Effect of silica fume on the mechanical property and hydration characteristic of alkali-activated municipal solid waste incinerator (MSWI) fly ash
Journal article, 2021

The incorporation of silica fume provides the solution to solve the low silica content of municipal solid waste incinerator fly ash, which hinders its utilisation in manufacturing alkali-activated solid waste incinerator fly ash. This paper reported the effect of silica fume and sodium silicate nature on the hardened properties, including compressive strength, hydration product and microstructure of alkali-activated municipal solid waste incinerator fly ash. In addition to characterising the property of municipal fly ash, the effect of silica fume in compressive strength of alkali-activated municipal solid waste incinerator fly ash under different sodium silicate dosage and modulus was investigated and its hydration products were determined by XRD and SEM. The results demonstrated that adding silica fume significantly improved the compressive strength by promoting the formation of C–S–H hydration product. Moreover, a higher sodium silicate content and modulus resulted in a higher compressive strength. The concentration of leachable heavy metals from harden specimen with 10% SF specimen was significantly reduced to the value which is much lower than the recommendation from Chinese standards.

Alkali-activated cementitious material

MSWI fly Ash

Strength

Silica fume

Author

Jun Ren

Harbin Institute of Technology

Shenzhen University

Lu Hu

Shenzhen University

Zhijun Dong

ShenZhen Institute of Information Technology

Luping Tang

Chalmers, Architecture and Civil Engineering, Building Technology

Feng Xing

Shenzhen University

Jun Liu

Shenzhen University

Journal of Cleaner Production

0959-6526 (ISSN)

Vol. 295 126317

Subject Categories

Other Chemical Engineering

Bioenergy

DOI

10.1016/j.jclepro.2021.126317

More information

Latest update

3/17/2021