Influência da substituição parcial do cimento portland pela cinza do bagaço de cana-de-açúcar (CBC) residual no concreto
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2010-12-21
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Universidade Federal de Goiás
Resumo
The Sugar Cane Bagasse Ash (SCBA) is a major waste of the sugar cane industry and one of
the most bulky solid wastes produced by Brazilian Industries. This industry annually produces
millions of tons of SCBA from cane bagasse burning in the cogeneration of energy.
According to Brazilian estimatives of sugar cane production to the year 2010, it is been
expected a production of 697 million tons of sugar cane, that can generate more than 181
million tons of bagasse with 50% moisture and from that 4,5 millions tons of SCBA, if
considering that all sugar cane will be used to milling and the use of bagasse as a fuel to
boilers. The aim of the study was to evaluate the influence of the partial replacement of CPVARI
Portland Cement by the residual SCBA obtained from an industry on the State of Goiás
on mechanical properties of ordinary and high strength concrete, as well as properties related
to durability. Concrete was characterized even fresh. The replacement content used were 0%,
5%, 10% and 20% of residual SCBA, in mass. Before use, the SCBA was subjected to a
sieving process (opening mesh 1.19 mm), drying and grinding for 4 hours in a ball mill. Two
water/ binder relations (w/b), 0.37 and 0.60 were adopted, resulting 8 different concrete types.
The durability parameters were determined in transport mass assays and carbonation
resistance. The transport mass assays, as permeability assays, capillary absorption and by
immersion indicated an excellent level of replacement around 10% in both concrete. With
regard to carbonation depth was observed a small reduction in carbonation resistance as the
increased of replacement partial of Portland cement by SCBA. For the analysis of mechanical
strength using the CBC residual levels up to 10% did not affect the concrete properties.
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SILVEIRA, Daniel Antônio. Influence of partial replacement of Portland cement by crushed gray cane sugar (CBC) in the residual concrete. 2010. 110 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2010.