Chemical and Ecotoxicological Long-Term Behaviour of New Materials for Quarry Back-Filling and Underground Constructions

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The main aim of the Valomat project was the development of new materials for quarry back-filling and underground constructions, based on the reuse of bottom ashes from MSWI. Bottom ashes were collected in six incineration plants of Europe. Some of them were selected for the development of new materials. One task of this project comprised the study of the long-term behavior of new materials, under simulated conditions of environmental exposure. Three different scenarios were studied. For each scenario, a pilot plant was constructed and the new materials were studied under laboratory conditions or natural weather. The long-term behavior of these materials was assessed through the characterization of chemical and ecotoxicological properties of the leachates.The chemical contamination and the ecotoxicological levels of the leachates were relatively low, although different levels had been determined for the three different scenarios. The immersion in dechlorinated tap water (scenario S1) had shown the highest emission levels of chlorides, sulphates, DOC, and Al, especially for the materials B2/1 and B2/2. The lowest ecotoxicological and chemical levels were determined in the scenario in which the materials were buried in a sieved soil.
Original languageEnglish
Title of host publicationInternational RILEM Conference on the Use of Recycled Materials in Building and Structures
EditorsE. Vázquez, Ch F. Hendriks, G. M. T. Janssen
Place of PublicationCatalunha
Number of pages10
ISBN (Print)2-912143-53-5
Publication statusPublished - 2004


  • MSWI bottom ashes
  • New materials
  • Quarry back-filling
  • Underground constructions
  • Chemical and ecotoxicological long-term behaviour


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