Owing to their small size, good wettability, uniform dispersion ability and high thermal properties, the nickel-plated carbon nanotubes (Ni-CNTs) with different aspect ratios are used to reinforce reactive powder concrete (RPC) through modifying the nano/micro- structural units of concrete. Incorporating only 0.075 vol% of Ni-CNTs (0.03 vol% of CNTs) can significantly increase mechanical properties of RPC. The enhancement effect on compressive strength caused by the incorporation of Ni-CNTs with aspect ratio of 1000 reaches 26.8%/23.0 MPa, mainly benefiting from the high polymerization C-S-H gels, low porosity, and refined pore structure. The 33.5%/1.92 MPa increases of flexural strength can be attributed to the decrease of large pore, original cracks, molar ratio of CaO to SiO₂, and gel water content when Ni-CNTs with aspect ratio of 125 are added. Ni-CNTs with aspect ratio of 1500 have the largest utilization rate of being pulled-out, resulting from the improvement of dispersibility and the pining effect of nickel coating and then leading to the increased toughness. Therefore, incorporating Ni-CNTs can fundamentally modify the nano/micro- scale structural nature of RPC, providing a bottom-up approach for controlling the properties of RPC.

由于尺寸小，润湿性好，分散性均一且热性能高，具有不同长宽比的镀镍碳纳米管（Ni-CNT）用于通过改性纳米/微结构来增强活性粉末混凝土（RPC）。混凝土单位。仅掺入0.075体积％的Ni-CNT（CNT的0.03体积％）可以显着提高RPC的机械性能。纵横比为1000的Ni-CNT的引入对压缩强度的增强作用达到26.8％/ 23.0 MPa，这主要得益于高聚合CSH凝胶，低孔隙率和精细的孔结构。弯曲强度增加33.5％/ 1.92 MPa可以归因于大孔的减少，原始裂缝，CaO与SiO _2的摩尔比减少，当添加纵横比为125的Ni-CNT时，凝胶含水量。长宽比为1500的Ni-CNT具有最大的拉出利用率，这是由于镍镀层的分散性和钉扎效果得到改善，从而提高了韧性。因此，掺入Ni-CNT可以从根本上改变RPC的纳米/微米级结构性质，从而提供了一种自下而上的方法来控制RPC的性能。