https://orcid.org/0000-0003-0944-5850
Abstract
In order to obtain the influence of mineral admixtures such as fly ash and slag on the leaching resistance of cement-based materials in water environments, a conventional leaching experiment on the slice specimens with pure, binary, and ternary cement pastes immersed into deionized water was performed. The dissolved calcium concentration, porosity, microstructure, calcium–silicon ratio (Ca/Si), and phase composition of the specimens were characterized by using ethylene diamine tetraacetic acid titration, saturation-drying weighing, scanning electron microscopy, energy dispersive spectrometry, and X ray diffraction analysis. Results show that more fly ash mixed in the blended cement paste results in lesser dissolved calcium concentration in the solution, slower microstructure deterioration, lower porosity increment, and smaller Ca/Si decrease, while the optimum content of fly ash is 40 %. The partial replacement of fly ash with slag in the binary cement paste can improve its microstructure and slow down its leaching process. The ternary cement paste with 20 % fly ash and 20 % slag has an optimum leaching resistance exposed to deionized water.
Issue Section:
Technical Papers
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