Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Emission characteristic of ammonia in cement mortars using different sand from area of production

  • Jang, Hongseok (Department of Architectural Engineering, Chonbuk National University) ;
  • So, Hyoungseok (Department of Architectural Engineering, Seonam University) ;
  • So, Seungyoung (Research Center of Industrial Technology, Department of Architectural Engineering, Chonbuk National University)
  • Received : 2015.11.24
  • Accepted : 2016.04.08
  • Published : 2016.09.30
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Abstract

This paper discusses the influence of organic matter contained in aggregate on the emission characteristic of ammonia ($NH_3$) from cement mortar. $NH_3$ can be released to indoor-outdoor environment through diffusion in mortar (or concrete) and have resulted in the increasing air pollution, and especially well known as a harmful gas for the human body. The concentration of $NH_3$ released from cement concrete was then compared to the contents of organic matter contained in the aggregate. The result indicates that the contents of organic matter in the aggregate significantly differ with types of aggregate from different areas of production. The organic matter becomes organic nitrogen through the process of microbial breakdown for a certain period and pure ammonium ion ($NH_4{^+}$) is produced from the organic nitrogen. The $NH_4{^+}$ was reacted with alkaline elements in the cement and released as $NH_3$ from cement concrete through a volatile process. The released $NH_3$ was proportional to the contents of $NH_4{^+}$ adsorbed in the aggregate from different areas of production and the concentrations of $NH_3$ emission from cement mortar according to the aggregate differ by more than 4 times.

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References

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