Banca de DEFESA: ÍTALO VALE MONTE JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ÍTALO VALE MONTE JÚNIOR
DATA : 25/08/2017
HORA: 14:00
LOCAL: AUDITÓRIO DO CT
TÍTULO:

INFLUENCE OF THE RECYCLED CONCRETE AGGREGATE IN THE MECHANICAL BEHAVIOR OF MIXED MORTARS FOR COATING USE

 


PALAVRAS-CHAVES:

Waste from construction. Recycled concrete aggregate. Mortar. Performance.


PÁGINAS: 130
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Construção Civil
ESPECIALIDADE: Materiais e Componentes de Construção
RESUMO:

The construction activity promotes a large environmental liability due to the high consumption of non-renewable natural resources and energy, as well as generating large volumes of solid waste that are often inadequately destined. Thus, the use of solid construction and demolition wastes as a recycled aggregate becomes a viable alternative to mitigate the impact of construction on the environment. The recycled concrete aggregate (RCA), especially the coarse fraction (RCAC) with a diameter greater than 4 mm, presents superior quality to the mixed recycled aggregates, and can be used in the production of new concretes. On the other hand, the fine fraction (RCAF) with particles smaller than 4 mm contains a higher content of mortar adhered to the grain of RCA and presents inferior quality to the RCAC, restricting its use in new concretes and / or mortars. Thus, the objective of this research is to evaluate the behavior of mortars for coating with the substitution of natural aggregate (NA) for concrete residue (RCAF). From an experimental design, the lime / cement ratio (from 0.3 to 1.7) and the substitution of NA by RCAF (from 15 to 85%) were evaluated in the production of 14 mortars, 9 of them with RCAF and 5 of reference, standardizing the grain size profile of the NA and RCAF, the binder / aggregate ratio in 1: 3 and the consistency index in 260 mm. The physical, chemical, mineralogical and microstructural characteristics of the aggregates were evaluated by analysis of the unit mass, specific mass, laser granulometry, BET, FRX, DRX and MEV, as well as Los Angeles Abrasion, mortar content, water absorption and Pozzolanic activity for RCAF. Then, the mortar properties in the anhydrous, fresh and hardened states were evaluated through the granulometry tests by sieving, bulk density, consistency, weight variation, water absorption by capillarity and immersion, flexural tensile and compressive strenght, dynamic modulus of elasticity, adhesion strength and susceptibility cracking. It was found that the average values of mortar (31%), Los Angeles (30%), water absorption (15%) and density (1.09 g / cm3) in the ARCF were similar Literature. In the mortars, a reduction of mass density occurred with the increase of the RCAF, which also contributed to the increase of tensile strengths in flexion, compression and modulus of elasticity. No cracks were observed at 56 days of cure, in ARCF mortars, the adhesion strength obtained minimum acceptable values (0.3 MPa) for coating, but did not present statistical significance at 95% confidence.


MEMBROS DA BANCA:
Externo à Instituição - ANA CECILIA VIEIRA DA NOBREGA - UFPE
Externo ao Programa - 671.403.354-00 - KLEBER CAVALCANTI CABRAL - UFERSA
Presidente - 1507841 - MARIA DAS VITORIAS VIEIRA ALMEIDA DE SA
Notícia cadastrada em: 15/08/2017 11:18
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