The role of powder content of the recycled aggregates of CDW in the behaviour of rendering mortars

Ferreira, Ruan L.S.; Anjos, Marcos Alyssandro Soares dos; Nóbrega, A. K. C.; Pereira, Jéssyca Emanuella Saraiva; Ledesma, Enrique

doi:10.1016/j.conbuildmat.2019.03.058

Cited by 50 publications

(35 citation statements)

References 60 publications

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“…The water/cement ratio was determined after the aggregates were dried, and was based on the amount of required water to achieve a proper workability to the mortar. Taking into account that renders require good plasticity for application over a vertical substrate and proper spread, the water/cement ratio obtained in this paper follows a similar trend to previous research [5,27,53].…”

Section: Methodssupporting

confidence: 86%

“…From the studies of Neno et al [15], the incorporation of RCA slightly increased the capillary coefficient of the modified mortar, but the change was not considered significant. However, in other works, the incorporation of MRA had a significant negative influence on water absorption of the mortars [5,27,30].…”

Section: Literature Reviewmentioning

confidence: 75%

“…Concerning the compressive strength of the modified mortars, contrasting results were obtained. In most of the studies, an increasing content of recycled aggregates results in a decrease of the mechanical strength of the mortar [5,[27][28][29][30][31]. This could be explained by the fact that the compressive behaviour of the composite is highly related to the aggregate's mechanical strength rather than to the cement matrix's bond in the interfacial transition zone [32].…”

Section: Literature Reviewmentioning

confidence: 99%

“…In general, the use of recycled aggregates as aggregate in mortars decreases the modulus of elasticity [2,19,27,28]. This can be related to the amount of old mortar adhered to the recycled aggregates particles, which could lead to a greater deformability of the mortar [33,34].…”

Section: Literature Reviewmentioning

confidence: 99%

“…Only a small amount of research has evaluated the incorporation of MRA in rendering mortars. Ferreira et al [27] analysed the role of powder content of the MRA in coating mortars produced with cement and limestone with a volumetric ratio of 1:1:6. Poon and Kou [28] also studied the use of MRA in cementitious rendering mortars.…”

Section: Introductionmentioning

confidence: 99%

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Concrete-Based and Mixed Waste Aggregates in Rendering Mortars

et al. 2020

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This paper presents a study of incorporation of two types of construction and demolition waste (CDW) in rendering mortars, as aggregates at 0%, 20%, 50% and 100% (by volume). Recycled concrete aggregate (RCA) and mixed recycled aggregate (MRA) were used. The former is mainly composed of cementitious waste and the latter consists of a mixture of non-segregated wastes. The performance of the cement mortars with recycled aggregates was evaluated through an extensive experimental programme. The analysis comprised workability, mechanical strength, water absorption, shrinkage, open porosity and the evaluation of durability by permeability to water under pressure after an artificial accelerated ageing test. The results are considered positive, although as the incorporation of recycled aggregates (both MRA and RCA) increased the mechanical strength, the modulus of elasticity and bulk density decreased, which leads to the production of lighter mortars that are less susceptible to cracking. The modified mortar with 20% of MRA presented the best performance, in terms of mechanical behaviour.

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Section: Methodssupporting

confidence: 86%

Section: Literature Reviewmentioning

confidence: 75%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Concrete-Based and Mixed Waste Aggregates in Rendering Mortars

et al. 2020

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Incorporating coarse and fine recycled aggregates into concrete mixes: mechanical characterization and environmental impact

Younes,

Elbeltagi,

Diab

et al. 2023

J Mater Cycles Waste Manag

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Concrete waste (CW) recycling stands as a promising strategy to promote sustainable construction practices. This research aims to assess the feasibility of using recycled concrete aggregates (RCA) as a surrogate for natural aggregates (NA) in concrete applications and reduce the environmental impact associated with the depletion of natural resources and landfill space. To achieve these objectives, CW was segregated from debris mixes of construction and demolition waste (CDW), collected, crushed, and graded to generate RCA. Thirty-two concrete samples were prepared and categorized into four distinct groups with 0% (reference), 50%, 75%, and 100% substitution levels for both coarse RCA (CRCA) and fine RCA (FRCA), all utilized simultaneously. Concurrently, the environmental impacts of producing 1 m3 of concrete were evaluated using a life cycle assessment (LCA) approach, (cradle-to-gate) covering three phases, the raw material supply (A1), transportation (A2) and concrete production (A3). At the 50% replacement level, the mechanical properties of recycled aggregate concrete (RAC) demonstrated a 20.0% increase in splitting tensile strength, accompanied by marginal decrease in workability (15.0%) and compressive strength (6.0%). In addition, at that percentage, the average environmental effects were reduced by 31.3%, with specific reductions of 34.7% for A1, 40.3% for A2, and no change in A3.

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