Ammonia Generation from Concrete and Countermeasures
By K. Kobayashi
Concrete Jouranl, Vol. 38, No. 11, Nov. 2000
- Synopsis
- Ammonia generated from concrete causes discoloration of cultural assets accomodated in storage vaults of art museums. It is also a source of contamination in clean rooms where semiconductors and liquid crystals are manufactured.
- The transitions in past research concerning ammonia gas generated from concrete are summarized in this paper. Based on information such as that generation of ammonia from concrete is caused by nitride existing in cement and aggregates, the raw materials of concrete, and foliated silicates like clay minerals and mica which contain ammonium inos, and that limestone does not contain ammonia generating substances, countermeasures against ammonia generation are proposed.
- Keywords:
- ammonia gas, concrete, discoloration of cultural assets, contamination of clean room, nitrogen compounds
