Abstract
In order to reduce ammonia gas emissions from concrete, we investigated experimentally the mechanism of ammonia gas emission and the methods of reducing the gas emission rate from concrete. As a result, it was observed that the ammonia-causative materials in concrete were blast furnace slag, lime stone and fly ash, (which are additives used in cement), gypsum (used for setting time control of cement) and nitrogen compounds on the surface of aggregates. The use of high-early-strength Portland cement, which contains little blast furnace slag, lime stone and fly ash, and aggregates which have had nitrogen compounds removed from their surfaces enables ammonia gas emission to decrease to about 1/10.
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