CSA expansive additive description:
The CSA expansive additive is obtained by blending natural anhydrite with clinker powder which consists of calcium sulfoaluminate and CaO. This CSA expansive additive is always mixed with ordinary cement. When mixed in the proper proportion with ordinary cement and hydrated, cement mortar or concrete expands during the early stages of hydration. It is developed to reduce and compensate the hydraulic shrinkage of cement based construction products. Its performance is similar to Denka CSA #20, which is now widely used in the formulation of different mortars in Europe countries.Parameters | CSA Expansive additive I | CSA Expansive additive II | |
MgO % | ≦ 5.0 | ≦ 5.0 | |
Water content % | ≦ 3.0 | ≦ 3.0 | |
Total Alkali % | ≦ 0.75 | ≦ 0.75 | |
Chloride ion % | ≦ 0.05 | ≦ 0.05 | |
Specific Surface Area | ≧200m2/kg | ≧200m2/kg | |
Fineness | 1.18mm residue | ≦ 12 | ≦ 12 |
Setting time | Initial setting time | ≧ 0:45 | ≧ 0:45 |
Final setting time | ≦ 10:00 | ≦ 10:00 | |
Limited Expansive Rate (%) | 7 days in water | ≧0.025 | ≧0.05 |
21 days in air | ≧-0.020 | ≧-0.010 | |
Compressive strength (MPa) |
7days | ≧25 | ≧25 |
28days | ≧45 | ≧45 | |
Bending strength (Mpa) |
7days | ≧4.5 | ≧4.5 |
28days | ≧6.5 | ≧6.5 |
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