Performance of limestone laden with sodium sulphate and sodium nitrate

H. De Clercq, M. Jovanovic, S. Hendrickx, Y. Vanhellemont, S. Roels, M. Steiger & K. Linnow
The behaviour of two types of limestones, having different porosity: Maastrichter and Euville,laden with an aqueous solution of an equimolar mixture of sodium sulphate and sodium nitratewas investigated. At 50% RH, the efflorescence on Maastrichter samples drying up to 30 hoursconsisted of similar amounts of thenardite and darapskite in case of an equimolar mixture ofsodium sulphate/sodium nitrate while that on Euville samples under the same conditionscontained mainly darapskite. At 20°C and 85% RH, thenardite was...