Compressive strength of reduced concrete specimens considering dimensional distortion of coarse aggregates

Azevedo, Carlos Felipe de; Carvalho, José Maria Franco de; Mendes, Júlia Castro; Castro, Arthur Silva Santana; Barreto, Rodrigo Rony; Peixoto, Ricardo André Fiorotti

doi:10.1016/j.conbuildmat.2020.119448

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…Table 3 presents the tests performed in the hardened concrete and the respective adopted standards. Additionally, a method, based on Solak et al [56], Abril et al [57] and de Azevedo et al [58], was proposed to evaluate the possible occurrence of coarse aggregate segregation in the concretes. Each specimen was sectioned longitudinally using a diamond saw in a wet section.…”

Section: Lightweight Concretesmentioning

confidence: 99%

Sustainable Structural Lightweight Concrete with Recycled Polyethylene Terephthalate Waste Aggregate

Resende,

de Carvalho,

Paiva

et al. 2024

Buildings

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Plastic is a widely consumed material with a high decomposition time, occupying significant space in landfills and dumps. Thus, strategies to reuse plastic waste are imperative for environmental benefit. Plastic waste is a promising eco-friendly building material for cement-based composites due to its reduced specific gravity and thermal conductivity. However, this waste reduces the composites’ mechanical strength. This work aims to produce and evaluate lightweight concretes made with only lightweight aggregates and mostly recycled plastic aggregates. Initially, an optimized dosage approach for lightweight concrete is presented. The mixture proportion of the lightweight concrete was based on the performance of mortars with the complete replacement of natural aggregate by recycled polyethylene terephthalate (PET) aggregates. The PET aggregates showed irregular shapes, impairing workability and providing lightweight concretes with around 18% water absorption and 21% void index. However, the concretes presented significantly low-unit weight, approximately 1200 kg/m3. This work presented a structural lightweight concrete (ACI 213-R) using only lightweight aggregates and mostly plastic waste aggregate, with a compressive strength of up to 17.6 MPa, a unit weight of 1282 kg/m3, and an efficiency factor of 12.3 MPa·cm3/g. The study shows that with an optimum dosage, reusing plastic waste in concrete is a viable alternative contributing to environmental sustainability.

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Section: Lightweight Concretesmentioning

confidence: 99%