Pore solution composition of alkali-activated slag/fly ash pastes
By Yibing Zuo, M. Nedeljković, Guang Ye. Cement and Concrete Research, 2019
247 citations recorded by the source corpus.
Abstract The pore solutions of a series of hardened alkali-activated slag/fly ash pastes were extracted by the steel-die method, and analyzed using ICP-OES analysis technique. According to the saturation index from thermodynamic calculations, the pore solutions of alkali-activated slag pastes kept oversaturated with respect to solid reaction products with time. In the pore solutions of alkali-activated fly ash pastes, an increase of temperature (from 40 °C to 60 °C) led to decreases of the concentrations of Si, Al, Ca, Na, OH−, K, Fe and Mg, while the soluble silicate in the alkaline activator resulted in increases of the concentrations of these elements. Compared to the alkali-activated slag paste with the same alkaline activator, 50% replacement of slag by fly ash did not result in a substantial change of the pore solution composition. Based on the experimental results, conceptual models were proposed to describe the elemental concentrations in the pore solutions.
Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/dbb6f15243f58bb3f460b76fab44ca3f67f643be
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Citations in the corpus
- Fracture properties and microstructure formation of hardened alkali-activated slag/fly ash pastes (2021, background): “The slag, on the other hand, has mainly amorphous phases (>95%) [19].”
- Mechanisms of autogenous shrinkage of alkali-activated slag and fly ash pastes (2020, background): “For example, the concentration of SiO3 in similar AAM systems decreases from>2 M to 100–200 mM according to [48,82].”