Comparative study on early impact properties of fiber reinforced geopolymeric concretes

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (10) : 163-168.

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Comparative study on early impact properties of fiber reinforced geopolymeric concretes

Luo Xin1;Xu Jinyu1,2;Li Weimin1

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Abstract

In order to make a comparative study on the effect of various fibers on early mechanical properties of geopolymeric concrete (GC). First, slag and fly ash, were used in the fabrication of GC reinforced with basalt and carbon fibers of various volume fractions, and liquid sodium silicate and sodium hydroxide were used for slag and fly ash activation. Then after 3 and 7 days standard curing, impact properties of basalt fiber reinforced geopolymeric concrete （BFRGC）and carbon fiber reinforced geopolymeric concrete (CFRGC) were investigated using a 100-mm-diameter split Hopkinson pressure bar (SHPB ) apparatus, and comparison of the experiments was analyzed. The results show that early impact properties of fiber reinforced geopolymeric concretes (FRGCs) exhibit strong strain rate dependency. Early dynamic strength properties of BFRGC are better than those of CFRGC. In the range of 10–102 s-1, BFRGC and CFRGC possess the same grade of specific energy absorption, but compared to CFRGC, the priority in energy absorption capacity of BFRGC becomes more and more prominent with increase of average strain rate. From the above comparison, it was concluded that BFRGC possesses excellent early impact properties, which can be mainly displayed by dynamic strength properties and energy absorption capacity

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Fiber reinforced geopolymeric concretes (FRGCs) / Basalt fiber / Carbon fiber / Early impact properties / split Hopkinson pressure bar (SHPB)

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Luo Xin;Xu Jinyu;Li Weimin. Comparative study on early impact properties of fiber reinforced geopolymeric concretes[J]. Journal of Vibration and Shock, 2009, 28(10): 163-168