Banca de QUALIFICAÇÃO: ANTONIO ALEX MATIAS LÊU

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANTONIO ALEX MATIAS LÊU
DATA : 17/10/2019
HORA: 15:30
LOCAL: CAMPUS JUAZEIRO DO NORTE - UFCA
TÍTULO:

ESTUDO DE VIABILIDADE DA UTILIZAÇÃO DO RESÍDUO DO CALCÁRIO LAMINADO NA EXECUÇÃO DE ESTACAS EM SOLOS COLAPSÍVEIS

PALAVRAS-CHAVES:

Laminate Limestone, Residue, Dry Concrete, Excavated Excavated Piles, Collapsible Soils.

PÁGINAS: 78
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Collapsible soils are unsaturated soils that suffer volume reductions when they increase their moisture content under practically constant stresses. These soils have been found in various regions of the country, especially in semi-arid climates. In the Cariri Region, inland of Ceará, several buildings present pathologies that may be associated with soil collapse. On the other hand, the Cariri Cearense region presents itself as an important mineral pole, in terms of its rich reserve of laminated sedimentary limestone, commercially known as Pedra Cariri, used as flooring and cladding in civil construction. However, the laminated limestone mining and beneficiation processes for floor and tile manufacture produce a large amount of waste (70% is wasted) responsible for major damage to the environment. Thus, this paper aims to present results of a technical and environmental feasibility study of the use of laminated limestone residue to make cuttings that cross collapsible soils. The basic material used for this work was Cariri Cearense (Nova Olinda) laminated limestone residue, as well as cement, sand and gravel. In the laboratory stage, the materials were characterized and then the dry-type concrete specimens were molded through five mass traits: 0%, 30%, 50%, 80% and 100% residue. The obtained results demonstrated the viability of the process from the technical and environmental point of view in the substitution of sand by the waste in the proportions of 30% and 50%. On the other hand, for the other contents, compressive strengths lower than the standard concrete were obtained for samples with 80% and 100% residue. This is mainly due to an increase in porosity in the transition zone of these materials, resulting from poor packing between the aggregates, but which nonetheless allows the use of these concretes for the manufacture of non-structural elements such as sidewalks and precast floors, among others. In the field stage, it is planned to make the cuttings in the UFCA Experimental Field where the study will be carried out through load tests. For this purpose will be made two cuttings apilo, one with conventional concrete and another with laminated limestone residue in partial replacement of sand in the percentage of 50%, considering this choice due to the use of waste in greater quantity. Considering that this work aims to evaluate the technical and environmental feasibility of laminated limestone residue (commonly known as cariri stone), for use as an alternative raw material for the production of piles, and considering the positive results of concrete strength. With the incorporation of the residue, it is possible to make concrete with accepted strength for the execution of piles, and that with the planned tests (which will be performed after qualification) in the piles, it is intended to evaluate in situ the actual conditions directly in the foundations. know the concrete / stake / soil interaction. Thus, it is expected that the results obtained in the load capacity test will present acceptable conditions in relation to the resistance x soil x collapse tripod with the use of limestone residue as an alternative raw material in the making of apiloada foundation piles, finding that its technical and environmental viability.

MEMBROS DA BANCA:
Externo à Instituição - ALEX JUSSILENO VIANA BEZERRA - IFCE
Externo à Instituição - ALINE FIGUEIREDO NÓBREGA DE AZERÊDO - UFPE
Presidente - 1657653 - ANA PATRICIA NUNES BANDEIRA
Externo ao Programa - 1276623 - JOAO BARBOSA DE SOUZA NETO