Abstract This study evaluates the effects of two types of graphite nanoplatelet (GNP-C and GNP-M) and one type of carbon nanofiber (CNF) on rheological properties, hydration kinetics, autogenous shrinkage, and pore structure of ultra-high-performance concrete (UHPC). The dispersion method was optimized to secure uniform dispersion of the nanomaterials in the UHPC. The plastic viscosity decreased with the nanomaterials content as the content was increased from 0 to 0.05%. As the nanomaterials content increased from 0 to 0.3%, the duration of induction period was extended by the addition of CNF, but shortened by use of GNP-C or GNP-M; cumulative hydration heat release was increased by introduction of nanomaterials; the autogenous shrinkage of UHPC with CNF, GNP-C, and GNP-M was increased by 30%, 20%, and 20%, respectively. The use of 0.3% CNFs reduced the total porosity of the UHPC by approximately 35%, indicating that the presence of CNFs refined the microstructure of UHPC.

中文翻译：

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石墨纳米片和碳纳米纤维对 UHPC 流变学、水化、收缩、机械性能和微观结构的影响

摘要 本研究评估了两种石墨纳米片（GNP-C 和 GNP-M）和一种碳纳米纤维（CNF）对超高性能混凝土流变性能、水化动力学、自收缩和孔隙结构的影响。 （超高性能计算）。优化分散方法以确保纳米材料在 UHPC 中的均匀分散。随着纳米材料含量从0增加到0.05%，塑性粘度随纳米材料含量的增加而降低。随着纳米材料含量从0增加到0.3%，CNF的加入延长了诱导期，GNP-C或GNP-M的使用则缩短了诱导期；纳米材料的引入增加了累积水化放热；含有CNF、GNP-C和GNP-M的UHPC的自收缩分别增加了30%、20%和20%。使用 0。