Durability of MgO/hydromagnesite mortars – Resistance to chlorides and corrosion
arxiv(2024)
摘要
The durability of MgO/hydromagnesite mortars was studied with respect to
their corrosion performance and resistance to chloride attack and moisture.
MgO/hydromagnesite pastes were cured in chloride solution to induce potential
formation of Mg-chlorides; however, no such phases were observed. Rapid
chloride ingress measurements demonstrated high penetration resistance and low
chloride migration coefficients, i.e. D_Cl = 1e-13 to 1e-12 m^2/s. The
corrosion rate of carbon steel embedded in MgO/HY mortars, as determined by
linear polarization resistance measurements, was in the range icorr = 1e-9
A/cm^2 in dry and 1e-7 A/cm^2 in wet conditions, irrespective of the mortar
composition or curing condition.These findings corroborate the hypothesis that,
in the absence of chlorides, the moisture condition is the primary predictor of
corrosion rate of carbon steel in the MgO/hydromagnesite binder. These
accelerated, short-term experiments suggest that the binder may be suited to
protect embedded carbon steel from corrosion under specific exposure conditions
of practical relevance.
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