Preparation of Octadecyl Amine Grafted over Waste Rubber Powder (ODA-WRP) and Properties of Its Incorporation in SBS-Modified Asphalt

Through a covalent grafting reaction, octadecyl amine (ODA) was grafted on the surface of waste rubber powder (WRP) to obtain an ODA-WRP modifier, which was in turn compounded with a styrene-butadiene-styrene block copolymer (SBS) to prepare ODA-WRP/SBS-modified asphalt. The three major indicators (i.e., dynamic shear rheometer (DSR), multi-stress creep recovery (MSCR), and separation tests) showed that 1-ODA-WRP effectively improved the complex shear modulus (G*), elastic Modulus (G′), and loss modulus (G″) by 36.47%, 40.57%, and 34.77% (64 °C and 10 Hz), respectively, as compared to pristine SBS-modified asphalt. Fluorescence microscopy (FM) results concluded that the enhancement in mechanical properties was accredited to the better compatibility of various components in asphalt and establishment of network structure between ODA-WRP and SBS in ODA-WRP/SBS-modified asphalt. Fourier infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) analyses confirmed the successful synthesis of ODA-WRP. This study could be of great help in synthesizing ODA-WRP asphalt modified with SBS for highways and construction applications.

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Properties of polystyrene grafted activated waste rubber powder (PS-ARP) composite SBS modified asphalt

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.117737 ◽

2020 ◽

Vol 238 ◽

pp. 117737 ◽

Cited By ~ 2

Author(s):

Binqing Liu ◽

Jing Li ◽

Meizhao Han ◽

Zhengqi Zhang ◽

Xinyue Jiang

Keyword(s):

Rubber Powder ◽

Modified Asphalt ◽

Waste Rubber ◽

Waste Rubber Powder ◽

Sbs Modified Asphalt

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Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder

Materials ◽

10.3390/ma14102693 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2693

Author(s):

Weihong Liu ◽

Yishen Xu ◽

Hongjun Wang ◽

Benan Shu ◽

Diego Maria Barbieri ◽

...

Keyword(s):

Rheological Properties ◽

Large Scale ◽

Storage Stability ◽

Chemical Activation ◽

Crumb Rubber ◽

Rubber Powder ◽

Modified Asphalt ◽

Waste Rubber ◽

Waste Rubber Powder ◽

Physical And Chemical

Segregation of waste crumb rubber powder (WR) modified asphalt binders the large-scale application of WR in asphalt. The method of microwave activation combined with chemical activation (KMWR) was proposed to improve storage stability and rheological properties of WR modified asphalt in this work. Storage stability and rheological properties of virgin asphalt, MWR modified asphalt, and KMWR modified asphalt were comparatively studied by the standard segregation test, bending beam rheometer (BBR) test, and dynamic shear rheometer (DSR) test. The effect of composite activation on waste rubber powder particles was studied by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and Brunauer–Emmett–Teller (BET) tests. The main results showed that after the physical and chemical composite activation, the storage stability of waste rubber powder modified asphalt was significantly improved, WR modified asphalt had better crack resistance, better rutting resistance, and better fatigue performance. After physical and chemical activation, WR was desulfurized, and a large number of active groups was grafted on the WR particles.

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