... Q/ZTSO1-1999 Package:25Kg bag,1000Kg bag Improved rapid-hardening sulphoaluminate cementThe product obtained by grinding cement ... shall be blended with clinker during manufacture of improved rapid-hardening sulphoaluminate cement. It has high early strength. ... working time, improve the concrete workability, early strength, rapid hardening, freeze-resistance, impermeability and little expansion etc..3 ...