Argamassa geopolimérica: estudo da degradação por sulfato de sódio e ácido sulfúrico

Mauri, J.; Dias, Dylmar Penteado; Cordeiro, Guilherme Chagas; Dias, Ângela

doi:10.1590/s1517-70762009000300015

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…Mauri et al [29] studied the durability of a geopolymer mortar in highly aggressive environments, compounds by sodium sulfate and sulfuric acid, in solutions with 10wt% and 5wt% concentration, respectively. The geopolymer mortar was produced with metakaolin, Portland cement (source of CaO), potassium hydroxide and alkaline sodium silicate.…”

Section: Geopolymers Studies In Brazilmentioning

confidence: 99%

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Geopolymers Studies in Brazil: A Meta-Analysis and Perspectives

Geraldo¹,

Camarini²

2015

IJET

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Abstract-Geopolymers have stimulated a great interest since it appeared years ago. Many researchers are investigating the structures, characteristics and the formation processes of this promising technology. These materials are a type of binder that in its production sends less carbon dioxide to the atmosphere and requires lower energy consumption when compared to the Ordinary Portland Cement; moreover, it can demonstrate excellent mechanical properties. Brazilian scientific community is also developing researches in this field, and the new policy about the management and disposal of waste, the high growth of the civil construction, among other facts, tends to increase the interest about geopolymers in the country. The aim of this work is to make a meta-analysis of the literature about geopolymers, showing some studies and perspectives about this theme in Brazil.

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Section: Geopolymers Studies In Brazilmentioning

confidence: 99%

“…Compare the microstructure of a geopolymer concrete with the microstructure of a Portland cement-based concrete Mauri et al [29] 2009 Analyze the durability of a geopolymer mortar in aggressive environments…”

Section: Geopolymers Studies In Brazilmentioning

confidence: 99%

Geopolymers Studies in Brazil: A Meta-Analysis and Perspectives

Geraldo¹,

Camarini²

2015

IJET

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“…These residues end up being improperly discarded, usually causing negative impacts to the environment. Their powder is also responsible for severe public health problems [4][5]. These residues were classified into two types: the first one is quartzite powder, resulting from the abrasion between the saw blade and the rock plates.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior and durability of mortars with quartzite and Portland cement after sulfate attack

et al. 2019

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The residues of ornamental rocks, especially quartzite, cause great environmental impact. More impulse has been given to research on the recycling of these residues over the last years, particularly for use as aggregates in concrete and mortar. Nevertheless, the studies conducted so far do not mention the behavior of the mortar blended with aggregates coming from residues of ornamental rocks when under chemical attacks in sulfate-rich environment. Thus, in the present study it was sought to add quartzite residues to the mortar, verifying its mechanical behavior and its durability when attacked by sodium sulfate (Na2SO4). The durability of the mortar blended with quartzite residues under sulfate attack was evaluated by the dimensional variation of the test specimens when immersed in sodium sulfate solution, according to the methodology of the NBR 13583 standard. Were used the following complementary techniques: simple compressive strength, X-ray diffraction and thermogravimetric and differential analysis. From the tests, it was verified that the mortars, after attack of sodium sulfate, presented dimensional expansions superior to 0.06%, as well as increased mechanical strength. Therefore, although it was found that the specimens incorporated with quartzite residues were attacked by sulfate, it was observed that it was not able to form sufficient secondary ettringite to mechanically damage the specimens submitted to the sodium sulfate attack.

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“…Desde que foram desenvolvidos, as pesquisas com esses materiais se dão principalmente na área de engenharia civil, devido à sua potencial substituição aos materiais cimentícios. As argamassas geopoliméricas já foram alvo de diversas pesquisas em comparação com argamassas de cimento Portland, entre elas a avaliação da resistência ao ataque por ácidos e sulfatos [4], resistência à elevadas temperaturas [5] e aderência ao aço [6], apresentando, em geral, um desempenho superior aos materiais de referência.…”

Section: Introductionunclassified

Vigas de concreto reparadas com argamassa geopolimérica

et al. 2018

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RESUMO Este trabalho avaliou a eficácia de uma argamassa geopolimérica como material para recuperação de vigas de concreto convencional, objetivando restaurar o caráter monolítico e a capacidade portante inicial da estrutura reparada. Para isso, vigas de concreto reabilitadas com argamassa geopolimérica e com argamassa de reparo comercial foram analisadas e comparadas com vigas de referência sem reparo, por meio de ensaios de resistência à tração na flexão e de resistência de aderência ao cisalhamento na flexão. Os resultados mostram que as maiores deflexões ocorreram para os corpos de prova recuperados com argamassa geopolimérica (quando comparadas às vigas de referência de concreto monolítico) sem, no entanto, haver aumento considerável na carga de ruptura, justificado pelo baixo módulo de elasticidade longitudinal do material de reparo. As vigas recuperadas com argamassa geopolimérica apresentaram comportamento de ruptura muito semelhante ao das vigas de referência, ou seja, comportaram-se monoliticamente, ao contrário das recuperadas com argamassa comercial, que apresentaram descolamento da interface substrato/reparo. Os resultados sugerem que a argamassa geopolimérica possui potencial para ser utilizada como material alternativo em reparo de vigas de concreto convencional devido, principalmente, à aderência satisfatória ao concreto do substrato, à carga de ruptura próxima à da viga monolítica de referência e à melhor qualidade em relação à argamassa comercial.

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Argamassa geopolimérica: estudo da degradação por sulfato de sódio e ácido sulfúrico

Cited by 5 publications

References 3 publications

Geopolymers Studies in Brazil: A Meta-Analysis and Perspectives

Geopolymers Studies in Brazil: A Meta-Analysis and Perspectives

Mechanical behavior and durability of mortars with quartzite and Portland cement after sulfate attack

Vigas de concreto reparadas com argamassa geopolimérica

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