Mechanical behavior of cold recycled asphalt mixtures.
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | https://www.teses.usp.br/teses/disponiveis/3/3138/tde-23072021-151646/ |
Resumo: | The Brazilian reduced paved road density, the increasingly demand for highways, and the lack of investment in preventive maintenance practices accelerate the occurrence of pavement distresses. This imparts for poor riding quality highways, resulting in higher fuel consumption, greater emission of pollutant gases, and increasing operational costs. In this scenario, cold recycling practices may be a cost-effective and environmental friendly alternative for pavement rehabilitation. The cold recycled asphalt mixtures (CRAMs) produced by cold recycling techniques, are comprised by reclaimed asphalt pavement (RAP), bitumen stabilized agents (asphalt emulsion or foamed asphalt), and active fillers (cement or hydrated lime). Despite the economical and sustainable benefits, the CRAMs exhibit a complex mechanical behavior since numerous variables can influence its stiffness. Therefore, the purpose of this study is to evaluate the CRAM\' stiffness dependency regarding temperature, load frequency, stress-state and moisture content variation. Four types of CRAMs were collected from the field during experimental test section construction and were evaluated by means of laboratory tests. For temperature evaluation, the CRAMs linear viscoelastic properties were investigated by means of dynamic modulus and the results were used as input data for computational simulation. It was observed that the CRAMs viscoelastic properties influence the pavement mechanical response. For moisture evaluation, triaxial resilient modulus tests were conducted at different curing conditions. In conjunction with the filter paper test and X-ray micro computed tomography, a correspondence was observed between matric suction and resilient modulus. Besides, the CRAMs stress-state dependency was evaluated by means of pavement simulation and compared with in situ measurements. It was observed that the non-linear elastic behavior of CRAMs substantially influences the pavement mechanical behavior. |
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Mechanical behavior of cold recycled asphalt mixtures.Comportamento mecânico de misturas asfálticas recicladas a frio.Cold recycled asphalt mixturesElasticidadeElasticidade não-linearMatric suctionMistura reciclada a frioNon-linear elasticityPavimentação asfálticaPavimentos rígidosRigidezStiffnessSucção mátricaViscoelasticidadeViscoelasticityThe Brazilian reduced paved road density, the increasingly demand for highways, and the lack of investment in preventive maintenance practices accelerate the occurrence of pavement distresses. This imparts for poor riding quality highways, resulting in higher fuel consumption, greater emission of pollutant gases, and increasing operational costs. In this scenario, cold recycling practices may be a cost-effective and environmental friendly alternative for pavement rehabilitation. The cold recycled asphalt mixtures (CRAMs) produced by cold recycling techniques, are comprised by reclaimed asphalt pavement (RAP), bitumen stabilized agents (asphalt emulsion or foamed asphalt), and active fillers (cement or hydrated lime). Despite the economical and sustainable benefits, the CRAMs exhibit a complex mechanical behavior since numerous variables can influence its stiffness. Therefore, the purpose of this study is to evaluate the CRAM\' stiffness dependency regarding temperature, load frequency, stress-state and moisture content variation. Four types of CRAMs were collected from the field during experimental test section construction and were evaluated by means of laboratory tests. For temperature evaluation, the CRAMs linear viscoelastic properties were investigated by means of dynamic modulus and the results were used as input data for computational simulation. It was observed that the CRAMs viscoelastic properties influence the pavement mechanical response. For moisture evaluation, triaxial resilient modulus tests were conducted at different curing conditions. In conjunction with the filter paper test and X-ray micro computed tomography, a correspondence was observed between matric suction and resilient modulus. Besides, the CRAMs stress-state dependency was evaluated by means of pavement simulation and compared with in situ measurements. It was observed that the non-linear elastic behavior of CRAMs substantially influences the pavement mechanical behavior.A baixa proporção de vias pavimentadas no Brasil, a alta demanda pelo transporte rodoviário e a falta de investimentos em manutenções preventivas aceleram o surgimento de patologias no pavimento. Tais patologias comprometem a qualidade das rodovias, aumentando o consumo de combustível, a emissão de gases poluentes e os custos operacionais. Logo, as técnicas de reciclagem a frio podem ser vistas como uma alternativa vantajosa em termos de sustentabilidade e custo-benefício para a reabilitação de pavimentos. As misturas recicladas a frio (CRAMs, do inglês cold recycled asphalt mixtures), são compostas por material fresado (RAP, do inglês reclaimed asphalt pavement) estabilizado com emulsão asfáltica ou espuma de asfalto e fíler ativo (cimento ou cal hidratada). Apesar das vantagens econômicas e ambientais das CRAM, seu comportamento mecânico é complexo, pois diversas variáveis afetam sua rigidez. O objetivo deste estudo é avaliar a influência da temperatura, da frequência de carregamento, do estado de tensão e da umidade na rigidez das CRAMs. Quatro tipos de CRAMs foram coletados do campo durante a construção de um trecho