关键词: 碱式硫酸镁水泥;聚合物;粘度;凝结时间

Abstract: In order to study the workability of polymer modified basic magnesium sulfate cement for pavement crack repair , the viscosity , groutability and setting time of modified basic magnesium sulfate cement with different mixing ratio were tested . The effect of different amount of polymers on the performance of basic magnesium sulfate cement is also discussed .The results show that the viscosity of basic magnesium sulfate cement decreased with the increase of the amount of polymer , with better fluidity and groutability .When the addition amount of polymer is 20％, the modified basic magnesium sulfate cement shows the 30 min viscosity of 17 s, reduced by half compared to the 30 min viscosity of alkaline magnesium sulfate cement which the polymer is not mixed with .The coagulation time of basic magnesium sulfate cement increased first then decreased with the increase of the amount of polymer .Compared with the control basic magnesium sulfate cement , with the polymer content of 10％and 20％, the coagulation time was delayed by 3 h and shortened by 50 min, respectively .

Key words: basic magnesium sulfate cement;polymer;viscosity;setting time