Structural sensitivity of an asphalt pavement to asphalt binder content and mix design method

Carmo, Cássio Alberto Teoro do; Pereira, Géssica Soares; Marques, Geraldo Luciano de Oliveira; Borges, Paulo Roberto Pereira

doi:10.14295/transportes.v29i4.2456

Cited by 3 publications

(3 citation statements)

References 7 publications

(10 reference statements)

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“…Poor gradation of aggregates resulting in low stability and flow as well as excess voids in the concrete was apparent and capable of inducing pavement failure. This results agreed with the works of similar authors including [3], [6] and [16]. Voids of the order of 6.0 % and flow of 6.3 mm observed along Ado -Ikere road with associated poor stability as low as 320 kg could compromise the integrity of the asphaltic concrete for road construction within the given geological environment.…”

Section: Iv2 Influence Of Gradationsupporting

confidence: 92%

Influence of gradation on the performance of asphaltic mixes

Oyedele

2023

ITEGAM

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An assessment of asphaltic mixes on failed sections along Ado -Ikere road, Southwest Nigeria has been carried out. The study has been designed to fully understand and account for the incessant pavement failures aside soil characterization. Samples of asphalt concrete were collected from failed sections along the road. The samples were subjected to density measurements, bitumen extraction, sieve analysis, hot mix Marshall Stability and flow tests. Values ranging between 6.01 -6.45 %, 320 -365 kg, 3.6 -5.9 mm, 4.2 -6.0 % were obtained for bitumen content, stability, flow, voids in total mix, respectively. The results revealed influence of gradation on the performance of asphaltic mixes. Poor gradation of aggregates resulting in low stability and flow as well as excess voids in the concrete was apparent and capable of inducing pavement failure. The asphaltic mixes significantly fell out of the limits in the criteria of the 2007 Federal Ministry of Works and Housing Standard Specifications for Roads and Bridges (FMW). Strict adherence to standards regarding asphalt concrete mix used for pavement construction is imperative to rule out the nature of asphaltic mixes as a possible cause of premature failure of road pavements.

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Section: Iv2 Influence Of Gradationsupporting

confidence: 92%

Influence of gradation on the performance of asphaltic mixes

Oyedele

2023

ITEGAM

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“…It was revealed that the permanent deformations of asphalt concrete can influence its mechanical response of materials. Carmo et al, (2021), [6] studied the strength sensitivity of asphalt concrete pavement, which exhibits variations in its mechanical properties due to the changes of asphalt cement binder content. A variation in the binder of ± 0.5% within the optimum asphalt contents was implemented as a service tolerance during the asphalt mixture preparation process.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Durability Issues of Asphalt Concrete Mixtures

Sarsam

2023

CEBEL

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The asphalt concrete mixture is prone to environmental issues such as moisture damage and ageing. This may exhibit a great significance in the service performance of asphalt concrete pavement mixtures which may be more susceptible to many types of early distresses throughout its fatigue life. In the present investigation, asphalt concrete mixtures were prepared and compacted with the aid of laboratory roller compaction into a slab samples. optimum binder content was implemented. Extra samples were prepared at higher and lower binder content of 0.5 % (above and below the optimum). Asphalt concrete beam specimens were obtained from the prepared slab samples with the aid of a diamond saw. Part of the Asphalt concrete beam specimens were tested under four point’s repeated flexural stresses after practicing moisture damage while another part was subjected to long term ageing. The rate of change in the flexural strength was monitored and compared among the various testing conditions at 20 ºC environment and under constant micro-strain level of 750. It was observed that the lower flexural strength was observed for moisture damaged specimens while higher flexural strength could be detected for aged specimens as compared with the control mixtures. The binder content exhibits a significant influence on flexural strength of the asphalt concrete specimens since it declines significantly at higher or lower binder content as compared with that of specimens prepared at the optimum.

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“…Carmo et al, (2021) assessed the structural sensitivity of asphalt concrete, which can show variations in the mechanical properties due to the variations of asphalt cement binder content. The indirect tensile strength was implemented as an indicator for the structure analysis.…”

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confidence: 99%

Variation of initial stiffness under variable strain levels and binder content

Sarsam¹

2023

IJE

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At moderate pavement temperature, the initial stiffness of asphalt concrete is controlled by the asphalt binder content and can sustain the various vehicular loading. The aim of the present investigation is to monitor the variation in the initial flexural stiffness percentage throughout the asphalt concrete fatigue life among variable constant strain levels and asphalt binder content. Mixtures of Asphalt concrete were prepared in the laboratory using the optimum binder content and extra mixtures were prepared with a variation in the binder content of ± 0.5% within the optimum asphalt contents as a service tolerance during the asphalt mixture preparation process. The mixtures were compacted in a slab mold using laboratory rollers. Beam specimens of asphalt concrete have been obtained from the prepared slab samples and tested under dynamic flexural stresses under three constant microstrain levels of (750, 400 and 250) and tested for flexure at 20℃ environments. It was noticed that the asphalt concrete fatigue life at 400 microstrain level decline by (95, 86.6 and 96.5) % for mixtures prepared with (4.8, 4.3 and 5.3) % asphalt cement binder respectively as compared with mixtures sustaining constant microstrain level of 250.However, the fatigue life at 750 microstrain level decline by (98.1, 83.3 and 96.5) % for mixtures prepared with (4.8, 4.3 and 5.3) % asphalt cement binder respectively as compared with mixtures sustaining constant microstrain level of 250.

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Structural sensitivity of an asphalt pavement to asphalt binder content and mix design method

Cited by 3 publications

References 7 publications

Influence of gradation on the performance of asphaltic mixes

Influence of gradation on the performance of asphaltic mixes

Monitoring the Durability Issues of Asphalt Concrete Mixtures

Variation of initial stiffness under variable strain levels and binder content

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