Ho Li Ngee
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Ho Li Ngee
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Ho, Li Ngee
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Li Ngee, Ho
Ho, Li Ngee
Ngee, Ho Li
Ho, L. N.
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57219028372
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DDY-6348-2022

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Physico-mechanical and microstructural evolution of sintered pressed geopolymer: dual effects of aging period and sintering temperature

2024-08-09 , Ong Shee-Ween , Heah Cheng Yong , Liew Yun Ming , Ho Li Ngee , Lee Wei Hao , Phakkhananan Pakawanit , Part Wei-Ken , Mohd. Mustafa Al Bakri Abdullah , Hang Yong-Jie , Lim Jia-Ni , Gao De-Wei , Liu Mei-Ju

Ceramics are highly valued for their exceptional thermal resistance and ability to withstand high temperatures. This study investigated the production of ceramic-like pressed geopolymer, focusing on the effects of aging period and sintering temperature. The results showed that the 7-day pressed geopolymer achieved the highest compressive (134.7 MPa) and flexural (34.9 MPa) strengths after sintering at 1000°C, with a density retention of 93.7 %, a mass loss of 7.9 %, and a thermal shrinkage of 1.4 %. Microstructural analysis at 1000°C showed a dense ceramic-like structure with nepheline formation. Phase analysis of the 7-day pressed geopolymer revealed a decrease in the amorphous phase as temperature increased, with nepheline formed at 800°C (26.0 %) and maximized at 1000°C (61.0 %). This work offers an optimal aging period and sintering temperature to maximize the mechanical strength and nepheline crystal formation, making them perfect for fire-resistant panels and precast construction products.

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