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http://dx.doi.org/10.5345/JKIBC.2017.17.1.023

Study on pH Reducing Method of Recycled Fine Aggregate for Embanking or Covering  

Han, Min-Cheol (Department of Architectural Engineering, Cheongju University)
Han, Dongyeop (Department of Architectural Engineering, Engineering Research Institute, Gyeongsang National University)
Publication Information
Journal of the Korea Institute of Building Construction / v.17, no.1, 2017 , pp. 23-30 More about this Journal
Abstract
The aim of the research is to suggest an economical and sustainable method of reducing pH of recycled aggregate as an embanking and a covering materials. Because of the unhydrated cement based materials on the surface of the recycled aggregate, it causes a severe problem on environment with leaked high alkali water from embankment and covering by using recycled aggregate. In this research, to reduce the pH of recycled aggregate, regarding the recycled fine aggregate, eight different methods were tested and analyzed with three different categorized: natural treatment, artificial treatment, and chemical treatment. From the results of experiment, it was considered that the most efficient method of reducing pH of recycled aggregate was the chemical treatment using acid such as $CO_2$ acceleration or monoammonium phosphate (MAP), and diammonium phosphate (DAP). Especially, using MAP and DAP, fertilizers, is the most efficient method of reducing pH with its time duration and performance.
Keywords
recycled fine aggregate; pH; alkali reducing method; unhydrated cement; acid;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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