Abstract
This paper presents a physical characterization for the recycling into new concretes of three comminuted concretes: C16/20 (“ordinary concrete”), C50/60 (“high strength concrete”), and C70/85 (“very high strength concrete”). The top size of the crushed concretes was 19.1 mm and the size range was 4.75 to 19.1 mm. The characterization was carried out with coarse aggregate liberation, to be prepared and concentrated in a gravity concentration process. The density distribution of the coarse aggregate, cement paste, and sand was carried out in different size ranges (4.75/19.1 mm; 4.75/8.0 mm; 8.0/12.5 mm; and 12.5/19.1 mm) for the three concretes studied. The form factor of the samples, as well as the porosity determination of particles in different density ranges, are presented. The obtained results indicate that the coarse aggregate liberation was more intensive for the low resistance concrete (C16/20), but a reasonable coarse aggregate recovery is possible for all concretes.
Highlights
Huge amounts of construction and demolition waste (CDW) are produced all over the world each year
The results indicate the technical feasibility of the use of this type of recycling for the production of permeable concrete, with properties accepted by the market, such as permeability coefficient and total void ratio
This can be explained by the coarse aggregate liberation from cement paste during comminution
Summary
Huge amounts of construction and demolition waste (CDW) are produced all over the world each year. All the statistics point towards the huge generation of CDW, with increasing illegal dumping [3]. CDW represents in Europe today about 30% of all solid wastes generated on the continent [4]. There are thousands of CDW preparation plants all over the world [5,6,7,8]. These plants usually crush CDW, remove the finest particles and separate light materials (like plastics, papers, wood, etc.) and metal parts (ferrous and non-ferrous). The residual material is known as Inert CDW and basically contains bricks, tiles, gypsum, concrete, mortar, and coarse aggregate [9,10]
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