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

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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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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Rheological Properties, Compatibility, and Storage Stability of SBS Latex-Modified Asphalt

Materials ◽

10.3390/ma12223683 ◽

2019 ◽

Vol 12 (22) ◽

pp. 3683 ◽

Cited By ~ 3

Author(s):

Shisong Ren ◽

Xueyan Liu ◽

Weiyu Fan ◽

Haopeng Wang ◽

Sandra Erkens

Keyword(s):

Rheological Properties ◽

Flow Resistance ◽

Storage Stability ◽

Elastic Recovery ◽

Steady State Flow ◽

Modified Asphalt ◽

Asphalt Modification ◽

Styrene Butadiene ◽

And Storage ◽

Butadiene Styrene

A styrene-butadiene-styrene (SBS) latex modifier can be used for asphalt modification due to the fact of its energy-saving, construction convenience, and economic advantages. The objective of this study was to investigate the influence of asphalt type and SBS latex dosage on the rheological properties, compatibility, and storage stability of asphalt through temperature and frequency sweep, steady-state flow, multiple stress creep and recovery (MSCR) tests, Cole-Cole plots and thermal storage tests. The results indicated that high SBS latex content is beneficial for improving anti-rutting, anti-fatigue, viscous flow resistance, and elastic recovery abilities of modified asphalt. The chemical composition of asphalt had a significant effect on the properties of the SBS latex-modified asphalt. High asphaltenes and low resins were favorable to enhancing anti-rutting and recovery properties but weakened the anti-fatigue, compatibility, and storage stability of modified asphalt. Furthermore, compared to SBS particle-modified asphalt, SBS latex-modified asphalt had greater rutting and fatigue resistance. However, SBS latex-modified asphalt had some disadvantages in compatibility and storage stability. Comprehensively considering the balance of viscoelastic properties, compatibility, and storage stability of SBS latex-modified asphalt, the mixing dosage of SBS latex modifier is recommended at 4.0 wt% which could feasibly replace SBS particle in asphalt modification.

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Investigation of the rheological properties and storage stability of CR/SBS modified asphalt

Construction and Building Materials ◽

10.1016/j.conbuildmat.2014.10.022 ◽

2015 ◽

Vol 74 ◽

pp. 235-240 ◽

Cited By ~ 62

Author(s):

Ming Liang ◽

Xue Xin ◽

Weiyu Fan ◽

Hui Luo ◽

Xiaobo Wang ◽

...

Keyword(s):

Rheological Properties ◽

Storage Stability ◽

Modified Asphalt ◽

Sbs Modified Asphalt ◽

And Storage

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Asphalt Incorporation with Ethylene Vinyl Acetate (EVA) Copolymer and Natural Rubber (NR) Thermoplastic Vulcanizates (TPVs): Effects of TPV Gel Content on Physical and Rheological Properties

Polymers ◽

10.3390/polym13091397 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1397

Author(s):

Nappaphan Kunanusont ◽

Boonchai Sangpetngam ◽

Anongnat Somwangthanaroj

Keyword(s):

Storage Stability ◽

Ethylene Vinyl Acetate ◽

Softening Temperature ◽

Plastic Waste ◽

Gel Content ◽

Modified Asphalt ◽

C Storage ◽

Thermoplastic Vulcanizates ◽

Polymer Modified Asphalt ◽

And Storage

Plastic waste has been incorporated with asphalt to improve the physical properties of asphalt and alleviate the increasing trend of plastic waste being introduced into the environment. However, plastic waste comes in different types such as thermoplastic or thermoset, which results in varied properties of polymer modified asphalt (PMA). In this work, four thermoplastic vulcanizates (TPVs) were prepared using different peroxide concentrations to produce four formulations of gel content (with varying extent of crosslinked part) in order to imitate the variation of plastic waste. All four TPVs were then mixed with asphalt at 5 wt% thus producing four formulations of PMA, which went through physical, rheological, and storage stability assessments. PMA with higher gel content possessed lower penetration and higher softening temperature, indicating physically harder appearance of PMA. Superpave parameters remained unchanged among different gel content PMA at temperatures of 64, 70, and 76 °C. PMA with any level of gel content had lower Brookfield viscosity than PMA without gel content at a temperature of 135 °C. Higher gel content resulted in shorter storage stability measured with greater different softening temperatures between top and bottom layers of PMA after 5 days of 163 °C storage. This study shows that asphalt with thermoset plastic waste is harder and easier to pave, thus making the non-recycling thermoset plastic waste more useful and friendly to the environment.

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Rubber Modified Asphalt Storage Stabilizer Option

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.311-313.1136 ◽

2011 ◽

Vol 311-313 ◽

pp. 1136-1139

Author(s):

Zhong He Chen ◽

Zheng Qian Zhang ◽

Hua Lin Luo ◽

Ning Ning Dong

Keyword(s):

Storage Stability ◽

Experimental Methods ◽

Modified Asphalt ◽

The Poor ◽

Different Types ◽

And Storage ◽

Different Doses

In order to improve the poor compatibility and storage stability of rubber modified asphalt,authors using theoretical and experimental methods, to investigate the influence of the stabilizer on the storage stability and the using performance of rubber modified asphalt, through adding the different types and different doses of stabilizer, to improve its storage stability and using performance of modified asphalt.

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