Description

CSA expansive agent is mixed with ordinary cement and hydrated, cement mortar or concrete, to minimize drying shrinkage. High-efficiency CSA Expansive Agent is manufactured under a strict quality assurance systems GB/T *********0(***** ISO***1:***0) and GB/T *********6(***** ISO *********6) CHEMICAL ANALYSIS Main constituents (%) SiO2 Al2O3 Fe2O3 CaO MgO SO3 f-CaO R2O cl- Ig-loss Usual range 4~7 8~*2 <1.5 *0~*5 2~4 *2~*5 *0~*5 <0.3 <0.*5 <5 Mineral Composition: CaO, CaSO4, 3CaO.3Al2O3 .CaSO4 Specific Surface Area: **0~**0m2/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 :7% Restrained-expansion rate (%) with Curing in water for 7 days:0.*3 Restrained-expansion rate (%) with Curing in water for *8days:0.1 Restrained-expansion rate (%) with Curing in air, constant humidityfor*1 days:>*0.*2 CHARACTERISTICS 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 *4 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 *0~*2% by the weight of cement) in the market.