Numerical Analysis Of Rheological Properties Of Reactive Powder Concrete

Since be invented in the1990s, reactive powder concrete is widely used in the field of civil engineering because of its excellent mechanical properties and durability. In actual use often need to control the mobility of the concrete. Due to its low mobility, reactive powder concrete should been compacted by vibration in production.This paper use a Computational Fluid Dynamic software, FLOW-3D, to carry out numerical analysis for the rheological properties of reactive powder concrete numerical, use the principles of rheological and Bingham fluid model to determine constitutive parameters of concrete, use two variable parameters, yield stress and plastic viscosity to control the mobility of concrete.Controlling the ambient temperature, the steel fiber content and the Vibration frequency in construction, establish uniform single-fluid model and the dual-liquid suspension element model, for analysis. Though compare and analysis, we can see that the two model’s simulation results are similar. When establish suspension element model considering the steel fiber content, the calculation process is more complex, with a more accurate simulation result; when considering the impact of external factors, such as ambient temperature and construction vibration frequency, the dual-liquid suspension element model can greatly reduce the calculation time and guarantee the basic accuracy of the result.From the Analysis results, used in the construction, reactive powder concrete, the shaking frequency to complete vibration compacting are normally controlled to between45-55Hz. When the ambient temperature is low, the mobility of the reactive powder concrete materials is lower; with increasing ambient temperature, the mobility gradually increased, and the time of RPC material to complete vibration compacting gradually reduced. Similarly, the steel fiber content will impact reactive powder concrete’s mobility, reactive powder concrete’s mobility decrease with the increase of fiber content, but this effect decreases gradually when the steel fiber content reaches a certain level.Comparison the experimental results with the data provided by the relevant reach, we can see that the simulation results is accurate. This reach show that software analysis can greatly reduce the workload of the experimental analysis, and to a certain extent, it can guide the construction process.