Effects of Diffusible Rejuvenator on Properties of Recycled Asphalt Mixture

2014 ◽  
Vol 599 ◽  
pp. 145-149
Author(s):  
De Feng Qin ◽  
Jian Ying Yu ◽  
Xin Huang
Keyword(s):  
Low Temperature ◽  
Fatigue Resistance ◽  
Asphalt Mixture ◽  
Water Stability ◽  
Cracking Resistance ◽  
Recycled Asphalt ◽  
Low Temperature Cracking

The diffusible rejuvenator containing dissolving-diffusing agent was prepared. Effects of the diffusible rejuvenator on properties of recycled asphalt mixture were investigated in comparison with those of common rejuvenator. The results show that the properties of recycled asphalt mixture were significantly improved with the addition of the diffusible rejuvenator due to its good diffusibility. Water stability, low-temperature cracking resistance and fatigue resistance of recycled asphalt mixture are closest to virgin mixture when increasing the diffusible rejuvenator content up to 15 wt%.

scholarly journals Recycling Aged Asphalt Using Hard Asphalt Binder for Hot-Mixing Recycled Asphalt Mixture

2021 ◽  
Vol 11 (12) ◽  
pp. 5698
Author(s):  
Jian Zhou ◽  
Jing Li ◽  
Guoqiang Liu ◽  
Tao Yang ◽  
Yongli Zhao
Keyword(s):  
Low Temperature ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Cracking Resistance ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Aged Asphalt ◽  
Low Temperature Cracking

Increasing the content of reclaimed asphalt pavement material (RAP) in hot-mix recycled asphalt mixture (RHMA) with a satisfactory performance has been a hot topic in recent years. In this study, the performances of Trinidad lake asphalt (TLA), virgin asphalt binder, and aged asphalt binder were first compared, and then the modification mechanism of TLA on virgin asphalt and aged asphalt was explored. Furthermore, the RHMA was designed in accordance with the French norm NF P 98-140 containing 50% and 100% RAP, and their high-temperature stability, low-temperature cracking resistance, and fatigue performances were tested to be compared with the conventional dense gradation AC-20 asphalt mixture. The results show that the addition of TLA changes the component proportion of virgin asphalt binder, but no new functional groups are produced. The hard asphalt binder modified by TLA has a better rutting resistance, while the fatigue and cracking resistance is lower, compared to both aged and virgin asphalt. The high-modulus design concept of RHMA is a promising way to increase the RAP content in RHMA with acceptable performance. Generally, the RHMA with 50% RAP has similar properties to AC-20. And, when the RAP content reaches 100%, the high- and low-temperature performance and anti-fatigue performance of RHMA are better than AC-20 mixture. Thus, recycling aged asphalt using hard asphalt binder for hot-mixing recycled asphalt mixture to increase the RAP content is feasible.

Experimental Research on the Performances of Warm Mix Recycled Asphalt Mixture in Road Application

2011 ◽  
Vol 243-249 ◽  
pp. 4207-4212
Author(s):  
Ji Shu Sun ◽  
Chun Feng Yang ◽  
Zhao Xia Chen ◽  
Hui Ran Pi
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Experimental Research ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Water Stability ◽  
Recycled Asphalt ◽  
Pavement Structures

The effect of sasobit’s quantity exerted on the asphalt viscosity was researched firstly in this paper, and the mixing temperature of warm mix recycled Asphalt mixture was determined. Then, the technical performances of warm mix recycled asphalt mixture on high temperature, low temperature and water stability were studied through systematic experiments. And compared the technical indexes with that of hot mix asphalt. The results showed that sasobit could reduce asphalt viscosity significantly, so it could lower the mixing and compaction temperatures of the recycled asphalt mixture. The technical indexes of warm mix recycled asphalt mixture conform to the current specifications, so it can be used in many pavement structures.

Research of Coarse Grading Asphalt Mixtures Based on Grey Relational Analysis

2014 ◽  
Vol 599 ◽  
pp. 234-238 ◽  
Author(s):  
Liang Liang Tu ◽  
Jun Zheng ◽  
Shao Peng Wu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Grey Relational Analysis ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Water Stability ◽  
High Temperature Stability ◽  
Relational Analysis ◽  
Low Temperature Cracking ◽  
Grey Relational

Grey relational analysis (GRA) is an important data handling techniques. In this paper, combining the characteristics of asphalt mixture, the method of GRA is applied to the study of coarse grading. The high temperature stability, low temperature cracking resistance and water stability of asphalt mixture with different grading were evaluated in the laboratory. The results showed that OGFC-25 gradation apply to asphalt mixture that demand high temperature stability. Similarly, ATB-25 gradation benefit low temperature performance and SUP-25 benefit water stability.

The Effect of Different Warm Additives on Performance Properties of HMA

2012 ◽  
Vol 178-181 ◽  
pp. 1369-1372 ◽  
Author(s):  
Shao Wen Du ◽  
Shan Shan Li
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Moisture Resistance ◽  
Cracking Resistance ◽  
Rutting Resistance ◽  
Performance Properties ◽  
Compaction Temperature ◽  
Low Temperature Cracking ◽  
Negative Effect ◽  
Warm Additives

The effect of three types of warm additives, including Sasobit, Aspha-min and Evotherm DAT, on the compaction temperature, rutting resistance, low temperature resistance and moisture resistance of hot asphalt mixture (HMA) were evaluated by laboratory test. The test results show that Sasobit, Aspha-min and Evotherm DAT can reduce the compaction temperature of HMA by 27°C, 20°C and 30°C respectively. These warm additives all can improve obviously the rutting resistance of HMA. However, Evotherm DAT can increase low temperature cracking resistance ability of HMA. Aspha-min has obviously negative effect on the low temperature cracking resistance and moisture resistance of HMA. Therefore, it is necessary to investigate performance properties of HMA when selecting warm additives.

