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Recycled concrete fines as binders. An experimental approach.

Dermitzaki Roxani

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Summary

Waste concrete is the most predominant constituent material among construction and demolition waste. Recycling of this waste could minimize landfilled waste and mineral resources depletion. Current waste concrete recycling is limited to the use of recycled concrete aggregates as a road-base material or, in minor quantities, as aggregates in new concrete mixes. The production of recycled concrete aggregates results to the generation of high amount of fines consisting mainly of cement paste particles. The use of these fines in construction applications is limited. Moreover, the stockpiling and disposal of this fine airborne material poses severe environmental problems. This study aims to the production of cement mortars using recycled concrete fines activated through a thermal treatment method. The studied recycled concrete fines were collected from a construction and demolition waste plant located in Crete (Greece). Apart from the hydrated cement paste, fines also contain significant amounts of limestone dust. Fines were heated at temperatures of 600°C and 800°C and were used to replace 10, 20 and 30% by weight cement in control mixtures produced using Portland cement and quartz sand. Results showed that the usage of untreated fines is feasible for up to 10% by weight replacement of cement. For higher cement replacement percentage (20% wt. of cement), 600°C-treated fines appear to be a promising addition for the production of cement mortars.

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