Shehata, "Mineralogical and chemical assessment of concrete damaged by the oxidation of sulfide-bearing aggregates: Importance of
thaumasite formation on reaction mechanisms," Cement and Concrete Research, vol.
[19] have shown that the concrete of Yongan Dam is deteriorated due to the
thaumasite form of sulphate attack, according to microanalytical investigations, SEM and energy disperse X-ray (EDX).
--The presence of calcium hydroxide, calcium carbonate in the form of calcite, gypsum, clay, calcium carbonate, calcium silicates and
thaumasite (XRD test)
The chemical reaction between the fine particle cement and quick setting agent dramatically increases the particle concentration and viscosity of the mixture after mixing due to the generation of ettringite (hydrated calcium aluminum sulfate hydroxide),
thaumasite, and alite (tricalcium silicate).
Some authors [6] describe
thaumasite as hydration product of Portland cement clinker minerals and limestone constituents.
From the Komsomol mine: clusters of green ktenasite microcrystals; acicular tufts of white
thaumasite; tabular apophyllite crystals to 5 cm, some of them water-clear or showing growth zones; transparent, rhombohedral crystals of calcite in clusters to 5 cm; white okenite "puff balls" to 6 mm; attractive clusters of orange stilbite crystals to 6 cm; clusters of attractive pink laumontite to 6 mm; and sharp, lustrous pyrite crystals on pink apophyllite-encrusted matrix to 8 cm across.
Thaumasite sulphate attack at the concrete structures of the Ference Puskas stadium in Budapest.