Deformation behaviors of highly-fluidized geopolymer concrete during dynamic compression at high strain rates

Luo Xin; Xu Jin-yu; Su Hao-yang; Li Wei-min; Bai Er-lei

doi:10.11883/1001-1455(2014)02-0216-07

Volume 34 Issue 2

May 2014

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Luo Xin, Xu Jin-yu, Su Hao-yang, Li Wei-min, Bai Er-lei. Deformation behaviors of highly-fluidized geopolymer concrete during dynamic compression at high strain rates[J]. Explosion And Shock Waves, 2014, 34(2): 216-222. doi: 10.11883/1001-1455(2014)02-0216-07

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Luo Xin, Xu Jin-yu, Su Hao-yang, Li Wei-min, Bai Er-lei. Deformation behaviors of highly-fluidized geopolymer concrete during dynamic compression at high strain rates[J]. Explosion And Shock Waves, 2014, 34(2): 216-222. doi: 10.11883/1001-1455(2014)02-0216-07

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Deformation behaviors of highly-fluidized geopolymer concrete during dynamic compression at high strain rates

doi: 10.11883/1001-1455(2014)02-0216-07

Luo Xin^{1
,
,},
Xu Jin-yu^{1, 2},
Su Hao-yang¹,
Li Wei-min³,
Bai Er-lei¹

1.
Department of Airfield and Building Engineering, Engineering College, Air Force Engineering University, Xi'an 710038, Shaanxi, China
2.
College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an 710072, Shaanxi, China
3.
Airport Office, Air Force Logistics Department, Guangzhou Military Region, Guangzhou 510052, Guangdong, China

Funds: Supported by the National Natural Science Foundation of China (51208507, 51378497)

More Information

Corresponding author: Luo Xin, persun. shpb@163.com
Received Date: 2012-09-03
Rev Recd Date: 2012-12-12
Publish Date: 2014-03-25

Abstract

Abstract

The highly-fluidized geopolymer concrete(HFGC)with the strength grade of C30was prepared by using slag and fly ash as raw material as well as NaOH and Na₂CO₃as alkali activator.Dynamic compression tests were carried out for the prepared HFGC specimens by using the 100-mm-diameter split Hopkinson pressure bar (SHPB)apparatus improved by the pulse-shaping technique.And in the dynamic compression tests, the dynamic stress equilibrium and the nearly constant strain rate loading were achieved by controlling the technique parameters.Based on the above tests, the deformation behaviors of the HFGC under the impact loadings were analyzed.The HFGC belongs to brittle and strain-rate sensitive materials.The typical stress-strain curve of the HFGC concludes compaction stage, elastic stage, softening and yielding stage at high strain rates.In the strain rate range from 10to 100s^-1, the variation of the HFGC's peak strain with stain rate embodies obvious impact toughening, the peak strain increases firstly and then decreases with rising stain rate.And the overall change accords with the quadratic functionε_c=-1.2×10^-6+1.6×10^-4+0.001 7, and the critical strain rate of deformation behaviors is 66.7s^-1.The dynamic elastic moduli of the HFGC are lower than the quasi-static ones.
- solid mechanics,
- deformation behaviors,
- dynamic compression test,
- highly-fluidized geopolymer concrete,
- pulse-shaping technique

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References(30)

References

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