In order to explore the evolution law of UHPC-NSC bond bending property under different interface roughness and interface joint structure,and reveal the deterioration mechanism of UHPC-NSC interface bond property under freeze-thaw environment,UHPC-NSC joint treatment methods(smooth(G),chisel(Z),fracture(D),diamond(L)and wedge(X))and freeze-thaw cycles(0,50,100,150,200,250 and 300 times)were used as test variables.The failure mode,bond flexural strength and flexural stiffness ofUHPC-NSC were investigated.The results show that the main deteriorated parts of UHPC-NSC specimens are NSC parts and bonding interfaces under freeze-thaw cycles,and the failure modes ofUHPC-NSC specimens are different with different joint treatments.The bond flexural strength and flexural stiffness ofUHPC-NSC specimens decreased to a certain extent under freeze-thaw conditions.Setting the interface joint structure can improve the interface bonding performance ofUHPC-NSC specimens,and the wedge-shaped specimens have the highest bond bending strength and stiffness in natural and freeze-thaw environments.It provides the experimental basis for the application of UHPC-NSC in freeze-thaw environment.
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