Salt Weathering - Lab Clip 3 - 65% RH, 20 C


Keywords:  Concentrated Sodium Sulfate solution, Laboratory Time-Lapse, rising damp

For additional information see:

For setup details see Rodrigues-Navarro and Doehne, 1999

From subfluorescence to efflorescence. In this example, we can dramatically change the location of crystallization from subsurface to surface simply by changing the RH from 43% to 65% RH and then holding the RH and Temperature constant. Yes, behind the efflorescence there is the same stone column sitting in a solution of sodium sulfate covered by wax, the salt being extruded and growing from the pores where the stone surface meets the saturated solution.

Carlos Rodriguez-Navarro & Eric Doehne