A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Leaching and mechanical behaviour of concrete manufactured with recycled aggregates
The reuse of debris from building demolition is of increasing public interest because it decreases the volume of material to be disposed to landfill. A focus is on the evaluation of the possibility of reusing recycled aggregate from construction or demolition waste as a substitute for natural aggregate in concrete production. In most applications, cement based materials are used for building construction due to their cost effectiveness and performance; however their impact on the surrounding environment should be monitored. The interstitial pore fluid in contact with hydrated cementitious materials is characterized by persistent alkaline pH values buffered by the presence of hydrate calcium silicate, portlandite and alkaline ions. An experimental plan was carried out to investigate concrete structural properties in relation to alkali release in aqueous solution. Results indicate that the presence of recycled aggregate increases the leachability of unreactive ions Na, K, Cl, while for calcium the substitution resulted in a lower net leaching. In spite of the lower mechanical resistance, 40 % less, such a waste concrete may be suggested as more environmentally sustainable.
Leaching and mechanical behaviour of concrete manufactured with recycled aggregates
The reuse of debris from building demolition is of increasing public interest because it decreases the volume of material to be disposed to landfill. A focus is on the evaluation of the possibility of reusing recycled aggregate from construction or demolition waste as a substitute for natural aggregate in concrete production. In most applications, cement based materials are used for building construction due to their cost effectiveness and performance; however their impact on the surrounding environment should be monitored. The interstitial pore fluid in contact with hydrated cementitious materials is characterized by persistent alkaline pH values buffered by the presence of hydrate calcium silicate, portlandite and alkaline ions. An experimental plan was carried out to investigate concrete structural properties in relation to alkali release in aqueous solution. Results indicate that the presence of recycled aggregate increases the leachability of unreactive ions Na, K, Cl, while for calcium the substitution resulted in a lower net leaching. In spite of the lower mechanical resistance, 40 % less, such a waste concrete may be suggested as more environmentally sustainable.
Leaching and mechanical behaviour of concrete manufactured with recycled aggregates
Auslaugen und mechanisches Verhalten von Beton, der mit zurückgewonnenen Zuschlagstoffen hergestellt ist
Sani, D. (author) / Moriconi, G. (author) / Fava, G. (author) / Corinaldesi, V. (author)
2005
6 Seiten, 17 Quellen
Conference paper
English
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