Effect of Relative Humidity on the Crack-Bridging Mechanism of CNTs at the CNT/C-S-H Interface.

As shown in Figure a–c, at RH = 50%, 60%, and 70%, the fracture strains­(ε u ) of CNT/C–S–H reached 0.338, 0.312, and 0.297, respectively, which were substantially higher than the corresponding fracture strain of the C–S–H system (i.e., 0.272, 0.252, and 0.251). Moreover, the fracture strain of the CNT/C–S–H system exhibited a decreasing trend with increasing RH.

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