Research on the mechanical properties and microstructure of ternary geological polymers
A ternary geopolymer was prepared using fly ash,blast furnace slag powder,and stainless steel slag powder.The ef-fects of raw material ratio,alkali activator content,and water glass modulus on the mechanical properties of the geopolymer were investigated,and the microstructure and phase composition of the samples were analyzed using SEM,EDS,and XRD.The results showed that the addition of blast furnace slag powder and stainless steel slag powder reduces the strength of the inert crystal peak,improves the Si/Al of the sample,and macroscopically improves the mechanical properties,and when the addition ratios of fly ash,mineral powder,and stainless steel slag powder are 80%,60%,and 40%,the compressive strength of the sample after 28 days reaches 70.1 MPa.The compressive strength of ternary geological polymers increases first and then decreases with the increase of alkali activator content and modulus.At the same time,the increase of compressive strength will lead to a decrease in the flexural strength of the sample,making it brittle and prone to shrinkage cracks.Compared with cement,the crystalline phase of ternary geopolymer mainly consists of unreacted inert substances in the raw materials,as well as newly generated sodium zeolite and calci-um zeolite,while the amorphous phase mainly consists of coexisting products of C-S-H and N(C)-A-S-H.