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https://doi.org/10.17012/entac...
Article . 2014 . Peer-reviewed
Data sources: Crossref
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Influência de aditivo retardador de pega na pasta de gesso com resíduo de gesso calcinado

Authors: Luis Sergio Mesquita; Yêda Póvoas;

Influência de aditivo retardador de pega na pasta de gesso com resíduo de gesso calcinado

Abstract

A utilizacao do gesso na construcao civil vem tendo um crescimento exponencial devido a sua alta qualidade, baixo custo e facilidade de manuseio. Durante sua aplicacao existe a geracao de grande quantidade de residuo, e por consequencia, um acrescimo de custo devido a necessidade de descarte adequado. O objetivo desta pesquisa e estudar uma forma de reaproveitamento deste residuo na propria obra, calcinando-o e realizando sua mistura com pasta de gesso e retardador de pega (citrato de sodio), visando verificar as alteracoes que ocorrem em suas propriedades mecânicas e no tempo de utilizacao, buscando a reducao de custos com o descarte e a minimizacao do impacto ambiental. Como metodologia, o gesso e o residuo foram caracterizados de acordo com os ensaios recomendados pela NBR 13207 e, utilizando-se um calorimetro de conducao isotermica, foram avaliados os tempos de pega e o tempo de utilizacao, por meio do calor de hidratacao. Para tanto, houve substituicao do gesso (em porcentagem de massa) por residuo de gesso calcinado nas proporcoes 0, 10, 50, 90 e 100%, utilizando-se citrato de sodio na proporcao de 0,06% em relacao aos materiais secos. O beneficiamento do residuo foi feito atraves da moagem, peneiramento, retificacao da sua composicao granulometrica e calcinacao a 150°C pelo periodo de uma hora. A fim de reduzir o residuo depositado no meio ambiente e poupar a materia prima que e esgotavel, os resultados indicam a possibilidade de se utilizar a mistura com 50% de residuo e 0,06% de citrato de sodio.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
bronze