Effect of compaction conditions on aggregate packing using 2-dimensional image analysis and the relation to performance of HMA

Sefidmazgi, Nima Roohi; Bahia, Hussain U.

doi:10.1617/s11527-014-0275-x

Cited by 47 publications

(13 citation statements)

References 7 publications

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“…These include asphalt [22,23], soil [20], fibre reinforced concrete [24,25] and fibre board [26,27]. Image analysis has also been applied to investigate the size distribution of bio-aggregate particles [21] and was used as an additional reference.…”

Section: Image Analysismentioning

confidence: 99%

“…To identify the shiv within the images, two image filters with successful precedents for other materials [23,28,29] were applied: a median filter and a threshold filter. The same processes were implemented for both two dimensional and three dimensional images, however differing programs and settings were used due to the differing image formats.…”

Section: Segregationmentioning

confidence: 99%

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A method for the assessment of the internal structure of bio-aggregate concretes

Williams

Lawrence

Walker

2016

Construction and Building Materials

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Section: Image Analysismentioning

confidence: 99%

Section: Segregationmentioning

confidence: 99%

A method for the assessment of the internal structure of bio-aggregate concretes

Williams

Lawrence

Walker

2016

Construction and Building Materials

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“…At present, there are no unified mesoscopic indices to evaluate the meso-structure of asphalt mixtures. Previous researches have demonstrated that the number of aggregate-to-aggregate proximity zones, total proximity zone length and proximity zone plane orientation [22], the number of contact points and the orientation of coarse aggregates [14,16], as well as the contact force at the contact points [23,24], as the indies to evaluate the stress characteristics of the main skeleton. In this study, the DIP is used to evaluate the interlocked characteristics of the main skeleton; moreover, appropriate mesoscopic evaluation indices, including the coordination number, average coordination number, and C value are proposed.…”

Section: Mesoscopic Evaluation Indices For the Main Skeletonmentioning

confidence: 99%

Gradual Meso-Structural Response Behaviour of Characteristics of Asphalt Mixture Main Skeleton Subjected to Load

et al. 2019

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In order to provide a reference for the gradation design of dense skeleton asphalt mixtures (DSAM), this study conducts a thorough analysis of the gradual meso-structural response behaviour of characteristics of the asphalt mixture main skeleton subjected to load using the digital image processing (DIP) technique. Moreover, gradation optimisation measures and the design criteria of mesoscopic evaluation indices for the main skeleton are proposed. The results indicate that aggregates with particle sizes of 2.36–4.75 mm can effectively increase the number of contact points; however, the stability of the main skeleton remains insufficient. Furthermore, coarse aggregates with a particle size larger than 4.75 mm provide the most significant contribution to the formation of a steady main skeleton; this is the critical particle size for the formation of a steadier main skeleton. Gradation is the major determinant of mesoscopic evaluation indices, including average coordination number ( n ¯ c ) and the ratio of the quantity of coarse aggregates without contact points to the total quantity of coarse aggregates (C value) for the asphalt mixture of the main skeleton. On the other hand, the performance of asphalt has an insignificant influence on mesoscopic evaluation indices; it mainly affects the development trend of macroscopic rutting. In the design process of DSAM, it is necessary to optimise gradation with the aim of increasing n ¯ c and reducing the C value so as to enhance the load resistance capacity of the primary skeleton. When preparing asphalt mixture specimens using the wheel rolling method, the design criteria for the aforementioned indices are n ¯ c ≥ 1.5 and C ≤ 15%, which can be used as bases for the design of DSAM with a nominal maximum particle size of 13.2 mm to ensure that the coarse aggregates are interlocked and form a steady main skeleton.

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“…A estrutura do pavimento e o projeto de dosagem do revestimento visam garantir que todos os requisitos técnicos de qualidade sejam atendidos, sendo que a escolha dos materiais e a dosagem influenciam no comportamento mecânico do revestimento durante a ação do tráfego e do clima. SEFIDMAZGI e BAHIA [2] mostraram em seu estudo que cada mistura asfáltica possui uma estrutura característica, sendo que esta pode variar de acordo com o tipo de agregado, ligante asfáltico, temperatura e grau de compactação. A estrutura interna do concreto asfáltico determina o suporte à deformação permanente, bem como o comportamento quanto à fadiga e à variação térmica.…”

Section: Introductionunclassified

Estudo do Concreto Asfáltico Estocável

et al. 2020

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RESUMO Misturas asfálticas são os principais tipos de materiais que compõem as camadas de revestimentos asfálticos dos pavimentos brasileiros. Sabendo disso, este estudo teve por objetivo estudar misturas asfálticas, conhecidas como Concreto Asfáltico Estocável (CAE), que tem como diferencial a proposta de poder ser armazenada a granel ou ensacada e aplicada à frio. Foram realizadas as caracterizações físicas, volumétricas e mecânicas de três amostras de CAE de diferentes fabricantes com vistas a compreender sua composição e comportamento mecânico. Além disso, foram realizadas avaliações da granulometria utilizando as metodologias Bailey e Frações de Agregados Dominantes (FAD). Os resultados mostraram que as misturas de CAE não atenderam aos requisitos especificados em normas brasileiras e apresentaram resultados diferentes do esperado para um concreto asfáltico convencional, indicando que o mesmo não deve ser abordado como tal. Além disso, o CAE não atendeu aos parâmetros de trabalhabilidade e volumetria. Os resultados de viscosidade do ligante, do módulo dinâmico e do Flow Number indicaram que uma das amostras apresenta alta rigidez, fato que pode estar relacionado ao envelhecimento do ligante asfáltico e consequente enrijecimento da mistura. Por fim, verificou-se que o CAE apresenta envelhecimento durante a estocagem, o que não é adequado para misturas asfálticas. Logo, conclui-se que o mesmo, sem a adoção de critérios de controle de produção e aplicação, não é adequado para utilização como nova camada de revestimento, tendo seu uso limitado à serviços de manutenção como tapa-buraco.

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Effect of compaction conditions on aggregate packing using 2-dimensional image analysis and the relation to performance of HMA

Cited by 47 publications

References 7 publications

A method for the assessment of the internal structure of bio-aggregate concretes

A method for the assessment of the internal structure of bio-aggregate concretes

Gradual Meso-Structural Response Behaviour of Characteristics of Asphalt Mixture Main Skeleton Subjected to Load

Estudo do Concreto Asfáltico Estocável

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