Dispersion properties of fly ash–slag powders under the different environment

• Published in: Construction & building materials Vol. 296; p. 123649
• Main Authors: Zhang, Da-Wang, Zhao, Ke-Fei, Li, Hui, Wang, Dong-min, Wang, Lin-lin, Zhang, Guo-fang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 16.08.2021
• Subjects: Agglomerate structure; Fly ash-slag powder; NaOH; Waterglass; NaOH; Waterglass; Agglomerate structure; Fly ash-slag powder
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2021.123649

[Display omitted] •Geometrical property of solid particles was quantified studied.•Microstructure of pastes with different medium system was quantified investigated by G3 microscope.•High dissolution of raw materials is useful to improve the dispersion of fresh pastes. In this study, water, NaOH , and waterglass medium system are used to investigate the effect of different environment on the dispersion properties of fly ash-slag powder. Size distribution, Elongation, and Circularity of pastes was selected as the evaluate index to quantitatively investigate the dispersion properties of pastes by Morphologi G3 experiment. Results show that NaOH system has the highest size diameter of agglomerate structure with a diameter of 90–120 μm, followed by waterglass system, and finally water has the lowest size diameter. Square-like and long-chain structure with long elongation and low circularity are the mainly components in the active medium system (NaOH and waterglass). This is related to the early reaction of pastes, especially dissolution process. High dissolution speed of aluminosilicate is useful to formation of chain agglomerate structure due to the high electrostatic repulsion to increase the contact chance of particles and particles .