9 results on '"Vestena, Pablo Menezes"'
Search Results
2. Degree of Binder Activity on 100% Recycled Mixtures and Its Linear Viscoelasticity Behavior
- Author
-
Vestena, Pablo Menezes, Junior, Pedro Orlando Borges de Almeida, Specht, Luciano Pivoto, Bordin, Débora Tanise, Pinheiro, Helena Leitão, Vasconcelos, Kamilla L., Pires, Gustavo Menegusso, Di Benedetto, Hervé, editor, Baaj, Hassan, editor, Chailleux, Emmanuel, editor, Tebaldi, Gabriele, editor, Sauzéat, Cédric, editor, and Mangiafico, Salvatore, editor
- Published
- 2022
- Full Text
- View/download PDF
3. Dynamic modulus master curve construction of asphalt mixtures: Error analysis in different models and field scenarios
- Author
-
Vestena, Pablo Menezes, Schuster, Silvio Lisboa, Almeida Jr., Pedro Orlando Borges de, Faccin, Cléber, Specht, Luciano Pivoto, and Pereira, Deividi da Silva
- Published
- 2021
- Full Text
- View/download PDF
4. Degree of Binder Activity on 100% Recycled Mixtures and Its Linear Viscoelasticity Behavior
- Author
-
Vestena, Pablo Menezes, primary, Junior, Pedro Orlando Borges de Almeida, additional, Specht, Luciano Pivoto, additional, Bordin, Débora Tanise, additional, Pinheiro, Helena Leitão, additional, Vasconcelos, Kamilla L., additional, and Pires, Gustavo Menegusso, additional
- Published
- 2021
- Full Text
- View/download PDF
5. Rheological, permanent deformation and fatigue analysis for calibration of the recovery process of bitumens in the rotary evaporator.
- Author
-
Júnior, Pedro Orlando Borges de Almeida, Schuster, Silvio Lisboa, Faccin, Cléber, Vestena, Pablo Menezes, Ilha, Pedro Schmidt, Menegusso Pires, Gustavo, Müller, Edson Irineu, Pereira, Deividi da Silva, and Specht, Luciano Pivoto
- Subjects
BITUMEN ,PAVING industry ,BITUMINOUS pavements ,CONCRETE fatigue ,TRICHLOROETHYLENE - Abstract
The extraction and recovery of bitumens from bituminous mixtures is an important procedure in the paving industry. This work achieves to evaluate the rheological, permanent deformation and fatigue tests to calibration of the recovery procedure in the rotary evaporator. The protocol was divided in bitumens of known properties with laboratory aging and bitumens of unknown properties subjected to field aging. The materials were subjected to different distillation times and tested chemically, rheologically and for damage by fatigue and permanent deformation. The results indicated that the chemical FTIR test was not sensitive in capturing the presence of residual solvent in the bituminous materials due to low concentrations after recovery. The joint analysis of the |G*|, Jnr at 3.2 kPa of the MSCR and the Nf of the LAS test were consistent for determining the distillation times in the rotary evaporator to result in the absence of residual solvent and additional aging. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
6. Construction quality impact in asphalt pavements cost: a framework based on air voids, linear viscoelastic and fatigue behaviour.
