UTILIZATION OF UTILIZATION OF RICE HUSK ASHRICE HUSK ASH

FOR FOR COMPOSITE PANELCOMPOSITE PANEL

ABSTRACTABSTRACT

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

IntroductionIntroduction 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 MATERIAL FORMULATION AND PROCESSAND 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

EXPERIMENTALEXPERIMENTAL

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

•density

•compressive strength

•thermal conductivity

•Sound absorption coefficient

EXPERIMENTALEXPERIMENTAL

Sodium silicate compositeThe 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 350C for 3 hours.

EXPERIMENTALEXPERIMENTALLees’ disc method •suitable for measuring the thermal conductivity of poor conductors.

•constructed from three aluminium discs.

•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 DISCUSSIONRESULTS 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 DISCUSSIONRESULTS 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 RESULTS AND DISCUSSIONDISCUSSION

•The low compressive strength is The low compressive strength is unsuitable for use on its own. unsuitable for use on its own.

•The inclusion of expanded polystyrene The inclusion of expanded polystyrene and polyurethane will be experimented and polyurethane will be experimented to enhance its strength and insulation to enhance its strength and insulation properties. properties.

•The effect of spray applied coating on The effect of spray applied coating on its surface hardness and the acoustic its surface hardness and the acoustic thermal insulation properties will also thermal insulation properties will also be studied.be studied.

CONCLUSIONCONCLUSION Sodium silicate

90% SiO2 RHA Composite

•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.