| 摘要: |
| 采用3种粒径、5种掺量的橡胶粉制备橡胶混凝土，基于电液伺服万能压力试验机开展了橡胶混凝土（RPC）的准静态压缩试验，基于直径为74mm的分离式霍普金森压杆（SHPB）装置在4种加载波下开展了RPC的动态压缩试验，研究了应变率、橡胶粉粒径及掺量对混凝土静动力学性能的影响，由此对比分析了RPC的静动强度特性.结果表明：橡胶粉的加入使混凝上的抗压强度有所下降，并且随着橡胶粉目数的增大，抗压强度不断下降；橡胶混凝土的抗压强度均随橡胶粉掺量的增加而呈现下降趋势，在橡胶粉掺量为110kg/m3时下降幅度最大；橡胶混凝土的韧性增强，由脆性破坏转变成塑性破坏；橡胶混凝土表现出明显的应变率增强效应，即动态峰值应力和动态因数（DIF）随着动态应变率的增大而增大；橡胶混凝土的动态峰值应力及其增速均随着橡胶粉粒径的增大而增大，而且橡胶粉目数越大，动态因数越大；动态峰值应力随橡胶粉掺量的增加而减小，动态因数随着橡胶粉掺量的增加而增大. |
| 关键词: 静动压缩强度特性 橡胶混凝土 分离式霍普金森压杆 应变率增强效应 |
| DOI：103969/jissn1007 9629201406013 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51208507,51378497）;陕西省科技发展工业攻关项目（2014K10 15）;爆炸冲击防灾减灾国家重点实验室开放课题基金资助项目（DPMEIKF201406）；陕西省青年科技新星项目（2013KJXX 81） |
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| A Comparative Study of the Static and Dynamic Compression Strength of Rubber Powder Concrete |
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XU Jinyu1, LI Zancheng2, LUO Xin1, LENG Binglin3, LIU Zhiqun1
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1.Department of Airfield and Building Engineering, Air Force Engineering University, Xian 710038, China;2.College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xian 710072, China;3.Department of Airfield and Barrack, Guangzhou Military Region, Guangzhou 510000, China
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| Abstract: |
| Rubber powders of diameter of 380，180，120μm were mixed in 15,30,60,90,110kg/m3 to prepare rubber powder concrete（RPC）. A quasi static compression experiment has been carried out by electro hydraulic servo universal tester; the dynamic compression experiment of RPC by use of a split Hopkinson pressure bar（SHPB） of diameter of 74mm under loading with 4 different waves has been carried out; the influence of the diameter and mixing amount of rubber powder on the static and dynamic mechanical properties of concrete has been investigated and the static and dynamic strength of PRCC has been analyzed. The testing result shows that the involvement of RPC has decreased the pressure resisting properties of the concrete and with the increase of mesh of the rubber powder, the strength of RPS decreases continuously; the strength of concrete all decrease with the increase of mixing amount and the decrease scale reaches the highest value when the mixing amount is 110kg/m3; toughness of RPS has been strengthened and the damage form has shifted from fragile damage to that with certain plasticity; RPC has shown obvious strain rate strengthening effect, that is to say, the dynamic peak value stress also increases with the increase of strain rate and DIF increases with increase of strain rate; both the dynamic peak value stress of RPC and its increase speed increase with the increase of diameter of RPS and the greater the mesh of RPC, the greater the dynamic indicator：the dynamic peak stress decreases with the increase of mixing amount while its DIF increases with the increase of mixing amount. |
| Key words: static and dynamic compression strength rubber powder concrete（RPC） split Hopkinson pressure bar（SHPB） strain rate strengthen effect |
