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Prof. Dr. Valquíria Santos
Universidade Federal de Itajubá - UNIFEI

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0 Materials
0 Mortars
0 self-compacting concrete
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Journal article
Published: 21 October 2020 in Sustainability
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The inadequate disposal of household appliances by consumers and industries have annually been generating enormous amounts of polymeric waste (PW). So, the interest in reuse of PW in civil construction has increased. The production of new cementitious materials, such as concrete with PW, proves to be a promising solution to inappropriate disposal of this waste. In this study, self-compacting concrete (SCC) was developed with partial replacement of the coarse aggregates by polymeric waste (PW) from the recycling of refrigerators. In the SCC reference mixture, Portland cement, silica fume, sand, gravel and superplasticizer were used. The study also grouped the gravel as replaced by 5%, 10%, 15% and 20% of PW. In order to analyze the samples, the following tests were used: spreading, viscosity, passing ability, compressive strength, tensile strength, microstructure, modulus of elasticity, specific gravity, absorption, voids index and electrical resistivity. The SCC found showed adequate homogeneity and viscosity, staying within the normative parameters. The mechanical resistance was above 20 MPa; specific mass between 1870 to 2260 kg/m3; modulus of elasticity ranged from 34 to 14 GPa; and electrical resistivity between 319 to 420 ohm.m. Due to the mechanical resistance, the SCC with PW can be used for structural purposes and densely reinforced structures such as pillars, beams and foundation elements.

ACS Style

Lucas Silva; Josimara Silva; Matheus Francisco; Vander Ribeiro; Michel Souza; Patricia Capellato; Marcelo Souza; Valquíria Santos; Paulo Gonçalves; Mirian Melo. Polymeric Waste from Recycling Refrigerators as an Aggregate for Self-Compacting Concrete. Sustainability 2020, 12, 8731 .

AMA Style

Lucas Silva, Josimara Silva, Matheus Francisco, Vander Ribeiro, Michel Souza, Patricia Capellato, Marcelo Souza, Valquíria Santos, Paulo Gonçalves, Mirian Melo. Polymeric Waste from Recycling Refrigerators as an Aggregate for Self-Compacting Concrete. Sustainability. 2020; 12 (20):8731.

Chicago/Turabian Style

Lucas Silva; Josimara Silva; Matheus Francisco; Vander Ribeiro; Michel Souza; Patricia Capellato; Marcelo Souza; Valquíria Santos; Paulo Gonçalves; Mirian Melo. 2020. "Polymeric Waste from Recycling Refrigerators as an Aggregate for Self-Compacting Concrete." Sustainability 12, no. 20: 8731.

Journal article
Published: 11 May 2020 in REEC - Revista Eletrônica de Engenharia Civil
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RESUMO: O presente trabalho compara experimentalmente os resultados de ensaios à flexão a quatro pontos de vigas de concreto com e sem adição de fibras de aço. O objetivo principal do trabalho foi analisar as influências que as fibras de aço tendem em modificar o surgimento de patologias relacionadas à fissuração do concreto. Este trabalho se justifica pelo fato de que a implementação de elementos de reforço ao esforço de flexão não é amplamente explorada no Brasil, mesmo tendo ocorrido um crescimento considerável nas últimas décadas. Vigas com adição de fibras não é um método totalmente difundido no Brasil, entretanto pisos de concreto e lajes reforçados com fibras já são mais usuais nas construções do país Para análise do comportamento à flexão foram realizados ensaios de laboratório com oito corpos de prova, moldados com e sem fibras, a maioria com entalhe induzindo a propagação vertical da fissura na região central da viga. Foi utilizado um baixo teor de fibras de aço (0,25%) para não implicar na trabalhabilidade do concreto e, com isso, testar um material que pode ser confeccionado em situações usuais da construção civil. Para o teor de fibras estudado observou-se um acréscimo de 26,6% no valor da carga máxima atingida. Outro fator relevante foi que não houve dificuldades em relação a trabalhabilidade do concreto quando adicionado as fibras. Os resultados obtidos sobre a resistência comprovaram eficiência quando se usou as fibras no ensaio a flexão. The present work compares the results experimentally of four-point bending tests of concrete beams with and without addition of steel fibers. The main objective of this work was to analyze the influence of steel fibers in modifying the appearance of pathologies related to concrete cracking. This work is justified by the fact that the implementation of reinforcement elements to the flexion effort is not widely explored in Brazil, even though there has been a considerable growth in the last decades. Beams with addition of steel fibers are not method used in Brazil, however, concrete floors and fiber-reinforced slabs are more common in the country's constructions. For bending behavior analysis, laboratory tests were performed with eight test specimens, molded with and without fibers, most of them with notch, inducing vertical propagation of the crack in the central region of the beam. It was use of a low content of steel fibers (0,25%) to avoid the workability of the concrete and, with this, to test a material that can be made in usual civil construction situations. For the fiber content studied, there an increase of 26,6% in the maximum load value. Another relevant factor was that there were no difficulties in relation to the workability of the concrete when added the fibers. The results obtained on the resistance proved efficiency when the fibers were used in the bending test.

