JIN Man-tong, CHEN Ying, DONG Hai-li, Chen Lin-wei, JIN Zan-fang

(College of Biological and Environmental Engineering, Zhejiang University of technology, Hangzhou 310014, China)

Abstract: In order to discuss the resistance to seawater erosion with geopolymer solidification MSWI fly ash, the research analyzed the influence of seawater erosion by studying the change of mass, compressive strength and leaching concentration. The results showed that geopolymer had a high resistance to seawater erosion: after 240 days, weight loss changed within 2.5% and the compressive strength reached 42.36 MPa. The leaching concentration of Cr, Cu, Zn, Cd, Hg, and Pb were 32.84, 21.27, 8.36, 0.07, 0.17 and 1.75 μg/L, respectively. The scales of decrease were 90.0%, 73.7%, 77.9%, 86.48%, 85.0% and 94.3%, respectively. XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), TG-DTA (thermal gravity and differential thermal analysis) and SEM (scanning electron microscope) studies were carried out to identify microstructure of the geopolymer. The results showed that the structure of the geopolymer was not damaged by seawater.

Key words: geopolymer solidification MSWI fly ash; seawater erosion; weight change; compressive strength; leaching concentration; microstructure

ACTA MINERALOGICA SINICA Vol. 34, No. 2, 2014, Page 159-165