关键词: 石灰石粉;氯离子浓聚;Zeta电位;Friedel盐;固化能力

Abstract: The free chlorine ion content of the pore solution and XRD phase analysis of cement-ground limestone pastes were measured and the performance of chloride ion condensation was investigated.The results show that: The condensation index of the cement-ground limestone pastes decreases with concentration of chlorine ion.When the concentration of chlorine ion is 0.1 mol/L, the condensation index increases and then decreases with the content of ground limestone, the condensation index of the pastes with 10％, 20％, 30％ ground limestone increases by 9.1％, 98.2％, 94.2％ comparing to the pastes without ground limestone.The condensation index decreases and then increases with the fineness of ground limestone and the condensation index of the pastes with 608 m2·kg-1, 807 m2·kg-1 ground limestone decreases by 45.3％, 29.9％ comparing to the pastes with 412 m2·kg-1 ground limestone.Zeta potential of the pastes decreases with the concentration of chlorine ions, first increases and then decreases with the content of ground limestone, first decreases and then increases with the fineness of ground limestone.Under the effect of Mg2+, the condensation index of the pastes increases significantly.The content of the Friedel''s salt in the pastes increases, and the immobilizing ability of Cl-increases with the content of ground limestone.The immobilizing ability of Cl-increases and then decreases with the fineness of ground limestone.

Key words: ground limestone;chloride ion condensation;Zeta potential;Friedel's salt;immobilizing ability