scholarly journals Exploring the Possibility of Using Ionic Copolymer Poly (Ethylene-co-Methacrylic) Acid as Modifier and Self-Healing Agent in Asphalt Binder and Mixture

2020 ◽  
Vol 10 (2) ◽  
pp. 426
Author(s):  
Yuefeng Zhu ◽  
Reyhaneh Rahbar-Rastegar ◽  
Yanwei Li ◽  
Yaning Qiao ◽  
Chundi Si
Keyword(s):  
Methacrylic Acid ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Self Healing ◽  
Cracking Resistance ◽  
Poly Ethylene ◽  
Copolymer Poly ◽  
Ionic Copolymer

It is well-accepted that the ionic copolymer poly (ethylene-co-methacrylic) acid (also named EMAA) is one type of self-healing material. This particular capability has great potential for extending the service life of infrastructures. In order to improve the rheological, mechanical, and self-healing properties of asphalt binder and asphalt mixtures, EMAA and styrene butadiene rubber (SBR) were selected as the additives. In this study, the effects of EMAA and SBR on the performance of bitumen and asphalt mixtures were examined and characterized using various parameters including rheological indices, Glover–Rowe parameter, ductility self-healing rate, fluorescence microscopy, and scanning electron microscope (SEM) test on binders, and different testing methods such as complex modulus, thermal stress-restrained specimen test (TSRST), disk-shaped compact tension (DCT), and fatigue–healing–fatigue test on the mixtures. The results showed that EMAA can significantly improve the stiffness and self-healing capacity of virgin and SBR modified binders and mixtures. Moreover, the cracking resistance of EMAA/SBR compound modified binder and mixture showed a significant improvement. However, EMAA is not recommended to be added as a modifier to virgin binders and mixtures due to its poor cracking resistance. Some novel tests and parameters mentioned in this paper are recommended for characterizing binders and mixtures in the future.

scholarly journals An Experimental Investigation into the Effect of Asphalt Binder Modified with SBR Polymer on the Moisture Susceptibility of Asphalt Mixtures

2021 ◽  
Author(s):  
Gholam Hossein Hamedi ◽  
Ali Sahraei ◽  
Mohammad Hadizadeh Pirbasti
Keyword(s):  
Free Energy ◽  
Thermodynamic Parameters ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Loading Test ◽  
Dry Conditions ◽  
Repetitive Loading ◽  
Styrene Butadiene

There are several experimental methods for improving the moisture strength of asphalt mixtures. Utilization of anti-stripping materials is the most prevalent method. In the present paper, the influence of polymer materials on asphalt binder was investigated using repetitive loading test in wet and dry conditions along with thermodynamic parameters based on the Surface Free Energy components of asphalt binder and aggregates. The results obtained from the present study indicated that using Styrene Butadiene Rubber polymer has improved the asphalt mixtures strength against the moisture damage, especially in the specimens made of granite aggregates. Also, Styrene Butadiene Rubber polymer increased the cohesion free energy and reduced the energy released by the system during the stripping event, which represented a decrease in the tendency for stripping. The stripping percentage index, which is obtained by a combination of the results of the repetitive loading test in wet and dry conditions along with the results of thermodynamic parameters, represented that the specimens made of controlled asphalt binder in the loading cycles under wet conditions had a higher stripping rate. It was also concluded that the modulus loss rate in the control asphalt mixtures was faster than the modified specimens.

scholarly journals Effect of Phenolic Resin on the Rheological and Morphological Characteristics of Styrene-Butadiene Rubber-Modified Asphalt

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5836
Author(s):  
Peifeng Cheng ◽  
Yiming Li ◽  
Zhanming Zhang
Keyword(s):  
Phenolic Resin ◽  
Asphalt Binder ◽  
Morphological Characteristics ◽  
Chemical System ◽  
Temperature Deformation ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Modified Asphalt ◽  
Styrene Butadiene ◽  
Rheological Performance

To improve the thermal-aging stability and rheological performance of styrene–butadiene rubber (SBR)-modified asphalt, phenolic resin (PF) was introduced in the process of preparing SBR-modified asphalt by melt blending. The effect of PF and SBR on the high and low-temperature rheological performance of the asphalt binder before and after aging was evaluated by a temperature and frequency sweep using a dynamic shear rheometer (DSR). Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), and fluorescence microscopy (FM) were used to further investigate the effect of PF and SBR on the thermal stability and morphological characteristics of the asphalt binder. The results showed that the addition of PF can enhance the high-temperature deformation resistance and short-term aging resistance of SBR-modified asphalt. Moreover, PF and SBR form an embedded network structure within the asphalt binder and alleviate the deterioration of the polymer during the aging process. Compared with SBR-modified asphalt, the chemical system of composite-modified asphalt is more stable, and it can remain stable with an aging time of less than 5 h.

