Abstract
Ultra-high Performance Concrete (UHPC) is a kind of advanced cement-based material normally designed based on particle close packing model, such as modified Andreasen and Andersen model. However, in the utilization of this model, some key parameters have not been deeply understood. Therefore, in this research, the multiple effect of typical parameters (q value and Dmax) on the properties of UHPC are clearly clarified based on mechanical property evaluation, wet packing density, low-field NMR and X-ray Computed tomography (X-CT). The obtained results show that when different maximum particle sizes are chosen, there is an optimized q value to develop UHPC (q 0.17 for Dmax 1.25 mm; q 0.23 for Dmax 2.19 mm; q 0.25 for Dmax 4.36 mm; q 0.25 for Dmax 6.61 mm) with the lowest porosity and largest strength. Comprehensively consider the performance of UHPC, the suggested Dmax should be 2.19 mm, while the chosen q value is 0.23. At last, stereological theory is employed to get the quantity distribution of aggregates, and the aggregate particles random packing model is established to visualize the real aggregate particles packing in UHPC. And a new design concept for UHPC mix proportion design is provided.
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