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Study on micromechanism of a super-hydrophobic and self-cleaning coating made by recycled concrete wastes



Author(s): L.P. Guo, W. Su, T. Yu, B. Chen
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1643- 1650
Total Pages: 7
Language: English


Abstract: 
An organic-inorganic hybrid coating was studied for the outside concrete wall by the recycled concrete wastes with sol-gel method. The waste concrete was grinded to pass the sieves with the size of 80 micrometers. The grinded waste concrete powders were used as the film-forming materials. Ethanol, methoxy-silane and ammonia were adopted as the solvent, modifier and solidifying agent, respectively. An optimized production method was also proposed through analyzing the different performance of coating with different mix design and stirring time. Four primary properties were evaluated by the smeared coating on dried concrete plates, such as surface contact angles for different pH droplets, self-cleaning property, micro-scale morphology and chemical group analysis. The environmental scanning electron microscope, atomic force microscope, infrared spectrometer and video based contact angle measuring device were employed for above-mentioned tests. The results show that the Contact Angle (CA) for water on the produced super-hydrophobic coating is greater than 150º. Furthermore, this hard coating has obvious advantages of self-cleaning and spatial rough surface. Finally, the alkali and acid resistance tests prove that the produced organic-inorganic hybrid coating can be used in any solutions of pH 5-12.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00