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A much more caustic environment but I did a chiller replacement job in a hospital where the existing absorption chillers used lithium bromide as the refrigerant. The chillers were poorly maintained and had been leaking for years, more likely decades.
When we saw signs of concrete decay under them, we started investigating.
While probing the concrete directly under one of the chillers, the crowbar punched right through the 8” concrete slab under it’s own weight.
When we finished removing the decayed concrete, there was a 30’ x 40’ hole before we got to something we could build back on.
We sometimes take concrete for granted but it’s not the forever material we often think it to be. Much older concrete that was made before the science was well understood was often over designed.
These newer buildings constructed on the cheap and poorly maintained that went up when the science was understood by the designers, allowing more efficient designs but the skill not available in the workers are worrisome.
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