自然养护RPC爆炸破坏形态的试验研究
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摘要
针对活性粉末混凝土(RPC)高温蒸养的弊端,提出自然养护RPC的制备技术。自然养护的RPC是以高强度等级水泥、高强掺合料、钢纤维等为原材料,采用常温标准养护制备而成的一种超高强混凝土材料。本文对钢纤维体积率0和2%的自然养护RPCV0和RPCV2板分别进行爆炸和相关力学性能的测试,并对自然养护RPC板的爆炸破坏形态进行阐述。测试结果表明,掺加钢纤维利于RPC抗压和劈裂抗拉强度的增加;在相同装药量引爆时,RPCV2板背爆面的加速度峰值显著低于RPCV0板,RPCV2板未形成贯穿孔,仅在迎爆面和背爆面中心部位出现爆坑,裂缝少而细,RPCV0板呈崩溃式破坏形态,裂缝多而粗。由此表明,RPCV2板表现出的优异抗爆、抗震塌性能,是由于钢纤维增强了RPC基体的塑性变形能力。
In view of the disadvantages of high temperature steaming for reactive powder concrete(RPC),the preparation technology of natural curing RPC is put forward in this paper.Natural curing RPC is a super strength concrete material prepared from high strength grade cement,high strength admixture and steel fiber etc.,by natural curing at room temperature.In this paper,explosion experiment and related mechanical property measurement for RPCV0 and RPCV2 plates with steel fiber volume ratio 0 and 2%respectively and subjected to natural curing were carried out,and the explosion failure pattern of natural curing RPC plate is expounded.Experimental results show that the addition of steel fiber can increase the compressive and splitting tensile strength of RPC.When the same charge amount is detonated,the acceleration peak value on the back surface of RPCV2 plate is significantly lower than that of RPCV0 plate.There is cratering but there is no shock collapse on the face and back surface of RPCV2 plate.However,there is a large area shock collapse on RPCV0 plate.It is shown that the excellent anti-explosion and anti-shock collapse performance of RPCV2 plate is due to the plastic deformation ability of RPC matrix reinforced by steel fibers.
In view of the disadvantages of high temperature steaming for reactive powder concrete(RPC),the preparation technology of natural curing RPC is put forward in this paper.Natural curing RPC is a super strength concrete material prepared from high strength grade cement,high strength admixture and steel fiber etc.,by natural curing at room temperature.In this paper,explosion experiment and related mechanical property measurement for RPCV0 and RPCV2 plates with steel fiber volume ratio 0 and 2%respectively and subjected to natural curing were carried out,and the explosion failure pattern of natural curing RPC plate is expounded.Experimental results show that the addition of steel fiber can increase the compressive and splitting tensile strength of RPC.When the same charge amount is detonated,the acceleration peak value on the back surface of RPCV2 plate is significantly lower than that of RPCV0 plate.There is cratering but there is no shock collapse on the face and back surface of RPCV2 plate.However,there is a large area shock collapse on RPCV0 plate.It is shown that the excellent anti-explosion and anti-shock collapse performance of RPCV2 plate is due to the plastic deformation ability of RPC matrix reinforced by steel fibers.
引文
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[18]孙蓓,焦楚杰.常温活性粉末混凝土性能及其应用[J].施工技术,2018,47(21):70-74(SUN Bei,JIAO Chujie.Performance and application of reactive powder concrete with standard curing[J].Construction Technology,2018,47(21):70-74(in Chinese))
[2] Dennis S T,Baylot J T,Woodson S C.Response of 1/4scale Concrete Masonry Unit(CMU)walls to blast[J].Journal of Engineering Mechanics,2002,128(2):134-142.
[3] Silva P F,Lu B.Improving the blast resistance capacity of RC slabs with innovative composite materials[J].Composites Part B,2007,38(5/6):523-534.
[4] Pantelides C P,Garfield T T,Richins W D,et al.Reinforced concrete and fiber reinforced concrete panels subjected to blast detonations and post-blast static tests[J].Engineering Structures,2014,25(2):24-33.
