外掺Cl对磷酸镁水泥离子溶出和孔结构的影响

Ionic Dissolution Behavior of Magnesium Phosphate Cement Containing Chlorine

通过测试不同Cl^(-)(NaCl)掺量磷酸镁水泥(MPC)浸取液中离子浓度及MPC硬化体的孔结构和吸水率,研究了Cl^(-)掺量和浸取时间对MPC硬化体平均孔径、孔隙率、孔径分布、孔体积分布、吸水率、MPC浸取液中Cl^(-)、Na^(+)、OH^(-)、Mg^(2+)、PO_(3)-4和K^(+)浓度的影响,结果表明外掺Cl^(-)对MPC孔结构、离子溶出及吸水率有显著影响,当Cl^(-)掺量为1%时,MPC硬化体结构密实、孔隙率低、平均孔径小、吸水率小、MPC水化产物在水中的溶蚀量小。

By measuring the ion concentration in the leaching solution of MPC with different Cl^(-)(NaCl)contents and the pore structure and water absorption of MPC hardened bodies,the effects of Cl^(-)content and leaching time on the average pore size,porosity,pore volume distribution,water absorption,and the Cl^(-),Na^(+),OH^(-),Mg^(2+),PO_(3)-4 and K^(+)concentrations in magnesium phosphate cement(MPC)leach solutions were studied.The results show that the addition of Cl^(-)has a significant effect on the pore structure,ion dissolution and water absorption of MPC.The MPC hardened material has a compact structure,low porosity,small average pore size,low water absorption,and a small amount of MPC hydration products in water when the Cl^(-)content is 1%.