Abstract In this paper, C200 ultra-high performance concrete (UHPC) containing coarse aggregate was prepared. Firstly, four different maximum size and three different type of coarse aggregate having significant differences in strength, surface texture, porosity and absorption were used to prepared the mixtures. Secondly, the effect of maximum size and type of coarse aggregate on the workability of the fresh UHPC and the mechanical behaviour of harden UHPC were investigated. Finally, a series micro-tests including mercury intrusion porosimetry (MIP), scanning electron microscope (SEM), X-ray diffraction (XRD) were conducted and the mechanism of the C200 UHPC were discussed. The results show that the type and maximum size of coarse aggregate have significant effect on the workability and mechanical properties of C200 UHPC. The basalt coarse aggregate with maximum size of 10mm can be used to prepare the C200 UHPC. The compressive strength and flexural strength of the C200 UHPC is 203MPa and 46MPa at 90 day, respectively. Besides, the micro-tests data show that the C200 UHPC has a compacted matrix and strong interface transition zone (ITZ), which make the aggregate potential strength fully used.

中文翻译：

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含粗骨料C200超高性能混凝土（UHPC）的静态力学性能及机理

摘要 本文制备了含粗骨料的C200超高性能混凝土(UHPC)。首先，使用强度、表面纹理、孔隙率和吸收率具有显着差异的四种不同的最大粒度和三种不同类型的粗骨料制备混合物。其次，研究了粗骨料的最大尺寸和类型对新鲜 UHPC 和易性和硬化 UHPC 力学行为的影响。最后，进行了压汞孔隙率（MIP）、扫描电子显微镜（SEM）、X射线衍射（XRD）等一系列微观测试，并讨论了C200 UHPC的机理。结果表明，粗骨料的种类和最大粒径对C200 UHPC的和易性和力学性能有显着影响。最大粒度为10mm的玄武岩粗骨料可用于制备C200 UHPC。C200 UHPC的抗压强度和抗弯强度在90天时分别为203MPa和46MPa。此外，微量试验数据表明，C200 UHPC具有致密的基体和强界面过渡区（ITZ），充分利用了骨料的潜在强度。