About the author:

1. China Railway Construction Bridge Engineering Bureau Group Co. , Ltd. , Tianjin 300300, China;2. Tianjin Key Laboratory of Intelligent Construction Technology and Equipment for PrefabricatedBridges, Tianjin 300300, China; 3. China Railway 18th Bureau Group Co. , Ltd. , Tianjin 300222,China; 4. Tianjin Urban Construction University, Tianjin 300384, China

Abstract:

In order to improve the flowability of reactive powder concrete (RPC), experiments wereconducted on RPC materials used for bridge swivel ball joint bearings. By using the method of controllingvariables, 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 addingappropriate amounts of mineral powder and silica fume instead of cement to the RPC system can fullyexert the filling effect of micro aggregates and the activity of volcanic ash, improve the compressivestrength of the system, and the optimal dosage of mineral powder and silica fume is 45kg / m3and 20kg / m3respectively. The addition of steel fibers can significantly improve the compressive strength of RPC, andthe optimal amount of steel fibers is 75kg / m3. The mechanism of action of water reducer in RPC mainlymanifests as electrostatic repulsion and steric hindrance, and the optimal dosage of water reducer is1.8kg / m3. Through the optimal experimental mix ratio test, the comprehensive performance of RPCmaterial meets the application requirements of bridge swivel ball joint bearings.