[HTT21-P04] A laboratory experiment on stone decay by combination of salt and ice crystallization
Keywords:alt weathering, frost weathering, freeze-thaw, surface hardness, longitudinal wave velocity, surface expansion
The specimens immersed in saturated salt solutions showed greater weight losses, reductions in Equotip rebound value and longitudinal wave velocity and surface expansion than those immersed in distilled water. Saturated solution of magnesium sulfate induced the greatest damage on rock specimens, although magnesium sulfate has been regarded as an inactive salt in the previous freeze-thaw experiments in which rock specimen were partly immersed in salt solution with dilute or mild concentration. Sodium sulfate induced rock damages comparable with sodium chloride. Sodium and magnesium sulfate crystallized from saturated solution and induced rock expansion prior to freezing. These salt crystals may fill micro-pores in rock and facilitates rock expansion and breakdown due to freezing.