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Investigation of Mechanical Properties and Microstructure of Various Fabric-Reinforced Geo-Composite at Elevated Temperature

Nhan Phan Thanh

Abstract


Series of experiments is used to investigate mechanical strength of various fabric-reinforced geocomposites at elevated temperature (up to 1000 oC). A correlation between increase in mechanical strength and the microstructure reliability of fabric reinforced geocomposites is established in elevated temperature range. The mechanical strength of the fabric reinforced geocomposites is investigated at elevated temperature in terms of physical, fire testing and thermal conductivity. The result proves that the strength of carbon based geopolymers increased towards higher temperature that strongly correlated with development of various microstructures. Fire testing was conducted on 3 mm thick panels with surface exposure of region 14 x 90 mm. The fires rating more than half an hour were achieved with resistance to shrinkage cracking exhibited as important parameter. The microstructure of geocomposites shows large pores towards 600 ºC, that indicated lower in mechanical strength. On increasing the temperature, microstructure of carbon based geocomposites shows oxidized layer and very homogenous layer with less porosity. As a result the mechanical strength increases on increasing the temperature and developing oxidized layer. Fiber reinforced composites may be considered as an alternative to improve flexural strength and fracture toughness at elevated temperature. The carbon reinforced geocomposite proves as one of the suitable candidates for the high temperature applications such as thermal barrier and fire resistant panels.

Keywords


Mechanical strength, Geocomposite, Carbon fabric, Geopolymer, High temperature.

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