NDLI: Preparation of Ultrafine Fly Ash-Based Superhydrophobic Composite Coating and Its Application to Foam Concrete

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Preparation of Ultrafine Fly Ash-Based Superhydrophobic Composite Coating and Its Application to Foam Concrete

Content Provider	MDPI
Author	Song, Huiping Tang, Mingxiu Lei, Xu Feng, Zhengjun Cheng, Fangqin
Copyright Year	2020
Description	The waterproof and thermal insulation property of foamed concrete is very important. In this study, the ultrafine fly ash (UFA)-based superhydrophobic composite coating was applied onto foam concrete. The UFA-based base coating that closely adhered to the concrete initially improved the waterproofness of the test block, and the silane coupling agent-modified UFA-based surface coating further achieved superhydrophobicity. The UFA on the coating surface and the asperities on the surface jointly formed a lotus leaf-like rough micro–nanostructure. The 154.34° water drop contact angle and 2.41° sliding angle on No. 5 coating were reached, indicating that it was a superhydrophobic surface. The water absorption ratios of the composite coating block were 1.87% and 16.6% at 4 h and 7 days, which were reduced by 97% and 75% in comparison with the original foam concrete. The compressive strength and heat conductivity coefficient after soaking for 4 h of the composite coating block were higher than 4.0 MPa and 0.225 W·m−1·K−1, respectively. The UFA-based superhydrophobic composite coating proposed in this study and applied onto foam concrete is simple and cheap, requires no precise instrument, and can be applied in a large area.
Starting Page	2187
e-ISSN	20734360
DOI	10.3390/polym12102187
Journal	Polymers
Issue Number	10
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-09-24
Access Restriction	Open
Subject Keyword	Polymers Coatings and Films Ultrafine Fly Ash (ufa) Foam Concrete Superhydrophobic Coating Waterproofing 1h,1h,2h,2h-perfluorodecyltriethoxysilane (hfds)
Content Type	Text
Resource Type	Article

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