Avaliação da durabilidade dos concretos fornecidos por centrais dosadoras
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2018-09-28
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Universidade Federal de Goiás
Resumo
This research aimed to evaluate the mechanical behavior and durability of concrete supplied by
premixed concrete batching plants with the strength classes most used by the main construction
companies in the region of Goiânia/GO (C25, C30, C35, C40 and C45, being conventional
pumped concrete with maximum dimension characteristic of coarse aggregate of 19 mm and
consistency class S50, slump 50 ≤ to < 100 mm). The durability parameters used were obtained
through accelerated and natural carbonation, chloride migration, total absorption, capillary
absorption, water permeability, electrical resistivity and ultrasound tests. In terms of
mechanical properties, compressive strength and modulus of elasticity were the studied
parameters. Finally, the impact on the durability of the concrete produced by the increase in the
water/binder ratio was evaluated, considering the environment in which the structural element
is inserted, as well as the effect of different constituent materials present in each concrete (in
this context of durability). Based on the results obtained, it was found that a significant part of
the concrete does not comply with the maximum water/cement ratio recommendations of
ABNT NBR 6118: 2014, and its values are, in many cases, much higher. This causes an
important drop in the performance regarding the carbonation of concrete, which will certainly
result in a reduction in the useful life of the concrete structure and in non-compliance with the
current minimum VUP requirements of 50 years for the structural system (according to ABNT
NBR 15575: 2013). As for chlorides, there is an important influence of the water/binder ratio,
but the effects resulting from the type of cement used were very significant in the results. In
this regard, an important contribution of mineral additions in reducing the transport of chlorides
in concrete was found.
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PAULA, M. C. Avaliação da durabilidade dos concretos fornecidos por centrais dosadoras. 2018. 128 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2018.