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http://dx.doi.org/10.14190/JRCR.2015.3.4.366

Study on Performance of pH Reducing Agent Applied for Wet Process of Recycled Aggregate  

Choi, Jung-Gu (Department of Architectural Engineering, Korea National University of Transportation)
Lee, Gun-Cheol (Department of Architectural Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.3, no.4, 2015 , pp. 366-373 More about this Journal
Abstract
Construction waste is recycled and used for the efficient and eco-friendly disposal of construction waste increasing due to reconstruction and redevelopment project and so on. There is recycled aggregate as a typical case. And this recycled aggregate shows strong alkalinity due to calcium hydroxide, and causes many environmental problems. Therefore, this is a study on reduction in the strong alkalinity of recycled aggregate by using sodium phosphate based ammonium in order to reduce the pH of recycled aggregate. Besides, a possibility that a pH reducing agent of recycled aggregate could be applied to a site was evaluated. As a result, it was possible to verify that pH decreased as the percentage of pH reducing agent increased. It is thought that the pH reducing agent can be applied to a site by methods such as immersion and spray using the pH reducing agent in the process of producing recycled aggregates.
Keywords
Recycled aggregate; pH reducing agent; The first sodium phosphate; Ammonium chloride;
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  • Reference
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