Abstract
Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete. Fine (FRA) and coarse (CRA) recycled aggregates were used in different percentages as substitutes of natural sand and gravel, respectively. The results revealed that the use of RA in percentages of up to 50 wt.% is feasible. Additionally, RA were used to produce paving blocks in accordance with industrial requirements. Thus, values of water absorption lesser than 6.0% and tensile strength upper than 3.6 MPa were obtained, which are similar to those of a reference sample and within the limit values established by the regulations. These results were achieved by reducing the incorporation of cement, thereby saving production costs and minimizing environmental impact.
Highlights
The increase in population in emerging countries, together with the increase in residential development and the need for infrastructure improvements in developed countries, has meant that the construction sector has grown at a moderate rate in recent years and that the long-term outlook at the global level is positive
In light of the above, this aim of this paper is to develop a process that allows simultaneously maximising the incorporation of Recycled aggregates (RA) and reducing the cement requirement necessary for the manufacture of concrete paving blocks, complying with the established requirements
From the point of view of its resistance to fragmentation, the coarser particles are surrounded by parts that disaggregate when a force is applied to them, reducing the mechanical resistance
Summary
The increase in population in emerging countries, together with the increase in residential development and the need for infrastructure improvements in developed countries, has meant that the construction sector has grown at a moderate rate in recent years and that the long-term outlook at the global level is positive. In the decade, the construction sector is expected to grow above the growth of the world’s. The components of CDW are mostly non-hazardous They may contain harmful materials to both human health and the environment (U.S EPA 530-R-98-010 1998). In this regard, some studies highlight that certain CDW have significant amounts of leachable heavy metals, arsenic and lead (Tolaymat et al 2004).
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