ACS Style

Valquiria Claret Dos Santos; Paulo Cesar Gonçalves; Adinele Gomes Guimarães; Felipe Ott Caballer. VIGAS DE CONCRETO REFORÇADO COM FIBRAS DE AÇO SUBMETIDAS À FLEXÃO. REEC - Revista Eletrônica de Engenharia Civil 2020, 16, 01 -15.

AMA Style

Valquiria Claret Dos Santos, Paulo Cesar Gonçalves, Adinele Gomes Guimarães, Felipe Ott Caballer. VIGAS DE CONCRETO REFORÇADO COM FIBRAS DE AÇO SUBMETIDAS À FLEXÃO. REEC - Revista Eletrônica de Engenharia Civil. 2020; 16 (1):01-15.

Chicago/Turabian Style

Valquiria Claret Dos Santos; Paulo Cesar Gonçalves; Adinele Gomes Guimarães; Felipe Ott Caballer. 2020. "VIGAS DE CONCRETO REFORÇADO COM FIBRAS DE AÇO SUBMETIDAS À FLEXÃO." REEC - Revista Eletrônica de Engenharia Civil 16, no. 1: 01-15.

Research article
Published: 01 March 2020 in Environmental Quality Management
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Environmental issues have been at the center of society's concerns for a long time. Recently, this kind of concern is growing even more due to the damage caused to the environment by electrical and electronic product waste. Based on this same concern, this work aimed to analyze, through a literature review, the production and treatment of electronic waste in today's world, with an emphasis on Brazil and China. The articles reviewed point to an increase in the production of this type of waste, in both Brazil and China, and reveal that the current processes of treatment of electronic waste mostly aim to obtain profit through the recovery of precious metals such as copper. This paper concluded that although Brazil is one of the major producers of e‐waste, more than 90% of its e‐waste has not had a proper final destination. This deficiency in e‐waste treatment in Brazil is mainly due to financial factors and the lack of a robust educational policy focused on the environment. Thus, this work suggests the implementation of an effective educational policy aimed at environmental conservation, as well as investments in research on recycling methods in Brazil, especially on the use of e‐waste as an aggregate in the manufacture of concrete.

ACS Style

Carlos Alberto De Albuquerque; Carlos Henrique Pereira Mello; José Henrique De Freitas Gomes; Valquíria Claret Dos Santos; Julia Vidigal Zara. E‐waste in the world today: An overview of problems and a proposal for improvement in Brazil. Environmental Quality Management 2020, 29, 63 -72.

AMA Style

Carlos Alberto De Albuquerque, Carlos Henrique Pereira Mello, José Henrique De Freitas Gomes, Valquíria Claret Dos Santos, Julia Vidigal Zara. E‐waste in the world today: An overview of problems and a proposal for improvement in Brazil. Environmental Quality Management. 2020; 29 (3):63-72.

Chicago/Turabian Style

Carlos Alberto De Albuquerque; Carlos Henrique Pereira Mello; José Henrique De Freitas Gomes; Valquíria Claret Dos Santos; Julia Vidigal Zara. 2020. "E‐waste in the world today: An overview of problems and a proposal for improvement in Brazil." Environmental Quality Management 29, no. 3: 63-72.