Banca de DEFESA: NAYARA JHÉSSICA MARQUES DA FONSÊCA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : NAYARA JHÉSSICA MARQUES DA FONSÊCA
DATA : 26/03/2018
HORA: 09:00
LOCAL: A DEFINIR
TÍTULO:

POTENTIAL OF CEMENT SUBSTITUTION BY LIME IN SOIL-CEMENT BRICKS WITH CERAMIC WASTE INCORPORATION



PALAVRAS-CHAVES:

Construction; ceramic waste; mechanical strength; durability; microstructure



PÁGINAS: 82
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

Civil construction is an important industry in the economic system in which it is embedded. In addition to generating employment and income, the sector also contributes by modifying the natural landscape to guarantee society housing, security and well-being. However, the high indices of natural resources used by the construction, as well as the large amounts of waste generated by it, raise great concern about the negative environmental impact generated and the serious consequences. Considering the high energy consumption in the cement manufacturing process, the large amounts of CO2 emitted during clinker firing, the availability of hydrated lime in the Northeast region of Brazil, and also the high loss rate involving the ceramic blocks used in sealing masonry, this work evaluated the potential of cement substitution by lime in soil-cement bricks with ceramic waste (CW) incorporation. Ternary compositions of soil + 12% cement + 4% CR, soil + 12% hydrated lime + 4% CW, quaternary soil + 6% cement + 6% hydrated lime + 4% CW were developed. The compositions were also formulated without addition of CW to serve as reference and enable the analysis of the influence of the residue on the behavior of the bricks produced. After the pressing and curing processes of the bricks, they were submitted to tests of mechanical strength, water absorption and modified durability. Then, the microstructure of these materials was analyzed by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) of the fracture surfaces. Given the silica and alumina contents present in both the used soil and the finely ground ceramic residue, the so-called pozzolanic reaction occurs, in which the calcium hydroxide resulting from the hydration of the cement and / or lime reacts with the aforementioned chemical compounds , forming hydrated calcium silicates and aluminates that contribute to the improvement of the physical and mechanical properties of the compositions studied. In this context, it was expected that the produced bricks presented good conditions of resistance to simple compression, water absorption and durability in accordance with the recommendations of the current Standards for bricks in non-structural application. The experimental results showed that the ternary composition soil + 12% cement + 4% CW presented more significant values. Among the quaternary mixtures, the soil formulation + 6% cement + 6%  hydrated lime and 4% CW showed the best performance.



MEMBROS DA BANCA:
Externo à Instituição - ANDREZA KELLY COSTA NOBREGA - UFERSA
Externo ao Programa - 2331385 - JAQUELIGIA BRITO DA SILVA
Externo à Instituição - VAMBERTO MONTEIRO DA SILVA - IFPB
Presidente - 1149564 - WILSON ACCHAR
Notícia cadastrada em: 20/02/2018 11:16
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