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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Durability of Magnesia-Phosphate Grouts in Sulfate Solutions
Author(s): J. Pera, E. Soudee, and J. Ambroise
Publication: Special Publication
Appears on pages(s): 341-352
Keywords: ammonium sulfate; durability; magnesia-phosphate cement; magnesium sulfate; schertelite; struvite
Abstract:Two different magnesia powders (MgO) were used to prepare magnesia-phos- phate cements in combination with equal quantities of mono-ammonium phosphate (NH4H2PO4 or MAP). Two grouts containing 5O% of each magnesia-phosphate cement and 50% Class F fly ash were prepared at a water to solids ratio of 0.25 and submitted to three wetting-drying cycles in the following solutions: - de-ionized water, - 20% ammonium sulfate solution - 20% magnesium sulfate solution Each cycle was composed of four weeks of immersion and one week of drying at 20°C. The samples were subjected to the following investigations: mass loss, compressive strength, and microstructure (X-ray diffraction, scanning electron microscopy and differential thermal analysis). The results obtained show a very good behavior of these grouts in magnesium sulfate solution. Their behavior in ammonium sulfate solution depend upon the initial porosity of the grout: expansive schertelite appears and develops without disorder when the grout is very porous. When the porosity is limited, the grout disintegrates after three cycles in the aggressive solution.
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