scholarly journals Characterization of Bitumen Modified with Pyrolytic Carbon Black from Scrap Tires

2019 ◽  
Vol 11 (6) ◽  
pp. 1631 ◽  
Author(s):  
Haopeng Wang ◽  
Guoyang Lu ◽  
Shuyin Feng ◽  
Xiaobo Wen ◽  
Jun Yang
Keyword(s):  
High Temperature ◽  
Carbon Black ◽  
Rheological Properties ◽  
Storage Stability ◽  
Pyrolytic Carbon ◽  
Scrap Tire ◽  
Modified Bitumen ◽  
Laboratory Test Results ◽  
Aging Resistance

Pyrolytic carbon black (CBp) from scrap tire pyrolysis is a potential modifier for the bitumen industry. Binders containing different contents of CBp were prepared and experimentally investigated to examine the effects of CBp on the electrical and thermal conductivity, conventional physical properties, rheological properties, high-temperature antirutting performance, aging resistance, and storage stability. Laboratory test results indicated that the incorporation of CBp effectively improves the electrothermal properties, rheological properties, high-temperature rutting resistance, and aging resistance. It also increases the viscosity and decreases the storage stability of bitumen. The study confirms that CBp-modified bitumen with proper selection of content can be a multifunctional paving material.

scholarly journals SBS Modified Bitumen with Organic Layered Double Hydroxides: Compatibility and Aging Effects on Rheological Properties

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4201
Author(s):  
Canlin Zhang ◽  
Hongjun Dong ◽  
Zhengli Yan ◽  
Meng Yu ◽  
Ting Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Rheological Properties ◽  
Layered Double Hydroxides ◽  
Storage Stability ◽  
Service Performance ◽  
Aging Effects ◽  
Modified Bitumen ◽  
High Temperature Properties ◽  
Double Hydroxides ◽  
And Storage

SBS-modified bitumen (SMB) is susceptible to aging, which seriously influences its service performance and life. In order to strengthen the anti-aging ability of SMB, triethoxyvinylsilane was designed to organically modify layered double hydroxides (LDHs) and was applied to modify SMB. The dispersibility and storage stability of LDHs in SMB were markedly enhanced after triethoxyvinylsilane organic modification, and the compatibility and storage stability of SBS in bitumen were simultaneously enhanced. Compared with SMB, the introduction of LDHs and organic LDHs (OLDHs) could ameliorate the high-temperature properties of SMB, and the thermostability of SBS in bitumen at a high temperature was also distinctly improved, especially OLDHs. After aging, due to the oxidation of molecular bitumen and the degradation of molecular SBS, SMB became hardened and brittle, and the rheological properties were significantly deteriorated, which had serious impacts on the performance of SMB. LDHs can mitigate the detriment of aging to bitumen and SBS, and the deterioration of the rheological properties of SMB is obviously alleviated. As a result of the better dispersibility and storage stability, OLDHs exerted superior reinforcement of the anti-aging ability of SMB.

SBS/Carbon Black Compounds Give Asphalts with Improved High-Temperature Storage Stability

2003 ◽  
Vol 11 (6) ◽  
pp. 477-485 ◽  
Author(s):  
Shifeng Wang ◽  
Yong Zhang ◽  
Yinxi Zhang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Carbon Black ◽  
Storage Stability ◽  
Dynamic Rheology ◽  
High Temperature Storage ◽  
Storage Behavior ◽  
Styrene Butadiene ◽  
Storage Properties ◽  
Temperature Storage

Styrene-butadiene-styrene tri-block copolymer (SBS) modified asphalts are usually unstable during high-temperature storage, which presents an obstacle to their application. In this paper, SBS modified asphalts with improved high-temperature storage stability were prepared by incorporating carbon black (CB) into the SBS compounds. The effect of CB on the high-temperature storage properties, dynamic rheology, mechanical properties (softening point, viscosity etc.) and the morphologies of the modified asphalts were studied. It was found that the ratio of SBS to CB in the compound had a great effect on the high-temperature storage behavior. The modified asphalts were stable when the ratio of SBS/CB was around 2. CB had almost no effect on the dynamic rheology or the mechanical properties of the modified asphalts. The improvement in high-temperature storage behavior could be caused by decreasing the density difference and improving the compatibility between SBS and asphalt.

