Influência do agregado graúdo reciclado de resíduos da construção predial nas propriedades do concreto fresco e endurecido
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Data
2007-10-04
Autores
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Editor
Universidade Federal de Goiás
Resumo
Recycling waste materials is an efficient way to hinder environmental, social and
economic impacts of the civil construction industry. This dissertation aimed at verifying the
behavior of different concretes made of coarse recycled aggregate (AGR), mineral fractions
collected from the waste (RCD) of a high- rise apartment building (multiple floor building).
The RCD has been selectively collected at the building construction site and processed by a
jaw crusher. The study focused on the effects of gradual replacements of coarse natural
aggregate (AGN) by AGR where the fundamental properties of the fresh and hardened
concretes are concerned. The experiment involved the production of three dry
aggregate/ceme nt ratios: (3,5 / 1), (5 / 1) and (6,5 / 1) for each concrete family (zero%, 25%,
50%, 75% and 100% replacement contents of AGN by AGR), and thus 15 different concrete
mix proportions were manufactured. Workability, entrapped air, and density were the
variables analyzed in the fresh concretes. Furthermore, water absorption, density, total pores
volume, compressive strength, splitting-tensile strength, and initial-tangent modulus were the
properties studied in hardened concretes. The strengths of concretes with AGR contents are
lower than those of corresponding reference concretes (zero% of replacement content of AGN
by AGR). However, reductions in the cement content in mixtures of the concretes produced
with AGR showed compressive and splitting-tensile strengths values nearer to those of the
reference concrete family. The experiment allows for the conclusion that concretes produced
from AGR of RCD can be used for several purposes in civil construction, if the management
of concrete mix proportions and the control of quality are performed under the liability of
capable and qualified professionals.
Descrição
Palavras-chave
Gerenciamento de resíduos da construção , Desenvolvimento sustentável , Resíduos de
construção e demolição , RCD , Agregados reciclados , Concreto. , Construction wastes management , Sustainable development , Construction & demolition wastes , C&D wastes , Recycled aggregates , Concrete , 1. Engenharia civil resíduos de construção reciclagem.
2.Entulho de construção reciclagem aproveitamento.
Citação
NUNES, Wesley Carlos. Influência do agregado graúdo reciclado de resíduos da
construção predial nas propriedades do concreto fresco e
endurecido. 2007. 202 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2007.