What is it about?
Encapsulation of some fractions of the coarse RCA with a layer of cement paste could provide a simpler and cost effective solution. It has been successfully applied to lightweight concrete made with porous lightweight aggregates. This paper presents the results of an investigation on the cement treatment of the 4-8 mm fraction of the RCA, with the aim of impacting the physical and mechanical properties of structural concrete made entirely with recycled aggregates.
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Why is it important?
Aggregates represent around 80% of the weight of concrete, thus the production of concrete demands the availability of abundant sources for aggregates. Several quarries of aggregates are exhausted, and some countries have started to tax the use of virgin aggregates. Meanwhile Construction and Demolition Waste (C&D) availability is growing as the population in urban centers increases.
Perspectives
The encapsulation produces an improvement on the physical and mechanical properties and durability of the concrete. This enhancement is induced due to the improvement of the mechanical properties of the aggregates, and thus a denser and thinner ITZ is produced, which could consistently explain the improvement on strength and reduced absorption observed in concrete series in relation to concrete made with original recycled aggregates.
Dr Rubén Orozco-Morales
Universidad Central Marta Abreu de las Villas
Read the Original
This page is a summary of: Improving quality of coarse recycled aggregates through cement coating, Journal of Sustainable Cement-Based Materials, September 2016, Taylor & Francis,
DOI: 10.1080/21650373.2016.1234983.
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