Impact of the Superpave hot mix asphalt properties on its permanent deformation behavior

Qasim, Zahra Ibrahim; Abed, Alaa H.; Qasim, Zaynab I.

doi:10.1051/matecconf/201816201041

Cited by 2 publications

(4 citation statements)

References 3 publications

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“…The obtained stability value was corrected for volume. Previous research examined water immersion periods (1, 3 and 7) to assess moisture damage for longer periods than standard duration each [15,16].Voids in Coarse Aggregate (VCA) to aggregate in Dry Rod Conditions (VCA DRC ) as well as for blend (VCA MIX ) had also been measured by employing the following equations; (Brown and Cooley, 1999) [17]:…”

Section: Marshall Test and Volumetric Featuresmentioning

confidence: 99%

“…This accomplished by applying AASHTO T283"Resistance of Compacted Bituminous Mixture to Moisture-Induced Damage" [19] and ASTM D 4867 [20], compaction was done for samples to 6% air voids according to AASHTO Designation: M 325-08 (2012) standard specification for Stone Matrix Asphalt (SMA), single subsection of three examples was regarded as controlling example, the other one of three examples represents the conditioning subsection. The conditioning subsection is exposed to vacuum immersion pursued by a discretionary freezing cycle, then adding an extra immersion period for the samples at 60 ºC for separate periods (1, 3 and 7 days) .Previous researchers examined water immersion periods of (1, 3 and 7) to assess moisture damage for longer periods than standard duration [15,16]. Following the conditioning method, the two subgroups were screened for the indirect stiffness of the indirect traction device at the same velocity Figures 12, by increasing the SBS polymer content, the "indirect tensile strength" of the unconditioned and conditioned sample increases.…”

Section: Indirect Tensile Strength Ratio Testmentioning

confidence: 99%

“…A study conducted in Ontario, Canada, by the Ministry of Transportation on SMA pavement slabs trafficked with a wheel-tracking machine gave less rut depths in comparison to that occurring in a dense friction coarse [7]. Coarse aggregate have the most important role in obtaining high rutting resistance of SMA and that's why regulations emphasize on type and quality of aggregate [8]. Interlock between coarse aggregates, which constitute the skeleton of SMA, is an important factor of rutting performance of these mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Modified Asphalt Cement of the Performance of Stone Matrix Mixtures

Qasim¹,

Helo²

2020

ETJ

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This research investigates the behavior of Stone Matrix Asphalt mixtures (SMA) modified with styrene-butadiene-styrene (SBS) polymer at four percentages (1, 2, 3 and 4%) by weight of asphalt cement. The moisture susceptibility and rutting were taken into consideration in this study. To achieve the objective of this research the superpave system is conducted to design the asphalt mixtures. The physical properties of aggregate, bitumen and other mix materials were assessed and evaluated with the laboratory tests. The mixtures were prepared using penetration Graded (40-50) bitumen and a chemical named Polypropylene Fibers was used as a stabilizing additive. Fibers have been used in SMA mixtures for two main reasons: To increase the toughness and fracture resistance of hot mix asphalt (HMA) and to act as a stabilizer to prevent drain down of the asphalt binder. The laboratory tests include indirect tensile strength test, Marshall stability and retained Marshall Stability test (RMS). For rutting test the Roller wheel compactor is used for preparing the asphaltic samples and Wheel tracking device is used to evaluate the rutting of asphaltic slabs. The results showed that the SBS polymer asphalt mixture gave better moisture sensitivity and better fracture resistance according to the study.It is noted that indirect tensile strength ratio (TSR) increases by 93.1 % and the rut depth decreases by 32.5 % when adding 3% SBS polymer to SMA.

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Section: Marshall Test and Volumetric Featuresmentioning

confidence: 99%

Section: Indirect Tensile Strength Ratio Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Modified Asphalt Cement of the Performance of Stone Matrix Mixtures

Qasim¹,

Helo²

2020

ETJ

Self Cite

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“…Causing factors of permanent deformation of asphalt mixture were divided into internal factors and external factors [5,6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Permanent Deformation Behavior of Steel Slag Asphalt Mixture under Indoor Simulation

Wei

Yang

Xie

et al. 2021

Advances in Civil Engineering

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Previous studies have indicated that steel slag can be used as a substitute for natural aggregates in asphalt mixture, while little attention has been paid to systematic investigation of the influences of various external environmental factors on deformation resistance of steel slag asphalt mixture. In order to understand the service behavior of steel slag asphalt mixture, its permanent deformation under different condition was investigated based on an indoor simulation test. The chemical composition, microscopic structure, surface texture, and volume stability of steel slag were firstly characterized. The uniaxial repeated loading test and standard wheel-tracking test were applied to evaluate the effect of temperature, stress levels, and water damage on the permanent deformation of AC-16 and AC-20 steel slag asphalt mixtures. The results indicate that a higher content of alkaline oxide and high-grade texture index existing in steel slag contribute to its strong absorptivity and adhesion of asphalt. The steel slag demonstrates fine volume stability due to its lower free-CaO (f-CaO) content, autoclave chalked ratio, and immersion expansion ratio. The permanent deformation of steel slag asphalt mixtures increases rapidly under higher stress and temperatures in contrast to lower increment at lower stress and temperatures. Asphalt mixtures at higher stress and higher temperatures and water condition exhibit larger rutting deformation and inferior rutting resistance. AC-16 steel slag asphalt mixture has superior resistance to permanent deformation than AC-20 asphalt mixture. Rutting factors show different degrees of impact in a decreasing order of temperature, water damage, and stress levels. The findings have significant implications for providing a theoretical basis for reusing steel slag in pavement construction and facilitating engineering application of steel slag asphalt mixture.

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Impact of the Superpave hot mix asphalt properties on its permanent deformation behavior

Cited by 2 publications

References 3 publications

Effect of Modified Asphalt Cement of the Performance of Stone Matrix Mixtures

Effect of Modified Asphalt Cement of the Performance of Stone Matrix Mixtures

Investigation of Permanent Deformation Behavior of Steel Slag Asphalt Mixture under Indoor Simulation

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