concrete (Limbachiya et al., 2007; Koulouris et al., 2004; Limbachiya et al., 2004) which revealed that recycled concrete can achieve equivalent engineering and durability performances. The traditional engineering characterisation regimes, for aggregates for concrete, can be enhanced through the application of chemical-mineralogical techniques primarily used on geological materials, establishing a multidisciplinary approach for an integrated quality control method. Chemical analysis of natural aggregates (fine and coarse), currently used in the production of concrete in the SE England, and coarse recycled aggregate produced from C&D waste have shown no substantial differences. Chemical results are in agreement with the mineralogical analysis that revealed, the exclusive presence of quartz in the coarse NA and the presence of feldspar and CaCO3 in the coarse RCA. These elements do not pose any threat to concrete engineering and durability performance. Chemical and mineralogical characterisation can be therefore used to establish the quality of the aggregate produced. On the other hand changes on the production method can be implemented based on these data and improve the efficiency of the production methods (crushing, sorting, screening, fines removal etc.). It is of great importance however, that C&D debris arrives at the production plant after appropriately sorted on-site (Poon et al., 2001; Poon, 1997). This study demonstrated that a multidisciplinary characterisation of natural and recycled aggregates for concrete is a suitable approach to complement the established engineering methodologies. On site quality control adopting chemical-mineralogical techniques will provide the necessary tool to establish the quality of recycled aggregates produced as well as assist in monitoring the efficiency of processing techniques.
Chemical mineralogical characterisation of recycled aggregates vs natural aggregates for concrete.
MARROCCHINO, Elena;
2008
Abstract
concrete (Limbachiya et al., 2007; Koulouris et al., 2004; Limbachiya et al., 2004) which revealed that recycled concrete can achieve equivalent engineering and durability performances. The traditional engineering characterisation regimes, for aggregates for concrete, can be enhanced through the application of chemical-mineralogical techniques primarily used on geological materials, establishing a multidisciplinary approach for an integrated quality control method. Chemical analysis of natural aggregates (fine and coarse), currently used in the production of concrete in the SE England, and coarse recycled aggregate produced from C&D waste have shown no substantial differences. Chemical results are in agreement with the mineralogical analysis that revealed, the exclusive presence of quartz in the coarse NA and the presence of feldspar and CaCO3 in the coarse RCA. These elements do not pose any threat to concrete engineering and durability performance. Chemical and mineralogical characterisation can be therefore used to establish the quality of the aggregate produced. On the other hand changes on the production method can be implemented based on these data and improve the efficiency of the production methods (crushing, sorting, screening, fines removal etc.). It is of great importance however, that C&D debris arrives at the production plant after appropriately sorted on-site (Poon et al., 2001; Poon, 1997). This study demonstrated that a multidisciplinary characterisation of natural and recycled aggregates for concrete is a suitable approach to complement the established engineering methodologies. On site quality control adopting chemical-mineralogical techniques will provide the necessary tool to establish the quality of recycled aggregates produced as well as assist in monitoring the efficiency of processing techniques.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
