Fabrication and application of polyurea formaldehyde-bioasphalt microcapsules as a secondary modifier for the preparation of high self-healing rate SBS modified asphalt

2020 ◽  
Vol 246 ◽  
pp. 118452 ◽  
Author(s):  
Jing Li ◽  
Song Yang ◽  
Yaseen Muhammad ◽  
Maria Sahibzada ◽  
Zhaorong Zhu ◽  
...  
Keyword(s):  
Healing Rate ◽  
Self Healing ◽  
Modified Asphalt ◽  
Sbs Modified Asphalt

scholarly journals Enhancing Effect of Waste Engine Oil Bottom Incorporation on the Performance of CR+SBS Modified Bitumen: A Sustainable and Environmentally-Friendly Solution for Wastes

2021 ◽  
Vol 13 (22) ◽  
pp. 12772
Author(s):  
Changjiang Liu ◽  
Qiuping Wang
Keyword(s):  
Asphalt Binder ◽  
Engine Oil ◽  
Chemical Compositions ◽  
Self Healing ◽  
Temperature Property ◽  
Modified Bitumen ◽  
Modified Asphalt ◽  
Waste Engine Oil ◽  
Sbs Modified Asphalt ◽  
Low Temperature Property

Waste engine oil bottom (WEOB) is a hazardous waste whose effect as an additive to CR+SBS modified asphalt is rarely studied. In this study, the CR+SBS asphalt binder was modified with WEOB in different concentrations (3, 6, and 9 wt%). The GC–MS and FTIR were performed to evaluate the chemical compositions of WEOB and WEOBCR+SBS asphalt. The results showed that the main constituents of WEOB were similar to the functional groups of asphalt, along with maleic anhydride (MAH). Pavement performance-related rheological tests such as RV, temperature sweep (TS), FS, MSCR, and BBR were carried out. Results show that WEOBCR+SBS-6 exhibited the best high- and low-temperature property, followed by CR+SBS-3 and CR+SBS-9. Fluorescence microscope (FM) test, bar thin layer chromatograph (BTLC) test, FTIR, and AFM tests were carried out to evaluate the micro-morphologies and modification mechanism. The analysis revealed increased trends in resin fraction as opposed to asphaltene fraction with the increase of WEOB content. FTIR analysis revealed that the amide groups in WEOBCR+SBS asphalt bonded to the free radicals of CR. Moreover, a modification mechanism was elaborated. WEOB strengthens the cross-linked structure of CR+SBS polymers, reacting with SBS to graft onto MAH-g-SBS, and the free radical of CR interacts with the amide group in WEOB to form a bond. In addition, the content of lightweight components and surface roughness of SBS specimens were in good correlation, which contributed to the rutting resistance and adhesion and self-healing performance.

scholarly journals Zn-Co-CeO2 vs. Zn-Co Coatings: Effect of CeO2 Sol in the Enhancement of the Corrosion Performance of Electrodeposited Composite Coatings

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 704
Author(s):  
Marija Riđošić ◽  
Nebojša D. Nikolić ◽  
Asier Salicio-Paz ◽  
Eva García-Lecina ◽  
Ljiljana S. Živković ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Healing Rate ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Self Healing ◽  
Kelvin Probe ◽  
Artificial Defect ◽  
Volta Potential ◽  
Superior Corrosion Resistance ◽  
The Stability

Electrodeposition and characterization of novel ceria-doped Zn-Co composite coatings was the main goal of this research. Electrodeposited composite coatings were compared to pure Zn-Co coatings obtained under the same conditions. The effect of two ceria sources, powder and home-made sol, on the morphology and corrosion resistance of the composite coatings was determined. During the electrodeposition process the plating solution was successfully agitated in an ultrasound bath. The source of the particles was found to influence the stability and dispersity of plating solutions. The application of ceria sol resulted in an increase of the ceria content in the resulting coating and favored the refinement from cauliflower-like morphology (Zn-Co) to uniform and compact coral-like structure (Zn-Co-CeO2 sol). The corrosion resistance of the composite coatings was enhanced compared to bare Zn-Co as evidenced by electrochemical impedance spectroscopy and scanning Kelvin probe results. Zn-Co doped with ceria particles originating from ceria sol exhibited superior corrosion resistance compared to Zn-Co-CeO2 (powder) coatings. The self-healing rate of artificial defect was calculated based on measured Volta potential difference for which Zn-Co-CeO2 (sol) coatings exhibited a self-healing rate of 73.28% in a chloride-rich environment.

