Microstructure and porosity evolution of alkali activated slag at various heating temperatures

Journal of Materials Research and Technology

M.A.A. Mohd Salleh¹  Sorachon Yoriya²  Ikmal Hakem Aziz²  Mohd Mustafa Al Bakri Abdullah²  Jitrin Chaiprapa³  Long Yuan Li⁴  Catleya Rojviriya⁴ 

[1] Corresponding author.;Center of Excellence Geopolymer and Green Technology, School of Materials Engineering, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, 01000, Kangar, Perlis, Malaysia;National Metal and Material Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), 114 Thailand Science Park, Pahonyothin Rd., Khlong 1, Khlong Luang, Pathum Thani, 12120, Thailand;Synchrotron Light Research Institute, Muang, Nakhon Ratchasima, 30000, Thailand;

关键词: Alkali activated slag;    Porosity;    Crystallisation;    Electron backscatter diffraction;   

DOI  :  

来源: DOAJ

【 摘 要 】

This paper elucidated the microstructural and porosity evolution of alkali activated slag at 800 °C up to 1200 °C. The microstructural analysis obtained shows the changes in surface densification of glassy phase and nucleation of dynamical grains within the alkali activated slag when in contact with high heating temperature. Using synchrotron radiation X-ray tomographic microscopy, the number of pores in alkali activated slag decreased with increasing heating temperature. The 3D pores distribution also demonstrated significant increase in the range size of ~20 μm with the appearance of isolated and intergranular pores at 1200 °C. These changes also led to the anorthite crystallisation indicated by high angle grain boundaries and preferred crystal orientation. The evolution of porosity and crystalline phase is contributed to the development of internal strain after heating at high temperature environment.

【 授权许可】

Unknown