Overview of the Mechanical Properties of Concrete Incorporating Waste From the Concrete Industry as Aggregate
Streszczenie
Millions of tons of construction and demolitions wastes (CDW) are generated annually
by the concrete industry, and these wastes most times end up in landfills where they
contaminate the environment. As the global demand for concrete increases with a
consequential increase in the consumptions of its components, the use of alternative
materials as components in concrete will create a pathway to meet the future demand for
concrete. One of the sustainable way forward is replacing the most voluminous
component of concrete (i.e. aggregates) with CDW. However, in order to use CDW as
aggregate, it needs to undergo processing which turns it into recycled aggregate.
Mechanical properties of concrete are greatly affected by the components in concrete,
and the replacement of natural aggregates with processed CDW is expected to alter the
resulting properties of concrete. Though there are several contradicting conclusions in
the literature which might be as a result of different sources and properties of CDW (i.e.
recycled aggregate) used. This overview showed that processed CDW can be used
successfully as aggregate in concrete to achieve similar/higher strength compared to
those made with natural aggregate. But the proper treatment of the recycled aggregate
and/or additions such as incorporation of supplementary cementitious materials have to
be made. Also, the use of alternate binders such as alkali-activated materials with
recycled aggregate can be used to achieve enhanced mechanical properties. In
conclusion, the use of these wastes as aggregates in concrete will help to prevent more
exploitation of natural deposits of aggregates alongside with reducing the overall cost of
the concrete.
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