Aidan O’ Connell & Associates
What is Pyrite?
Pyrite or Iron Pyrite (FeS2) is a very common mineral that is present in many sedimentary rocks as framboidal crystals. Subject to certain conditions, pyrite is problematic in confined construction, such as under floor filling and within blockwork. This is due to a chemical reaction that can cause pyrite to swell.
Construction material containing relatively large amounts of pyrite minerals are likely to expand, crack and/or crumble over time. This occurs when framboidal crystalline pyrite, air and moisture, mix causing a chemical reaction to occur that creates expanding crystals within the material.
What is MICA?
Why is Pyrite & Mica a problem within blockwork?
What are the tell-tale signs of Mica damage?
- Render falling off
- External wall cracking
- The crumbling of the concrete blockwork in the external walls
- Concrete block outer leaf moved away from window frames
set into the wall, thus restricting their operational use
- Vertical cracks at external corners
- Crazy paving type cracking