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

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

Polymers ◽

10.3390/polym11040665 ◽

2019 ◽

Vol 11 (4) ◽

pp. 665 ◽

Cited By ~ 7

Author(s):

Meizhao Han ◽

Xiang Zeng ◽

Yaseen Muhammad ◽

Jing Li ◽

Jing Yang ◽

...

Keyword(s):

Loss Modulus ◽

Creep Recovery ◽

Rubber Powder ◽

Modified Asphalt ◽

Grafting Reaction ◽

Waste Rubber ◽

Covalent Grafting ◽

Waste Rubber Powder ◽

Sbs Modified Asphalt ◽

Octadecyl Amine

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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Evaluation of VOCs inhibited effects and rheological properties of asphalt with high-content waste rubber powder

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.124320 ◽

2021 ◽

Vol 300 ◽

pp. 124320

Author(s):

Jianwei Zhang ◽

Meizhu Chen ◽

Shaopeng Wu ◽

Xinxing Zhou ◽

Guangyuan Zhao ◽

...

Keyword(s):

Rheological Properties ◽

Rubber Powder ◽

Waste Rubber ◽

Waste Rubber Powder

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Investigation on Rheological Properties and Storage Stability of Modified Asphalt Based on the Grafting Activation of Crumb Rubber

Polymers ◽

10.3390/polym11101563 ◽

2019 ◽

Vol 11 (10) ◽

pp. 1563 ◽

Cited By ~ 6

Author(s):

Xie ◽

Yang ◽

Lv ◽

Zhang ◽

Zhu ◽

...

Keyword(s):

Rheological Properties ◽

Storage Stability ◽

Crumb Rubber ◽

Modified Asphalt ◽

Rubber Particles ◽

Polymer Separation ◽

Low Temperature Creep ◽

Rheological Test ◽

And Storage ◽

Separation Test

Acrylamide with a double bond and amide group can not only copolymerize with macromolecules of crumb rubber but also react with acidic groups in asphalt, so it was selected as a modifier to activate crumb rubber through chemical graft action. The purpose is to improve the compatibility between crumb rubber and asphalt and thus improve the rheological properties and storage stability of rubber asphalt. Infrared spectroscopy (IR) and scanning electron microscopy (SEM) were used to characterize the crumb rubbers and their modified asphalt. It was found that the crumb rubber of grafting acrylamide had better compatibility in asphalt due to its larger specific surface area and chemical reaction with asphalt. In addition, the high temperature rheological test, low temperature creep test, and polymer separation test were carried out to study the effect of grafted activated crumb rubber on the properties of modified asphalt. The results showed that compared with modified asphalt with common crumb rubber (CRMA), the rheological properties and storage stability of modified asphalt with grafting activated crumb rubber (A–G–R) were improved significantly. The results of microscopic and macroscopic tests show that the activated rubber particles have a larger contact area with asphalt due to a rougher surface and the chemical cross-linking between rubber particles and asphalt further strengthens their interaction. Therefore, there is a relatively stable blend system formed in modified asphalt, and its performance of modified asphalt has been improved.

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