Influence of heterogeneity, typology, and contaminants of recycled aggregates on the properties of concrete
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Resumo
Background:
The depletion of raw material resources, the preservation of the environment, and the need to compensate economic imbalances drive research
efforts regarding the application of Construction and Demolition Waste (CDW) in concretes.
Objective:
This paper aimed to assess the influence of the heterogeneity, typology, and presence of contaminants of CDW (collected in different seasons and
locations) on the mechanical properties and durability of concretes.
Methods:
Characterization procedures were performed for the aggregates (visual quantification and physical properties of the constituents), and for the
concretes (compressive strength, splitting tensile strength test, modulus of elasticity, water absorption, porosity, electrical resistivity, carbonation
depth, and digital microscopy). The replacement rate of natural aggregate for CDWA was of 20% in three different particle sizes: sand, gravel 0,
and gravel 1.
Results:
The characteristics of the samples of CDW were very variable, influenced by the season and location of collection. The presence of materials with
elevated porosity (ceramics, mortars) was observed in some samples and required increases in mixing water volume to keep the concretes’
consistency. A wide variation in mechanical properties caused by the CDWA constituents was also observed. Regarding the durability of the
concretes, it was proven the greatest sensibility of this property to contaminants, thus requiring the removal of deleterious materials to using
CDWA in structural concretes in order to avoid the formation of vesicles and guaranteeing their life span.
Conclusion:
The heterogeneity, typology and contaminant content significantly influence the analyzed properties. Besides, the segregation of waste at source
makes the use of CDWA feasible in concretes.
Abstract
Assunto
Propriedades mecânicas, Durabilidade
Palavras-chave
Construction and demolition waste, Recycled aggregates, Structural concrete, Mechanical properties, Durability, Waste variability
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Endereço externo
https://openconstructionbuildingtechnologyjournal.com/VOLUME/14/PAGE/382/#aff1