CROSSLINKING OF SBR COMPOUNDS FOR TIRE TREAD USING BENZOCYCLOBUTENE CHEMISTRY

2019 ◽  
Vol 92 (1) ◽  
pp. 25-42 ◽  
Author(s):  
Akshata Kulkarni ◽  
Coleen Pugh ◽  
Sadhan C. Jana ◽  
Darnell T. Wims ◽  
Ammar Abdel Gawad
Keyword(s):  
Crack Growth ◽  
Abrasion Resistance ◽  
Crack Growth Resistance ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Self Healing ◽  
Styrene Butadiene

ABSTRACT This research investigates the potential of benzocyclobutene (BCB) chemistry for crosslinking styrene-butadiene rubber in conjunction with sulfur curatives with the objective of achieving curing at lower temperatures and/or in shorter times compared with entirely sulfur-based cure formulations. The reversible polysulfidic linkages produced in sulfur crosslinking allow self-healing characteristics but suffer from poor heat-aging stability. The C–C crosslinks from BCB chemistry are irreversible and offer higher resistance to aging, but they do not present apparent self-healing properties. The hybrid curative package based on C–C, C–S, and S–S linkages developed is expected to provide reduced crosslinking time and/or temperature, along with higher crack-growth resistance, the ability to self-heal, higher resistance to fatigue-to-failure, reduced hysteresis, and increased abrasion resistance. The crosslinking performance of 1-substituted BCB-based compounds in conjunction with sulfur is specifically investigated.

scholarly journals Laboratory Evaluation on Performance of Fiber-Modified Asphalt Mixtures Containing High Percentage of RAP

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yuefeng Zhu ◽  
Yanwei Li ◽  
Chundi Si ◽  
Xiaote Shi ◽  
Yaning Qiao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Asphalt Binder ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Self Healing ◽  
Test Results ◽  
Moisture Susceptibility ◽  
Modified Asphalt ◽  
Modified Binders ◽  
Different Types

In recent years, the significant demand for sustainable paving materials has led to a rapid increase in the utilization of reclaimed asphalt pavement (RAP) materials. When RAP is mixed with virgin asphalt concrete, particularly when its percentage is high, performance of the binder and asphalt concrete can be adversely affected. For this reason, different types of additives need to be identified and evaluated beforehand to mitigate the adverse effects. In this study, different types of fiber materials were identified and selected as binder/mixture additives, including lignin fiber (LF), polyester fiber (PF), and basalt fiber (BF). Various samples of fiber-modified binders and asphalt mixtures with different RAP contents (0%, 20%, and 40%) were prepared and were evaluated using two sets of laboratory testing: (i) dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests were performed to study the rheological properties of fiber-modified binders; (ii) the wheel tracking test, bending creep test, moisture susceptibility test, fatigue test, and self-healing fatigue test were conducted to characterize the laboratory properties of fiber-modified RAP mixtures. Test results for the modified binders show that the BF-modified binder has the greatest positive effect on the high-temperature performance of the asphalt binder, followed by PF- and LF-modified binders. However, the virgin asphalt shows the best low-temperature property than the fiber-modified asphalt binder. Test results for the whole RAP mixtures show that all fibers have a significant effect on the properties (including high- and low-temperature stability, moisture susceptibility, fatigue, and self-healing ability) of RAP mixtures. Among them, adding BF shows the greatest improvement in high-temperature stability, fatigue resistance, and self-healing ability of RAP mixtures. LF is found to significantly enhance low-temperature properties, and PF can greatly improve the resistance to moisture damage of RAP mixtures. For high percentage of RAP using on sites, adding multiple additives may further enhance its durability.

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