Physical and High-Temperature Rheological Properties of PHEMA-Modified Bitumen

2020 ◽  
Vol 32 (3) ◽  
pp. 04020010 ◽  
Author(s):  
Alireza Khavandi Khiavi ◽  
Ali Ghanbari ◽  
Ebrahim Ahmadi
Keyword(s):  
High Temperature ◽  
Rheological Properties ◽  
Modified Bitumen

THE INFLUENCE OF POLYMER ON RHEOLOGICAL AND THERMO OXIDATIVE AGING PROPERTIES OF MODIFIED BITUMEN BINDERS

2017 ◽  
Vol 79 (6) ◽  
Author(s):  
Nura Bala ◽  
Ibrahim Kamaruddin ◽  
Madzlan Napiah
Keyword(s):  
Softening Point ◽  
Storage Stability ◽  
Elastic Behavior ◽  
Modified Bitumen ◽  
Oxidative Aging ◽  
Modified Binders ◽  
Aging Resistance ◽  
Lower Temperature ◽  
Modified Binder ◽  
Temperature Susceptibility

Polymer modified bitumen (PMB) has been used for many years to improve the performance of asphalt concretes against premature pavement defects. In this research, modified samples were prepared with 2%, 3%, 4%, 5% and 6% Linear Low Density Polyethylene (LLDPE) polymer by weight of bitumen binder. The influence of LLDPE polymer was evaluated through binder properties test which includes penetration, softening point, storage stability, temperature susceptibility, rutting, fatigue and thermal oxidative aging resistance from a dynamic shear rheometer (DSR) measurements at a temperature of 20 OC to 60 OC. Results show that LLDPE polymer has a significant effect on binder properties. Penetration decreases and softening point increases with increasing LLDPE content on the modified binder after aging, which implies LLDPE improves the thermo oxidative aging resistance of the binder. Furthermore, the storage stability test shows that at higher LLDPE concentrations phase separation may occur. DSR analysis shows that modified binders have lower temperature susceptibility and higher aging resistance with increased stiffness and elastic behavior compared with unmodified binders. In addition, modified binders show enhanced resistance against high temperature rutting and at low temperature fatigue performance. It was found that the optimum LLDPE content is 6%.

scholarly journals Investigation on the Short-Term Aging-Resistance of Thermoplastic Polyurethane-Modified Asphalt Binders

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1189 ◽  
Author(s):  
Ruien Yu ◽  
Xijing Zhu ◽  
Maorong Zhang ◽  
Changqing Fang
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
High Speed ◽  
Storage Stability ◽  
Thermoplastic Polyurethane ◽  
Short Term ◽  
Modified Asphalt ◽  
Aging Resistance ◽  
High Temperature Storage ◽  
Temperature Storage

In this reported work, thermoplastic polyurethane (TPU) was used as a reactive polymer modifying agent to prepare a modified-asphalt, using a high-speed shearing method. Physical performance tests of the TPU-modified asphalt were conducted before and after short-term aging, and the aging resistance was examined by the change in materials properties. In addition, low-temperature rheological properties, thermal properties, the high-temperature storage stability, and the aging mechanism of TPU-modified asphalt were also investigated. The results showed that the addition of TPU improved the aging resistance of base asphalt, which was evidenced by the increased penetration ratio and decreased softening point of the asphalt, after aging. Similarly, Fourier Transform infrared (FTIR) spectroscopy results verified that TPU improved the asphalt aging resistance. It was found that the TPU functional groups played a role in improving thermal properties, high-temperature storage stability, and in the dispersion of modified asphalt.

