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      Production of components with plaster residue and sodium citrate: physical, mechanical, rheological analysis Translated title: Produção de componentes com resíduo de gesso e citrato de sódio: análise física, mecânica, reológica

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          Abstract

          Abstract The construction industry, a major influencer in Brazil’s economic and social development, is responsible for a large consumption of raw materials and waste production. In particular, plaster presents significant growth, especially in the Northeast, due to the region of Araripe, great producer of this construction material. Considering the serious problems caused by the incorrect disposal of plaster in nature, there is the challenge of its recycling process. This research aimed to analyze several percentages of plaster residues to be added to the plaster paste, with and without retarder additive (sodium citrate), in terms of physical, mechanical, and rheological properties, focusing at the production of components. For that, the residue underwent physic-chemical recycling process to be replaced by plaster or by mass, in the percentages of 25%, 50%, 75% and 100%. The study of the performance of the material was done through the tests of granulometry, unit mass, mini-slump method, calorimetry, squeeze-flow method, compressive strength, and surface hardness. The results showed that the recycled plaster (RP) did not excessively damage the studied properties, and it was permissible to substitute up to 50% of RP in the production of the paste for components, following the recommendations of the recycling process and water/plaster ratio.

          Translated abstract

          Resumo A indústria da construção civil, grande influenciadora no desenvolvimento econômico e social do país, é responsável por um grande consumo de matéria prima e produção de resíduos. O gesso, em especial, apresenta crescimento expressivo, sobretudo na região Nordeste, devido ao Pólo Gesseiro do Araripe. Considerando os graves problemas de seu descarte incorreto à natureza, surge o desafio de sua reciclagem. O objetivo desta pesquisa é analisar diversos percentuais de resíduo de gesso a serem adicionados à pasta de gesso, com e sem aditivo retardador (citrato de sódio), quanto a propriedades físicas, mecânicas e reológicas, visando à produção de componentes. Para tanto, o resíduo passou por processo fisico-químico de reciclagem para ser substituído pelo gesso, em massa, nos percentuais de 25%, 50%, 75% e 100%. O estudo do desempenho do material foi feito através dos ensaios de granulometria, massa unitária, método do mini-slump, calorimetria, método squeeze-flow, resistência à compressão e dureza superficial. Os resultados mostraram que o gesso reciclado (GR) não prejudica excessivamente as propriedades estudadas, sendo admissível a substituição de até 50% do GR na produção da pasta para confecção de componentes, respeitando-se as recomendações do processo de reciclagem e relação água/gesso.

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          Most cited references 12

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          Projection of Construction and Demolition Waste in Norway

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            Estimation of regional building-related C&D debris generation and composition: case study for Florida, US.

            Methodology for the accounting, generation, and composition of building-related construction and demolition (C&D) at a regional level was explored. Six specific categories of debris were examined: residential construction, nonresidential construction, residential demolition, nonresidential demolition, residential renovation, and nonresidential renovation. Debris produced from each activity was calculated as the product of the total area of activity and waste generated per unit area of activity. Similarly, composition was estimated as the product of the total area of activity and the amount of each waste component generated per unit area. The area of activity was calculated using statistical data, and individual site studies were used to assess the average amount of waste generated per unit area. The application of the methodology was illustrated using Florida, US approximately 3,750,000 metric tons of building-related C&D debris were estimated as generated in Florida in 2000. Of that amount, concrete represented 56%, wood 13%, drywall 11%, miscellaneous debris 8%, asphalt roofing materials 7%, metal 3%, cardboard 1%, and plastic 1%. This model differs from others because it accommodates regional construction styles and available data. The resulting generation amount per capita is less than the US estimate - attributable to the high construction, low demolition activity seen in Florida.
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              Estimation of the annual production and composition of C&D Debris in Galicia (Spain)

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                ac
                Ambiente Construído
                Ambient. constr.
                Associação Nacional de Tecnologia do Ambiente Construído - ANTAC (Porto Alegre, RS, Brazil )
                1678-8621
                April 2019
                : 19
                : 2
                : 33-43
                Affiliations
                Recife Pernambuco orgnameUniversidade de Pernambuco Brazil
                Recife Pernambuco orgnameUniversidade de Pernambuco Brazil
                Recife Pernambuco orgnameUniversidade de Pernambuco Brazil
                Article
                S1678-86212019000200033
                10.1590/s1678-86212019000200304

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 31, Pages: 11
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