Mortars with recycled aggregate of construction and demolition waste: Mechanical properties and carbon uptake

Borges, Pietra Moraes; Schiavon, Jéssica Zamboni; Silva, Sérgio Roberto da; Rigo, Eduardo; Neves, Alex; Possan, Edna; Andrade, Jairo José de Oliveira

doi:10.1016/j.conbuildmat.2023.131600

Cited by 7 publications

(1 citation statement)

References 30 publications

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“…On the other hand, a rapid population growth has influenced the increase in construction activities, thus generating more CDW, i.e., waste made up of sand, gravel, concrete, mortar, bricks, and glass, among others (Wong et al, 2018;Vieira et al, 2020). Recent studies have repurposed CDW as recycled aggregates to produce concrete and mortar, demonstrating its technical and environmental feasibility Borges et al, 2023). Da pointed out that the use of CDW as a recycled aggregate, in conjunction with fly ash (FA) and hydrated lime (HL), has a synergistic effect that could enhance the mechanical properties and durability of concrete.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Use of Recycled Brick Powder as a Partial Replacement for Portland Cement in Concrete

Aquino Rocha,

Morales Ruiz,

Toledo Filho

2024

Ing. Inv.

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Portland cement is one of the most used construction materials. However, its production represents between 5 and 7% of the total CO2 emissions. On the other hand, during construction and demolition activities, different wastes are produced, including recycled brick powder (RBP), whose potential as a supplementary cementitious material (SCM) has been demonstrated in the literature. This research aims to evaluate RBP as a partial replacement for Portland cement in concrete. 5 to 10% of Portland cement was replaced with RBP in two strength designs (20 and 25 MPa) in order to propose concretes that meet the requirements for use in construction. Tests involving slump, compressive strength, tensile strength by diametrical compression, absorption, density, and void content were performed. The results show that a 5% RBP replacement does not affect workability in concrete mixes, as it maintains their mechanical resistance and slightly improves their physical properties. On the other hand, 10% RBP replacements adversely affect workability and reduce tensile strength. These results are attributed to pozzolanic activity and the physical effect caused by RBP, whose performance may be improved by reducing RBP particles and increasing their specific surface area (SSA). Using RBP as a replacement for Portland cement to produce concrete is a viable alternative with a sustainable approach.

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Section: Introductionmentioning

confidence: 99%