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...[ Read more ]

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.