Analysis of the feasibility of manufacturing concrete paving blocks with recycled aggregates from construction and demolition waste
DOI:
https://doi.org/10.58922/transportes.v31i1.2860Keywords:
Interlocking concrete blocks, Recycled aggregates, Construction and demolition waste, Design methodsAbstract
This paper aims to analyze the feasibility of using interlocking concrete blocks with recycled aggregates from construction and demolition waste for paving. First, dry concrete was produced, known to have zero slump, requiring a vibro-press machine for compaction and immediate stripping. Then, four dry concrete mixtures, CDW-0.63, REF-0.73, 50CDW-0.63, and 50CDW-0.73 (the first two and the last two without and with recycled aggregates, respectively), were applied with two water/cement ratios (0.63 and 0.73). In the next step, empirical and mechanistic-empirical design methods were used for interlocking block pavement, simulating the construction of this structure with cost evaluation. The results showed that the reference mixture REF-0.73, with more water, presented the highest characteristic compressive strength at 28 days (25.34 MPa). Furthermore, the interlocking pavement simulation from the mechanistic-empirical design, with recycled aggregates in the blocks (mixture 50CDW-0.63), generated savings of around US$76,000.00 compared to the pavement of reference blocks (mixture REF-0.73). Finally, dry concrete can present better mechanical behavior with the addition of water, and the interlocking pavement technology is more financially attractive applying the mechanistic-empirical design method.
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