- Author
-
Schuster, Silvio Lisboa, Borges de Almeida Júnior, Pedro Orlando, Faccin, Cléber, Bueno, Lucas Dotto, de Souza Chaves, Bruno, Vestena, Pablo Menezes, Specht, Luciano Pivoto, and da Silva Pereira, Deividi
- Subjects
MATERIAL fatigue ,FATIGUE life ,OPERATING costs ,DRILL core analysis ,ASPHALT ,RANDOM variables ,ASPHALT pavements - Abstract
The loss of performance against fatigue is evident for situations of poor execution of the surface layer, quantified in this research by the parameter in-field air voids. This loss of performance has a direct impact on highways operating costs. To analyse the loss of fatigue performance, eight field-applied asphalt mixes were evaluated, comparing laboratory compaction (5.50% air voids) with as-built in-field core samples (random variable air voids). The impact of increased air voids on LVE behaviour, fatigue life, and costs were investigated. Decrease in stiffness was observed for in-field air voids greater than 7.00%. Through the S-VECD model and FlexPAVE
TM software, a significant decrease in fatigue life was observed for in-field air voids greater than 8.00%. Costs, defined as costs per traffic request (N) (US$/N) were significantly affected for in-field air voids greater than this value (8.00%). Based on that, a Payment reduction factor (PRF) was proposed. In this way, it is concluded that the framework demonstrated throughout the paper, based on a mechanistic approach and using the FlexPAVETM , allows the evaluation of the construction quality impact on asphalt pavement cost. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
7. Evaluation of Moisture Susceptibility of Asphalt Mixtures: Influence of Aggregates, Visual Analysis, and Mechanical Tests
- Author
-
Brondani, Chaveli, primary, Faccin, Cléber, additional, Specht, Luciano Pivoto, additional, Nummer, Andrea Valli, additional, da Silva Pereira, Deividi, additional, Vestena, Pablo Menezes, additional, and Baroni, Magnos, additional
- Published
- 2023
- Full Text
- View/download PDF
8. IMPACT OF CLIMATE CHANGE ON ASPHALT BINDER SELECTION IN BRAZIL USING SUPERPAVE PERFORMANCE GRADING (PG)
- Author
-
Faccin, Cléber, primary, Ilha, Pedro Schmidt, additional, Do Nascimento, Luis Alberto Herrmann, additional, Schuster, Silvio Lisboa, additional, Júnior, Pedro Orlando Borges de Almeida, additional, Vestena, Pablo Menezes, additional, Bueno, Lucas Dotto, additional, Specht, Luciano Pivoto, additional, and Pereira, Deividi da Silva, additional
- Published
- 2022
- Full Text
- View/download PDF
9. Test sections at BR 116/RS using TLAFlex, HiMA and 55/75-E (SBS): advanced characterization and monitoring
- Author
-
Vestena, Pablo Menezes, Specht, Luciano Pivoto, Bueno, Lucas Dotto, Pereira, Deividi da Silva, and Mello, Luiz Guilherme Rodrigues de
- Subjects
Deformação permanente ,Fadiga ,Mechanistic-empirical methodology ,Método mecanístico-empírico ,Rutting ,Simulação de pavimentos ,Pavement simulation ,Asfalto modificado ,Modified binder ,Fatigue ,ENGENHARIAS::ENGENHARIA CIVIL [CNPQ] - Abstract
ANP/Petrobras Due to increase in heavy traffic, allied to department of transportation’s budgets restrictions, municipalities are seeking for long lasting pavements that perform better over time. Despite the increase in initial cost, modified binders proved to be an economically-viable alternative in long term evaluations. In this context, mechanistic-empirical methods emerge in several countries as a way to validate the high-quality materials use. Looking forward to evaluate the influence of modified binders on the asphalt materials behavior, three test sections were executed it BR 116/RS, using different asphalt mixtures in the surface layer: one containing Styrene-Butadiene-Styrene (SBS) polymer, AMP 55/75-E (PGH 64 V); one highly modified by SBS, Stylink HiMA (PGH 70 E); and another modified by Trinidad Lake Asphalt added to SBS, TLAFlex (PGH 70 H). The binder materials were characterized according to Superpave methodology, rheology, MSCR and LAS tests, suggesting a better rutting behavior for HiMA binder, and worst for AMP 55/75-E, and for fatigue, better for HiMA binder and worst for CAP 50-70 (used as asphalt base layer). The asphalt mixtures, collected during the pavement execution, were characterized with the tests of Resilient Modulus, Complex Modulus, Flow Number, Diametral Compression Fatigue and Uniaxial Cyclic Fatigue. Due to inconsistences in executed binder content, the correlation of the stiffness, rutting and fatigue between binder and mixture scales were not effective. In spite of that, all mixture had a great performance related to rutting. For fatigue, while the HIMA mixture (with Stylink HiMA) exhibited the best characteristics, the SBS (with AMP 55/75-E binder), with asphalt content 1,30% lower than dosed, had the worst. In parallel to this, since the opening to two years of opening to traffic, functional surveys