Materials Research Express (Jan 2023)

Integrated design of a robust superhydrophobic cement mortar layer via sizing sand grains

  • Weirong Lin,
  • Tong Wu,
  • Chuanxi Wang,
  • Ruxin Zheng,
  • Dejun Wang,
  • Hui Hu,
  • Anmin Cai,
  • Zhe Meng,
  • Pan Sun,
  • Lei Feng,
  • Yilang Shi,
  • Shanglin Xiang,
  • Dongyu Cai

DOI
https://doi.org/10.1088/2053-1591/ad0c7e
Journal volume & issue
Vol. 10, no. 11
p. 115701

Abstract

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This work reported a facile route for fabricating super-hydrophobic concrete via sizing sand grains. It was found that mixing the sands with a size ranging from 150–180 μ m into cement enabled the formation of a lotus-like surface with a papillary structure at micro-scale. SEM showed that the size of bumper was about 3 μ m. When spraying a fluorocarbon solution onto this surface, the porous nature of the cement matrix showed the advantage of taking the fluorocarbon into the internal structure of the concrete via capillary force. As a result, the sub surface up to a depth of ∼1.5 mm were transformed into a thick superhydrophobic layer directly. The contact angle (CA) of water droplets could reach 157° on this surface, and which could remain more than 150° after abrasion 100 cycles under a weight of 300 g at 360 grit sandpaper. This thick hydrophobic layer significantly reduced the corrosion rate of the steel the concrete at the Cl ^- environment by 620 times. The measurement of British pendulum number and compression strength revealed that this superhydrophobic layer was beneficial for maintaining the friction coefficient of the concrete surface in wet condition without altering the mechanical integrity of the concrete.

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