TY - JOUR

T1 - External magnesium sulfate attack on hydrated Portland-limestone cements: Effect of the concurrent presence of sodium chloride in the corrosive environment and metakaolin admixture in the binder

AU - Sotiriadis, Konstantinos

AU - Мазур, Антон Станиславович

AU - Толстой, Петр Михайлович

AU - Mácová, Petra

AU - Viani, Alberto

PY - 2024/8/1

Y1 - 2024/8/1

N2 - Magnesium sulfate attack on Portland-limestone cement pastes at low temperature was investigated considering the concurrent presence of sodium chloride in the corrosive solution. The common deterioration mechanism, involving leaching of portlandite and C─(A─)S─H phase and formation of crystalline phases and amorphous cross-linked aluminosilicate structures, was mitigated in the pastes made from ordinary or Portland-limestone cements by increasing amounts of dissolved sodium chloride. Conversely, it was intensified in the blend with metakaolin by the additional decomposition of C─A─H phases with the formation of amorphous aluminate hydrate. The reduced cross-linking of the aluminosilicate structures is attributed to the structural association of sodium in the low-Ca/Si chains. C─A─H phase was also consumed in the heavily deteriorated cement paste with the highest limestone content. The mitigating effect of sodium chloride is proposed to be due to the corrosive environment's reduced acidity and the protective effect exerted by the sodium ions absorbed at the surface of aluminosilicate structures.

AB - Magnesium sulfate attack on Portland-limestone cement pastes at low temperature was investigated considering the concurrent presence of sodium chloride in the corrosive solution. The common deterioration mechanism, involving leaching of portlandite and C─(A─)S─H phase and formation of crystalline phases and amorphous cross-linked aluminosilicate structures, was mitigated in the pastes made from ordinary or Portland-limestone cements by increasing amounts of dissolved sodium chloride. Conversely, it was intensified in the blend with metakaolin by the additional decomposition of C─A─H phases with the formation of amorphous aluminate hydrate. The reduced cross-linking of the aluminosilicate structures is attributed to the structural association of sodium in the low-Ca/Si chains. C─A─H phase was also consumed in the heavily deteriorated cement paste with the highest limestone content. The mitigating effect of sodium chloride is proposed to be due to the corrosive environment's reduced acidity and the protective effect exerted by the sodium ions absorbed at the surface of aluminosilicate structures.

KW - Chlorides

KW - Metakaolin

KW - Portland-limestone cement

KW - Solid-state NMR spectroscopy

KW - Thaumasite sulfate attack

UR - https://www.mendeley.com/catalogue/cf21f13c-a31d-3aac-a201-cbf552cd52b5/

U2 - 10.1016/j.cemconcomp.2024.105614

DO - 10.1016/j.cemconcomp.2024.105614

M3 - Article

VL - 151

JO - Cement and Concrete Composites

JF - Cement and Concrete Composites

SN - 0958-9465

M1 - 105614

ER -