通过控制粉煤灰、矿渣用量制备基准强度分别为C50、C60和C70的普通地质聚合物混凝土试件，再掺入不同体积量(0.3%, 0.6%, 0.9% 和1.2%) 的钢纤维制备出钢纤维地质聚合物混凝土试件。采用霍普金森压杆(split Hopkinson pressure bar，SHPB)对试件在不同冲击气压(对应不同应变率)下的抗冲击性能进行研究，探讨钢纤维掺量、应变率及混凝土基准强度对试件动态抗压强度和韧性指数的影响；采用ABAQUS进行数值模拟，对模拟与试验结果加以分析和验证；建立钢纤维地质聚合物混凝土动态应力-应变本构模型。结果表明：各组试件的动态抗压强度随着应变率、混凝土基准强度的提高逐渐增大，而钢纤维掺量仅对强度较低地质聚合物混凝土产生较大影响；应变率的提高使试件完整性逐渐变差，而随着钢纤维掺量与混凝土基准强度的提高，试件完整性逐渐变好，冲击耗能与韧性逐渐增加；数值分析与试验结果吻合较好，验证了结果的可靠性；钢纤维地质聚合物混凝土动态应力-应变本构模型计算结果与试验结果整体吻合较，可用于预测冲击荷载下钢纤维地质聚合物混凝土的力学性能。
Abstract
Ordinary geopolymer concrete were used to prepare steel fiber geopolymer concrete(SFGC) by adding different steel fiber volume content(0.3%, 0.6%, 0.9% and 1.2%), with benchmark strength of C50, C60 and C70 by controlling the content of fly ash and slag. The impact mechanical properties of SFGC under different impact pressures (corresponding to different strain rates) were studied by Using Hopkinson pressure bar (SHPB) apparatus and the effect of steel fiber content, strain rate as well as concrete benchmark strength on dynamic compressive strength and toughness behavior of specimens was discussed. Numerical study was performed with ABAQUS and the results were analyzed and verified to establish the dynamic stress-strain constitutive model of SFGC. The results showed that the dynamic compressive strength increased gradually with the increase of strain rate and concrete benchmark strength, while the steel fiber content had significant effect on the SFGC with relatively low strength. Meanwhile, the integrity of SFGC decreased with the increase of steel fiber content but increased with the increase of concrete benchmark, and the impact energy consumption and toughness increased gradually as well. The numerical results agreed well with the test results, verifying the reliability of numerical study and proposed constitutive model. Moreover, the calculation results from dynamic stress-strain constitutive model of SFGC agreed well with the experimental results and it could be used to predict the mechanical behavior of SFGC under impact loading.
关键词
钢纤维 /
地质聚合物混凝土 /
动态抗压强度 /
韧性指数 /
有限元分析 /
应力-应变本构模型
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Key words
steel fiber /
geopolymer concrete /
dynamic compressive strength /
toughness index /
finite element analysis /
stress-strain constitutive model
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