The compressive strength, setting time, pore structure and hydration product of Zn-doped, alkali-activated slag (AAS) matrix have been investigated by examination of physical properties, micropore analysis, thermal analysis, FTIR, SEM and TCLP methods. The results show that the effects of Zn 2 + on the AAS matrix depend on Zn 2 + ion concentrations. At low Zn 2 + ion concentrations, little negative influences on the compressive strength, setting time and distribution of pore structure were observed. Moreover, low concentrations of Zn 2 + ion could be effectively immobilized in the AAS matrix. For 2% Zn-doped AAS matrix, the hydration of AAS paste was greatly retarded and leaching from this matrix was higher than TCLP zinc limit even at 28 days. Based on the analyses of hydration products, the chemical fixation mechanisms are considered responsible for the immobilization of Zn 2 + ions in the AAS matrix.