碳纤维增强地聚物混凝土韧性评价指标的对比研究

发布时间：2018-04-10 11:55

本文选题：碳纤维增强地聚物混凝土 + 韧性评价指标　；参考：《建筑材料学报》2014年02期

【摘要】：采用经波形整形技术改进后的鐖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0.3%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0.2%和0.3%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.
[Abstract]:The impact compression test of carbon fiber reinforced geopolymeric reinforced concrete (CFRGCs) of carbon fiber reinforced geopolymer concrete (CFRGCs) was carried out by means of a separate Hopkinson compression bar test device improved by waveform shaping technique.The impact toughness of CFRGC was studied based on the two evaluation indexes of peak toughness and specific energy absorption.The results show that CFRGC can play an obvious impact toughening advantage when the volume fraction of carbon fiber is 0.3 from the evaluation index of peak toughness.According to the evaluation index of specific energy absorption, the toughening characteristics of CFRGC are consistent with each other when the volume fraction of carbon fiber is 0.2% and 0.3% respectively.One is that the impact toughness index has obvious strain rate effect, the other is that carbon fiber has a certain toughening effect on polymer concrete, and when evaluating the impact toughness of carbon fiber reinforced geopolymer concrete,It is more effective and reasonable than the energy absorption index.
【作者单位】：空军工程大学机场建筑工程系;西北工业大学力学与土木建筑学院;广州军区空军后勤部机场处;
【基金】：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)
【分类号】：TU528.572

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