Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Clever Aparecido Valentin"'
Autor:
Fernando Luiz Lavoie, Marcelo Kobelnik, Clever Aparecido Valentin, Érica Fernanda da Silva Tirelli, Maria de Lurdes Lopes, Jefferson Lins da Silva
Publikováno v:
Química Nova, Vol 48, Iss 2 (2024)
High-density polyethylene (HDPE) geomembranes are commonly used as an environmental protection liner due to their good chemical and mechanical resistances and low cost. Ultraviolet (UV) radiation is an essential issue in durability studies for pond a
Externí odkaz:
https://doaj.org/article/77da88ef2a3e42d9a46e0027822d78f1
Autor:
Fernando Luiz Lavoie, Marcelo Kobelnik, Clever Aparecido Valentin, Maria de Lurdes Lopes, Jefferson Lins da Silva, Ennio Marques Palmeira
Publikováno v:
Results in Materials, Vol 22, Iss , Pp 100552- (2024)
This study analyzed the behavior of three HDPE smooth geomembrane samples of 1.0, 1.5, and 2.0 mm thicknesses under heat exposure for 8760 h and the combined effect of UV radiation for 8760 h followed by heat aging for 4380 h. The results show high a
Externí odkaz:
https://doaj.org/article/2722e80cb807413e98d671135a6a5988
Autor:
Fernando Luiz Lavoie, Marcelo Kobelnik, Clever Aparecido Valentin, Maria de Lurdes Lopes, Ennio Marques Palmeira, Jefferson Lins da Silva
Publikováno v:
Case Studies in Construction Materials, Vol 18, Iss , Pp e02212- (2023)
This study evaluated nine exhumed high-density polyethylene (HDPE) geomembranes from different Brazilian civil construction facilities under several exposure times, from two to fifteen years in service. Physical and thermal analyses were performed to
Externí odkaz:
https://doaj.org/article/334bacf03cc8431a9d693586e4132e1f
Autor:
Jefferson Lins da Silva, Clever Aparecido Valentin, Marcelo Kobelnik, Gabriel Orquizas Mattielo Pedroso, Maria Alejandra Aparício-Ardila, Luiz Paulo Vieira de Araújo Júnior, Marta Pereira da Luz
Publikováno v:
Materials, Vol 16, Iss 11, p 4148 (2023)
A Hydroelectric Power Plant (HPP) presents erosion problems on reservoir slopes and margins. Geomats are a biotechnical composite technology increasingly used to protect soils against erosion. Survivability or durability of geomats is essential for s
Externí odkaz:
https://doaj.org/article/999a365549154c6ba4051c97d9ec145f
Autor:
Fernando Luiz Lavoie, Marcelo Kobelnik, Clever Aparecido Valentin, Érica Fernanda da Silva Tirelli, Maria de Lurdes Lopes, Jefferson Lins da Silva
Publikováno v:
Case Studies in Construction Materials, Vol 16, Iss , Pp e00809- (2022)
The present work evaluated three high-density polyethylene (HDPE) geomembranes exhumed from two shrimp farming ponds in the northeast of Brazil with nominal thicknesses of 0.8 mm. The CAM sample was exhumed from the bottom liner, and the CAM1 sample
Externí odkaz:
https://doaj.org/article/326a52567c104a39acd618abd966225f
Autor:
Leonardo Antonio Valentin, Clever Aparecido Valentin, Marcelo Kobelnik, Jefferson Lins da Silva
Publikováno v:
Case Studies in Chemical and Environmental Engineering, Vol 5, Iss , Pp 100174- (2022)
Geomembrane is a type of material used in civil engineering and environmental engineering works for the protection and recovery of the environment. Five geomembranes commercially obtained from three Brazilian companies were chemically characterized.
Externí odkaz:
https://doaj.org/article/5a3aa0ae10bd400699dd603b87251802
Publikováno v:
Química Nova, Vol 43, Iss 5, Pp 656-667 (2020)
The polymer demand for geotechnical applications has been growing. The geomembrane is a geosynthetic, manufactured, polymeric product and is often specified in environmental projects. Geomembranes started to be used in the 1930s but became more wides
Externí odkaz:
https://doaj.org/article/26f75864d0c846fba53c84130ece4301
Autor:
Fernando Luiz Lavoie, Marcelo Kobelnik, Clever Aparecido Valentin, Érica Fernanda da Silva Tirelli, Maria de Lurdes Lopes, Jefferson Lins da Silva
Publikováno v:
Case Studies in Chemical and Environmental Engineering, Vol 4, Iss , Pp 100133- (2021)
High-density polyethylene (HDPE) geomembranes are often used as a liner in different applications, such as hazardous waste landfills, mining, water conservation, and waste ponds. The service exposure of materials causes thermal and oxidative degradat
Externí odkaz:
https://doaj.org/article/829d4aea97064b739caf3f704e6be421
Autor:
Yara Barbosa Franco, Clever Aparecido Valentin, Marcelo Kobelnik, Jefferson Lins da Silva, Clovis Augusto Ribeiro, Marta Pereira da Luz
Publikováno v:
Materials, Vol 15, Iss 12, p 4157 (2022)
Nonwoven geotextiles are geosynthetic products that are highly susceptible to ultraviolet degradation because light can reach a large area of the material due to its fiber arrangement. Even with additives, which delay the degradation process, materia
Externí odkaz:
https://doaj.org/article/3d5e4e94433742b38bef65a0fd17cf0e
Autor:
Fernando Luiz Lavoie, Marcelo Kobelnik, Clever Aparecido Valentin, Jefferson Lins da Silva, Maria de Lurdes Lopes
Publikováno v:
Results in Materials, Vol 8, Iss , Pp 100131- (2020)
This paper analyzed the behavior of an HDPE geomembrane exhumed sample used for 2.25 years as a liner in an industrial water pond from a Brazilian company, as well as another similar sample as a reference. The thermogravimetry (TG) using different he
Externí odkaz:
https://doaj.org/article/ab581881c8574ca484ebd13ea5189c05