基于地质聚合物混凝土的SHPB实验参数控制  

Experimental Parameter Control of SHPB Based on the Geopolymer Concrete

作　　者：罗鑫[1] 许金余[1,2] 苏灏扬[1] 李志武[1] 白二雷[1] 

机构地区：[1]空军工程大学机场建筑工程系,陕西西安710038 [2]西北工业大学力学与土木建筑学院,陕西西安710072

出　　处：《高压物理学报》2014年第4期416-422,共7页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(51208507;51378497);陕西省科技发展工业攻关项目(2014K10-15);陕西省青年科技新星项目(2013KJXX-81);空军工程大学优秀博士学位论文扶持基金(KGD082314005)

摘　　要：为有效地测试地质聚合物混凝土的冲击力学特性,以矿渣、粉煤灰为原材料,制备了高流态的C30地质聚合物混凝土,探索了此类混凝土的霍普金森压杆(SHPB)实验技术参数的控制规律,得到了射弹速度、整形器直径与最佳近似恒应变率之间的关系。结果表明:波形整形技术消除了波形振荡现象,有效地降低了弥散效应;整形后应力波形的前沿升时远远高于传统矩形波的前沿升时,保证了应力的均匀性;通过组合控制射弹速度和整形器直径,实现了恒应变率加载。In order to test the impact mechanical properties of geopolymer concrete （GC） effectively, the slag and fly ash were used to fabricate the highly fluidized C30 GC. Based on the prepared GC,the parameter control of split Hopkinson pressure bar （SHPB） system was investigated, and the law between striker velocity, pulse shaper diameter and the optimum constant strain rate was obtained. The results indicate that the pulse shaping technique eliminates the phenomenon of wave oscillation and reduces the dispersion effect effectively; the rise time of the stress wave after shaping is higher than that of rectangular wave, which guarantees the dynamic stress equilibrium; a nearly constant strain-rate loading can be achieved through the integrated control of striker velocity and pulse shaper diameter.

关 键 词：地质聚合物 高流态混凝土 霍普金森压杆 波形整形 参数控制 

分 类 号：O347[理学—固体力学] TU528[理学—力学]