Low alkalinity sulphoaluminate cement

Low alkalinity sulphoaluminate cement is mainly used in European structures Table 1-2 The Basic Requirements of National Standard GB20472-2006 on the Performances of Low-alkalinity Sulphoaluminate Cement StrengthSpecific Surface Area (m2/kg)Setting Time (min)Compressive Strength (Mpa)Breaking Strength (Mpa)GradeInitialFinal1 day7 days1 day7 days32.5> 400> 25< 1802532.53.5542.5> 400> 25< 1803242.545.552.5> 400> 25< 18039 .052.54.56Alkalinity: The cement paste with the cement-water ratio of 1:10, the PH value within one hour should be smaller than 10.5Free Swelling Rate: 0.00-0.10%1 within 28 days for the cement-sand ratio of 1:5 Low-alkalinity sulphoaluminate cement is mainly used in production of all kinds of GRC cement products, including: (1) GRC wall materials (interior partition board); (2) Outer wall insulation boards (interior insulation board of exterior wall, exterior insulation board of exterior wall); (3) GRC roofing design and construction and GRC network rack boards; (4) GRC granaries; (5) GRC perpetual pipe type mandrill (thin-walled cylinder); (6) GRC decorative outer wall boards; (7) Box type transformer rooms and shells; (8) GRC decorative products and landscape & environmental craft projects; the main material of GRC cement products in China