Experimental Study on Reactive Powder Concrete for Bridge Swivel Ball Joint Bearings
In order to improve the flowability of reactive powder concrete(RPC),experiments were conducted on RPC materials used for bridge swivel ball joint bearings.By using the method of controlling variables,the basic mix proportion of the RPC system is studied,and the effects of mineral admixtures,steel fibers,and water reducr on the RPC performance are explored.The results show that adding appropriate amounts of mineral powder and silica fume instead of cement to the RPC system can fully exert the filling effect of micro aggregates and the activity of volcanic ash,improve the compressive strength of the system,and the optimal dosage of mineral powder and silica fume is 45kg/m3 and 20kg/m3 respectively.The addition of steel fibers can significantly improve the compressive strength of RPC,and the optimal amount of steel fibers is 75kg/m3.The mechanism of action of water reducer in RPC mainly manifests as electrostatic repulsion and steric hindrance,and the optimal dosage of water reducer is 1.8kg/m3.Through the optimal experimental mix ratio test,the comprehensive performance of RPC material meets the application requirements of bridge swivel ball joint bearings.
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