Abstract
This paper reports on a case study conducted in a concrete block factory that uses the waste generated in the manufacturing process of these blocks as recycled aggregates to obtain new blocks, herein named concrete recycled blocks (CRB). The aim of this study was to evaluate the influence of the blocks recycled aggregates (BRAG) on the compression strength of the blocks. The blocks were designed to be used in the construction of social housing, seeking not only to comply with environmental regulations but also to meet sustainability requirements. The factory was set up on the construction site of a low-income housing project. The waste used derived exclusively from the residue of the concrete blocks, produced at different stages of the manufacturing process of the blocks. The BRAG were obtained through sieving. After its characterisation, the AGRB was included in the manufacturing process of new blocks. The same dosage criteria used for dry concrete with natural aggregates was applied in the concrete with recycled aggregates. The BRAG were used to replace the natural aggregates (powder-stone and / or natural sand). The block property evaluated was compressive strength. The best performance of he CRB was obtained with total replacement of stone powder and natural sand (CAGRB).
Keywords:
Block concrete; Recycled aggregate; Compressive strength
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