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TREATMENT OF RESIDUAL DIATOMITE EARTH FOR USE AS POZZOLAN IN CEMENTITIOUS MIXTURES



Author(s): Júlia G. Vieira, César A. Ponciano, Welles J. Oliveira, Leila A. C. Motta
Book Title: III Progress of Recycling in the Built Environment
Editor: I. Martins, C. Ulsen and S. C. Angulo
e-ISBN: 978-2-35158-158-2
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 101-108
Total Pages: 8
Language: English


Abstract: The problems of environmental pollution caused by industrial waste have attracted great interest in recent years, which has motivated the search for viable alternatives for the disposal of these, especially solid residues, as is the case of the diatomite earth used by industries in filtration processes. Construction is a sector of society that lies in accelerated growth, being responsible for much of the urban pollution, however this is also one of the sectors where part of waste generated can be reused. Pozzolanic materials enable the production of special cimentitious mixtures with lower energy consumption and cost of manufacture. The pozzolanic additions contribute to the greater durability of composites by reducing the calcium hydroxide content free. In this sense, treatments were investigated to adapt diatomite earth to the use as pozzolan in mixtures with Portland cement, since this present contaminants that affect the cement hydration reactions. Different combinations of times and temperatures of calcination were investigated to remove impurities present in it. Treated samples were characterized through the techniques of Thermogravimetric Analysis (TGA), X-Ray Diffraction (XRD) and pozzolanic activity index (Modified Chapelle´s method), in which the best result obtained was for the treatment of 2 hours to 650 ºC.


Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00


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