Study on the Corrosion Resistance of Hydrophobic Cement Mortar

The cement-based composite materials are one of the most used materials in the world. The development of anticorrosive cement mortar or concrete is always a research hotspot. In this work, we adopted a facile and effective method to rationally fabricate the hydrophobic cement mortar. With the help of new-type hydrophobic agents [polynaphthylene-type (SW) and polycarboxylate-type (FS-W)], the prepared cement mortars possess excellent hydrophobicity (the contact angle can reach up to 102.3°), high compressive strength (the average value of modified cement mortars can increase by more than 50% compared with the common one) and superior anti-chloride ion penetration ability (the lowest chloride ion diffusion coefficient is about 1.4821 × 10 m/s). Additionally, the inner mechanism is also discussed by analyzing the results of the SEM and XRD. The addition of hydrophobic agents can change the hydration of the cement mortar. The chemical component, crystallinity and microstructure will determine the comprehensive performance of the cement mortar. This work can provide guidance for improving the service life of cement mortar in marine engineering.