纳米金属氧化物混凝土的冲击力学性能研究
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摘要
采用纳米Al_2O_3、纳米Fe_2O_3两种纳米氧化物制备了纳米混凝土,并利用Φ100 mm分离式霍普金森压杆(split Hopkinson pressure bar,SHPB)试验系统测试纳米混凝土试样在应变率范围为40～150 s-1内的冲击力学性能,分析冲击压缩荷载作用下试样的动态抗压强度、峰值应变、比能量吸收与平均应变率之间的关系。研究结果表明:纳米Fe_2O_3混凝土在较大应变范围内仍能保持强度,纳米Al_2O_3混凝土弹性模量随平均应变率的增大而增大;纳米Al_2O_3、纳米Fe_2O_3混凝土的峰值强度和峰值应力较普通混凝土显著提高;两种纳米混凝土的韧性均高于普通混凝土,说明纳米Fe_2O_3、Al_2O_3可用于提高混凝土的韧性。
The Nano-Fe_2 O_3( NF) and Nano-Al_2O_3( NA) are used to produce Nano-concrete. Nano-concrete compression mechanical properties with strain rate varying from 40 s~(-1) to 150 s~(-1) are tested by using the split Hopkinson pressure bar( SHPB) of 100 mm in diameter. The dynamic compressive strength,peak strain,and the relationship between specific energy absorption and strain rate are also analyzed. Experimental results show that the Nano-Fe_2O_3 concrete still keeps the strength in the large strain rate range,and the elastic modulus of Nano-Al_2O_3 concrete increase with the increase of the average strain rate. The dynamic compressive strength,specific energy absorption and peak stress of Nano-concrete increase significantly compared with ordinary concrete. The toughness of two kinds of Nano-concrete is higher than that of ordinary concrete,which shows that Nano-Fe_2O_3 and NanoAl_2O_3 can be used to improve the toughness of concrete.
The Nano-Fe_2 O_3( NF) and Nano-Al_2O_3( NA) are used to produce Nano-concrete. Nano-concrete compression mechanical properties with strain rate varying from 40 s~(-1) to 150 s~(-1) are tested by using the split Hopkinson pressure bar( SHPB) of 100 mm in diameter. The dynamic compressive strength,peak strain,and the relationship between specific energy absorption and strain rate are also analyzed. Experimental results show that the Nano-Fe_2O_3 concrete still keeps the strength in the large strain rate range,and the elastic modulus of Nano-Al_2O_3 concrete increase with the increase of the average strain rate. The dynamic compressive strength,specific energy absorption and peak stress of Nano-concrete increase significantly compared with ordinary concrete. The toughness of two kinds of Nano-concrete is higher than that of ordinary concrete,which shows that Nano-Fe_2O_3 and NanoAl_2O_3 can be used to improve the toughness of concrete.
引文
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[15]胡时胜,王礼立,宋力,等. Hopkinson压杆技术在中国的发展回顾[J].爆炸与冲击,2014,34(6):641-657
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[17]刘孝敏,胡时胜.大直径SHPB弥散效应的二维数值分析[J].实验力学,2000,15(4):371-376
[18]李为民,许金余,翟毅,等.冲击荷载作用下碳纤维混凝土的力学性能[J].土木工程学报,2009,42(2):24-30
[19]周助宝.最小耗能原理及其应用[M].北京:科学出版社,2001
[2] Florence Sancheza, Konstantin Sobolevb. Nanotechnology in concrete-A review[J]. Construction and Building Materials,2010,24(11):2060-2071
[3]王文军,郭昌生,朱向荣,等.纳米硅粉对水泥硬化浆体的改性研究[J].新型建筑材料,2008,35(6):53-56
[4] Li Hui,Xiao Huigang,Ou Jinping. A study on mechanical and pressure-sensitive properties of cement mortar with Nano-phase materials[J]. Cement and Concrete Research,2004,34(3):435-438
[5] Li Hui,Zhang Maohua,Ou Jinping. Flexural fatigue performance of concrete containing Nano-particles for pavement[J].International Journal of Fatigue,2007,29(7):1292-1301
[6] Li Hui,Xiao Huigang,Yuan Jie,et al. Microstructure of cement mortar with Nano-particles[J]. Composites:Part B,2004,35(2):185-189
[7]李惠,欧进萍.智能混凝土与结构[J].工程力学,2007,24(SⅡ):45-61
[8] Ali Nazari,Shadi Riahi. Al2O3nanoparticles in concrete and different curing media[J]. Energy and Buildings,2011,43(6):1480-1488
[9]赵习金,卢芳云,王悟,等.入射波整形技术的实验和理论研究[J].高压物理学报,2004,18(3):232-236
[10]李为民,许金余.大直径分离式霍普金森压杆试验中的波形整形技术研究[J].兵工学报,2009,30(3):350-355
[11] Song B,Chen W,Jiang X. Linking Option Spit Hopkinson pressure bar experiments on polymeric foams[J]. International Journal of Vehicle Design,2005,37(2-3):185-198
[12]姜冬梅.环烷基白油紫外光吸光度测定方法的对比研究[D].北京:中国石油大学,2008
[13]王一光,马克,张然,等.裹砂石法配制C80~C90高性能混凝土试验[J].建筑技术,1991,(1):26-28
[14] Ravichandran G,Subhash G. Critical appraisal of limiting strain rates for compression testing ceramics in a split Hopkinson pressure bar[J]. J. Am. Ceram. Soc.,1994,77(1):263-267
[15]胡时胜,王礼立,宋力,等. Hopkinson压杆技术在中国的发展回顾[J].爆炸与冲击,2014,34(6):641-657
[16]王礼立.应力波基础[M].北京:国防工业出版社,2005
[17]刘孝敏,胡时胜.大直径SHPB弥散效应的二维数值分析[J].实验力学,2000,15(4):371-376
[18]李为民,许金余,翟毅,等.冲击荷载作用下碳纤维混凝土的力学性能[J].土木工程学报,2009,42(2):24-30
[19]周助宝.最小耗能原理及其应用[M].北京:科学出版社,2001