Concrete containing recycled aggregates: Estimated lifetime using chloride migration test

Júnior, Nilson S. Amorim; Silva, Guilherme A.O.; Dias, Cléber Marcos Ribeiro; Ribeiro, Daniel Véras

doi:10.1016/j.conbuildmat.2019.06.136

Cited by 47 publications

(22 citation statements)

References 34 publications

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“…Portland clinker with civil construction waste: influence of pellet geometry on the formation of crystalline phases 209 material removal unit using airflow, and the material is then poured into a primary hopper (AMORIM JÚNIOR et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Civil construction waste (CCW), which represents about 56% of urban solid waste (ASSOCIAÇÃO…, 2020), offers many opportunities for reuse. Several studies have reported positive results indicating the technical feasibility of using construction waste in various ways, mainly to replace natural aggregates (GUO et al, 2018;BUI;SATOMI;TAKAHASHI, 2018;AMORIM JÚNIOR et al, 2019;BOGAS;CARRIÇO;PEREIRA, 2019) and as a complementary cementitious material CHOI, 2012;ASENSIO et al, 2016;LETELIER et al, 2017;CANTERO et al, 2019) in concretes and mortars. These wastes have been tested in the manufacture of cement, replacing part of the conventional raw materials (limestone and clay) of Portland clinker (GALBENIS;TSIMAS, 2006;PUERTAS et al, 2008;SCHOON et al, 2015;TAE;KIM, 2018) or be used as an addition, replacing part of the clinker in the final cement composition (AY; ÜNAL, 2000; SHAH; BISHNOI, 2015; RUIZ-SÁNCHEZ; SÁNCHEZ-POLO; ROZALEN, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Portland clinker with civil construction waste: influence of pellet geometry on the formation of crystalline phases

2020

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Efforts to reduce greenhouse gas emissions in the context of sustainable development have intensified, with the development of research aimed at the production of new materials and binders for construction. This article analyzes the influence of pellet geometry in the production of clinkers, with the incorporation of construction waste (CCW). Procedures adapted from the method proposed by Brazilian Portland Cement Association were adopted in studies of laboratory clinkers, in an attempt to simulate the stages of the industrial process. Pellets were prepared with the same formulation, however, with four different geometries: spherical, with diameters of 1 cm, 2 cm and 3 cm, with manual molding, and semi-spherical, with a diameter of 2 cm, using molds of PLA (polylactic acid) printed on a 3D printer to facilitate the molding of the clinkers in a standardized way. Clinkers were characterized mineralogically by x-ray diffraction (XRD) and the Rietveld method was used to quantify the phases. Variations in the quantities of the alite and belite phases were observed depending on the geometry of the pellets, although the same calcination conditions were used. This is probably due to the variation in the surface area (exposure area) and the gradients of the cooling rate.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Portland clinker with civil construction waste: influence of pellet geometry on the formation of crystalline phases

2020

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“…This has not yet been widely applied. For example, in Brazil, only, approximately 20% of CCW is reused [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, using recycled aggregates becomes more attractive in cases where high mechanical resistance and low water absorption are not required. In addition, studies have shown that this type of aggregate obtained from CCW does not result in good durability when exposed to aggressive media [3,10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Additives, Cement Type, and Foam Amount on the Properties of Foamed Concrete Developed with Civil Construction Waste

et al. 2019

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The main objective of this study was to evaluate the use of additives in producing foamed concrete blocks, which were made by totally replacing natural sand with civil construction waste (CCW). The concrete blocks were developed in accordance with an experimental design that used the complete factorial statistical method, for which three factors with different levels were considered: cement type (CP-V, CP II-Z, and CP II-F); use of additive (without additive, plasticizer, air entrainment, and superplasticizer) and foam amount (5.7%, 7.7%, and 9.5% of the total mass). The influence of each factor and the interactions between them were assessed on the following response variables: compressive strength, dry and saturated density, air voids, water absorption, and thermal conductivity. The results show that all factors had a significant influence on the variable response. For example, the use of the superplasticizer additive resulted in higher compressive strength, lower density, lower air void, and lower thermal conductivity. Finally, the use of additives had little influence on the response variables in relation to the other factors.

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Principles of Tailor-Made Recycled Aggregate Concrete

Makul

2021

Structural Integrity

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Concrete containing recycled aggregates: Estimated lifetime using chloride migration test

Cited by 47 publications

References 34 publications

Portland clinker with civil construction waste: influence of pellet geometry on the formation of crystalline phases

Portland clinker with civil construction waste: influence of pellet geometry on the formation of crystalline phases

Effect of Additives, Cement Type, and Foam Amount on the Properties of Foamed Concrete Developed with Civil Construction Waste

Principles of Tailor-Made Recycled Aggregate Concrete

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