Banca de DEFESA: IGOR MACHADO DA SILVA PARENTE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : IGOR MACHADO DA SILVA PARENTE
DATA : 31/03/2020
HORA: 14:00
LOCAL: PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA CIVIL
TÍTULO:

EFFECT OF THE USE OF SISAL-CEMENT COMPOSITE IN PERMANENT FORMES ON THE DURABILITY OF ARMED CONCRETE BEAMS

PALAVRAS-CHAVES:

Durability. Permanent formwork. Composites. Sisal fibers. Reinforced concrete.

PÁGINAS: 125
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

The inadequate disposal and the non-reuse of the plywood sheets, after the execution of a work, have become a cause of environmental concern due to the amount of waste generated. This has encouraged the development of alternatives for the production of reinforced concrete structures, such as the use of permanent forms with prefabricated construction elements in reinforced mortar or in cementitious composites reinforced with short fibers. However, the material used in the permanent formwork, whose thickness was 20mm, aims to replace part of the concrete covering the reinforcement and, in this way, can affect the durability of reinforced concrete structures. In this work, the effect of cementitious composite materials reinforced with short sisal fibers, used in permanent form, on the durability of reinforced concrete structures was investigated. For this, cementitious composites reinforced with 2%, 4% and 6% fibers, in agglomerate mass, were produced with the same workability, in which: the fibers are 40mm long; the water-binder ratio was 0.40; the agglomerating-sand ratio (1:1); the binder was made up of 45% CP V ARI-RS type cement, 40% fly ash and 15% silica fume. The raw materials used in this research were characterized both physically and chemically. The composites that represent the permanent formwork were characterized in terms of determining the physical and mechanical properties. Regarding the durability techniques, accelerated carbonation and chloride ion migration were performed. The results show that the type of composite directly influences the entry of aggressive agents. After comparing the fiber content used, it was observed that the carbonated thickness increased as the fiber content was increased, which indicates a reduction in the life service of a reinforced concrete beam. Assessing the chloride migration, it was also noticed that the presence of fibers influenced the passage of harmful agents, which can compromise the structure to which the permanent form will replace the concrete cover thickness. Among the fiber contents used, it was found that the composite with 2% short sisal fibers performed better than the other materials. However, in estimating the design service life of this composite, it was analyzed that this material did not reach the established minimum limit of 50 years.

MEMBROS DA BANCA:
Interno - 2137887 - CLEBER MARCOS RIBEIRO DIAS
Interno - 1779028 - DANIEL VERAS RIBEIRO
Presidente - 549.925.915-15 - PAULO ROBERTO LOPES LIMA - UFRJ
Interno - 2178571 - RICARDO FERNANDES CARVALHO
Externo à Instituição - SAULO ROCHA FERREIRA