Modelo De Estimação Da Produção De Agregados Reciclados À Partir Da Britagem Dos Resíduos Da Construção Civil

Milani, Ana Paula da Silva; Pupin, Nayara Severo

doi:10.24857/rgsa.v16n3-006

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…Segundo Pupim (2022) numa pesquisa aplicada aos agentes envolvidos -construtores/empreiteiros -em Campo Grande trouxe resultado surpreendente, evidenciando que a maioria dos possíveis stakeholders não sabiam da existência de usinas de reciclagem que produzem o agregado reciclado. Os impedimentos identificados para utilização do RCC reciclado são devido às informações insuficientes sobre disponibilidade e previsibilidade de produção; incerteza da qualidade e eficácia dos produtos para projetos de construção.…”

Section: Introductionunclassified

Qualidade do agregado reciclado misto de usinas recicladoras de RCC de Campo Grande – MS

Freitas,

Mendes,

Almeida

et al. 2023

Viii Encontro Nacional De Aproveitamento De Resíduos Na Construção

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Apesar da implantação dos planos gestores em Campo Grande-MS, a reciclagem de resíduos da construção civil (RCC) tem encontrado obstáculos, sendo relevante a garantia da qualidade do agregado reciclado misto (ARM) para os stakeholders da logística reversa do setor. Assim, estudou-se a variabilidade das características físicas dos ARM de classe A produzidos pelas recicladoras da cidade por meio de coleta periódica de amostras de lotes de ARM em duas empresas. Foram aplicados ensaios de caraterização física e verificado o alcance dos requisitos normativos para uso do ARM em compósitos cimentícios e/ou pavimentação. Análise estatística mostrou significativa variabilidade das características entre os lotes, no entanto a britagem está adequada para atendimento dos limites de absorção de água, teor de finos e de friáveis, índice de forma, e distribuição granulométrica nas faixas de agregados graúdos e miúdos. Somente o parâmetro “materiais indesejáveis’ se mostrou o gargalo do processo de reciclagem das recicladoras.

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Section: Introductionunclassified

Qualidade do agregado reciclado misto de usinas recicladoras de RCC de Campo Grande – MS

Freitas,

Mendes,

Almeida

et al. 2023

Viii Encontro Nacional De Aproveitamento De Resíduos Na Construção

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Reverse Logistics In Footwear Production - In The Stage After Returned From Consumer

Schreiber¹,

Sander²,

Vier³

2023

RGSA

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Purpose: Analyze the possibility of carrying out reverse logistics in the footwear production chain, with a specific focus on the post-consumer return stage. Theoretical background: In order to build the theoretical lens to interpret the empirical data, the authors reviewed the scientific literature that deals with waste from the footwear manufacturing process, as well as reverse logistics in the Brazilian footwear industry. Method/design/approach: A single case study strategy was chosen, in one of the largest shoe manufacturers in Brazil, a qualitative approach, data collection through semi-structured interviews with managers of the investigated organization, directly linked to processes related to the reverse logistics of the product, in addition to a documentary survey, based on internal industry records and non-participant systematic observation. Results and conclusion: The research results showed that the reverse logistics of footwear, in the post-consumer stage, would be feasible to be implemented, but with high initial investment and maintenance costs, which could not be supported by the industry. Research implications: As managerial contributions, the set of empirical evidence that points to the technical viability of reverse logistics in the analyzed sector stands out, which can induce more academic research and thus benefit society. Originality/value: This is a study that is still little explored in the scientific literature.

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Sustainable Concrete Produced with Petroleum Catalyst waste and Polyethylene Glycol as a Self-Healing Agent

Da Costa,

Guedes,

Ribeiro

et al. 2023

RGSA

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Purpose: To evaluate the production of concrete from the partial replacement of Portland cement with petroleum catalyst residue (RC), generated in large quantities by the petrochemical industries, and the addition of polyethylene glycol 400 (PEG 400), with an emphasis on investigating its mechanical properties and durability, considering the technological, scientific and environmental aspects. Theoretical framework: Oil catalyst waste is generated in significant quantities and is classified as non-inert due to its metal ion content, so there is a need to investigate new disposal methods. The use of RC as partial substitute for Portland cement, with the addition of PEG 400 (self-curing agent), was investigated for the production of non-conventional concrete. The waste has pozzolanic activity, enabling improvements in mechanical properties when added to the cement matrix. PEG 400 has properties that can make concrete more effective in terms of water absorption, hydration heat and workability. The search for sustainability leads to research into new construction materials in order to preserve natural resources and reduce environmental impact. The concrete developed can be lower cost and more durable, without any loss of structural strength. Method/design/approach: The use of RC was investigated with partial substitutions of 2%, 5%, 10% and 20% in relation to the total mass of Portland cement for the manufacture of concrete and the addition of polyethylene glycol (PEG 400) as a self-curing agent. The void ratio, water absorption by capillarity and immersion, specific masses and pozzolanicity index of the waste were investigated. Mechanical and morphological characterization tests were also carried out on the concretes developed. Results and conclution: The compressive strength of concrete produced with 2% RC in relation to the total mass of cement and 1.5% PEG 400 increased by 18.3% compared to conventional concrete. An increase in the amount of residue caused a reduction in concrete strength. The sample with 1.5% PEG 400 obtained better workability in the fresh state, which may be due to the polymer acting as a self-healing agent. The images obtained by scanning electron microscopy showed that the samples containing 2% added RC had lower porosity. The study showed that the waste can be used satisfactorily in civil construction and the implementation of this new process can reduce global warming and the scarcity of mineral resources, taking sustainability into account. Research implications: This work contributes to a sustainable circular economy with a new process for using petroleum catalyst waste, with pozzolanic characteristics, in cementitious materials. Originality/value: The results will be promising for the use of petroleum catalyst waste and polyethylene glycol in the production of environmentally sustainable concrete.

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Modelo De Estimação Da Produção De Agregados Reciclados À Partir Da Britagem Dos Resíduos Da Construção Civil

Cited by 5 publications

References 10 publications

Qualidade do agregado reciclado misto de usinas recicladoras de RCC de Campo Grande – MS

Qualidade do agregado reciclado misto de usinas recicladoras de RCC de Campo Grande – MS

Reverse Logistics In Footwear Production - In The Stage After Returned From Consumer

Sustainable Concrete Produced with Petroleum Catalyst waste and Polyethylene Glycol as a Self-Healing Agent

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