Chalking
Lime blowing is a harmful reaction that destroys concrete . This chemical reaction is mostly due to an incorrectly composed cement , namely when there is more calcium oxide in the cement than can be bound by silica , aluminum oxide and iron oxide .
This free, unbound lime, which is embedded in a dense structure of minerals , reacts very slowly with water; this reaction is not yet complete even when the cement has already solidified. There is an increase in volume, comparable to the slaking of the lime, whereby the cementitious structure is worn down.
Individual evidence
- ↑ State Institute for Environmental Protection BW (Ed.): Building material corrosion during construction work on old deposits and old sites. Karlsruhe 1990, pp. 3–5, online (accessed August 3, 2018).
- ↑ Construction chemistry and building materials Chemistry and properties of mineral building materials and binders. (accessed on August 3, 2018)
Web links
- Structural damage caused by mineral driving phenomena (accessed on August 3, 2018)
- Damage pictures (accessed on August 3, 2018)