Re-cycling of construction and demolition waste and steel slag: characterization of the durability

The main objective of the study was to evaluate the durability of a crushed concrete aggregate, processed from construction and demolition waste and an inert siderurgical aggregate for construction, processed from electric arc furnace steel slag, with a view to boosting their re-cycling, minimizing...

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Bibliographic Details
Published in:Journal of material cycles and waste management 2020-11, Vol.22 (6), p.1699-1711
Main Authors: Roque, António José, Rodrigues, Gonçalo Manuel, da Silva, Paula F.
Format: Article
Language:English
Subjects:
Aggregates
Basalt
Civil Engineering
Concrete aggregates
Concrete construction
Construction industry wastes
Construction materials
Cycles
Demolition
Durability
Electric arc furnaces
Engineering
Environmental Management
Landfills
Limestone
Natural resources
Nonrenewable resources
Performance evaluation
Renewable resources
Review
Slag
Waste disposal
Waste disposal sites
Waste Management/Waste Technology
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Summary:The main objective of the study was to evaluate the durability of a crushed concrete aggregate, processed from construction and demolition waste and an inert siderurgical aggregate for construction, processed from electric arc furnace steel slag, with a view to boosting their re-cycling, minimizing the consumption of non-renewable natural resources and preserving the capacity of landfills. Both recycled aggregates were selected based on their high availability worldwide and to be generally associated with suitable engineering properties. However, in many cases, their acceptance by the end-users continues to be very low. One reason for continuing this distrust is the lack of knowledge about the durability of both materials. In natural aggregates, durability has been considered as an important mechanical property in the evaluation of their performance, but it has not been studied in recycled aggregates; so, slake durability tests were carried out. Their durability was compared with the behaviour of two reference natural aggregates, a basalt and a limestone. To complement the durability results obtained, macropetrographic and micropetrographic examinations as well as physical characterizations were performed. The results of the tests showed that, under the test conditions adopted, both recycled aggregates present durability which foresees their use in civil engineering applications.
ISSN:1438-4957
1611-8227
DOI:10.1007/s10163-020-01061-y