Impact mechanical properties of steel fiber geopolymer concrete

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (3) : 1-11.

YE Jianfeng, LIU Xiancheng, YAN Guiyun, HUANG Guanhua, ZHUANG Jinping

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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.

Key words

steel fiber / geopolymer concrete / dynamic compressive strength / toughness index / finite element analysis / stress-strain constitutive model

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YE Jianfeng, LIU Xiancheng, YAN Guiyun, HUANG Guanhua, ZHUANG Jinping. Impact mechanical properties of steel fiber geopolymer concrete[J]. Journal of Vibration and Shock, 2023, 42(3): 1-11

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