Abstract
abstract: Concern with the maintenance of natural resources has increased research about recycled aggregates for concrete production. However, the heterogeneity of recycled aggregates is one of the main constraints for their use in practice, because it can generate variability in concrete properties, hence reducing their final quality. Then, the jigging has been seen as a promising way of improving recycled aggregate quality. This paper aimed to evaluate its use for better application in concrete. A modified jig was used to sort recycled coarse aggregates. Concrete were produced with water/cement ratio from 0.5 and 100% of recycled coarse aggregate. The recycled aggregate properties upgrade were achieved and the results of compressive strength and modulus of elasticity of recycled concrete made with aggregate which were submitted to jigging were increased, indicating a potential application in wide scale.
Highlights
In recent decades, the recycling of construction and demolition waste (CDW) has been studied as a sustainable alternative for the minimization of consumption and exploitation of natural resources and the waste generation in construction sector
Recycled aggregates properties Construction and demolition waste is residue generated from refurbishment, excavation or demolition and usually includes inert materials with lower amounts of other components such as wood, glass, gypsum, bituminous mixtures, among others [39]
It is noted that CDW aggregate components separation took place when were subjected to the jigging process, with a greater fraction of higher density aggregates present in the lower layer and the less density aggregates disposed in the upper layer, following a trend line of the results and proving the jigging efficiency, in accordance with described by Sampaio and Tavares [13]
Summary
The recycling of construction and demolition waste (CDW) has been studied as a sustainable alternative for the minimization of consumption and exploitation of natural resources and the waste generation in construction sector. The construction industry is considered the world’s largest solid waste generator with an estimated amount of more than 10 billion tons and a growth perspective to coming years [1]–[3] For the Brazilian scenario, it is. Masuero estimated that the production of these residues variable and correlated with the Human Development Index (HDI) is higher than 70 million tons per year (about 500 kg/inhabitants/year), configuring more than 50% of all urban solid waste in the country [4]
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