,高志刚.碳纤维增强地聚物混凝土韧性评价指标的对比研究[J].建筑材料学报,2014,17(2):303-308
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