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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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Utilization of rice husk ash for composite panel l.jpg

UTILIZATION OF RICE HUSK ASH FOR COMPOSITE PANEL


Abstract l.jpg

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


Introduction l.jpg

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.


Material formulation and process l.jpg

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


Experimental l.jpg

EXPERIMENTAL

  • Study on experimental production of the insulating composite and the determination of :

  • density

  • compressive strength

  • thermal conductivity

  • Sound absorption coefficient


Experimental6 l.jpg

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.


Experimental7 l.jpg

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.


Results and discussion l.jpg

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.


Results and discussion9 l.jpg

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.


Results and discussion10 l.jpg

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.


Conclusion l.jpg

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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