Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Recycling of Slightly Contaminated Demolition Waste—Part 2: PAH
https://orcid.org/http://orcid.org/0000-0003-4743-4079
https://orcid.org/http://orcid.org/0000-0002-9950-5046
For the purposes of environmental protection, resource efficiency and to foster a sustainable development it is advisable to recycle also slightly contaminated CDW and keep it from ending up in landfills. A high-quality option is the use as aggregate for concretes (RCA). In doing so, it must be guaranteed, that no harms for health and environment are caused by potential emissions. The use of crushed demolition waste as a concrete aggregate is technically state-of-the-art. Investigations on the leaching behaviour of recycled concrete showed a good integration of inorganic contaminants. However, PAH were found to be leached in noticeable amounts even for moderately contaminated CDW, complying with the German threshold of 25 mg/kg for RCA. For this contribution different test specimens, containing moderately PAH-contaminated aggregates, were tested in leaching tests following DIN CEN/TS 16637-2. The results were evaluated according to the current German evaluation procedure and compared to limit values for PAH in groundwater. PAH leaching from concrete proved to be a relevant issue, the permitted release of 0.22 mg/m2 and therefore the threshold for groundwater was exceeded in many cases. The PAH content of the recycled aggregate was no suitable indicator for an environmental compatible concrete, the most determining factor, besides the total aggregate amount added, is the contaminated fines share.
Recycling of Slightly Contaminated Demolition Waste—Part 2: PAH
https://orcid.org/http://orcid.org/0000-0003-4743-4079
https://orcid.org/http://orcid.org/0000-0002-9950-5046
For the purposes of environmental protection, resource efficiency and to foster a sustainable development it is advisable to recycle also slightly contaminated CDW and keep it from ending up in landfills. A high-quality option is the use as aggregate for concretes (RCA). In doing so, it must be guaranteed, that no harms for health and environment are caused by potential emissions. The use of crushed demolition waste as a concrete aggregate is technically state-of-the-art. Investigations on the leaching behaviour of recycled concrete showed a good integration of inorganic contaminants. However, PAH were found to be leached in noticeable amounts even for moderately contaminated CDW, complying with the German threshold of 25 mg/kg for RCA. For this contribution different test specimens, containing moderately PAH-contaminated aggregates, were tested in leaching tests following DIN CEN/TS 16637-2. The results were evaluated according to the current German evaluation procedure and compared to limit values for PAH in groundwater. PAH leaching from concrete proved to be a relevant issue, the permitted release of 0.22 mg/m2 and therefore the threshold for groundwater was exceeded in many cases. The PAH content of the recycled aggregate was no suitable indicator for an environmental compatible concrete, the most determining factor, besides the total aggregate amount added, is the contaminated fines share.
Recycling of Slightly Contaminated Demolition Waste—Part 2: PAH
https://orcid.org/http://orcid.org/0000-0003-4743-4079
https://orcid.org/http://orcid.org/0000-0002-9950-5046
For the purposes of environmental protection, resource efficiency and to foster a sustainable development it is advisable to recycle also slightly contaminated CDW and keep it from ending up in landfills. A high-quality option is the use as aggregate for concretes (RCA). In doing so, it must be guaranteed, that no harms for health and environment are caused by potential emissions. The use of crushed demolition waste as a concrete aggregate is technically state-of-the-art. Investigations on the leaching behaviour of recycled concrete showed a good integration of inorganic contaminants. However, PAH were found to be leached in noticeable amounts even for moderately contaminated CDW, complying with the German threshold of 25 mg/kg for RCA. For this contribution different test specimens, containing moderately PAH-contaminated aggregates, were tested in leaching tests following DIN CEN/TS 16637-2. The results were evaluated according to the current German evaluation procedure and compared to limit values for PAH in groundwater. PAH leaching from concrete proved to be a relevant issue, the permitted release of 0.22 mg/m2 and therefore the threshold for groundwater was exceeded in many cases. The PAH content of the recycled aggregate was no suitable indicator for an environmental compatible concrete, the most determining factor, besides the total aggregate amount added, is the contaminated fines share.
Recycling of Slightly Contaminated Demolition Waste—Part 2: PAH
RILEM Bookseries
M.C.F. Cunha, Vítor (Herausgeber:in) / Rezazadeh, Mohammadali (Herausgeber:in) / Gowda, Chandan (Herausgeber:in) / Weiler, Lia (Autor:in) / Vollpracht, Anya (Autor:in)
RILEM Spring Convention and Conference ; 2020 ; Guimarães, Portugal
Proceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020) ; Kapitel: 8 ; 75-86
RILEM Bookseries ; 35
14.07.2021
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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