Synthesis of Carbon Black/Geopolymer Composites with High and Stable Electrothermal Performance

Geopolymer/nano carbon black composite is a promising electrically conductive smart material that can be used in self-heating and self-sensing applications. This paper studies the effect of adding nano carbon black to the physical, mechanical, electrical, and electrothermal performance of metakaolin-based geopolymer. Carbon black was added at the percent of ۵%, ۱۰%, ۱۵%, and ۲۰% by weight of metakaolin; the compressive strength was tested at various ages of ۷, ۱۴, ۲۸, and ۹۰ days, and the electrothermal performance was tested using AC and DC voltages. The results showed that a compromise between suitable compressive strength and high electrothermal conversion could be achieved when a specific balance between the carbon black percent and the lowest water content is established. A composite with a compressive strength of ۲۷ MPa and stable electrothermal performance reaching ۱۴۲°C at ۹V DC can be prepared using ۲۰ wt% of carbon black and a water-to-metakaolin ratio of ۰.۵۴۹, which is used as a smart material in construction applications.

کلیدواژه ها:

Geopolymer ، Nano carbon black ، Electrothermal ، Self-heating