Aggregates are the end product of the recycling process of CDW. They are sold as construction material to be used, depending on the particle size (grain size obtained), for drainage, capping, for subbase layers on pavements, etc.
The recycled aggregate has a Quality assurance and CE marking of recycled aggregates, issued by the Spanish Standards and Certification Association, AENOR, which guarantees the high performance of the resulting and marketed material.
Uses of recycled concrete:
Most of crushed concrete aggregate is sold for use in bases and subbases untreated or treated with cement or bituminous binders, and to a lesser extent, as surface layers of pavements.
Bases and subbases: Is the most common application of crushed concrete in roads as it can absorb large volumes and generally provides the same level of quality as that demanded of natural aggregates for this use, with minimum concrete content and maximum impurities.
Sub-bases and bases treated with cement or bituminous binders:The treatment of recycled concrete with cement or bituminous binders increases the strength of the material, reducing the susceptibility to ice, permeability and potential leaching.
Superficial layers of pavements: This application generally requires higher quality aggregates than the previous ones, so its use is slightly more restrictive.
BUILDINGS AND PUBLIC WORKS:
The main applications are coarse aggregates for concrete and fine aggregates for use in mortars and cements.
Aggregate for concrete: Coarse aggregates can be used for recycled concrete and reinforced concrete, maintaining the dosage criteria of conventional concretes. The specifications for recycled coarse aggregates must comply with a number of requirements for the manufacture of new concrete (as set by RILEM TC 121 DRG, 1994), in terms of minimum dry density, maximum absorption or maximum metal content.
Fine aggregates for use in mortars:Is another possible use, considering that fine aggregates from crushed concrete contain certain amounts of calcium hydroxide, which mixed with water and pozzolanic materials confer it hydraulic properties that produce high compressive strength products.
Cements made with fine aggregates: Use fine aggregates smaller than 5mm, which mixed with other materials, result in high-strength cement, provide volume stability and are frost resistant in a similar way to cements made from natural fine aggregates, although these types of cements are not manufactured in Spain.
MATERIALS THAT CAN NOT BE RECYCLED
The material which is rejected in both treatment processes of the plant is construction and demolition waste that is not suitable for use in the recovery process due to its composition. It is transferred to the controlled landfill, authorized for this type of waste.
Waste such as glass, iron, wood, cardboard or plastic that has been recovered during the treatment process, is delivered to specialized managers for its proper disposal.
Salmedina Treatment of Inert Waste is a company that provides treatment and management of construction and demolition waste. It is located in the district of Villa de Vallecas, in the municipality of Madrid.
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