Performance Control and Microscopic Mechanism of Steel Slag-Fly Ash Concrete under CO2 Mixing
CHENG Xu
TIAN Wei
XU Bohan
WU Daming
CAI Jiqi
Abstract：The simplex centroid mixture design method was employed to investigate the effects of CO2 mixing on the properties of steel slag(SS)-fly ash(FA)concrete.The results indicate that while CO2 mixing significantly reduces the slump of concrete,incorporating appropriate contents of SS and FA improved its flowability.During early hydration,CO2 mixing intensify the adverse effects of FA while mitigating the negative effect of SS.In later stages,increasing FA content leads to continuous strength reduction.Microstructural analysis reveals that systems with high SS content form high-density calcite,improving structural density,while systems with high FA content produce low-density aragonite.
Keywords：concreteCO2 mixingsimplex centroid methodcompressive strengthCO2 fixation rate
Publication Date：2025-09-30
Online Publishing Date：2025-10-17(First online date of this platform, not the publication date of the document)
Pages：10( 903-912 )