粉煤灰制备地聚物复合材料低速冲击下力学性能OA

[Objective]In order to improve the resource utilization rate of fly ash and reduce its impact on the environment,this study is devoted to using fly ash as one of the main raw materials to prepare one-part fiber-reinforced geopolymer composites(OP-FRGC)and study its mechanical properties.[Methods]Fly ash and blast furnace slag were used as precursors,with polyethylene(PE),polyvinyl alcohol(PVA),and polypropylene(PP)fibers incorporated at a 2%volume fraction.Specimens were prepared,and static mechanical tests,impact resistance evaluations,and crack propagation analyses were conducted on the fiber-reinforced OP-FRGC samples.[Results]OP-FRGC incorporating 2%volume fraction PE fibers(OP-FRGC-PE)demonstrated superior performance.It achieved a compressive strength of 49.49 MPa,an ultimate tensile strain of 6.87%,and a tensile strength of 6.78 MPa,surpassing the values obtained for OP-FRGC incorporating 2%volume fraction PVA fibers(OP-FRGC-PVA)(44.56 MPa,3.57%,and 5.94 MPa)and OP-FRGC incorporating 2%volume fraction PP fibers(OP-FRGC-PP)(39.91 MPa,1.14%,and 4.96 MPa).In both single and repeated impact tests under energies of 5 J,10 J,and 15 J,OP-FRGC-PE exhibited the highest maximum impact force(12,477.4 N),which was 1.24 times that of OP-FRGC-PVA and 1.43 times that of OP-FRGC-PP.Furthermore,the maximum crack width and fractal dimension calculated under different impact energies and cycles showed that OP-FRGC-PE consistently exhibited lower maximum crack widths and fractal dimensions compared to OP-FRGC-PVA and OP-FRGC-PP,indicating reduced plastic deformation and lower impact damage.[Conclusion]Significant advantages are demonstrated by OP-FRGC-PE over PVA-and PP-reinforced systems in mechanical performance,impact resistance,and crack propagation control.These advantages indicate promising application prospects in engineering fields that demand high toughness,durability,and stringent crack control requirements.