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Thermal response of building stones contaminated with salts

Abstract : The accumulation of salts in building stones can lead to weathering features such as scaling, sanding oreven slab detachment. To detect salts in walls at the early stages and to predict their evolution, the non-destructive technique (NDT) Infrared Thermography (IRT) was tested in a stimulated way. The mainobjective was to trial this technique in order to obtain more information such as the type of salt, its pre-cise location and its concentration in building stones.Three building materials were studied, including two natural limestones and a reconstituted stone.Samples were submitted to immersion/drying tests in water and in salt solutions of Na2SO4, NaCl andMgSO4at 7%, 14% and 26% in weight during 20 cycles of 24 h. The weight of the samples and the surfacecolour were recorded after each cycle. After 1, 5, 10 and 15 cycles, 3 samples were taken out for active IRTmeasurements.The results showed that when the porosity and the capillarity are low, the intake of salts into the por-ous network is low and the thermal response of the stone to heating (DTmax) corresponds to the saltthermal signature and has no relation with concentration. On the other hand, when the initial porosityis high, salts crystallize inside the porous network and porosity decreases. Hence, the thermal responseof the porous stone is related to salt concentration and theDTmax increases until the stone starts to dis-aggregate.Active IRT is a promising NDT adapted to identify and quantify salts within building stones during thefirst states of accumulation.
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Submitted on : Tuesday, September 22, 2020 - 10:48:38 AM
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Céline Thomachot-Schneider, Patricia Vázquez, Maxime Gommeaux, Norman Lelarge, Alexandra Conreux, et al.. Thermal response of building stones contaminated with salts. Construction and Building Materials, Elsevier, 2019, 226, pp.331-344. ⟨10.1016/j.conbuildmat.2019.07.127⟩. ⟨hal-02945284⟩



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