Abstract
The research presented in this article analysed the influence of incorporating precast concrete waste as an alternative to coarse aggregate in self-compacting concrete to generate new precast elements. The experimental study involved the characterization of recycled aggregate and the design of the mix of the new self-compacting concrete (SCC). The experimental study evaluates the physical processes that affect the durability of concrete with percentages of incorporation such as 20%, 50% and 100% of recycled aggregate. Two types of SCC were manufactured with minimum compressive strength of 30 MPa and 45 MPa. The properties analysed were density of hardened SCC, shrinkage cracking, freeze-thaw resistance, resistance to ageing by thermal shock and abrasion resistance. The results obtained were compared with those of the control concrete, observing great capacity of the SCC under physical aggressions that affect durability. The results of this research show that it is possible to use the recycled aggregate coming from precast pieces in order to the manufacture of self-compacting recycled concrete in the same precast industry. However, high loss of proprieties occurs for a 100% substitution, while for 20% and 50%, the variations with respect to control concrete are smaller. In addition, taking advantage of this waste to incorporate it back into the production chain contributes to more sustainable construction.
Highlights
Construction has existed since the origin of civilization (Greek and Roman temples serve as an example), construction with structural elements of precast concrete is more recent
The results show a decrease in the self-compacting concrete (SCC) density as the percentage of recycled aggregates (RA) in the mixture increases
RAs are adequate for the manufacture of a new concrete resulting in a good material with good of RAs are adequate for the manufacture of a new concrete resulting in a good material with strength, resistance, uniformity and little contamination
Summary
Construction has existed since the origin of civilization (Greek and Roman temples serve as an example), construction with structural elements of precast concrete is more recent. As has been shown in different studies, the use of superplasticizer additives can be an alternative to correct the workability and can be beneficial in terms of durability and mechanical resistance since it optimizes the w/c ratio [6]. In this regard, Sainz-Aja [10]. Demonstrated the viability of using recycled aggregate from out-of-service railway superstructure wastes for the manufacture of a more ecological SCC that fulfils the mechanical requirements of slab tracks Another property that is usually affected by the incorporation of RA is the durability of concrete. This can be considered innovative since, as mentioned above, the studies carried out to date have mainly study can be considered innovative since, as mentioned above, the studies carried out to date have focusedfocused on analysing the influence of these of RAs on the properties of concrete
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