experimental e ensaiadas em laboratório. Para análise do efeito da temperatura, o ensaio de módulo dinâmico foi realizado para obtenção das propriedades viscoelásticas das CRAMs e os resultados obtidos foram utilizados como dados de entrada para simulação computacional. Observou-se que a comportamento viscoelástico das CRAMs influencia a resposta mecânica do pavimento. Para avaliar o efeito da umidade e do estado de tensão, o ensaio de módulo de resiliência triaxial foi realizado em diferentes condições de cura. Juntamente com os ensaios de papel filtro e microtomografia por raio X observou-se que a sucção mátrica está relacionadacom o módulo de resiliência desses materiais. Além disso, o efeito da dependência do estado de tensão das CRAMs foi avaliado por meio de simulação computacional e comparadas com medições in situ. Constatou-se que a elasticidade não-linear influencia significativamente o comportamento mecânico do pavimento.Biblioteca Digitais de Teses e Dissertações da USPSavasini, Kamilla VasconcelosKuchiishi, André Kazuo2019-04-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttps://www.teses.usp.br/teses/disponiveis/3/3138/tde-23072021-151646/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2021-07-23T21:45:02Zoai:teses.usp.br:tde-23072021-151646Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212021-07-23T21:45:02Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Mechanical behavior of cold recycled asphalt mixtures. Comportamento mecânico de misturas asfálticas recicladas a frio. |
title |
Mechanical behavior of cold recycled asphalt mixtures. |
spellingShingle |
Mechanical behavior of cold recycled asphalt mixtures. Kuchiishi, André Kazuo Cold recycled asphalt mixtures Elasticidade Elasticidade não-linear Matric suction Mistura reciclada a frio Non-linear elasticity Pavimentação asfáltica Pavimentos rígidos Rigidez Stiffness Sucção mátrica Viscoelasticidade Viscoelasticity |
title_short |
Mechanical behavior of cold recycled asphalt mixtures. |
title_full |
Mechanical behavior of cold recycled asphalt mixtures. |
title_fullStr |
Mechanical behavior of cold recycled asphalt mixtures. |
title_full_unstemmed |
Mechanical behavior of cold recycled asphalt mixtures. |
title_sort |
Mechanical behavior of cold recycled asphalt mixtures. |
author |
Kuchiishi, André Kazuo |
author_facet |
Kuchiishi, André Kazuo |
author_role |
author |
dc.contributor.none.fl_str_mv |
Savasini, Kamilla Vasconcelos |
dc.contributor.author.fl_str_mv |
Kuchiishi, André Kazuo |
dc.subject.por.fl_str_mv |
Cold recycled asphalt mixtures Elasticidade Elasticidade não-linear Matric suction Mistura reciclada a frio Non-linear elasticity Pavimentação asfáltica Pavimentos rígidos Rigidez Stiffness Sucção mátrica Viscoelasticidade Viscoelasticity |
topic |
Cold recycled asphalt mixtures Elasticidade Elasticidade não-linear Matric suction Mistura reciclada a frio Non-linear elasticity Pavimentação asfáltica Pavimentos rígidos Rigidez Stiffness Sucção mátrica Viscoelasticidade Viscoelasticity |
description |
The Brazilian reduced paved road density, the increasingly demand for highways, and the lack of investment in preventive maintenance practices accelerate the occurrence of pavement distresses. This imparts for poor riding quality highways, resulting in higher fuel consumption, greater emission of pollutant gases, and increasing operational costs. In this scenario, cold recycling practices may be a cost-effective and environmental friendly alternative for pavement rehabilitation. The cold recycled asphalt mixtures (CRAMs) produced by cold recycling techniques, are comprised by reclaimed asphalt pavement (RAP), bitumen stabilized agents (asphalt emulsion or foamed asphalt), and active fillers (cement or hydrated lime). Despite the economical and sustainable benefits, the CRAMs exhibit a complex mechanical behavior since numerous variables can influence its stiffness. Therefore, the purpose of this study is to evaluate the CRAM\' stiffness dependency regarding temperature, load frequency, stress-state and moisture content variation. Four types of CRAMs were collected from the field during experimental test section construction and were evaluated by means of laboratory tests. For temperature evaluation, the CRAMs linear viscoelastic properties were investigated by means of dynamic modulus and the results were used as input data for computational simulation. It was observed that the CRAMs viscoelastic properties influence the pavement mechanical response. For moisture evaluation, triaxial resilient modulus tests were conducted at different curing conditions. In conjunction with the filter paper test and X-ray micro computed tomography, a correspondence was observed between matric suction and resilient modulus. Besides, the CRAMs stress-state dependency was evaluated by means of pavement simulation and compared with in situ measurements. It was observed that the non-linear elastic behavior of CRAMs substantially influences the pavement mechanical behavior. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-04-05 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.teses.usp.br/teses/disponiveis/3/3138/tde-23072021-151646/ |
url |
https://www.teses.usp.br/teses/disponiveis/3/3138/tde-23072021-151646/ |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
|
dc.rights.driver.fl_str_mv |
Liberar o conteúdo para acesso público. info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Liberar o conteúdo para acesso público. |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.coverage.none.fl_str_mv |
|
dc.publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
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