In this paper, four types of multi-walled carbon nanotubes (MWCNTs) were incorporated into reactive powder concrete (RPC) with water or heat curing. The enhancing effects of MWCNT types and curing methods on mechanical properties of RPC were investigated. Experimental results indicate that adding proper type and content of MWCNTs can effectively improve mechanical properties of RPC including flexural strength, fracture energy, compressive strength/toughness and flexural strength to compressive strength ratio. In general, these mechanical properties of MWCNTs filled RPC with heat curing are superior to that with water curing, which indicates that heat curing is more beneficial for reinforcing impact of MWCNTs to RPC than water curing. In most cases, the critical length of MWCNTs in RPC is smaller than actual length, which indicates MWCNTs will be snapped when damage occurs in RPC. In addition, the reinforcement of MWCNTs to RPC results from crack bridging and pull out effects.

本文将四种类型的多壁碳纳米管（MWCNT）掺入经过水或热固化的反应性粉末混凝土（RPC）中。研究了MWCNT类型和固化方法对RPC的力学性能的增强作用。实验结果表明，添加适当种类和含量的多壁碳纳米管可以有效改善RPC的力学性能，包括抗弯强度，断裂能，抗压强度/韧性以及抗弯强度与抗压强度比。通常，热固化填充的MWCNTs的这些机械性能优于水固化，这表明热固化比水固化更有利于增强MWCNTs对RPC的影响。在大多数情况下，RPC中MWCNT的临界长度小于实际长度，这表示当RPC中发生损坏时，MWCNT将被捕捉。另外，MWCNT对RPC的增强来自裂纹桥接和拉拔效应。