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Secondary building materials from construction and demolition waste: environmental benefits and costs

  • Due to the large quantities of construction and demolition waste (CDW) in Europe, its reuse or recycling is of particular importance. Although several countries already recycle high amounts of CDW, the use as secondary raw materials is often limited by inferior building material properties. Specific characteristics, like high porosity and low density are caused by hardened cement paste in crushed concrete and the content of mortar and plaster in brick debris. Impurities like wood or gypsum and also harmful substances like organic pollutants may be a major problem for a reuse and should be minimized. Therefore unwanted materials and impairing substances have to be separated from the secondary building material stream. This can be done during the demolition process by using techniques for selective dismantling or during the subsequent treatment of the resulting rubble. Since almost all processing steps are associated with environmental impacts, the benefits of saving natural resources byDue to the large quantities of construction and demolition waste (CDW) in Europe, its reuse or recycling is of particular importance. Although several countries already recycle high amounts of CDW, the use as secondary raw materials is often limited by inferior building material properties. Specific characteristics, like high porosity and low density are caused by hardened cement paste in crushed concrete and the content of mortar and plaster in brick debris. Impurities like wood or gypsum and also harmful substances like organic pollutants may be a major problem for a reuse and should be minimized. Therefore unwanted materials and impairing substances have to be separated from the secondary building material stream. This can be done during the demolition process by using techniques for selective dismantling or during the subsequent treatment of the resulting rubble. Since almost all processing steps are associated with environmental impacts, the benefits of saving natural resources by applying secondary building materials should be weighed carefully. An environmental performance evaluation was undertaken to assess different techniques for reducing gypsum in recycled concrete aggregates, aiming at a minimization of elutable sulfates. These results were compared to the environmental impacts of the extraction of natural aggregates for concrete.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Karin Weimann, Christian Adam
Persönliche Herausgeber/innen:Isabel Martins, Carina Ulsen, Sergio Cirelli Angulo
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Progress of recycling in the built environment
Jahr der Erstveröffentlichung:2015
Organisationseinheit der BAM:4 Material und Umwelt
4 Material und Umwelt / 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung
Herausgeber (Institution):RILEM publications SARL
Verlagsort:Paris, France
Erste Seite:192
Letzte Seite:199
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Bauschuttaufbereitung; CDW processing; Demolition/selective dismantling; Environmental evaluation; Gypsum; Ökobilanzielle Bewertung
Themenfelder/Aktivitätsfelder der BAM:Umwelt
Umwelt / Ressourcenrückgewinnung und Materialverwertung
Veranstaltung:"Progress of recycling in the built environment"
Veranstaltungsort:Sao Paulo, Brazil
Beginndatum der Veranstaltung:03.08.2015
Enddatum der Veranstaltung:05.08.2015
URL:http://www.rilem.org/gene/main.php?base=500218&id_publication=449&id_papier=10699
ISBN:e-ISBN: 978-2-35158-158-2
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:10.11.2016
Referierte Publikation:Nein