THESIS
2013
xi, 83 pages : illustrations ; 30 cm
Abstract
Magnesium oxychloride cement (MOC)-based panels with composite aggregate of expanded
perlite/ paraffin (EP/PA) are manufactured by extrusion technique. This type of
energy-effective panels exhibited good thermal insulation properties and sufficient
mechanical strengths that are suitable for building exterior or structured walls to improve a
comfortable living or working environment. The experimental results demonstrates that the
highest temperature difference (ΔT) across panels under the emitting of infrared light can
reach 13.0 ºC in cyclic thermal test, due to the lower thermal conductivity of MOC matrix and EP/PA composite, in comparison to 4.9 ºC of the same thickness concrete panel. The lowest
thermal conductivity of the panel is 0.62 W/m·K with 40% EP and 10% PA incorporati...[
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Magnesium oxychloride cement (MOC)-based panels with composite aggregate of expanded
perlite/ paraffin (EP/PA) are manufactured by extrusion technique. This type of
energy-effective panels exhibited good thermal insulation properties and sufficient
mechanical strengths that are suitable for building exterior or structured walls to improve a
comfortable living or working environment. The experimental results demonstrates that the
highest temperature difference (ΔT) across panels under the emitting of infrared light can
reach 13.0 ºC in cyclic thermal test, due to the lower thermal conductivity of MOC matrix and EP/PA composite, in comparison to 4.9 ºC of the same thickness concrete panel. The lowest
thermal conductivity of the panel is 0.62 W/m·K with 40% EP and 10% PA incorporation.
The PA effects on thermal energy storage can be demonstrated by the time-delay
phenomenon at peak-temperature point of inner surface panel. In addition, the steady-heat
conduction test shows that ΔT is improved to 8.9 ºC, which is 6 ºC higher than that of control
specimen without EP/PA composite. For mechanical property test, the compression and
flexural stress of the panels vary from 15-45 MPa and 6-8 MPa, respectively. The EP/PA
composite incorporation has a negative effect on compressive stress, elastic modulus and
flexural stress. However, it is beneficial in enhancing compressive strain, flexural strain and
flexural toughness. Moreover, the water-resistance property can be enhanced by 1% KDP
incorporation, and the softening coefficient keeps around 0.75 at 7-day immersion in water.
Finally, most of specimens show expansion during the first 28 curing days due to the release
of high shear and compressive stress after extrusion, whereas 10% PA incorporation lead to
shrinkage of the specimen at early stage and then expand soon later. In conclusion, the
MOC-based panels with EP/PA composite made by extrusion have great potential for
building industry as the energy-effective building products to satisfy the requirements of
sustainable development of society.
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