scholarly journals Evaluation of Properties and Micro-Characteristics of Waste Polyurethane/Styrene-Butadiene-Styrene Composite Modified Asphalt

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2249
Author(s):  
Bei Chen ◽  
Fuqiang Dong ◽  
Xin Yu ◽  
Changjiang Zheng
Keyword(s):  
Low Temperature ◽  
Performance Test ◽  
Permanent Deformation ◽  
Modified Asphalt ◽  
Basic Performance ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Sbs Modified Asphalt ◽  
And Storage ◽  
Butadiene Styrene

In order to solve the problems caused by asphalt diseases and prolong the life cycle of asphalt pavement, many studies on the properties of modified asphalt have been conducted, especially polyurethane (PU) modified asphalt. This study is to replace part of the styrene-butadiene-styrene (SBS) modifier with waste polyurethane (WP), for preparing WP/SBS composite modified asphalt, as well as exploring its properties and microstructure. On this basis, this paper studied the basic performance of WP/SBS composite modified asphalt with a conventional performance test, to analyze the high- and low-temperature rheological properties, permanent deformation resistance and storage stability of WP/SBS composite modified asphalt by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The microstructure of WP/SBS composite modified asphalt was also observed by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR), as well as the reaction between WP and asphalt. According to the results of this study, WP can replace SBS as a modifier to prepare WP/SBS composite modified asphalt with good low-temperature resistance, whose high-temperature performance will be lower than that of SBS modified asphalt. After comprehensive consideration, 4% SBS content and 15% WPU content (4 S/15 W) are determined as the suitable types of WPU/SBS composite modified asphalt.

Comparison of quantitative determination for SBS content in SBS modified asphalt

2021 ◽  
Vol 282 ◽  
pp. 122733
Author(s):  
Song Xu ◽  
Yong Fan ◽  
Zhengang Feng ◽  
Yunbin Ke ◽  
Canlin Zhang ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Modified Asphalt ◽  
Sbs Modified Asphalt

Research on the Impact of Temperature on the Softening Point of SBS Modified Asphalt

2013 ◽  
Vol 365-366 ◽  
pp. 978-982
Author(s):  
Xiao Wei Feng ◽  
De Wen Zhang
Keyword(s):  
Softening Point ◽  
Heating Temperature ◽  
Road Construction ◽  
Curing Temperature ◽  
Important Indicator ◽  
Modified Asphalt ◽  
Influence Of Temperature On ◽  
Sbs Modified Asphalt ◽  
The Impact ◽  
Initial Heating

The softening point of modified asphalt is an extremely important indicator to evaluate the high-temperature performance; its the temperature of modified asphalt sample emerging shear deformation under the action of certain shear stress according to the specific heating rate. Its found that in the actual construction and testing, different temperature conditions has a larger impact on the softening point of the modified asphalt, which has adverse affect on road construction. This paper studied and researched the influence of temperature on modified asphalt softening point indicators from the different test temperature, including packing compact temperature, scraper temperature in removal of asphalt that above test mode, standing temperature, curing temperature and initial heating temperature before test.

Study on Performance and Microstructure of SBS Modified Asphalt during Shearing Process

2012 ◽  
Vol 178-181 ◽  
pp. 1442-1447 ◽  
Author(s):  
Ai Hong Kang ◽  
Wu Hong Zhang
Keyword(s):  
Mechanical Behavior ◽  
Softening Point ◽  
Shape Factor ◽  
Good Relationship ◽  
Modified Asphalt ◽  
Average Area ◽  
Point Total ◽  
Area Percentage ◽  
Sbs Modified Asphalt ◽  
Factor G

To explore the relationships between the performances and microstructures of modified asphalt, in the tests, one kind of basic asphalt、two kinds of modifiers and four kinds of modifiers content were selected to prepare modified asphalt. The SBS modified asphalt performances such as softening point, viscosity, Rutting Factor G*/sinδ and the corresponding microstructures with different shearing time were analyzed. The results show that different modifiers have different modification effects on the asphalt，but the change trends of performances and microstructures with the modifier content and shearing time are basically the same. It is also found that there is a good relationship between microstructure and macro performance, the average area of the modifier is closely related to the softening point, total area (or area percentage) and the shape factor of the modifier are suitable to reflect the mechanical behavior of modified asphalts.

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