Low-Temperature and Fatigue Characteristics of Degraded Crumb Rubber–Modified Bitumen Before and After Aging

Wang, Sheng; Huang, Weidong; Lin, Peng

doi:10.1061/(asce)mt.1943-5533.0004131

Cited by 13 publications

(4 citation statements)

References 38 publications

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“…The technology of environmentally modifying asphalt with DR can save the production time of rubber asphalt and greatly avoid segregation, reduce emissions and lower the asphalt-to-aggregate ratio, with a similar preparation condition to the mature process of SBS-modified asphalt. And the obtained DRMA shows improved properties as reported [ 39 ].…”

Section: Sustainability Of Rubberized Asphaltsupporting

confidence: 69%

“…Afterward, terminal blend mixing technology arose in America. This process degraded GTR into small-molecule polymers in asphalt at high temperature, high speed and long-time shearing, thus improving storage stability and workability [ 37 , 38 , 39 ]. It was found that DR with micro-nano size could mix asphalt more quickly and completely.…”

Section: Mixing Mechanism Of Dr With Asphaltmentioning

confidence: 99%

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Characterization, Properties and Mixing Mechanism of Rubber Asphalt Colloid for Sustainable Infrastructure

et al. 2022

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Rubber asphalt has always been considered to have the most potential for the disposal of waste tires as sustainable infrastructure. However, the covalently cross-linked tire rubber presents an extreme challenge in reusing waste rubbers in roads. Rubberized asphalt with finely dispersed or colloidal structure has been regarded as a potential binder used as road material because of the improved properties in terms of storage stability, easy processing and high content of incorporation. However, the mixing mechanism between the finely dispersed rubber on micro-nano scale with asphalt is still not clear, which restricts its further development as value-added material. Devulcanized rubber (DR) was introduced to improve the compatibility between asphalt and rubber. The basic chemicals of DR and asphalt were introduced based on their structures. Furthermore, the interactions between DR and asphalt were discussed according to the functional elements at different levels, and the concept of DR as “the fifth component” of asphalt was put forward. Finally, high performance, environmental and economic effects and applications of devulcanized-rubber-modified asphalt (DRMA) were discussed. The review is expected to provide a guide for the wide application of DRMA, which is still restricted by poor compatibility and bad stability during processing, storage and recycling.

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Section: Sustainability Of Rubberized Asphaltsupporting

confidence: 69%

Section: Mixing Mechanism Of Dr With Asphaltmentioning

confidence: 99%

Characterization, Properties and Mixing Mechanism of Rubber Asphalt Colloid for Sustainable Infrastructure

et al. 2022

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“…Sulfur is provided by Shenzhen Keda Trading Co., Ltd. (Shenzhen, China) with a melting point of 115 • C, a boiling point of 445 • C, and an ash content of 0.032%. The preparation of TBRB was prepared by a hightemperature curing method to assure the degradation of CRs [23,24]. TB hybrid bitumen (TBHB) is made of TBRB and sulfur.…”

Section: Methodsmentioning

confidence: 99%

Aging Characteristics of Rubber Modified Bitumen Mixed with Sulfur after Terminal Blend Process

et al. 2022

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The influence of sulfur on the chemical, rheological, and aging resistance of terminal blend rubberized bitumen (TBRB) was studied. TB hybrid bitumen (TBHB) was prepared from with different sulfur contents (0.1, 0.2, 0.3, 0.4 wt%) and TBRB prepared with neat bitumen and crumb rubbers at 20% content. TBHB binders were aged by rolling thin film oven test (RTFOT) and pressure aging vessel (PAV), respectively. The chemical composition of TBHB binders was monitored by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). Rheological properties of all TBHB samples were tested. Chemical composition results show that TBHB can inhibit the degradation of polybutadiene compared with TBRB in the RTFOT stage, and the polybutadiene degradation is the main process of TBHB in the RTFOT stage, while the TBHB is mainly desulfurized after PAV aging. Meanwhile, the increase in sulfur content in the TBHB can improve the desulfurization degree of the TBHB binder after PAV. TBRB containing sulfur can improve the mechanical properties and elasticity and reduce the hardening degree during aging. Moreover, blending sulfur into the TBRB caused a lower complex modulus aging index after aging, which indicates that TBHB has superior aging resistance.

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“…Many studies have used composite modification techniques to improve the overall performance of RMB by incorporating other types of modifiers into RMB [11][12][13][14]. Jiang et al found that the temperature sensitivity of the bitumen was improved and its bituminous pavement noise reduction performance was excellent after the composite modification of CR and styrene-butadiene-styrene (SBS) [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of High Content of Waste Tire Rubber and Sulfur on the Aging Behavior of Bitumen

et al. 2022

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High content rubber modified bitumen (HCRMB) prepared from the high content of waste tire rubber and bitumen has good performance while allowing greater use of the waste tires. However, HCRMB is subject to aging during use, which can affect its performance. The purpose of this paper was to investigate the effect of high content of waste tire rubber and sulfur on the aging behavior of bitumen. The properties of all bitumen were tested using rolling thin film oven aging (RTFOT) test, pressure aging vessel (PAV) test, frequency sweep tests, temperature sweep (TS) test, multiple stress creep recovery (MSCR) test, and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) test. Test results show that the addition of sulfur to HCRMB leads to an improvement in the elasticity of HCRMB. The elasticity of HCRMB with different amounts of sulfur increases with aging. In addition, the increase in the amount of sulfur can improve the RTFOT aging resistance and the PAV aging resistance of HCRMB. Sulfur cannot reduce the degree of oxidation of HCRMB after aging, but can inhibit the degree of desulfurization of HCRMB. Furthermore, the aging process of HCRMB with different amounts of sulfur is dominated by the degradation of polybutadiene.

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Low-Temperature and Fatigue Characteristics of Degraded Crumb Rubber–Modified Bitumen Before and After Aging

Cited by 13 publications

References 38 publications

Characterization, Properties and Mixing Mechanism of Rubber Asphalt Colloid for Sustainable Infrastructure

Characterization, Properties and Mixing Mechanism of Rubber Asphalt Colloid for Sustainable Infrastructure

Aging Characteristics of Rubber Modified Bitumen Mixed with Sulfur after Terminal Blend Process

Effect of High Content of Waste Tire Rubber and Sulfur on the Aging Behavior of Bitumen

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