Calibration of Rutting Models for Structural and Mix Design

Quintus, Harold L Von; Mallela, Jagannath; Bonaquist, Ramon; Schwartz, Charles W.; Carvalho, Regis

doi:10.17226/22781

Cited by 58 publications

(43 citation statements)

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“…All RLPD testing in this study was conducted at 398C, 69 kPa confining pressure and 483 kPa repeated deviator stress following the NCHRP 9-30A recommendations for HMA (Von Quintus et al 2011).…”

Section: Test Methodsmentioning

confidence: 99%

“…At 398C and the same loading conditions (69 kPa confining pressure and 483 kPa deviatoric stress) the typical range of permanent deformation at 10,000 cycles for HMA is in the range of 0.7% -2% strain (Von Quintus et al 2011) while it was 0.4% and 0.8% on average for the F and M cores, respectively. The average permanent strain of the HMA cores tested in this study was 1.1% strain higher than FASB cores.…”

Section: Repeated Load Permanent Deformationmentioning

confidence: 98%

“…A realistic characterisation methodology is triaxial testing of field-cured specimens at stress states and temperatures representative of field condition. Therefore, this study employs triaxial RLPD testing of field core specimens at field stress levels and the critical temperature condition as recommended by NCHRP Project 9-30A for HMA (Von Quintus et al 2011).…”

Section: Permanent Deformationmentioning

confidence: 99%

“…The average permanent strain of the HMA cores tested in this study was 1.1% strain higher than FASB cores. Moreover, testing the rut susceptibility of FASB under 69 kPa confining pressure and 483 kPa deviatoric stress recommendations for HMA (Von Quintus et al 2011) should overstate the permanent deformations in FASB for thick pavements, as the FASB is lower in the pavement structure and thus experiences lower stresses in the field than the HMA layers. Given all of this, rutting is not expected to be a concern for the FASB mixture evaluated in this study.…”

Section: Repeated Load Permanent Deformationmentioning

confidence: 99%

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Mechanistic structural properties of foamed asphalt stabilised base materials

Khosravifar

Schwartz

Goulias

2014

International Journal of Pavement Engineering

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Foamed asphalt stabilised base (FASB) material is a partially bound material consisting of four phases of aggregate skeleton, air voids, foamed binder and water. Its mechanical properties and behaviour are greatly influenced by field placement and curing conditions. Given appropriate design and application, the structural capacity of FASB lies somewhere between granular aggregate base (GAB) and hot mix asphalt. Therefore, when FASB is used in the place of GAB, the required thickness of the pavement section can be reduced, resulting in cost savings in addition to recycling benefits. The objective of this study was to investigate and explain the distinct mechanical behaviour of this material and address the most important performance-related parameters of FASB -stiffness and permanent deformation resistance. Triaxial dynamic modulus (jE*j) and repeated load permanent deformation (RLPD) tests were performed on field-cured FASB cores. The influence of confining stress on dynamic modulus was found minor as compared with that of loading rate and temperature. At a 258C temperature and a 10 Hz loading rate typical for base layer conditions in high-volume highway pavements, the mean value of dynamic modulus of a new FASB was found to be 4310 MPa, much greater than what would be expected from conventional GAB. RLPD test results demonstrated satisfactory resistance to rutting. The in situ long-term stiffness of FASB measured using a Dynatest falling weight deflectometer was of an order of magnitude greater than the stiffness of GAB. A structural layer coefficient of 0.142 cm 21 (0.36 in. 21 ) was recommended for this material for use in the empirical 1993 American Association of State Highway and Transportation Officials design procedure.

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Section: Test Methodsmentioning

confidence: 99%

Section: Repeated Load Permanent Deformationmentioning

confidence: 98%

Section: Permanent Deformationmentioning

confidence: 99%

Section: Repeated Load Permanent Deformationmentioning

confidence: 99%

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Mechanistic structural properties of foamed asphalt stabilised base materials

Khosravifar

Schwartz

Goulias

2014

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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