Rational Modeling of Tertiary Flow for Asphalt Mixtures

Biligiri, Krishna Prapoorna; Kaloush, Kamil; Mamlouk, Michael; Witczak, M W

doi:10.3141/2001-08

Cited by 103 publications

(46 citation statements)

References 5 publications

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“…With the modified wheel tracker test set up, all three zones of deformation were captured for both vertical and horizontal deformations. The equivalent flow number from the modified wheel tracker test was calculated using the Francken model as shown in Table 2 (Biligiri, 2007). Data shown in Table 2 Table 2 Figure 6 As can be seen from the above analysis presented in Figures 5a to 5h and the data in Table 2 2 above, the semi unconfined wheel tracker test setup provided wealth of information to characterize the permanent deformation behavior.…”

Section: Sensitivity To the MIX Volumetric Properties And Test Tempermentioning

confidence: 99%

Modified wheel tracker as a potential replacement for the current conventional wheel trackers

Saleh

2018

International Journal of Pavement Engineering

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This research introduces a modified method for the wheel tracker test. Conventionally, the test is conducted by placing asphalt slabs or cylindrical cores in a fully confined steel or polyethylene molds. The research work undertaken by the author has shown that having the specimen fully confined in all directions by the steel or polyethylene mold would limit or prevent it from lateral (shear) deformation. It is also well-known that shear related permanent deformation is identified as the primary cause for high severity rutting. As a result, a new wheel tracker test setup was designed and manufactured to capture the true material response under the applied load. In the conventional wheel tracker, the large majority of samples will only show the primary stage and very small part of the secondary stage of the permanent deformation curve and most of the time the curve will plateau regardless of the number of cycles applied. Therefore, in the conventional wheel tracker test, the tertiary stage never reached in the vast majority of the tested specimens. In the modified wheel tracker, the three stages of permanent deformations are always captured, therefore, the flow number can be determined. In addition, the effect of the major mix parameters and test conditions such as air voids content, aggregate gradation, binder type and test temperature can be captured and analyzed.

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Section: Sensitivity To the MIX Volumetric Properties And Test Tempermentioning

confidence: 99%

Modified wheel tracker as a potential replacement for the current conventional wheel trackers

Saleh

2018

International Journal of Pavement Engineering

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“…Regiões da curva de deformação plástica e obtenção do FN (ABNT 16505, 2016) Para a determinaça o da deformaça o permanente especí fica, e proposto na literatura o modelo de Francken (Equaça o 1), que combina modelos de pote ncia e exponencial. Este modelo e aplica vel a misturas asfa lticas com ligante na o modificado ou modificado, ajustando-se bem a s curvas de deformaça o permanente das misturas que atingiram ou na o a zona tercia ria (Biligiri et al, 2007;Dongre et al, 2009;Von Quintus et al, 2012).…”

Section: Deformação Permanente Em Misturas Asfálticasunclassified

Critérios para os resultados do ensaio uniaxial de carga repetida de misturas asfálticas em laboratório a partir do desempenho em campo

