Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Manufacture of concrete blocks from lead-bearing waste
A secondary lead smelter slag has been used in a cement based stabilization/solidification process for the manufacture of concrete blocks. The influence of the lead slag on the hydration chemistry has been studied by means of cementitious mixtures containing up to 65 % powdered slag. The results have shown that the hydration chemistry is not negatively influenced from both the qualitative and quantitative points of view, provided that the lead slag content is within 30 %. Concrete blocks containing 15 % cement have been produced by partial substitution of the whole aggregate and each differently sized aggregate class. The maximum amount of substitution was 22 %. Blocks of unconfined compressive strength ranging between 23.0 and 25.6 MPa can be produced in this way. The feasibility of the stabilization process has been tested by means of two dynamic leaching tests making use of a CO2-saturated solution and distilled water. The duration of the tests was extended up to 32 days to get information on the long term behaviour of the stabilized products. To this regard, it has been found that lead is released in cumulative amounts of the order of a few parts per million and that the resistance to lead diffusion is high.
Manufacture of concrete blocks from lead-bearing waste
A secondary lead smelter slag has been used in a cement based stabilization/solidification process for the manufacture of concrete blocks. The influence of the lead slag on the hydration chemistry has been studied by means of cementitious mixtures containing up to 65 % powdered slag. The results have shown that the hydration chemistry is not negatively influenced from both the qualitative and quantitative points of view, provided that the lead slag content is within 30 %. Concrete blocks containing 15 % cement have been produced by partial substitution of the whole aggregate and each differently sized aggregate class. The maximum amount of substitution was 22 %. Blocks of unconfined compressive strength ranging between 23.0 and 25.6 MPa can be produced in this way. The feasibility of the stabilization process has been tested by means of two dynamic leaching tests making use of a CO2-saturated solution and distilled water. The duration of the tests was extended up to 32 days to get information on the long term behaviour of the stabilized products. To this regard, it has been found that lead is released in cumulative amounts of the order of a few parts per million and that the resistance to lead diffusion is high.
Manufacture of concrete blocks from lead-bearing waste
Herstellung von Betonblöcken aus bleihaltigem Abfall
Cioffi, R. (Autor:in) / Marroccoli, M. (Autor:in) / Lavorgna, M. (Autor:in) / Santoro, L. (Autor:in)
2001
9 Seiten, 4 Bilder, 4 Tabellen, 12 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Reuse of secondary lead smelter slag in the manufacture of concrete blocks
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