Hydrophobic coating using rice husk ash and fatty acid (oil) for water repellant material

• Published in: AIP Conference Proceedings
• Main Author: Juhari N.; Min Y.H.; Wahid N.; Ahmad H.; Mazlan M.S.S.; Azwadi H.S.
• Format: Conference paper
• Language: English
• Published: American Institute of Physics Inc. 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176749213&doi=10.1063%2f5.0168815&partnerID=40&md5=60dcbe9337dec477ded38e2002057e57

Hydrophobic coating generally been classified as the ability to protect the surface against the penetration of substances such as water into the capillary pores of a surface which later resulting the depletion of strength and durability of the material. Tremendous efforts have been made for the hydrophobic coating using silane and siloxane as functionalizing agent, but it was claimed to be expansive and hazardous. In this present work, a non-toxic hydrophobic formulation using Rice Husk Ash (RHA) as the silica source and fatty acid (oil) as surface functionalizing agent were investigated for the water repellent material. Two (2) different types of fatty acid which were olive oil (OL) and waste cooking oil (WCO) were compared. It was found that the hydrophobicity was developed for both type of functionalizing agent with the WCA of greater than 1040. Highest value of WCA was developed when coating on the glass substrate with the ratio of OL: RHA (1:3). The water absorption test was carried out to further examined the effect of coating onto the concrete surface. The findings showed that for both type of fatty acids, the water absorption was reduced but not fully prevented. © 2023 Author(s).