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    Papers in International JournalsChapters/ Papers in International BooksChapters/ Papers in National BooksCommunications in International ConferencesCommunications in National ConferencesMSc ThesesBooksProceedingsPatentsTechnical/ Scientific ReportsPhD Theses
    @inproceedings {2487,
    	title = {A{\c c}{\~a}o Combinada da Carbonata{\c c}{\~a}o e dos I{\~o}es Cloreto em Bet{\~o}es com Cinzas Volantes},
    	journal = {CLB MCS 2016 - II Congresso Luso Brasileiro de Materiais de Constru{\c c}{\~a}o Sustent{\'a}veis},
    	year = {2016},
    	month = {2016-11-21 00:00:00},
    	address = {Jo{\~a}o Pessoa, Brasil},
    	abstract = {

    A incorpora{\c c}{\~a}o de cinzas volantes (CV) em matrizes ciment{\'\i}cias tem sido frequentemente utilizada a fim de tornar a matriz mais resistente {\`a} a{\c c}{\~a}o dos cloretos. Contudo, sabe-se que o Ca(OH)2 existente na matriz {\'e} parcialmente consumido pelas rea{\c c}{\~o}es pozol{\^a}nicas, o que facilita o avan{\c c}o da frente de carbonata{\c c}{\~a}o. Uma vez que a a{\c c}{\~a}o dos i{\~o}es cloreto e da carbonata{\c c}{\~a}o est{\~a}o, normalmente, na origem do fen{\'o}meno de corros{\~a}o do a{\c c}o no bet{\~a}o, {\'e} importante perceber o comportamento de bet{\~o}es com incorpora{\c c}{\~a}o de CV quando a estrutura {\'e} submitida {\`a} a{\c c}{\~a}o combinada destes dois agentes agressores. Desta forma, estudou-se a influ{\^e}ncia da profundidade de carbonata{\c c}{\~a}o no coeficiente de difus{\~a}o de cloretos. Para tal, foram utilizadas amostras de bet{\~a}o com uma percentagem de CV em substitui{\c c}{\~a}o da massa de ligante de 40\%, cimento CEM I 42,5 R e com uma raz{\~a}o {\'a}gua/ligante de 0,5. Ap{\'o}s o per{\'\i}odo de cura, 90 dias, as amostras foram carbonatadas sob as seguintes condi{\c c}{\~o}es: 20{\textordmasculine}C, 55\%HR e 4\%CO2, durante 1, 2 e 3 meses. Ao fim de cada per{\'\i}odo de carbonata{\c c}{\~a}o, foram ensaiadas as amostras carbonatadas, atrav{\'e}s do ensaio de migra{\c c}{\~a}o em regime n{\~a}o estacion{\'a}rio de acordo com a especifica{\c c}{\~a}o LNEC E463. Os resultados obtidos permitiram concluir que o efeito combinado dos agentes agressores estudados traduz-se num aumento da penetra{\c c}{\~a}o de cloretos no bet{\~a}o com CV. Acredita-se que o aumento da profundidade de carbonata{\c c}{\~a}o, ao longo dos tr{\^e}s per{\'\i}odos de ensaio, foi o respons{\'a}vel pelo aumento do coeficiente de difus{\~a}o de cloretos que esteve na ordem dos 50\%, do primeiro para o terceiro m{\^e}s.

    }, keywords = {Bet{\~a}o, Carbonata{\c c}{\~a}o, Cinzas volantes, i{\~o}es cloreto, migra{\c c}{\~a}o}, author = {Camacho, G. and Malheiro, R. and Cam{\~o}es, A. and Meira, G.} }

    About CTAC

    The Centre for Territory, Environment and Construction (CTAC) is a research unit of the School of Engineering of University of Minho (UMinho), recognised by the “FCT – Fundação para a Ciência e Tecnologia” (Foundation for Science and Technology), associated to the Department of Civil Engineering (DEC), with whom it shares resources and namely human resources.

    Currently CTAC aggregates 25 researchers holding a PhD of which 20 are faculty professors of the Civil Engineering Department. Read more


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    Centro de Território, Ambiente e Construção
    Escola de Engenharia da Universidade do Minho
    Campus de Azurém
    4800-058 Guimarães, Portugal

    Phone: + 351 253 510 200 (517 206)
    Fax: + 351 253 510 217

    Email: geral@ctac.uminho.pt


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