Leaching performance of concrete eco-blocks: Towards zero-waste in precast concrete plants.

This work presents a case study of waste incorporation, where precast concrete block rejects were reincorporated into the production of new recycled concrete blocks which stands for a technically and environmentally viable alternative to natural aggregates. This study therefore evaluated the technical feasibility, first, and the leaching performance, after, of recycled vibro-compacted dry mixed concrete blocks using different percentages of substitution of recycled aggregates (RA) coming from precast concrete block rejects in order to identify those that presented a better technical performance. According to the results, concrete blocks with a 20% of RA incorporation presented an optimum physic-mechanical behaviour.

Recommendations for the management of construction and demolition waste in treatment plants.

The construction and demolition waste is one of the heaviest and most voluminous waste streams generated in the European Union. It comprises approximately one third of the waste generated. Recycling this stream waste will provide ecological and sustainable benefits.

Promotion of circular economy: steelwork dusts as secondary raw material in conventional mortars.

Among the actions proposed by the European Union for the implementation of Circular Economy is the use of waste as a secondary raw material (SRM). During the fusion of the scrap, a steel dust is generated, named electric arc furnace dust (EAFD). The EAFD is composed mainly of potentially leachable heavy metals and is classified as a "hazardous" waste.

Long-term leaching and mechanical behaviour at recycled aggregate with different gypsum contents.

Construction and demolition recycling is regarded as an essential subject in the EU, as the target established by its policies to 2020 ratio is far from being achieved. The use of materials recycled from such waste has been widely deemed a contribution to the sustainability of the construction sector. Gypsum is one the limiting components of recycled aggregates used as a base layer in road construction.

Upscaling the pollutant emission from mixed recycled aggregates under compaction for civil applications.

In general terms, plant managers of sites producing construction wastes assess materials according to concise, legally recommended leaching tests that do not consider the compaction stage of the materials when they are applied on-site. Thus, the tests do not account for the real on-site physical conditions of the recycled aggregates used in civil works (e.g.

Feasibility of Using Unbound Mixed Recycled Aggregates from CDW over Expansive Clay Subgrade in Unpaved Rural Roads.

Social awareness aims to increase practical skills, such as sustainable development, which seeks to increase the use of different types of waste in construction activities. Although insufficient attention is sometimes given to these actions, it is essential to spread information regarding new studies in the field of waste recycling, which encourages and promotes waste use. Reusing and recycling construction waste in the creation of buildings and infrastructure are fundamental strategies to achieving sustainability in the construction and engineering sectors.

Correlation analysis between sulphate content and leaching of sulphates in recycled aggregates from construction and demolition wastes.

In some recycled aggregates applications, such as component of new concrete or roads, the total content of soluble sulphates should be measured and controlled. Restrictions are usually motivated by the resistance or stability of the new structure, and in most cases, structural concerns can be remedied by the use of techniques such as sulphur-resistant cements. However, environmental risk assessment from recycling and reuse construction products is often forgotten.