[5]Wang Z L,Konietzky H,Huang R Y.Elastic-plastic-hydrodynamic analysis of crater blasting in steel fiber reinforced concrete[J].Theoretical&Applied Fracture Mechanics,2009,52(2):111-116.
[6] Mao L,Barnett S J,Tyas A,et al.Response of small scale ultra high performance fibre reinforced concrete slabs to blast loading[J].Construction and Building Materials,2015,28(3):822-830.
[7] Li J,Wu C,Hao H,et al.Experimental investigation of ultra-high performance concrete slabs under contact explosions[J].International Journal of Impact Engineering,2016,93(3):62-75.
[8]陈万祥,卢红标,侯小伟,等.高强钢筋加强混凝土板抗爆性能试验研究[J].振动与冲击,2015,34(10):135-141(CHEN Wanxiang,LU Hongbiao,HOU Xiaowei,et al.Tests for anti-blast performance of concrete slabs with high-strength reinforcements under blast loading[J].Journal of Vibration and Shock,2015,34(10):135-141(in Chinese))
[9] Fang Q,Zhang J.Three-dimensional modelling of steel fiber reinforced concrete material under intense dynamic loading[J].Construction&Building Materials,2013,44(7):118-132.
[10]赖建中,朱耀勇,谭剑敏.超高性能混凝土在埋置炸药下的抗爆试验及数值模拟[J].工程力学,2016,33(5):193-199(LAI Jianzhong,ZHU Yaoyong,TAN Jianmin.Experiment and simulation of ultra-high performance concrete subjected to blast by embedded explosive[J].Engineering Mechanics,2016,33(5):193-199(in Chinese))
[11]戎志丹,孙伟,张云升,等.超高性能水泥基复合材料的抗爆炸性能[J].爆炸与冲击,2010,30(3):232-238(RONG Zhidan,SUN Wei,ZHANG Yunsheng,et al.Anti explosion performance of ultra high performance cement based composite[J].Explosion and Shock,2010,30(3):232-238(in Chinese))
[12]焦楚杰,孙伟,高培正.钢纤维高强混凝土抗爆炸研究[J].工程力学,2008,25(3):158-166(JIAO Chujie,SUN Wei,GAO Peizheng.Study on steel fiber reinforced high strength concrete subject to blast loading[J].Engineering Mechanics,2008,25(3):158-166(in Chinese))
[13]李天华,赵均海,魏雪英,等.爆炸荷载下钢筋混凝土板的动力响应及参数分析[J].建筑结构,2012,42(5):786-790(LI Tianhua,ZHAO Junhai,WEI Xueying,et al.Dynamic response and parametric analysis on reinforced concrete slabs under blast loadings[J].Building Structure,2012,42(5):786-790(in Chinese))
[14]李砚召,王肖钧,张新乐,等.预应力混凝土结构抗爆性能试验研究[J].实验力学,2005,20(2):179-185(LI Yanzhao,WANG Xiaojun,ZHANG Xingle,et al.Test study on anti-detonation quality of presterssed concrete structure[J].Journal of Experimental Mechanics,2005,20(2):179-185(in Chinese))
[15] Richard P,Cheyrezy M H.Reactive powder concrete with high ductility and 200MPa-800MPa compressive strength[J].ACI SP,1994,144:507-518.
[16] Richard P,Cheyrezy M H.Composition of reactive powder concrete[J].Cement and Concrete Research,1995,25(7):1501-1511.
[17] Zhang Y,Sun W,Liu S,et al.Preparation of C200green reactive powder concrete and its static-dynamic behaviors[J].Cement&Concrete Composites,2008,30(9):831-838.
[18]孙蓓,焦楚杰.常温活性粉末混凝土性能及其应用[J].施工技术,2018,47(21):70-74(SUN Bei,JIAO Chujie.Performance and application of reactive powder concrete with standard curing[J].Construction Technology,2018,47(21):70-74(in Chinese))