Comparative mechanical and microstructural properties of high calcium fly ash one-part geopolymers activated with Na2SiO3-anhydrous and NaAlO2

Journal of Materials Research and Technology

Long-Yuan Li¹  Liew Yun-Ming²  Ng Hui-Teng²  Mohd Mustafa Al Bakri Abdullah²  Foo Kai Loong³  Nur Ain Jaya⁴  Ooi Wan-En⁵  Heah Cheng-Yong⁵  Li Ngee Ho⁵  Ong Shee-Ween⁵  Ng Yong-Sing⁶ 

[1] Corresponding author.;Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis (UniMAP), 01000 Perlis, Malaysia;Faculty of Mechanical Engineering Technology, Universiti Malaysia Perlis (UniMAP), 01000 Perlis, Malaysia;Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis (UniMAP), 01000 Perlis, Malaysia;Geopolymer and Green Technology, Centre of Excellence (CEGeoGTech), Universiti Malaysia Perlis (UniMAP), 01000 Perlis, Malaysia;School of Engineering, Computing and Mathematics, Plymouth University, Drake Circus Plymouth, Devon PL4 8AA, United Kingdom;

关键词: One-part geopolymer;    High calcium fly ash;    Sodium aluminate;    Anhydrous sodium metasilicate;   

DOI  :  

来源: DOAJ

【 摘 要 】

This paper investigates the effect of varying solid alkali activators on the fresh and hardened properties and microstructural changes of one-part geopolymers (OPGs). Single and binary solid alkali activators were used to activate high calcium fly ash. The alkali activators were either solely sodium metasilicate (Na2SiO3) or a combination of sodium aluminate (NaAlO2) and sodium metasilicate (Na2SiO3). The OPG activated with anhydrous Na2SiO3 achieved an excellent 28-day compressive strength of 83.6 MPa while OPG activated with NaAlO2 and Na2SiO3 attained a compressive strength of 45.1 MPa. The Na2SiO3-activated OPG demonstrated better fluidity than the OPG activated with NaAlO2 and Na2SiO3 due to the thixotropic behaviour caused by the NaAlO2. The Na2SiO3-activated OPG consisted of sodium-calcium aluminium silicate hydrate ((N,C)-A-S-H) gel phase, while the OPG activated with NaAlO2 and Na2SiO3 comprised of the coexistence of sodium aluminium silicate hydrate (N-A-S-H) and calcium aluminium silicate hydrate (C-A-S-H) gel phases. Regardless of the distinctive properties, the OPGs are adequate for building materials applications.

【 授权许可】

Unknown