scholarly journals Identifying the Long-Term Thermal Storage Stability of SBS-Polymer-Modified Asphalt, including Physical Indexes, Rheological Properties, and Micro-Structures Characteristics

2021 ◽  
Vol 13 (19) ◽  
pp. 10582
Author(s):  
Peng Wang ◽  
Hong-Rui Wei ◽  
Xi-Yin Liu ◽  
Rui-Bo Ren ◽  
Li-Zhi Wang
Keyword(s):  
Phase Separation ◽  
Rheological Properties ◽  
Softening Point ◽  
Storage Stability ◽  
Thermal Storage ◽  
Least Squares Regression ◽  
Modified Bitumen ◽  
Long Term Storage ◽  
Asphalt Performance

The thermal storage stability of styrene–butadiene–styrene tri-block copolymer modified bitumen (SBSPMB) is the key to avoid performance attenuation during storage and transportation in pavement engineering. However, existing evaluation index softening point difference within 48 h (ΔSP48) cannot effectively distinguish this attenuation of SBSPMB. Thus, conventional physical indexes, rheological properties, and micro-structure characteristics of SBSPMB during a 10-day storage were investigated in this research. Results showed that during long-term thermal storage under 163 °C for 10 days, penetration, ductility, softening point, recovery rate (R%), and anti-rutting factor (G*/sinδ) were decayed with storage time increasing. This outcome was ascribed to the phase separation of SBS, which mainly occurred after a 4-day storage. However, ΔSP48 after a 6-day storage met the specification requirements (i.e., below 2.5 °C). Thus, the attenuation degree of asphalt performance in field storage was not effectively characterized by ΔSP48 alone. Results from network strength (I) and SBS swelling degree tests revealed that the primary cause was SBS degradation and base asphalt aging. Moreover, conventional indexes, including penetration, ductility, and softening point, were used to build a prediction model for rheological properties after long-term storage using partial least squares regression model, which can effectively predict I, R, Jnr, G*/sinδ, and SBS amount. Correlation coefficient is above 0.8. G*/sinδ and I at the top and bottom storage locations had high coefficient with SBS amount. Thus, phase separation of SBSPMB should be evaluated during thermal storage.

scholarly journals Transitions in rheological properties of modified bitumen containing chemical additives

2021 ◽  
Vol 1197 (1) ◽  
pp. 012045
Author(s):  
S Poorna Prajna ◽  
P S Lakshmi ◽  
G Gayathri ◽  
M Beulah ◽  
M R Sudhir
Keyword(s):  
Titanium Dioxide ◽  
Carbon Black ◽  
Rheological Properties ◽  
Chemical Additives ◽  
Modified Bitumen ◽  
Liquid Form ◽  
Adhesive Properties ◽  
Low Temperature Cracking ◽  
Research Findings ◽  
Solid Form

Abstract Bitumen typically performs the function of a binder due to its adhesive properties and the ability to assume liquid form when heated and solid form when cooled. The softening of pavement bitumen during summer temperatures causes rutting on roads and its winter fragility leads to low-temperature cracking. In order to address these issues, a variety of additives have been proposed over the years as modifiers to improve the performance of bituminous concrete. In this direction, the aim of the present work was to establish the efficacy of the chemical additives, namely, titanium dioxide and carbon black in bitumen. To accomplish this objective, plain bitumen and modified bitumen samples with different percentages of titanium dioxide and carbon black were prepared and tested for various rheological properties. The study also examined the viscoelastic behaviour of the samples using dynamic shear rheometer. The findings of this study demonstrated that titanium dioxide and carbon black in bitumen are strong viscosity enhancers. Also, the modified bitumen specimen yielded in high phase angle indicating high viscous behavior and higher resistance to rutting and fatigue. The research findings also suggested that titanium dioxide and carbon black aid in the preparation of durable and sustainable mixtures for flexible pavements.

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