J. Sathish1* and P.
Petrochemical Engineering, SVS College of Engineering, Coimbatore-642 109,
SVS College of Engineering,
Coimbatore-642 109, India
Author Email :
Aim: To improve the
life of concrete by surface modifications and to increase hydrophobic nature
of concrete by porosity reduction through rice husk coating.
Methodology: Rice husk ash was
dispersed in ethanolic solution containing fluoroalkyl silone to prepare
super hydrophobic coating. This solution was sprayed on the layer of commercial
adhesive coated on the concrete.
Results: Water contact
angle of 150.3 was observed on the coated concrete. The cumulative water
uptake was reduced up to 40.38%.
Interpretation: Super hydrophobic
coating on concrete requires roughness which was created by silica particles
in the rice husk. Penetration of water into the coated concrete was
successfully reduced, but did not prevent completely. The coating did not
affect the surface hardness or the compressive strength, but surface porosity
Key words: Hydrophobicity, Modified concrete strength, Porosity,
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