Workability and mechanical property characterization of asphalt rubber mixtures modified with various warm mix asphalt additives

Yu, Han; Leng, Zhen; Zhang, Dong; Tan, Zhifei; Guo, Feng; Yan, Jinhai

doi:10.1016/j.conbuildmat.2018.04.218

Cited by 121 publications

(53 citation statements)

References 21 publications

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“…For asphalt mixture preparation, Stone Mastic Asphalt 10 (SMA10) gradation commonly applied in South China was used. Detail information of gradation can be found in another publication of the corresponding author [13]. The mixing temperatures were set as 176 • C for AR mixtures and 160 • C for WAR mixtures, and the compacting temperatures were approximately 15 • C lower.…”

Section: Mixturementioning

confidence: 99%

“…A linear relationship between log (cycles to failure) and log (microstrain, ξ) can be obtained using the data of the ITFT results, as illustrated in Figure 6. According to previous research, the tensile strains generated under a standard axle load at the bottom of the asphalt layer always ranges from 0 and 200 microstrains [13]. To analyze the ITFT results, two microstrain values (100 and 200) were considered in this research, representing the normal and high strain levels, respectively.…”

Section: Itftmentioning

confidence: 99%

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Fatigue Resistance Characterization of Warm Asphalt Rubber by Multiple Approaches

Gao

et al. 2018

Applied Sciences

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Warm asphalt rubber (WAR) mixture is a sustainable paving material with advantages including waste recycling and noise reducing. A comprehensive understanding of the fatigue performance of WAR specimens is helpful to its wide application. However, research on evaluating the fatigue performance of WAR binder and mixtures is very limited. This paper applies five fatigue analysis approaches to evaluate the fatigue life of WAR samples with three different warm mix asphalt (WMA) additives. The conventional G*sinδ, linear amplitude sweep (LAS), indirect tensile fatigue test (ITFT), and four-point bending beam (4PB) test were conducted based on available standards. In addition, a novel shear fatigue test was performed on WAR mortars. Test results indicated that the incorporation of crumb rubber has a significantly positive effect on fatigue resistance. WAR with chemical and foaming additives exhibited a poorer performance than asphalt rubber (AR), but their fatigue performance was still greatly superior to the non-rubberized samples. Finally, LAS as well as mortar shear fatigue and 4PB tests provided the same prediction of fatigue resistance, while the results of G*sinδ and the ITFT were inconsistent. It is recommended to use LAS, the mortar shear fatigue test, and the 4PB test for the fatigue resistance evaluation of rubberized specimens. The validation of the findings with more materials and field performances is recommended.

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Section: Mixturementioning

confidence: 99%

Section: Itftmentioning

confidence: 99%

Fatigue Resistance Characterization of Warm Asphalt Rubber by Multiple Approaches

Gao

et al. 2018

Applied Sciences

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“…Asphalt modification technology has been considered a practical approach to resolve these concerns by enhancing the durability of asphalt pavements. Crumb rubber (CRM), styrene-butadiene-rubber (SBR) and styrene-butadiene-styrene (SBS) are the three most widely applied modifiers, which are regarded as effective adhesive and cohesive performance enhancers of asphalt [5][6][7][8][9]. However, the storage stability concern of modified asphalt has limited its widespread application.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification

Ren

Zhu

Wu³

et al. 2020

Nanomaterials

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The storage stability concern, caused by phase separation for the density difference between polymers and asphalt fractions, has limited the widespread application of polymer modified asphalt (PMA). Therefore, this study aims to improve the storage concern of PMA by incorporating nano-montmorillonite. To this end, different nano-montmorillonites were incorporated to three PMAs modified with three typical asphalt modifiers, i.e., crumb rubber (CRM), styrene–butadiene-rubber (SBR) and styrene–butadiene-styrene (SBS). A series of laboratory tests were performed to evaluate the storage stability and rheological properties of PMA binders with nano-montmorillonite. As a consequence, the incorporation of nano-montmorillonite exhibited a remarkable effect on enhancing the storage stability of the CRM modified binder, but limited positive effects for the SBR and SBS modified binders. The layered nano-montmorillonite transformed to intercalated or exfoliated structures after interaction with asphalt fractions, providing superior storage stability. Among selected nano-montmorillonites, the pure montmorillonite with Hydroxyl organic ammonium performed the best on enhancing storage stability of PMA. This paper suggests that nano-montmorillonite is a promising modifier to alleviate the storage stability concern for asphalt with polymer modifiers.

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“…Akisetty et al also admitted the same tolerance regarding the air void content [17], which also obtained a reduction of 30 • C in a dense-graded mixture with CRM and a wax, using a gyratory compactor. Other investigations have compared the results obtained by Marshall and gyratory compaction in SMA mixtures with CRM incorporating waxes or chemical additives [18,19]. The tests were performed for compaction temperatures of 160 and 144 • C. They observed that the rotating compaction allowed for a better distinction between the different additives and temperatures.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Warm Rubberized Stone Mastic Asphalt Mixtures through the Marshall and Gyratory Compactors

2020

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Stone mastic asphalt (SMA) mixtures exhibit excellent behaviour; they are highly resistant to reflective cracking and permanent deformation, as well as providing the wearing surface with an optimal texture. However, the production and compaction temperatures are similar to conventional mixtures, which means that there is a significant consumption of energy, as well as greenhouse gas emissions. Warm mix asphalt (WMA) technology, which has been developed over the last few years, might allow lower temperatures without compromising the mechanical behaviour of the mixtures. Also, over the last few decades, rubberized asphalt has proved to be effective in improving the performance and being environmentally suitable, but it requires higher production temperatures than conventional mixtures. In this study, several tests were performed to evaluate the effect of a chemical WMA additive on the compactability and water sensitivity of rubberized SMA mixtures with both the Marshall and the gyratory compactor. The investigation has shown that the gyratory compactor is more suitable for studying compactability and the water sensitivity of rubberized SMA with WMA additives.

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Workability and mechanical property characterization of asphalt rubber mixtures modified with various warm mix asphalt additives

Cited by 121 publications

References 21 publications

Fatigue Resistance Characterization of Warm Asphalt Rubber by Multiple Approaches

Fatigue Resistance Characterization of Warm Asphalt Rubber by Multiple Approaches

Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification

Evaluation of Warm Rubberized Stone Mastic Asphalt Mixtures through the Marshall and Gyratory Compactors

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