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ENVIRONMENTAL ASPECTS OF DISMANTLING OF OLD BUILDINGS DURING THE RECONSTRUCTION IN MOSCOW
Abstract
Dismantling of dilapidated buildings in a huge modern megapolis like Moscow is one of the highest priorities and topical issues of our time. At current levels of renovation in the city a huge amount of build wastes is generated every year. A large part of wastes is reinforcement concrete and concrete waste. Recycling of these materials is a significant environmental aspect. Unsuitable concrete and prefabricated concrete elements are disposed of in landfills and thereby pollute the environment. At present millions of cubic meters of concrete and reinforced concrete wastes have been generated on Moscow landfills. The amount of generated wastes is increasing exponentially. Landfilling of concrete waste leeds to a loss of significant amount of expensive materials ? concrete fillers, cement and steel reinforcement. In that regard, the issue of using substandard concrete elements, large-sized rubbles of demolished buildings and structures is paid a lot of attention. This fact predetermines the necessity of the effective use of wastes in new construction, which requires the development of new methods and techniques for the use of crushed concrete in cement and concrete compositions. Nowadays centralized recycling of crushed concrete by crushing for concrete aggregate production with required fractions is effectively applied in Moscow waste disposal sites. During such recycling of concrete and reinforced concrete waste with the recovery of steel reinforcement a significant amount of concrete fine fractions is generated. Crushing undersize of concrete waste may exhibit secondary astringency, caused by presence of hydrated compounds and incompletely reacted particles of cement. The research has been conducted in order to improve the activity of recycled concrete fines combined with superplasticizer by dry milling in vibration mill. Activated recycled concrete fines has been milled to a specific surface area about 450 m2/kg. The obtained material was used as filler in a composite binder, which combined with crushed concrete aggregates of fraction 5-10 mm was used for self-compacting concrete mixtures.
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References15
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