The Effect of Ordinary Portland Cement Substitution on the Thermal Stability of Geopolymer Concrete

Materials

Prabir Kumar Sarker¹  Lang Li²  Tao Long²  Xiaoshuang Shi²  Qingyuan Wang²  Hongen Zhang²  Gaochuang Cai³ 

[1] Department of Civil Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), School of Architecture and Environment, Sichuan University, Chengdu 610065, China;Laboratoire de Tribologie et de Dynamique des Systèmes (LTDS), Ecole Nationale d’Ingénieurs de Saint-Etienne (ENISE), University de Lyon, UMR 5513, 58 Rue Jean Parot, 42023 Saint-Etienne, France;

关键词: elevated temperatures;    residual compressive strength;    mass loss ratio;    geopolymer concrete;    secondary geopolymerization;   

DOI  :  10.3390/ma12162501

来源: DOAJ

【 摘 要 】

The influence of using cement on the residual properties of fly ash geopolymer concrete (FAGC) after exposure to high temperature of up to 800 °C was studied in terms of mass loss, residual compressive strength and microstructure. The mass loss was found to increase with the increase of exposure temperature, which is attributed to vaporization of water and dehydroxylation of sodium aluminosilicate hydrate (N-A-S-H) gels. The dehydroxylation of calcium silicate hydrate (C-S-H) gels and the disintegration of portlandite were responsible for higher mass loss ratio of FAGCs containing cement. The results showed that cement could increase compressive strength of FAGCs up to 200 °C, after which a significant reduction in residual strength was observed. It was found that FAGCs without cement yielded higher residual strength than the original strength after heating up to 600 °C. The observed increase of compressive strength up to 200 °C was attributed to the secondary geopolymerization which was evidenced in the scanning electronic microscopy (SEM) images.

【 授权许可】

Unknown