Csa expansive agent(denka csa equivalent)

Key Attributes.

Expansive Agent High-efficiency CSA Expansive Agent is obtained by blending suitable natural anhydrite with a specially manufactured clinker which consists essentially of calcium sulphoaluminate and CaO. High-efficiency CSA expansive agent is always mixed with ordinary cement. When mixed in the proper proportions with ordinary cement and hydrated, cement mortar or concrete expands during the early stages of hydration. This expansion, when restrained, makes it possible to minimize drying shrinkage. Moreover, when the ratio of High-efficiency CSA Expansive Agent to ordinary cement is increased its high expansion qualities make it ideal for use in prestressed concrete. High-efficiency CSA Expansive Agent is being used in all sections of the construction fields and by a wide variety of concrete products manufacturers. High-efficiency CSA Expansive Agent is manufactured under a strict quality assurance systems GB/T 19001-2000(i.e. ISO9001:2000) and GB/T 24001-1996(i.e. ISO 14001-1996) which accommodates the technical requirements of building chemistry formulators. The properties of High-efficiency CSA Expansive Agent conform to the standards of the manufacturer and to the Chinese relevant standards. 1.Low alkalinity. High-efficiency CSA Expansive Agent has a very low alkali content (R2O<0.3%) which is beneficial to avoid AAR in concrete. 2.Short stable stage of expansion. The stable stage of expansion is not more than 14 days, thus the ultimate strength of concrete is not affected. 3.Low dosage and high expansion capacity. The normal dosage of High-efficiency CSA Expansive Agent is 6~8% by the weight of ordinary cement, which is lower compared with other expansive additives such as UEA and CEA (their dosages are about 10~12% by the weight of cement) in the market. Features by using it 1.Prevents cracking due to drying shrinkage and hydration heats; 2.Increases the water tightness of concrete and thus is useful for waterproofing buildings; 3.Enables the manufacture of high strength concrete products through chemical prestressing. Main constituents (%) SiO2 Al2O3 Fe2O3 CaO MgO SO3 f-CaO R2O cl- Ig-loss Usual range 4~7 8~12 <1.5 50~55 2~4 22~25 10~15 <0.3 <0.05 <5 Mineral Composition: CaO, CaSO4, 3CaO.3Al2O3 .CaSO4 Specific Surface Area: 200~400m2/kg Specific Gravity: 2.8~3.0 The restrained expansion rate tested under standard condition: Dosage of High-efficiency CSA Expansive Agent to Ordinary Portland Cement% Restrained-expansion rate 7% Curing in water for 7 days 0.03 Curing in water fr 28 days 0.1 Curing in air, constant humidity for 21 days >-0.02