الوصف

Low-alkalinity cement is high early-strength, low alkalinity, small free expansion.used in light-weight complex wall. Detailed Description The product obtained by grinding sulphoaluminate cement clinker, consisting of essentially anhydrous calcium sulphoaluminate. Suitable gypsum shall be blended with clinker during manufacture of low-alkalinity cement. The product has low alkalinity and small free expansion property. It is hydraulicity binding material. The code no is L-SAC. The product carries out the standard: JC/T*******7. The strength grade depends on its7 days compressive strength. There are three grades: *2.5, *2.5. The product achieved a class second provincial prize of excellent new product, a class third provincial prize of improvement science and technology. Main technical indexes 1. Specific surface area: ≥**0/kg. 2. Setting time: Initial setting time: ≥*5 min. Final setting time: ≤**0 min. 3. Alkalinity To the cement paste under the condition C/W=*0:1, the PH after hydrating 1 hour is less than *0.5. 4. Free expansive ratio: Under the condition cement/sand=1:0.5, the free expansive ratio is 0.*0%*0.*5% in *8 days. strength in different age are not less than the following: 1d, Compressive strength (M pa):*5.0MPa 7d, Compressive strength (M pa):*2.5MPa 1d, Bending strength (M pa): 3.5MPa 7d, Bending strength (M pa): 5.0MPa. Properties: Besides the high early-strength property as rapid-hardening cement, low alkalinity cement has some other characteristics such as low alkalinity small expansive ratio, short stability time and small dry-shrinkage rate, compounded with glass fiber. It has high strength retaining ratio and longer work-time, so it is the special cement for making GRC products.