Effects of Silica-Aluminum Molar Ratio on Mechanical Properties of Iron Tailings Geopolymer
ZHAO Pengcheng
WANG Jin
ZHAN Xinyuan
LU Hongyu
YUE Zhengbo
Abstract：The effects of the silica-aluminum molar ratio of the raw materials on the compressive strength,sodium(calcium)silicate aluminate hydrate(N(C)-A-S-H)gel content and microstructural aspects of iron tailings geopolymer(IOTG)were investigated by means of regulating the silica-aluminum molar ratio of the raw materials by blending bauxite(BX)and silica fume(SF)into iron tailings(IOT)for improving the mechanical properties of IOTG.The results show that the silica-aluminum molar ratio of the raw materials significantly affects both compressive strength and gel content of IOTG.When n(Si)/n(Al)is 2.0,the 28 d compressive strength and N(C)-A-S-H gel content of IOTG reach the maximum value synchronously with 32.13 MPa and 59.75%,respectively.The silica-aluminum molar ratio of the raw materials plays a stabilizing role in the formation of chain structures such as Si—O—T inside the gel product,effectively promoting the internal microstructure of IOTG towards densification and enhancing its mechanical properties.
Keywords：iron tailings geopolymersilica-aluminum molar ratiocompressive strengthgel contenteffect mechanism
Publication Date：2025-11-30
Online Publishing Date：2025-12-09(First online date of this platform, not the publication date of the document)
Pages：10( 1077-1085,1092 )