Development of Non-Chloride Concrete Setting Accelerator and the Study of its Application to Concrete Derived from Industrial Byproducts

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In high-performance concrete, a delay in setting may result with the addition of large amounts of superplasticizer, viscosity agent, and other admixtures. To solve this problem, a setting accelerator is used, which traditionally used to be calcium chloride (CaCl_2). However, calcium chloride is not used currently because it leads to corrosion of steel reinforcements. In the present study, we have developed non-chloride compound setting accelerator, in which aluminum sulfate (Al_2(SO_4)_3) and barium nitrate (Ba(NO_3)_2) are the main components instead of calcium chloride. The effects of these additives on setting property, flow property, and compressive strength were investigated when industrial byproducts such as fly-ash and blast-furnace slag were used in the high-flow concrete. The setting time was found to be shortened by about 30-40% while maintaining a similar flow property to concrete without a setting accelerator. The performance was increased by about 15% compared with that of the calcium nitrite accelerator which is presently used.