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Journal of Applied Mathematics and Statistical Applications | Volume: 1

August 23-24, 2018 | London, UK

Applied Physics

International Conference on

The effects of bauxite, metakaolin, and porosity on the thermal properties of prepared Iraqi clays

refractory mortars

Mustafa Hassan Omar

University of Technology, Iraq

ne of the most important requirements for the

manufacture of refractorymortars, especially those used

in theconstructionof thermal systems (buildingor plastering),

is the balance between thermal insulation properties and

porosity. Where, increasing porosity of mortar to a large

amount may be always undesirable, because the absorption

of liquid and gases emitted from industrial system is decline

the bonded with bricks and structural properties of mortars.

Refractory mortars prepared from either fired bauxite or

metakaolin clays with different percentages of kaolin (10, 20,

30, and 40 wt. %). Bauxite rocks were fired at 1200 °C and

metakaolin was obtained by firing kaolin up to 700 °C then

crushed and grinded. Grog was added to mixture to reduce

the shrinkage. Cylindrical specimens are prepared and then

sintered at 1200 °C. All mixtures maintained a low thermal

conductivity within the limits of thermal insulation material

(less than 0.5W/m. K); it was done by controlling the porosity

which reached a maximum value approximately 25%. The

volumetric heat capacity and thermal diffusivity was ranged

between (1–10 MJ/m3 K), (0.06–0.2 mm2/s), respectively.