Utilization of rice husk ash and silicone rubber in the production of moisture-fire retardant geopolymer composite coating using response surface methodology

Tee, Hui Yek (2020) Utilization of rice husk ash and silicone rubber in the production of moisture-fire retardant geopolymer composite coating using response surface methodology. [Project Paper] (Submitted)

Text lp FK 2020 44.pdf Download (85MB)

Abstract

Rice husk is the major solid waste in rice processing and is usually processed to be rice husk ash (RHA). The utilization of rice husk ash through green technology is vital as a proper disposal method. Geopolymer (Ge) coating is known as a green material and usually made by rice husk ash due to high silica content. It is served as the protective coating to protect the different surface materials, including metal. In this study, the geopolymer coating is applied on the surface of steel plate as the steel plate is one of the materials used in support system of food equipment that cannot withstand high temperature and moisture attack. Silicone rubber (SIR) is added as an additive to extend the shelf life of RHA-based geopolymer coatings since silicone rubber can enhance the moisture and fire retardant properties. The research objectives are to determine the significant effect of different factors and optimum composition of SiR-RHA-Ge coating composite using fractional factorial design (FrFD) and response surface methodology (RSM). Three factors were considered, namely: (i) Molarity of sodium hydroxide (NaOH); (ii) RHA to activated alkaline solution (AA solution) (Ge) ratio; and (iii) SiR to Ge ratio, with AA solution at a constant ratio of 5.5. The result showed that NaOH concentration is the most influential factor on the fire retardant test, while the RHA/AA ratio is the most influential factor on the moisture absorption test. The pair of RHA/AA and SiR/Ge ratio was chosen due to reducing overall material cost. The optimum value for both fire retardant and moisture resistance properties could be achieved when the RHA/AA ratio is 0.85, and the SiR/Ge ratio is 0.70, with 14 M of NaOH. Then, SEM micrographs of SiR-RHA-Ge coating composite were provided as the evidence to prove it can potentially improve the moisture and fire retardant properties when silicone rubber added.

Item Type:	Project Paper
Faculty:	Faculty of Engineering
Depositing User:	Ms. AZLINA ZAINAL ABIDIN
Date Deposited:	19 Oct 2023 08:09
Last Modified:	19 Oct 2023 08:09
URI:	http://psaspb.upm.edu.my/id/eprint/1601

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