Experimental Parameter Control of SHPB Based on the Geopolymer Concrete
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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。Abstract: 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.
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图 4 采用不同规格整形器时典型的入射波
Figure 4. Typical incident waves under the conditions of different pulse shapers
图 5 采用直径为22 mm的整形器时实测的应变曲线
Figure 5. Measured strain-time curves with a 22 mm diameter pulse shaper
图 7 $\bar{\dot{\varepsilon }}$与v之间的关系
Figure 7. Correlativity between $\bar{\dot{\varepsilon }}$ and v
图 8 采用直径为20 mm的整形器时测得的应变率时程曲线
Figure 8. Measured strain rate-time curves with a 20 mm diameter pulse shaper
图 9 采用不同直径的整形器时获得的最佳应变率时程曲线
Figure 9. Optimum strain rate-time curves with different pulse shapers
图 10 $\bar{\dot{\varepsilon }}_{\text {optimum }}$与d之间的关系
Figure 10. Correlativity between $\bar{\dot{\varepsilon }}_{\text {optimum }}$ and d
表 1 矿渣和粉煤灰的化学组成(质量分数)
Table 1. Chemical compositions of slag and fly ash (Mass fraction)
(%) Material SiO2 Al2O3 Fe2O3 CaO Na2O TiO2 MgO K2O P2O5 SO3 Slag 29.2 19.4 5.8 38.6 0.2 0.6 2.8 0.1 2.6 Fly ash 45.8 21.4 12.6 13.7 1.1 0.2 1.3 1.8 0.1 1.9 
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表 2 ${{{\bar{\dot{\varepsilon }}}}_{\text{optimum}}}$与d和v的关系
Table 2. Relationship among ${{{\bar{\dot{\varepsilon }}}}_{\text{optimum}}}$, d and v
${{{\bar{\dot{\varepsilon }}}}_{\text{optimum}}}$/(s-1) d/(mm) v/(m/s) 10 8.2 2.59 20 15.9 3.58 30 20.4 4.57 40 23.6 5.56 50 26.0 6.55 60 28.1 7.54 70 29.8 8.53 80 31.3 9.52 90 32.6 10.51 100 33.7 11.50 110 34.8 12.50 120 35.8 13.49 130 36.7 14.48 140 37.5 15.47 150 38.2 16.46 160 39.0 17.45
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