Study on impact resistance of recycled GFRP powder geopolymer concrete panel with grid reinforcements
To investigate the dynamic response of glass fiber reinforce plastic(GFRP)-geopolymer concrete grid plate under impact,this paper utilized recycled GFRP powder,steel slag,and fly ash as precursor to form a new type of geopolymer concrete through alkali activation.Considering factors such as the amount of GFRP powder,impact energy,and the presence of a grid,the impact performance of geopolymer concrete slabs was tested and theoretically analyzed.Based on the elastic vibration theory of plates and considering the effect of the grid,a theoretical calculation method for the impact response of geopolymer concrete grid plates was proposed.The results showed that compared with geopolymer concrete without GFRP powder,the compressive strength of geopolymer concrete with 10％GFRP powder increased by 11.1％,the peak impact force of the geopolymer concrete slab increased by 30.8％,and the energy absorption increased by 16.1％.Compared with ungridded geopolymer concrete plates,the peak impact force of geopolymer concrete grid plates increased by 9.1％.In addition,the calculated values of sag displacement obtained by theoretical calculation agreed well with the experimental values.This paper proposes that the geopolymer formed by alkali activation of recycled GFRP powder can reduce CO2 emission and address environmental and resource issues.The geopolymer grid concrete plate formed has good impact resistance and energy absorption,and can be used in engineering collision protection structures.
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