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- Title
Study on mechanism of solid waste cementitious material based on rheological properties of fly ash.
- Authors
ZHANG Jianjun; WANG Baoqiang; CAI Jiqi; JIANG Yingjie; RAN Jiaying
- Abstract
In order to study the cementitious material suitable for high concentration waste tailings mortar backfill, the rheological properties of mortar under different fly ash content were tested by the expansion degree test, and the applicability of the test method was analyzed. The results indicate that the correlation between the degree of expansion and the L-tube model test is 0.985, indicating that the degree of expansion can be used as a pre test for L-tube to synergistically characterize the rheological properties of mortar. The yield stress of the mortar mixed with 10% fly ash decreases by 13.06%--24.74%, the strength increases by 40% in 3 days, and 9. 9% in 7 days, fully exerting the comprehensive effect of solid waste. As the content of fly ash gradually increases, the ion concentration of the slurry gradually decreases, leading to an increase in the repulsive force between the cementitious particles and more dispersed particles. At the same time, the cumulative amount of 3 d hydration heat release of the slurry with a 10% content of fly ash is 261.696 J/g, which increases by 2.9%, and the porosity decreases by 4.02% by 15.15%. The "rolling ball" characteristic of fly ash to some extent improves its flowability and enhances the strength of the hardened body.
- Publication
Journal of Functional Materials / Gongneng Cailiao, 2023, Vol 54, Issue 12, p12154
- ISSN
1001-9731
- Publication type
Article
- DOI
10.3969/j.issn.1001-9731.2023.12.021