EVALUATION OF THE POZZOLANICITY OF FINE FRACTION OF CIVIL CONSTRUCTION WASTE (FCCW)

Reference Presenter Authors
(Institution)
Abstract
04-036 Nilson Santana de Amorim Júnior Amorim Júnior, N.S.(Federal University of Bahia); Andrade Neto, J.d.(Federal University of Bahia); SANTOS, T.A.(Federal University of Bahia); RIBEIRO, D.V.(Federal University of Bahia); Pozzolanic materials are siliceous or silicoaluminous materials that react with calcium hydroxide, formed during the hydration of the Portland cement, in the presence of water, forming hydrated calcium silicates (C-S-H), and thus increasing the compactness and strength of the cementitious matrix. Among the several types of pozzolanas used in civil construction, there are some old industrial residues, such as silica fume and fly ash, which, due to the use in civil construction, have added value, thus becoming byproducts. In this context, several residues that do not yet have a suitable destination have been evaluated for their pozzolanic properties, in order to provide adequate waste disposal and decrease the consumption of Portland cement, responsible for the generation of high amounts of CO2 to the atmosphere. Therefore, the present work aims to evaluate the pozzolanicity of the fine fraction of the civil construction waste, (FCCW). For this, initially, the material was characterized by X-ray fluorescence (XRF) and X-ray diffraction (XRD) and then had its pozzolanic activity evaluated through direct tests (modified Chapelle method and Fratini method), besides indirect tests (pozzolanic activity index with cement and lime). The results indicate that the FCCW has pozzolanic activity, evidencing the potentiality of the use of this residue.
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