Banca de DEFESA: ANTONIO ALEX MATIAS LÊU

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANTONIO ALEX MATIAS LÊU
DATA : 13/03/2020
HORA: 14:00
LOCAL: UFCa campus Juazeiro
TÍTULO:

USE OF LAMINATED LIMESTONE RESIDUE IN PERFORMING PILES ON COLAPSIBLE SOILS

PALAVRAS-CHAVES:

dry concrete, foundations, laminated limestone residue, load test, load-settlement behavior.

PÁGINAS: 96
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The Cariri Cearense region presents itself as an important mineral pole, in terms of its rich reserve of laminated sedimentary limestone, known commercially as Pedra Cariri, used as flooring and cladding in civil construction. However, the mining and processing processes of laminated limestone for the manufacture of floors and coverings produce a high amount of waste (70% is wasted) responsible for major damage to the environment. Thus, the use of waste in civil construction is an excellent alternative to reduce the environmental impact and contribute to sustainable development. In this context, the present work aimed to study the reuse of laminated limestone residues in the concrete composition, replacing in bulk the fine aggregate (sand), aiming at its use in short excavated and apiled piles, carried out on collapsible soils. In the laboratory stage, the characterization of the materials was carried out and, subsequently, the molding of dry type concrete specimens, through five levels of residue: 0%, 30%, 50%, 80% and 100%. The results demonstrated the feasibility of the process from both a technical and environmental point of view in replacing the sand with the residue in the proportions of 30% and 50%, however, it was decided to make the pile, the mixture made up of 50% of waste, in view of a greater volume of use of the waste. In the field stage, piles were made at the Experimental Field of the Federal University of Cariri, where there are collapsible soil layers that lose resistance when flooded. For this purpose, two 15 cm diameter and depth, one with conventional dry concrete and the other with dry concrete containing laminated limestone residue, which were subjected to load test tests of the slow type, to verify the settlement of the soil in the state of natural moisture and after flooding. The pile attached with residue showed a repression of 1.30 mm when it was loaded up to 10T, with soil in natural humidity; after unloading up to 5T and intentional wetting of the soil, in this tension of 5T, the additional settlement was 3.11mm, totaling a settlement of 4.41mm. The conventional concrete pile supported on the soil in natural moisture, subjected to a load of up to 10T, showed a settlement of 1.19 mm, a settlement practically similar to the pile produced with waste, showing that the technique of using the waste is promising; when flooding the support ground of the pile in this load, the registered settlement was 14.67 mm, totaling a settlement of 15.86 mm when submitted to 10 T. The results showed that the measured settlements did not exceed the technical rupture criterion referenced by NBR 6122/19, which corresponds to 25 mm. The pioneering technique for the execution of pile piles on collapsible soils in the Cariri Region proved to be technically approved as a solution for foundations for small works. These results make it possible to conclude that the use of laminated limestone residue in the execution of pile piles on collapsible soils is technically and environmentally viable.

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