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UTILIZATION OF RICE HUSK ASH FOR COMPOSITE PANEL

UTILIZATION OF RICE HUSK ASH FOR COMPOSITE PANEL. ABSTRACT. Rice husk ash is used as a siliceous material to produce a composite panel with acoustic thermal insulation properties. The rice husk ash has about 90% of silica content. Sound absorption coefficient = 0.79 (at 2 KHz)

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UTILIZATION OF RICE HUSK ASH FOR COMPOSITE PANEL

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  1. UTILIZATION OF RICE HUSK ASH FOR COMPOSITE PANEL

  2. ABSTRACT • Rice husk ash is used as a siliceous material to produce a composite panel with acoustic thermal insulation properties. • The rice husk ash has about 90% of silica content. • Sound absorption coefficient = 0.79 (at 2 KHz) • Coefficient of thermal conductivity = 0.184-0.224Wm-1K-1

  3. Introduction • Rice husk can be utilised as a source of renewable energy. • Calorific value = 15MJ/kg • Micronised RHA contained high silica. • This study explored the use of RHA to produce a lightweight sodium silicate thermal insulation composite material.

  4. MATERIAL FORMULATION AND PROCESS • RHA is used as a siliceous material. The mixture of RHA and sodium silicate solution • placed in a 50 mm cube mould at a predetermined depth • subjected to elevated temperature in a furnace

  5. EXPERIMENTAL • Study on experimental production of the insulating composite and the determination of : • density • compressive strength • thermal conductivity • Sound absorption coefficient

  6. EXPERIMENTAL Sodium silicate composite • The RHA was mixed with sodium silicate solution in a ratio of 1:3 by weight. • filled into a cube mould at about one-third of its depth • furnace at 350C for 3 hours.

  7. EXPERIMENTAL • suitable for measuring the thermal conductivity of poor conductors. • constructed from three aluminium discs. Lees’ disc method • The heating element was sandwiched between the first and second disc and the test specimen was placed between the second and third disc. • The discs and test specimen were clamped together firmly with the heating element and were then placed on the stand.

  8. RESULTS AND DISCUSSION The micronised RHA • specific gravity of 2.21 • moisture content of 1.28% • specific surface of 1050.8 m2/kg. • bulk density of RHA is approximately 498 kg/m3.

  9. RESULTS AND DISCUSSION RHA composite • Density = 400 to 450 kg/m3. • Compressive strength = 1.65 to 1.85 MPa. • The composite was found to have a coefficient of thermal conductivity ranging from 0.184 to 0.224 Wm-1K-1.

  10. RESULTS AND DISCUSSION • The low compressive strength is unsuitable for use on its own. • The inclusion of expanded polystyrene and polyurethane will be experimented to enhance its strength and insulation properties. • The effect of spray applied coating on its surface hardness and the acoustic thermal insulation properties will also be studied.

  11. Sodium silicate 90% SiO2 RHA Composite CONCLUSION • density ranging from 400 to 450 kg/m3. • compression strength was between 1.65 to 1.85 Mpa. • coefficient of thermal conductivity = 0.207 Wm-1K-1 • low compressive strength makes it more suitable for use as an acoustic thermal insulation composite material.

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