Banca de QUALIFICAÇÃO: HUEDLY CHAVES DOS SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : HUEDLY CHAVES DOS SANTOS
DATE: 30/04/2021
TIME: 14:00
LOCAL: meet.google.com/rxr-qoom-mfs
TITLE:

Evaluation of self-compacting concrete with RCD sand reinforced with steel and polyethylene fibers subjected to chloride accelerated

KEY WORDS:

Self-compacting concrete, recycled aggregate, steel fibers, polyethylene fibers, attack by chlorides.

PAGES: 28
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

The production of Construction Waste (CW) has been growing every year, and to dispose of it correctly has become a necessity. One solution is to reuse it as recycled aggregate in concrete. However, its use as a substitute for natural aggregates in concretes shows that there is a reduction in durability properties, as well as mechanical strengths. To alleviate this problem, the addition of fibers to the concrete and the use of self-compacting concrete (SCC) can be alternatives to improve the mechanical behavior, since the SCC use low water / cement ratios. Recently, the research has intensified the study of CW in concrete, with the objective of understanding its behavior. The objective of this paper is to evaluate the mechanical behavior under to compression and bending stress, the tenacity and the durability of self-compacting concrete with the addition of steel fibers and commercial polyethylene, combined with the use of recycled aggregate as fine aggregate with recycled aggregate from CW, fighting the action chloride ions through accelerated physical salt attack cycles. The definition of the fiber content and superplasticizer additive was carried out by means of the study of mortars to then verify the behavior of the SCC in the fresh state. In the hardened state, the behavior of compression, bending and toughness must be applied before and after cycles of wetting and drying in saline solution, in addition to the determination of the diffusion coefficient of chloride ions. Compressive strengths, flexural tensile strength and toughness are expected to show better results in SCC with fibers compared to SCC without fibers, especially in SCC with steel addition fibers. As for the behavior against the attack by chloride ions, there is no consensus on the behavior of concretes using CW, as there are works that indicate better behavior and there are works that indicate worse, in addition, there are few works that replace the fine aggregate with CW.

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