Banca de DEFESA: DANYEL FLÁVIO LOPES DE PAIVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANYEL FLÁVIO LOPES DE PAIVA
DATA : 25/11/2016
HORA: 09:00
LOCAL: SETOR IV, BLOCO F, SALA 2
TÍTULO:

The influence of aggregate grafted in the mechanical resistance and properties of fracture of a concrete for rigid pavement.


PALAVRAS-CHAVES:

Pavement. Coarse aggregate. Mechanical strength. Fracture parameters.


PÁGINAS: 113
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Construção Civil
ESPECIALIDADE: Processos Construtivos
RESUMO:

The number of paving works performed in Brazil in recent years has increased considerably, especially the works whose rigid flooring solution has been adopted. However, compared to countries like the United States - US and developed European countries, for example Germany, it appears that the number of paved highways in Brazil is still small, especially with regard to the percentage of highways paved with Portland cement concrete (rigid pavement) compared to the use of asphalt concrete (flexible pavement). The increasing use of Portland cement concrete as paving solution has led to the development of several studies looking improve enforcement techniques and the improvement in the choice of materials and features that may favor the durability of the pavement as a whole. Despite this reality, this study aims to analyze the influence of coarse aggregate on the mechanical strength and fracture properties of concrete for rigid flooring, used in duplication of work and adjustment capacity of the BR-101 / RN, Northeast corridor between the cities of Parnamirim / RN and Ares / RN. In the first analysis, it was varied coarse aggregate the content of the mark, where the percentage of coarse aggregate in terms of the total number of households was 59% to 69%. For the second analysis was the reference mark reproduced only with aggregate maximum diameter 12.5 mm, 19 mm and 25 mm. For both analyzes were made to axial compressive strength test, traction in flexion and diametrical compression, elastic modulus, fracture toughness and fracture energy. The analysis results of the effects of the contents showed that stroke with less content of coarse aggregate - T (59%) showed higher mechanical resistance with respect to the mark - REF (64%), with 8% increments for resistance to compression and tension in flexion, while its fracture toughness and fracture energy decreased by 7% and 12%, respectively. But the trace-added content - T (69%) had a decrease in the mechanical strength by 12% for compressive strength and traction in flexion, but increased fracture toughness and energy of 4% fracture and 2%, respectively . Since the results of analysis of influence of the maximum diameter of coarse aggregate showed that reducing the maximum aggregate diameter caused increased mechanical strength and decreased fracture parameters. The VAR trace. 12, showed increases compared to the reference line (REF) of 12% for the compressive strength and 19% for the tensile strength in bending, but with 38% reductions in fracture toughness and 22% for energy fracture. The greatest results of fracture parameters in this analysis were presented by the mark - REF, but with the difference to be insignificant in relation to the VAR trait. 25


MEMBROS DA BANCA:
Presidente - 022.621.844-96 - MARCOS ALYSSANDRO SOARES DOS ANJOS - IFRN
Interno - 1507841 - MARIA DAS VITORIAS VIEIRA ALMEIDA DE SA
Externo à Instituição - ANA CECILIA VIEIRA DA NOBREGA - UFPE
Notícia cadastrada em: 22/11/2016 10:38
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