纤维早强混凝土不同龄期的动态力学性能

发布时间：2018-05-24 10:37

本文选题：早强混凝土 + 玄武岩纤维　；参考：《材料导报》2016年24期

【摘要】：早强混凝土在抢修、抢建及特殊工况中应用较广,其早期动态力学性能对其正常使用、安全评估等具有重要意义。制备了纤维体积掺量为0%、0.1%、0.2%和0.3%的玄武岩纤维早强混凝土,利用Φ100mm分离式霍普金森压杆(SHPB)装置对其1d、7d和28d的动力学性能展开研究。结果表明:玄武岩纤维早强混凝土动态力学性能具有显著的应变率强化效应,动态压缩强度和比能量吸收均随着应变的升高而显著增强;随着龄期的增加,早强混凝土的动态抗压强度和比能量吸收均增大,且均表现出前期增长迅速,后期增长缓慢的规律,在对比欧洲混凝土协会(CEB)等给出的应变率增长因子(DIF)计算公式后,提出了基于龄期增长的DIF计算模型;掺入玄武岩纤维对早强混凝土不同龄期的动态抗压强度和吸能性能均有不同程度的提升,纤维掺量越大,性能改善越明显。
[Abstract]:Early strength concrete is widely used in emergency repair, construction and special working conditions. Its early dynamic mechanical properties are of great significance to its normal use and safety evaluation. Basalt fiber early strength concrete with 0 ~ 0. 1% and 0. 3% fiber volume was prepared. The kinetic properties of basalt fiber early strength concrete were studied by using 桅 100mm split Hopkinson compression bar device for 1 d ~ 7 d and 28 d. The results show that the dynamic mechanical properties of basalt fiber early-strength concrete have obvious strain-rate strengthening effect, the dynamic compressive strength and specific energy absorption increase with the increase of strain, and increase with the increase of age. The dynamic compressive strength and specific energy absorption of early strength concrete both increase, and both show the law of rapid growth in the early stage and slow growth in the later period. After comparing the formula of strain rate growth factor (DIFs) given by the European concrete Association (CEB), etc., the dynamic compressive strength and the specific energy absorption of the early strength concrete are increased. The DIF calculation model based on age growth is put forward, and the dynamic compressive strength and energy absorption performance of early strength concrete at different ages are improved with the addition of basalt fiber, and the more the content of fiber is, the more obvious the performance improvement is.
【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;
【基金】：国家自然科学基金(51078350;51208507)
【分类号】：TU528

【相似文献】