Improving the Low-Temperature Performance of RET Modified Asphalt Mixture with Different Modifiers

Xu, Cheng; Zhang, Zhengqi; Liu, Feifei

doi:10.3390/coatings10111070

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…The results showed that the higher the temperature and longer the time during the preparation of CR and SBS composite-modified asphalt, the better the high-temperature performance, but the increase in temperature and time would be detrimental to the low-temperature performance. Many researchers have attempted to compositely modify matrix asphalt with SBS modifiers and various agents [ 5 , 6 ], such as poly phosphoric acid (PPA), reactive ethylene terpolymer (RET), and high modulus agents, to enhance its overall performance and economic benefits. However, the results were not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Chen

Shi

et al. 2023

Polymers

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Rice husk biochar (RHB) is a renewable agricultural waste, and its fixation on pavements helps develop environmentally friendly, economical, and sustainable asphalt pavements. This paper used RHB to replace part of styrene-butadiene-styrene (SBS) for the composite modification study of matrix asphalt. The high- and low-temperature properties and microscopic mechanisms of the composite-modified asphalt were studied through a series of tests. The results showed that, compared with SBS-modified asphalt, the softening point, viscosity, complex shear modulus, stiffness modulus, and rutting factors of RHB-SBS composite-modified asphalt were improved. In contrast, the ductility and creep rate were slightly decreased, indicating an improvement in the high-temperature performance of composite-modified asphalt, but a slight decrease in its low-temperature performance. The process of RHB and SBS composite modification was mainly physical blending, with only a small number of chemical reactions, and no new functional groups were generated. The porous structure of RHB enables it to adhere better to the network crosslinked continuous phase system formed by SBS and matrix asphalt. This results in composite-modified asphalt with good high-temperature storage stability and rheological properties. Therefore, RHB-SBS composite-modified asphalt can be applied to high-temperature areas and rice-producing areas, and the optimal content of RHB is suggested to be 15%.

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Section: Introductionmentioning

confidence: 99%

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Chen

Shi

et al. 2023

Polymers

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“…Indoor evaluation methods for the tensile performance of asphalt mixture mainly include the indirect tension test [ 26 , 27 , 28 ], bending beam test [ 29 , 30 ], semi-circular bending test [ 23 , 31 ], and direct tension test [ 32 ]. Research by direct tension test is scarce, and studies on fiber-reinforced asphalt mixture by direct tension test are even fewer.…”

Section: Introductionmentioning

confidence: 99%

Influence of Fiber Type and Dosage on Tensile Property of Asphalt Mixture Using Direct Tensile Test

Yang

Zhou

2023

Materials

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In engineering practice, fiber addition is a frequently used method to improve the tensile property of asphalt mixture. However, the optimum fiber type and dosage have not been determined by direct tensile tests. In this paper, monotonic tensile tests were conducted on three kinds of stone mastic asphalt (SMA13) mixtures, that is, granular-lignin-fiber-reinforced SMA (GFSMA), flocculent-lignin-fiber-reinforced SMA (FFSMA), and basalt-fiber-reinforced SMA (BFSMA) at different fiber dosages to probe the influence of fiber dosage on their tensile mechanical indexes (tensile strength, ultimate strain, elastic modulus, and strain energy density) and to determine the optimum dosage of each kind of fiber. The results showed that with the elevation of fiber dosage, the tensile strength, elastic modulus, and strain energy density of all three kinds of asphalt mixtures increased first and then decreased, while the ultimate strain increased constantly. The optimum dosage was 0.50 wt%, 0.45 wt%, and 0.50 wt% for granular lignin fiber, flocculent lignin fiber, and basalt fiber, respectively. On this basis, strain-controlled direct tensile fatigue tests were conducted on the three kinds of asphalt mixtures at the corresponding optimum fiber dosage. The results indicated that asphalt mixture reinforced with 0.50 wt% granular lignin fiber exhibited ideal direct tensile fatigue performance with respect to fatigue life and accumulative dissipated energy. Therefore, granular lignin fiber is recommended as the favorable fiber type, and its optimum dosage is 0.50 wt%. Moreover, scanning electron microscopy (SEM) demonstrated that the essence of the impact of fiber dosage and type on the tensile property of SMA is whether the reinforcement effect on the mixture matrix outweighs the negative effect of the defects between fiber and mixture matrix, or whether the reverse applies.

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“…(2011) found that the OGFC mixture containing recycled polyethylene fiber had a higher resistance to permanent deformation, fatigue damage, and moisture sensitivity compared to the mixture without fiber. Using freeze-thaw splitting tests and economic analysis, Xu et al (2020) found that optimized modifiers could improve the lowtemperature performance and rutting resistance of the reactive elastomeric terpolymer modified asphalt mixture (RETM) to varying degrees; however, it had little effect on the economy of RETM.…”

Section: Introductionmentioning

confidence: 99%

Freeze–Thaw damage characteristics of composite modified open graded friction course

Lin¹,

Song³

et al. 2022

Front. Mater.

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To reasonably describe the damage characteristics of composite modified open graded friction course (OGFC) after multiple freeze-thaw cycles, based on the Able viscoelastic constitutive equation, a viscoelastic model of freeze-thaw damage was constructed and analyzed using the Weibull distribution function, damage mechanics, and fractional derivative theory. Under the conditions of composite modified OGFC mixtures with different mixing ratios (12%, 0%), (12%, 1%), and (12%, 2%), and multiple freeze-thaw cycles (0–16), low-temperature bending and creep tests of the mixtures were carried out. The stress-strain curve data obtained were fitted to analyze the physical significance of the model parameters. The results show that the model is suitable for characterizing the viscoelastic stage of composite modified OGFC under 10 freeze-thaw cycles. The freeze-thaw damage model parameters of three types of composite modified OGFC with different mixing ratios were compared and analyzed. The order of the fractional derivative of the composite modified OGFC model (12%, 1%) was 0.2223, the maximum damage threshold was 1.108, and the maximum viscosity coefficient was 371.84. This composite modified OGFC had the best low-temperature crack resistance.

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Improving the Low-Temperature Performance of RET Modified Asphalt Mixture with Different Modifiers

Cited by 8 publications

References 27 publications

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

Influence of Fiber Type and Dosage on Tensile Property of Asphalt Mixture Using Direct Tensile Test

Freeze–Thaw damage characteristics of composite modified open graded friction course

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