Laboratory Evaluation of Storage Stability for CRM Asphalt Binders

Yun, Jihyeon; Hemmati, Navid; Lee, Moon-Sup; Lee, Soon-Jae

doi:10.3390/su14137542

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…Previous research conducted by [29] explored the modification of crumb rubber modifiers (CRMs) using a base binder known as PG 64-22. The modification process entailed the combination of crumb rubbers with the binder at a temperature of 178 ± 2 • C over a period of 30 min.…”

Section: Production and Sampling Of Crumb Rubber Modified Asphalt Bin...mentioning

confidence: 99%

Effect of Crumb Rubber Modifier Particle Size on Storage Stability of Rubberized Binders

Vigneswaran,

Yun,

Jeong

et al. 2023

Sustainability

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This research study aimed to assess the influence of different particle sizes of crumb rubber modifier on phase separation when mixed with virgin asphalt binder (PG 64-22). Both Superpave and multiple stress creep recovery (MSCR) tests were conducted to determine the optimal particle size. Three sizes of crumb-rubber particles (≤0.5 mm, ≤1 mm, and 1–2 mm) were individually incorporated into the binder at a weight proportion of 10%. The findings revealed that an increase in particle size resulted in higher viscosity, which reduced workability. However, the use of particles with a size of ≤0.5 mm effectively decreased viscosity. Furthermore, larger particle sizes enhanced resistance to rutting and improved the lifespan of the pavement. Multiple shear creep recovery (MSCR) tests confirmed that larger crumb-rubber particles exhibited a higher load-bearing capacity. Additionally, phase separation studies demonstrated that larger particle sizes were associated with increased phase separation. Notably, particles with a size of ≤0.5 mm performed exceptionally well in reducing phase separation across all combinations. In conclusion, crumb-rubber particles with a size of ≤0.5 mm were identified as the most effective in minimizing phase separation when blended with virgin asphalt binder. These findings provide solid scientific evidence related to the effects of crumb-rubber particles on the storage stability of rubberized asphalt binder and have significant implications for future research in this field.

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Section: Production and Sampling Of Crumb Rubber Modified Asphalt Bin...mentioning

confidence: 99%

Effect of Crumb Rubber Modifier Particle Size on Storage Stability of Rubberized Binders

Vigneswaran,

Yun,

Jeong

et al. 2023

Sustainability

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“…For the model, the following boundary conditions were used: there was no lateral horizontal displacement, there was no vertical displacement at the bottom, and the layers of the pavement were in complete contact. Asphalt pavements have viscoelastic-plastic characteristics under the action of load and temperature [30]; rutting is mainly caused by creep deformation. Therefore, the Drucker-Prager model was adopted, as shown in Equation (1).…”

Section: Test Materialsmentioning

confidence: 99%

Study on Vehicle–Road Interaction for Autonomous Driving

Guo

Liu

et al. 2022

Sustainability

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Autonomous vehicles (AVs) are becoming increasingly popular, and this can potentially affect road performance. Road performance also influences driving comfort and safety for AVs. In this study, the influence of changes in traffic volume and wheel track distribution caused by AVs on the rutting distress of asphalt pavement was investigated through finite element simulations. A vehicle-mounted three-dimensional laser profiler was used to obtain pavement roughness and texture information. The vehicle vibration acceleration was obtained through vehicle dynamics simulations, and the skid resistance indexes of 20 rutting specimens were collected. The results showed that an increase in traffic volume caused by the increasing AV traffic accelerated the occurrence of rutting distress; however, the uniform distribution of vehicles at both ends of the transverse direction could prolong the maintenance life of flexible and semi-rigid pavements by 0.041 and 0.530 years, respectively. According to Carsim and Trucksim vehicle simulations and multiple linear regression fitting, the relationship models of three factors, namely speed, road roughness, and comfort, showed high fitting accuracies; however, there were some differences among the models. Among the texture indexes, the arithmetic mean’s height (Ra) had the greatest influence on the tire–road friction coefficient; Ra greatly influenced the safe driving of AVs. The findings of this study were used to present a speed control strategy for AVs based on the roughness and texture index for ensuring comfort and safety during automatic driving.

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“…Furthermore, certain modified asphalt binders may incur higher costs, potentially imposing an additional economic drawback on road construction and maintenance, underscoring the significance of comprehensive quality control for both asphalt binders and mixtures [11]. For modified asphalt binders, one of the biggest challenges is ensuring the stability of storage for quality control [12][13][14]. As an example, asphalt binders stored in tanks may undergo a separation between the polymer and bitumen phases.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Evaluation of Storage Stability for Asphalt Binder Modified with Crumb Rubber and Styrene–Isoprene–Styrene Depending on Evaluation Factors and Blending Condition

Yun,

Vigneswaran,

Kim

et al. 2024

Materials

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Modified asphalt binders are still considered important in asphalt pavement. However, the comprehensive use of various modifiers is limited due to storage stability issues. Moreover, there is a scarcity of detailed analyses regarding the degree of separation for asphalt binders among each method despite the utilization of various methods to assess the storage stability of binders. Therefore, a comprehensive analysis was conducted to assess the storage stability of asphalt binder modified with a crumb rubber modifier (CRM) and styrene–isoprene–styrene (SIS), utilizing five evaluation factors following the ASTM D7173 guidelines based on four mixing methods (A: high-shear mixing method, B: low-speed agitating method, C: high-shear mixing method + low mixing method, D: low-speed agitating method + low mixing method). To produce the modified asphalt binder, the proportions of the CRM were 5% and 10% for each binder, and 10% SIS was added to all binders. The results in this study convey that (1) the addition of the modifier led to an increase in G*/sin δ with different mixing methods, but using mixing methods (C and D) for a relatively long time resulted in a lower G*/sin δ, indicating suboptimal performance; (2) through the multiple stress creep recovery (MSCR), rheological properties of Jnr and % rec exhibited trends similar to G*/sin δ evaluation, highlighting an improved elastic recovery with a higher modifier content; (3) storage stability assessment revealed consistent trends in high-shear mixing groups (A and C), while low-speed mixing groups (B and D) exhibited an elevated separation index (SI), suggesting a sensitivity to modification conditions; (4) evaluation using the MSCR method indicated that % rec with a 3.2 kPa load is effective for the sensitive assessment of binder storage stability and Jnr showed a limited sensitivity across varying loads, advocating for % rec for precise evaluation; and (5) despite permitting various tests, achieving consistent results remains challenging. Future research should explore diverse modifiers and optimal evaluation methods to enhance knowledge of binder behavior and separation dynamics.

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Laboratory Evaluation of Storage Stability for CRM Asphalt Binders

Cited by 9 publications

References 17 publications

Effect of Crumb Rubber Modifier Particle Size on Storage Stability of Rubberized Binders

Effect of Crumb Rubber Modifier Particle Size on Storage Stability of Rubberized Binders

Study on Vehicle–Road Interaction for Autonomous Driving

Laboratory Evaluation of Storage Stability for Asphalt Binder Modified with Crumb Rubber and Styrene–Isoprene–Styrene Depending on Evaluation Factors and Blending Condition

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