Properties and hydrates of seawater-mixed magnesium potassium phosphate cements with high magnesium-to-phosphate ratio

Xu, Biwan; Lothenbach, Barbara; Li, Zongjin

doi:10.1016/j.cemconcomp.2022.104807

Cited by 12 publications

(1 citation statement)

References 47 publications

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“…The ingress of seawater into cement leads to the conversion or replacement of monocarbonate with Friedel's salt, along with the removal of typical solid hydrate phases, such as C-S-H, portlandite, ettringite, etc., with a corresponding decrease in solid volume [15][16][17][18][19]. These phases are replaced with Friedel salt, Magnesium Silicate Hydrate (M-S-H), and the re-precipitation of brucite.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Modelling of Harsh Environments on the Solid Phase Assemblage of Hydrating Cements Using PHREEQC

2022

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Poor durability of reinforced concrete structures can lead to serious structural failures. An accurate model to observe the effects of aggressive agents like carbonation, sulfate ingress, and seawater solutions on the solid phase assemblage will help designers and specifiers better understand how cement behaves in these environments. This paper presents the first steps in developing such a model using the PHREEQC geochemical software by accounting for alkali binding and dissolution. It also presents the use of discrete solid phases (DSPs) to account for the solid-solution behaviour of siliceous hydrogarnet and magnesium silicate hydrate (M-S-H). A new thermodynamic description of the vaterite phase has also been developed for this work using the cemdata18 thermodynamic database. The predicted phase assemblages of cements in these environments here agree with previously published findings using a different thermodynamic model supported with experimental data.

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