of macro and microtexture, roughness, rutting and cracked area were conducted every semester in the highway. It was identified presence of water, mainly in SEG 01 (TLAF), which resulted in high levels of rutting. The evaluations using extracted reduced samples were promising, strengthening this methodology as a way to verify the field execution. Although the modified binders could not be directly compared due to divergences between laboratory controlled and field conditions, comparison between the segments was carried out separately. In this framework, the research conducted numerical simulations of the pavement structures using MeDiNa v.1.1.5.0 and LVECD Beta 1.1, with Nascimento (2015, 2021) transfer-functions, using retro-analysis before traffic opening, with wet subgrade material, and with the thickness obtained through field extractions. The rutting in the wet subgrade segment was assertively predicted by MeDiNa when using a material tested in the Wótima+4% condition. In relation to predicted cracked area for both programs simulations, it was concluded that among the retroanalyzed conditions, the LVECD, added with the updated transfer function, was the most assertive. Finally, when the triaxial conditions of the support layers were used in MeDiNa, it returned the prediction closest to the equality line. O aumento no volume de tráfego pesado, aliado a orçamentos mais restritos dos departamentos de infraestrutura, tem levado os gestores a buscarem pavimentos que melhor desempenhem ao longo do tempo. Apesar do aumento no custo inicial, o uso de ligantes modificados tem se provado como uma alternativa viável economicamente a longo prazo. Neste contexto, métodos mecanístico-empíricos surgem em diversos países, como forma de validar o uso de materiais de melhor qualidade. Buscando avaliar a influência dos ligantes modificados no comportamento dos materiais asfálticos, três segmentos experimentais foram executados na BR 116/RS, com diferentes misturas asfálticas na camada superficial: uma contendo polímero Styrene-Butadiene-Styrene (SBS), AMP 55/75-E (PGH 64 V); uma altamente modificada por SBS, Stylink HiMA (PGH 70 E); e outra modificada por Trinidad Lake Asphalt com adição de SBS, TLAFlex (PGH 70 H). Os ligantes foram caracterizados quanto à metodologia Superpave, LVE, MSCR e LAS, indicando um melhor comportamento à deformação permanente para o HiMA, e pior para AMP 55/75-E; e na fadiga, melhor para o ligante HiMA, e pior para CAP 50-70 (utilizado como camada de binder). As misturas asfálticas, coletadas durante a execução, foram caracterizadas quanto ao Módulo de Resiliência, Módulo Complexo, Flow Number, Fadiga à compressão diametral e à tração-compressão. Devido a incoerências no teor de ligante das misturas executadas, as correlações entre os resultados de rigidez, deformação permanente e fadiga para as duas escalas (ligantes e misturas) não foram efetivas. Apesar disso, todas misturas obtiveram um ótimo desempenho à deformação permanente. Para a fadiga, enquanto a mistura HIMA (com ligante Stylink HiMA) foi a que exibiu melhores características, a SBS (ligante AMP 55/75-E), com teor de asfalto 1,30% inferior ao dosado, as piores. Em paralelo a isso, levantamentos funcionais de macro e microtextura, irregularidade longitudinal, afundamento em trilha de roda, e área trincada foram conduzidos semestralmente na rodovia, desde a implantação até dois anos de abertura ao tráfego. Foi verificada presença de umidade nas camadas de subleito, principalmente no SEG 01 (TLAF), que ocasionou elevados níveis de afundamento. As avaliações utilizando amostras reduzidas extraídas de pista foram promissoras, fortalecendo essa metodologia como forma de verificação da execução de campo. Ainda que os ligantes asfálticos modificados não puderam ser diretamente comparados devido às diferenças entre condições controladas em laboratório e executadas em campo, a comparação entre os segmentos se deu separadamente. Nesse enquadramento, simulações computacionais das estruturas e características do trecho foram realizadas, utilizando os programas MeDiNa v. 1.1.5.0 e LVECD Beta 1.1, com as funções de transferência de Nascimento (2015, 2021), nas condições de retroanálise antes da abertura ao tráfego, com o material de subleito úmido e com as espessuras obtidas por extrações de campo. O afundamento em trilha de roda do segmento com umidade foi assertivamente previsto pelo programa MeDiNa ao utilizar um material de subleito ensaiado na condição Wótima+4%. Em relação à área trincada prevista por ambos programas, concluiu-se que dentre as condições retroanalisadas, o LVECD aliado a função de transferência atualizada, foi o mais assertivo. Por fim, quando utilizadas as condições triaxiais das camadas de suporte no MeDiNa, retornou-se a previsão mais próxima da linha de igualdade previsto versus observado.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.