Study on Dynamic Compression Properties of Geopolymer Composites Reinforced by Polyvinyl Alcohol Fiber
In order to improve the toughness of geopolymer,fly ash,blast furnace slag,and anhydrous sodium silicate were used as raw materials to prepare geopolymers,and PVA fibers were used to toughen geopolymer.The response surface model was used to study the effects of fly ash and slag ratio,fiber length,and fiber content on the dynamic compressive strength and toughness of geopolymer.The Hopkinson pressure bar test was used to investigate the toughness of geopolymer.The results showed that the dynamic compressive strength of the samples with added fibers ranged from 123.21 to 226.23 MPa,which was 1.2 to 2.2 times that of the blank group.This was because the bridging effect effectively blocked the propagation of stress waves in the specimen,improving the compressive strength.The toughness ranged from 0.52 to 1.22 MJ/m3,which was 1.2 to 2.9 times higher than that of the blank group samples;The F values of fiber content,fiber length,and their interaction effect were greater than 1,and the P values were less than 0.05,indicating that they had greater impacts on the dynamic compressive strength of the specimen than other factors,the influences of fiber length,fly ash and slag ratio and their interaction effect on toughness were greater than other factors;Under the optimal experimental factors,the theoretical values of dynamic compressive strength and toughness of geopolymer were 228.19 MPa and 1.25 MJ/m3,which were in good agreement with the experimental results.
PVA fibertoughnessgeopolymerHopkinson pressure bar test
万方数据
维普
