Macroscopic Properties and Microscopic Mechanism of Hardened Early-Strength Solid Waste Based Cementitious Materials
LIAO Shucong
ZHANG Biao
WANG Xin
WU Xiaohuan
LI Zhiquan
Abstract：Based on the principle of synergistic utilization of industrial solid waste,an early-strength solid waste based cementitious material(SSC)was prepared using soda residue,slag,steel slag and desulfurization gypsum.The effects of soda residue on the mechanical properties,microstructure,hydrated products,pore structure,hydration kinetics and chloride ion adsorption capabilities of the SSC were investigated.The results indicate that soda residue significantly accelerates the early hydration of the SSC and enhances its early-age strength.Specifically,at an optimal mass ratio of soda residue to slag to steel slag to gypsum of 10.0∶49.5∶27.0∶13.5,the compressive strengths of the mortar specimens at 1 d and 28 d are 12.9 MPa and 44.5 MPa,respectively,with a chemical binding ratio of chlorine ion at 93%.Furthermore,the hydrated products within the hardened paste of the SSC exhibit a dense,interlocking and filling structure,with the primary hydrated products at 28 d being calcium silicate(aluminate)hydrate gel,ettringite and Friedel's salt,which form the foundational strength of the solid waste based cementitious material.
Keywords：solid waste based cementitious materialsoda residueFriedel's salthydrated product
Publication Date：2026-02-28
Online Publishing Date：2026-04-07(First online date of this platform, not the publication date of the document)
Pages：10( 175-184 )