2017

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RESUMOA busca por critérios que auxiliem na seleção de misturas asfálticas em laboratório que resistam à deformação permanente em campo motivou o desenvolvimento desta pesquisa. A partir dessa motivação, o objetivo foi avaliar a relação entre os dados experimentais disponíveis no Brasil de deformação permanente em laboratório (uniaxial de carga repetida) com aqueles encontrados em campo [Afundamento em Trilha de Roda (ATR)], com vistas ao refinamento de critérios para os resultados do ensaio laboratorial em função do tráfego. A partir da organização do banco de dados de 12 trechos experimentais monitorados, utilizou-se o método estatístico dos clusters para indicar 4 categorias de Flow Number (FN). Considerou-se que FNs inferiores a 100 resistem apenas a um tráfego leve; FNs acima de 100 são indicados para um tráfego médio; superior a 300 para um tráfego pesado; e acima de 1000 para um tráfego extremamente pesado. Destaca-se ainda a relevância da continuidade do monitoramento de pistas experimentais no Brasil. Desta forma, as informações possibilitarão a verificação contínua e o refinamento dos critérios propostos nesta pesquisa. ABSTRACTThe selection of asphalt mixtures that resist to permanent deformation in the field has encouraged the development of the present research. The main goal is to evaluate the relationship between asphalt mixtures' rutting resistance obtained in the laboratory (uniaxial repeated load test) with field observations (rutting), seeking the refinement of criteria for the laboratory test results as a function of field traffic. A database of 12 monitored test sections in Brazil was organized and the cluster statistical method was used to indicate 4 Flow Number (FN) categories. It was considered that FNs under 100 resists only light traffic; FNs above 100 are indicated for medium traffic; more than 300 for heavy traffic; and above 1,000 for extremely heavy traffic. It is highlighted the importance of monitoring test sections in Brazil, which will lead to a continuous verification and refinement of the criteria proposed in this research. Palavras-chaves:Deformação permanente. Trechos monitorados. Uniaxial de carga repetida.

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“…Also if one uses deviatoric stresses less than 200 kPa for modified bituminous mixtures, one cannot map the tertiary creep and hence it is required to conduct the tests at deviatoric stress levels of 500 kPa [6]. Many researchers (Bhasin et al [7]; Archilla et al [8]; Biligiri et al [9]; Zhang and Pie [10]; Modhaddam et at. [11]) have performed flow number experiments on bituminous mixtures with haversine loading of 0.1 s loading period continued by a rest period of 0.9 s. Hajj et al [12] simulated the stress in the pavement due to traffic loading for determination of loading time duration and magnitude of deviatoric loading for creep and recovery test.…”

Section: Introductionmentioning

confidence: 99%

Influence of Confinement Pressure on the Development of Three Stage Curve for Bituminous Mixtures

Gayathri

Rajasekar

Roja

et al. 2016

Transp. in Dev. Econ.

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As part of the mechanistic-empirical pavement design procedure, the flow number test is used to rank the bituminous mixtures for rutting. In the flow number test, a sample is subjected to 0.1 s of loading followed by 0.9 s rest period and a haversine load waveform is used. This test protocol has serious limitation and these are due to the loading conditions applied and the post-processing procedure followed for flow number determination. In this investigation, three changes were made in the existing flow number protocol. The first one was in the load waveform. A trapezoidal waveform was used instead of the haversine load waveform. The second change was related to loading conditions. Different combinations of confinement and deviatoric loading were applied and the final choice was made based on the resulting three stage creep curve. The third change was related to post-processing method and a Francken model to capture the complete three stages of deformation was used. A BC mix with mid-gradation following MoRTH (Specifications for roads and bridge works. Indian Roads Congress, New Delhi 2013) guidelines was used with VG30 and CRMB60 binder. PReSBOX shear compactor was used for making cylindrical samples of 94 mm diameter and 150 mm height. The samples were cast with a target air voids of 6 %. All the testing was carried out at 50 and 60°C. Different confinement conditions ranging from 50 to 200 kPa were used with the deviatoric loading ranging from 200 to 600 kPa. The influence of modified binder was clearly seen in the development of three stage curve. The collected data was post-processed using Francken model and the flow number was determined. This flow number was bench marked with the existing flow number protocol and it was seen that there were gross discrepancies. Keywords Flow number Á Three stage creep curve Á Confinement pressure Á Viscoelasticity Á Rutting Á Francken model Transp. in Dev. Econ. (2016) 2:10

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Rational Modeling of Tertiary Flow for Asphalt Mixtures

Cited by 103 publications

References 5 publications

Modified wheel tracker as a potential replacement for the current conventional wheel trackers

Modified wheel tracker as a potential replacement for the current conventional wheel trackers

Critérios para os resultados do ensaio uniaxial de carga repetida de misturas asfálticas em laboratório a partir do desempenho em campo

Influence of Confinement Pressure on the Development of Three Stage Curve for Bituminous Mixtures

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