Abstract
This paper clarified the microstructural element distribution and electrical conductivity changes of kaolin, fly ash, and slag geopolymer at 900 °C. The surface microstructure analysis showed the development in surface densification within the geopolymer when in contact with sintering temperature. It was found that the electrical conductivity was majorly influenced by the existence of the crystalline phase within the geopolymer sample. The highest electrical conductivity (8.3 × 10−4 Ωm−1) was delivered by slag geopolymer due to the crystalline mineral of gehlenite (3Ca2Al2SiO7). Using synchrotron radiation X-ray fluorescence, the high concentration Ca boundaries revealed the appearance of gehlenite crystallisation, which was believed to contribute to development of denser microstructure and electrical conductivity.
Highlights
The microstructure of the fly ash, kaolin, slag geopolymers subjected to the sintering
2a) showed there was an incomplete dissolution of the fly ash
SG900 was increased by 47.9%, compared to the geopolymers
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Ordinary Portland Cement (OPC) allows sufficient thermal stability for most typical applications. At elevated temperatures, the properties of OPC fall off due to physical and chemical changes [1]. Several studies were conducted to identify an alternative material which possesses outstanding thermal stability and fire resistance in elevated temperature.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
