characterize the type and depth of the infill, exploration holes are needed. If water is present in the subfloor of the structure, a structural engineer may need to be instructed, subject to the level of damage or movement to the walls. Remedial action The remedial action depends on the severity of the attack and on the risk related to its evolution. If repairs are required because of the extent of damages, often, the affected slab must be demolished and removed, the spoil should not be used as hardcore under the replacement slab. History and literature Sulfur has long been known to contribute to damage. This is true for many materials such as metal corrosion, or concrete degradation. In King Lear, Shakespeare says:There’s hell, there’s darkness, there is the sulphurous pit, Burning, scalding, stench, consumption; fie, fie, fie! See also Concrete degradation Pitting corrosion (effect of sulfur and sulfides) References Further reading Concrete