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Jingyao Yang
School of Transportation, Southeast University, Nanjing 211189, China

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Journal article
Published: 19 August 2021 in Materials
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The purpose of this research was to make full use of waste lubricating by-products (LBP) and reclaimed rubber powder (RR) to modify asphalt by a one-pot approach, so as to achieve the dual purpose of solving the poor storage stability of reclaimed rubber powder modified asphalt (RRMA) and the realization of solid waste recycling. A variety of characterization techniques were performed to analyze storage stability, conventional properties and microstructure of LBP-activated reclaimed rubber powder modified asphalt (Blend). Fourier transform infrared spectroscopy illustrated that not only the chemical composition of LBP was very similar to that of asphalt, but also the activation of LBP improved the compatibility of RR with asphalt and enhanced the storage stability of Blend. Fluorescence spectrum and scanning electron microscopy results indicated that the RR without LBP activation was aggregated and dispersed as blocks in asphalt, while the LBP activated RR was uniformly dispersed in the asphalt phase. The segregation test demonstrated that Blend exhibited outstanding storage stability, in which the softening point difference was within 2.5 °C and the segregation rate was −0.2–0.2. In addition, the conventional properties of Blend have been significantly improved, especially in penetration and ductility. More importantly, the short-term aging results demonstrated that, compared with RRMA, Blend possessed excellent anti-aging performance.

ACS Style

Peipei Kong; Gang Xu; Jingyao Yang; Xianhua Chen; Yaqin Zhu. Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt. Materials 2021, 14, 4684 .

AMA Style

Peipei Kong, Gang Xu, Jingyao Yang, Xianhua Chen, Yaqin Zhu. Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt. Materials. 2021; 14 (16):4684.

Chicago/Turabian Style

Peipei Kong; Gang Xu; Jingyao Yang; Xianhua Chen; Yaqin Zhu. 2021. "Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt." Materials 14, no. 16: 4684.

Journal article
Published: 06 July 2021 in Materials
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With the growing interest in bituminous construction materials, desulfurized crumb rubber (CR)/styrene–butadiene–styrene (SBS) modified asphalts have been investigated by many researchers as low-cost environmental-friendly road construction materials. This study aimed to investigate the rheological properties of desulfurized CR/SBS composite modified asphalt within various temperature ranges. Bending beam rheometer (BBR), linear amplitude sweep (LAS), and multiple stress creep recovery (MSCR) tests were performed on conventional CR/SBS composite modified asphalt and five types of desulfurized CR/SBS modified asphalts. Meanwhile, Burgers’ model and the Kelvin–Voigt model were used to derive nonlinear viscoelastic parameters and analyze the viscoelastic mechanical behavior of the asphalts. The experimental results indicate that both the desulfurized CR/SBS composite modifier and force chemical reactor technique can enhance the crosslinking of CR and SBS copolymer, resulting in an improved high-, intermediate-, and low-temperature performance of desulfurized CR/SBS composite modified asphalt. Burgers’ model was found to be apposite in simulating the creep stages obtained from MSCR tests for CR/SBS composite modified asphalts. The superior high-temperature performance of desulfurized CR/SBS modified asphalt prepared with 4% SBS, 20% desulfurized rubber, and a force chemical reactor time of 45 min contributes to the good high-temperature elastic properties of the asphalt. Therefore, this combination is recommended as an optimal preparation process. In summary, the desulfurization of crumb rubber and using the force chemical reactor technique are beneficial to composite asphalt performance and can provide a new way of utilizing waste tire rubber.

ACS Style

Jingyao Yang; Gang Xu; Peipei Kong; Xianhua Chen. Characterization of Desulfurized Crumb Rubber/Styrene–Butadiene–Styrene Composite Modified Asphalt Based on Rheological Properties. Materials 2021, 14, 3780 .

AMA Style

Jingyao Yang, Gang Xu, Peipei Kong, Xianhua Chen. Characterization of Desulfurized Crumb Rubber/Styrene–Butadiene–Styrene Composite Modified Asphalt Based on Rheological Properties. Materials. 2021; 14 (14):3780.

Chicago/Turabian Style

Jingyao Yang; Gang Xu; Peipei Kong; Xianhua Chen. 2021. "Characterization of Desulfurized Crumb Rubber/Styrene–Butadiene–Styrene Composite Modified Asphalt Based on Rheological Properties." Materials 14, no. 14: 3780.