Effects of RH-WMA additive on rheological properties of high amount reclaimed asphalt binders

Gungat, Lillian; Yusoff, Nur Izzi Md.; Hamzah, Meor Othman

doi:10.1016/j.conbuildmat.2016.03.182

Cited by 34 publications

(6 citation statements)

References 22 publications

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“…e MSCR test according to AASHTO TP70 [37] is conducted on the binders to evaluate the high-temperature performance of rutting resistance on the basis of the creep characteristic of binders [21,38,39]. All the binders were short-term aged using RTFO test.…”

Section: Multiple Stress Creep Recovery (Mscr) Testsmentioning

confidence: 99%

“…WMRA has the following advantages: (1) it can effectively reduce the heating temperature of RAP by about 20°C so as to reduce the bonding of RAP in the heating barrel and improve the proportion of RAP to over 40% [20]; (2) the warm mix technology can reduce the construction temperature of recycled asphalt mixture by 20°C to 40°C, prevent secondary aging of asphalt in RAP, save energy, reduce the emission of asphalt fume and toxic gases, and truly realize green transportation and resource recycling; and (3) the construction workability is improved. As the cooling rate of WMRA mixture is generally 50% of that of hot-mix recycled asphalt mixture, the compaction time of WMRA mixture can be prolonged, so that the compaction time is more sufficient and compaction is more effective [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Research on Rheological Properties of High‐Percentage Artificial RAP Binder with WMA Additives

Wang

Huang

Qin

et al. 2020

Advances in Materials Science and Engineering

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With the development of pavement recycling technology, the requirement of reclaimed asphalt pavement (RAP) is substantially increasing. Warm-mix recycled asphalt (WMRA) technology has made great progress, which can effectively decrease the working temperature and improve the RAP content. In this study, the rheological properties of recycled binders with incorporation of high-percentage artificial RAP binder (30–70%) were evaluated using two types of warm-mix asphalt (WMA) additives, i.e., polyethylene wax R and surfactant M. The dynamic shear rheometer (DSR) and beam bending rheometer (BBR) tests were conducted on the recycled binders. The results showed that the temperature and frequency played an important role in determining the complex shear modulus of the high-percentage WMRA binders. The dependency of phase angle on frequency increased after the long-term aging. The WMA additive R had a relatively huge impact on the rheological properties of asphalt, which mainly occurred before the PAV aging of recycled asphalt binder; the WMA additive M had no significant impact on the rheological properties of recycled asphalt binder. The WMA additive R enhanced the low-temperature rheology of recycled asphalt binder, while the WMA additive M enhanced the high-temperature rheology of recycled asphalt binder. Both of these types of WMA additives improved the antifatigue performance of recycled asphalt binder. The increased content of RAP binder improved the high-temperature performance and reduced the low-temperature performance of the recycled asphalt binder. However, it had no obvious impact on the fatigue performance. In addition, there was a good linear relation between the RAP binder content and the two indexes of the multiple stress creep recovery (MSCR) test.

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Section: Multiple Stress Creep Recovery (Mscr) Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Rheological Properties of High‐Percentage Artificial RAP Binder with WMA Additives

Wang

Huang

Qin

et al. 2020

Advances in Materials Science and Engineering

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“…These results are similar to those obtained by Gungat et al [24], where the addition of RH-WMA resulted in lower binder viscosity and the mixing temperature was reduced to 20 °C. Gungat et al [25] also conducted a study using RH-WMA and the results of their study showed that viscosity decreased with higher temperature, and the viscosity of the bitumen was significantly altered at lower temperature. These results have been confirmed in field studies.…”

Section: Viscosity Test At Varying Temperaturementioning

confidence: 99%

Determining the Effects of Rh-Wma on the Engineering Properties of Bitumen

et al. 2019

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This study aims to investigate the engineering properties (i.e., physical, chemical, and adhesion properties) of bitumen incorporated with RH-Warm Mix Asphalt (RH-WMA) additive. Base bitumen with a penetration grade of 80/100 was added with 3.0, 3.5, and 4.0% RH-WMA (by total weight of bitumen). The Response Surface Method (RSM) was used to determine the optimum values of the base bitumen and RH-WMA additive which meet the bitumen specification with penetration and softening point chosen as responses in the design layout. Three solutions of 3.04, 3.55 and 3.91% RH-WMA additive that were obtained from the RSM analysis were selected as the optimal values. Results of the physical tests show that adding RH-WMA increases the penetration and ductility values whilst simultaneously reducing the value for the softening point. Analysis of viscosity at various temperatures shows that RH-WMA additive lowers viscosity when the temperature was raised from 100 to 165 °C. The lower viscosity of the modified binders improves their workability. The result of the Fourier Transform Infrared (FTIR) test shows that there is no complex chemical reaction between the base bitumen and the RH-WMA. The surface free energy (SFE) test conducted on the base bitumen and the RH-WMA modified bitumen shows that the total SFE component of the base bitumen increases when higher amounts of RH-WMA was incorporated. The addition of 3.5% RH-WMA results in the highest SFE value of 24.98 mJ/m2. The increase in the total SFE suggests good adhesion between the bitumen and the aggregates.

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“…Oliveira et al [14] indicated that the rutting resistance of HMA and RAP mixes was improved with the addition of a surfactant-based additive, however, the effect was mostly recognized in RAP mixtures. Gungat et al [15] used a multiple stress creep and recovery (MSCR) test to investigate the effect of RH-WMA (combination of polyethylene and wax) on asphalt mixtures incorporating 30, 40, and 50% RAP, and noticed an improvement in the rutting resistance with the increase in RAP content. Zhao et al [16] conducted asphalt pavement analyzer, Hamburg wheel tracking, and flow number tests on asphalt samples mixed with a foaming WMA additive, and incorporating RAP contents of 15% and 30%.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Warm Mix Additive on the Properties and Mechanical Performance of Recycled Asphalt Mixtures

et al. 2022

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Newer technologies such as warm mix asphalt (WMA) and reclaimed asphalt pavement (RAP) have gained international approval and have been considered as appropriate solutions that support the sustainability goals of the highway sector. However, both technologies present some shortcomings. The lower mixing and compaction temperatures of WMA reduce the binder aging and the bond between the aggregates and the coating binder, thus resulting in less rutting resistance and higher moisture susceptibility. On the other hand, RAP mixes tend to be stiffer and more brittle than conventional hot mix asphalt (HMA) due to the effect of aged binder. This tends to increase the crack propagation distresses. In an attempt to overcome their individual shortcomings, this study investigated the new concept of a combined WMA-RAP technology. The chemical WMA additive Rediset LQ1102CE was utilized with mixtures incorporating low (15%), medium (25%), and high (45%) RAP contents. Dynamic modulus (DM) and flow number (FN) tests were conducted to investigate the effect of Rediset on the behavior of RAP mixtures. The dynamic modulus |E*| mastercurves were developed using the sigmoidal model and Franken model was used to fit the accumulated permanent deformation curve. The results of this study showed that Rediset addition improved the cracking resistance of RAP mixtures. However, the rutting resistance was reduced but kept within the acceptable range except for mixtures containing low RAP content.

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Effects of RH-WMA additive on rheological properties of high amount reclaimed asphalt binders

Cited by 34 publications

References 22 publications

Research on Rheological Properties of High‐Percentage Artificial RAP Binder with WMA Additives

Research on Rheological Properties of High‐Percentage Artificial RAP Binder with WMA Additives

Determining the Effects of Rh-Wma on the Engineering Properties of Bitumen

Effect of Chemical Warm Mix Additive on the Properties and Mechanical Performance of Recycled Asphalt Mixtures

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