Effects of warm mix additives on the thermal stress and ductile resistance of asphalt binders

Xu, Jiaqiu; Yang, En-Hui; Luo, Haoyuan; Ding, Haibo

doi:10.1016/j.conbuildmat.2019.117746

Cited by 21 publications

(11 citation statements)

References 40 publications

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“…The critical cracking temperature ( T CR ) calculation is employed to evaluate the anti-cracking performance of oil-rejuvenated asphalts at low temperatures. T CR is a non-strength test index determined in the stiffness modulus data, while the stiffness modulus data are obtained from the extended bending beam rheological test [ 1 ]. This method can better reflect the ultimate performance of the asphalt at low temperatures than the PG test.…”

Section: Methodsmentioning

confidence: 99%

“…The asphalt binder is the residue from petroleum refining and has been used as a modern road material for 200 years owing to its suitable viscoelastic behavior. A quality asphalt binder is expected to have sufficient toughness, adaptability to deformation at low temperatures [ 1 ], sufficient modulus, and elastic recovery at high temperatures [ 2 ]. Moreover, it should be able to quickly absorb the energy from repetitive loads and release stresses during the temperature range in which it normally operates [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

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Correlation Analysis between Mechanical Properties and Fractions Composition of Oil-Rejuvenated Asphalt

et al. 2022

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To clarify the intrinsic relationship between the mechanical properties of asphalt and its fraction composition, the SARA fraction composition and six macroscopic mechanical properties (critical cracking temperature (TCR), fatigue life (Nf), non-recoverable creep (Jnr3.2), penetration, ductility, and softening point) were investigated for 16 asphalt samples. Fraction contents of asphaltene and aromatic are strongly correlated with TCR and ductility (R2 > 0.92) that characterize the ability of asphalt to adapt to deformation at low and medium temperatures. Heavy fraction (asphaltene and resins) content is also strongly correlated with (R2 > 0.90) penetration and Jnr3.2 that characterize the resistance of the asphalt to overall deformation at medium and high temperatures. To express the changes in the four fractions simultaneously with one indicator, a statistic, average deviation of the fractions between the given asphalt and its original (marked σ), is introduced in this study to characterize the degree of asphalt aging based on the fraction changes. It normalizes the four simultaneous change indicators (percentage of SARA fractions) during asphalt aging into one indicator. This new indicator has a strong correlation with several mechanical performance indicators of asphalt, where it is strongly correlated with TCR (R2 > 0.90), ductility, and penetration, which are also well correlated with Jnr3.2 (R2 > 0.85), Nf (R2 > 0.75), and softening point (R2 > 0.75).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlation Analysis between Mechanical Properties and Fractions Composition of Oil-Rejuvenated Asphalt

et al. 2022

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“…The critical cracking temperature T cr can be subsequently derived from the single asymptote procedure (SAP) without the need for more sophisticated strain-controlled relaxation modulus test [17]. Moreover, Xu et al [18] demonstrated that σ(T) and T cr could be used to effectively analyze the influence of WMA additives (Sasobit and Et-3100) on the low-temperature properties of asphalt binder materials.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Cracking Resistance of Recycled Rubber Asphalt Binder Composed of Warm-Mix Additives

Gui

Wang

et al. 2022

Materials

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Warm-mix asphalt technology has been applied to recycled rubber asphalt binder (RAB), which forms warm-mixed crumb rubber-modified asphalt binder (W-RAB) as a “green” material for environmental conservation and to enhance road performance. Furthermore, low-temperature cracking is one of the major distresses for asphalt pavement, which drastically restricts ride quality and service level. Therefore, the main objective of this study is to comparatively analyze the low-temperature properties of W-RABs based on thermal stress and the simple fractional model. W-RABs were obtained by mixing 60 mesh recycled rubber (CR) and two different types of warm-mix additives, namely viscosity reducer (1, 2, and 3%) and surfactant (0.4, 0.6, and 0.8%). First, Hopkins and Hamming’s numerical algorithm and the Boltzmann superposition principle were used for obtaining thermal stress σ(T). Subsequently, critical cracking temperature Tcr was derived using the single asymptote procedure (SAP) theory. Second, the simple fractional viscoelasticity model was used to calculate the creep compliance, damping ratio, and dissipation energy ratio, and the results were compared with the Superpave protocol results obtained with bending beam rheometer (BBR) tests. The results showed that a combination of CR and warm-mix additives could slightly improve the thermal crack resistance of the asphalt binder. The addition of 0.6% surfactant yielded the optimum performance, while only a high dosage (3%) of viscosity reducer provided a marked improvement in efficiency, which decreased with a decrease in temperature. This study recommends the use of RAB composited with 0.6% surfactant for areas with extremely low temperature.

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“…Force ductility test is widely used method for bitumen testing. As presented in Figure 2 , the behavior of both SBS modified and non-modified bitumen was analyzed by other researchers [ 33 , 34 , 35 ]. The results of ductility test (European version of double-edge-notched tension test) of the studies bear resemblance to the shape presented in Figure 2 .…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Tensile Properties of Styrene–Butadiene–Styrene Modified Asphalt Binders

et al. 2021

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The requirements imposed on road pavements are ever increasing nowadays, necessitating the improvement of the properties of paving materials. The most commonly used paving materials include bituminous mixtures that are composed of aggregate grains bound by a bituminous binder. The properties of bitumens can be improved by modification with polymers. Among the copolymers used for modifying bitumens, styrene–butadiene–styrene, a thermoplastic elastomer, is the most commonly used. This article presents the results of tests conducted on bitumens modified with two types of styrene–butadiene–styrene copolymer (linear and radial). Two bitumen types of different penetration grades (35/50 and 160/220) were used in the experiments. The content of styrene–butadiene–styrene added to the bitumen varied between 1% and 6%. The results of the force ductility test showed that cohesion energy can be used for qualitative evaluation of the efficiency of modification of bitumen with styrene–butadiene–styrene copolymer. The determined values of the cohesion energy were subjected to the original analysis taking into account the three characteristic elongation zones of the tested binders. The performed analyses made it possible to find a parameter whose values correlate significantly with the content of styrene–butadiene–styrene copolymer in the modified bitumen. With smaller amounts of added modifier (approximately 2%), slightly better effects were obtained in the case of linear copolymer styrene–butadiene–styrene and for larger amounts of modifier (5–6%) radial copolymer styrene–butadiene–styrene was found to be more effective. This is confirmed by the changes in the binder structure, as indicated by the penetration index (PI).

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Effects of warm mix additives on the thermal stress and ductile resistance of asphalt binders

Cited by 21 publications

References 40 publications

Correlation Analysis between Mechanical Properties and Fractions Composition of Oil-Rejuvenated Asphalt

Correlation Analysis between Mechanical Properties and Fractions Composition of Oil-Rejuvenated Asphalt

Cracking Resistance of Recycled Rubber Asphalt Binder Composed of Warm-Mix Additives

Experimental Study of Tensile Properties of Styrene–Butadiene–Styrene Modified Asphalt Binders

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