Influence of a Nano-Hydrophobic Admixture on Concrete Durability and Steel Corrosion

• Published in: Materials Vol. 15; no. 19; p. 6842
• Main Authors: Cai, Jingshun, Ran, Qianping, Ma, Qi, Zhang, Hao, Liu, Kai, Zhou, Yang, Mu, Song
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01-10-2022; MDPI
• Subjects: Admixtures; Adsorbed water; Adsorption; Cement; Chloride; Chloride ions; chloride transportation; concrete durability; Concrete mixing; Concrete structures; Corrosion; Corrosion resistance; Corrosion resistant steels; Corrosion tests; Durability; Galvanized steel; Humidity; hydrophobic admixture; Hydrophobicity; nano material; Nanoparticles; Nuclear power plants; Permeability; Reinforced concrete; reinforcing steel corrosion; Reinforcing steels; Steel; China; hydrophobic admixture; nano material; reinforcing steel corrosion; chloride transportation; concrete durability
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15196842

Steel corrosion is major reason of the deterioration of reinforced concrete structures. Decreasing the transportation of erosion ions in concrete is one of effective methods to protect the steel from corrosion. In the present work, a novel nano-hydrophobic admixture is introduced to improve the ion-diffusion properties and the corrosion resistance of reinforced steel. Compared with unmodified concrete, the nano-hydrophobic admixture effectively decreases the water adsorption, water evaporation, and chloride ions transport in a concrete structure, and then improved the concrete's durability. The concrete's water adsorption decreased more than 78%, and the initial corrosion time of reinforced steel is prolonged more than one time by treatment with the nano-hydrophobic admixture. The inhibition penetration of the medium in concrete modified by hydrophobic nanoparticles is the key to provide the protective properties of steel reinforcement from chloride erosion.