Banca de DEFESA: MICHELINE DOS ANJOS E MELLO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MICHELINE DOS ANJOS E MELLO
DATE: 29/08/2022
TIME: 08:00
LOCAL: Local a definir
TITLE:

Thermal degradation of geosynthetics used in flexible pavements with hot mix asphalt

KEY WORDS:

Geosynthetics. Anti-reflective cracking systems. Asphalt concrete. Thermal damage. Mechanical damage.

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SPECIALTY: Pavimentos
SUMMARY:

The road transport is responsible for a large part of the transport of cargo and people in Brazil, therefore, keeping pavements in good condition implies benefits for the economy and for users, however, it is common for flexible pavement to crack throughout its lifetime. Usually, a new bituminous layer is adopted to repair cracked pavements, but in a short time the cracks are reflected or propagated from the old layer to the new one. A solution adopted to reduce and delay the reflection cracking is the use of geosynthetics, however, these materials can be thermally and mechanically damaged during the installation process. In this way, it is important to verify if these damages are considerable and if they hinder the materials from fulfilling the function for which they were designed. Thus, this research aims to analyze the thermal and mechanical degradation suffered by geosynthetics used as anti-reflective cracking systems and, additionally, to verify if there is an improvement in this analysis with the use of aluminum foil. For this, four types of geocomposites were used and their samples were classified into: virgin samples, which were not subjected to damage; samples with thermal damage, on which the asphalt concrete with high working temperature was deposited and uniformed; samples with thermal and mechanical damage, which, in addition to being subjected to the effect of high temperature, were also exposed to mechanical action due to asphalt concrete compaction. All the damaged samples were
divided symmetrically and in one part aluminum foil was placed before exposure to the damage and in the other part the asphalt mixture was placed directly, therefore, the damaged samples were categorized as with and without aluminum foil. Afterwards, the samples were cut to be tested according to ASTM D6637 (2015). The results of the tensile tests provided parameters such as tensile strength, grip displacement and slope of the lines. Such parameters were analyzed and used as degradation indicators. It was possible to conclude that the
severity of damage depends on the raw material of the geosynthetic, as well as the damage type to which it was subjected.

COMMITTEE MEMBERS:
Presidente - 2085750 - FAGNER ALEXANDRE NUNES DE FRANCA
Interno - ***.307.994-** - ENIO FERNANDES AMORIM - IFRN
Externo à Instituição - FERNANDO HENRIQUE MARTINS PORTELINHA - UFSCAR