Research on Separation and Regeneration Aggregate of Recycled Asphalt Mixture Road Performance

2015 ◽  
Vol 1095 ◽  
pp. 276-279
Author(s):  
Xin Feng Zhou ◽  
Xi Juan Xu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Asphalt Mixture ◽  
Recycled Aggregate ◽  
Water Stability ◽  
Recycled Asphalt ◽  
Aggregate Content ◽  
Temperature Performance ◽  
Road Performance ◽  
Low Temperature Performance

Through the research of different separation and regeneration aggregate content, different types of regenerative high temperature stability, low temperature performance and water stability performance of asphalt mixture comprehensively, the results show that: with the increase of recycled aggregate content, improves the high temperature properties of recycled asphalt mixture, low temperature performance and water stability are reduced, the admixture when regeneration aggregate is 20 ~ 25%, recycled asphalt mixture has good road performance. Key words: road engineering;waste asphalt mixture;separation and regeneration aggregate;road performance

Study on Road Performance of Phase-Change Temperature-Adjusting Asphalt Mixture

2011 ◽  
Vol 287-290 ◽  
pp. 978-981 ◽  
Author(s):  
Biao Ma ◽  
Jun Li ◽  
Ren Wei Liu ◽  
Jin Ma
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Phase Change ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Water Stability ◽  
High Temperature Stability ◽  
Low Temperature Cracking ◽  
Long Time ◽  
Road Performance

Mixing the composite phase change material (CPCM) to asphalt mixture is a new way to solve the worldwide problem of the low-temperature cracking and high temperature rutting of the asphalt pavement. Asphalt mixture with CPCM can remain in the ideal working temperature range for a relatively long time. This paper analyzes the influence of the contents of CPCM on its road performance by laboratory testing. The study shows that mixing CPCM to asphalt mixture had little effect to the optimal asphalt content. For CPCM prepared by polymer shape-stabilized method, the high-temperature stability and the water stability of asphalt mixture increases firstly and then decreases the low-temperature anti-cracking stability decreases firstly and then increases with the increasing of CPCM. For CPCM prepared by carrier-adsorbed packaging process, the high-temperature stability decreases, low-temperature anti-cracking stability decreases firstly and then increases, the water stability increases firstly and then decreases with increasing of CPCM. The results indicate that CPCM has significant influences on its road performance. The optimal content of CPCM is around 0.3%.

Effects of Aging on the Low Temperature Properties of Asphalt Binder and its Mixture

2017 ◽  
Vol 898 ◽  
pp. 2018-2022 ◽  
Author(s):  
Zhang Chao Cui ◽  
Ling Pang ◽  
Nai Zhi Zhang ◽  
Xue Mei Zhang ◽  
He Chuan Li
Keyword(s):  
Low Temperature ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Physical Parameters ◽  
Cracking Resistance ◽  
Three Point Bending ◽  
Aging Properties ◽  
Modified Asphalt Binder ◽  
Low Temperature Cracking ◽  
Effects Of Aging

Effect of aging on physical properties of asphalt binder was studied. The relationship between degradation of the low temperature properties of asphalt binder and asphalt mixture was also investigated. After the thin film oven test (TFOT) with different aging time, the AH-70 binder and the SBS modified asphalt binder were used to prepared asphalt mixture samples. The binder was characterized using penetration, ductility and Beam Bending Rheometer (BBR), and the low temperature cracking resistance of asphalt mixture was studied by Three-point Bending Fracture (TBF). The correlation between different physical parameters of binder, as well as between different aging properties of the binder and asphalt mixture, was examined. The results showed that aging influenced binder physics significantly, and resulted in a decline in the properties of low temperature cracking resistance of asphalt mixture. Although, aging susceptibility of binder and asphalt mixture may be ranked differently when different evaluation methods ware used, a strong correlation was observed between the aging of binder and asphalt mixture.

scholarly journals Effect of Blending Degree between Virgin and Aged Binder on Pavement Performance of Recycled Asphalt Mixture with High RAP Content

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Ying Xu ◽  
Zhijing Chou ◽  
Yunze Li ◽  
Jie Ji ◽  
Shi-fa Xu
Keyword(s):  
Low Temperature ◽  
Fatigue Resistance ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Pavement Performance ◽  
Design Stage ◽  
Recycled Asphalt ◽  
Moisture Stability ◽  
Aged Binder ◽  
Resistance Performance

In this study, the influence of the blending degree between virgin and aged binder on the pavement performance of hot-mix recycled asphalt mixture (HMRAM) with high RAP content is analyzed. The aggregate gradation of AC-16 was selected. The RAP contents were 30, 40, and 50%. HMRAMs with different degrees of blending (DOBs) were prepared by changing the mixing temperature (150, 165, and 180°C) without the occurrence of excessive aging for asphalt binders. An improved Hirsch dynamic modulus prediction model was then used to quantitatively characterize the DOB of HMRAM. Finally, the high-temperature, low-temperature, moisture stability, and fatigue resistance performance of HMRAM were tested and the effect of the DOB between the virgin and aged asphalt binder on the pavement performance was analyzed. The results showed that the DOB between the virgin and aged asphalt binder cannot reach 100% at the three mixing temperatures for HMRAM with 30, 40, and 50% RAP contents, which is inconsistent with the assumption of complete blending in China’s specification. The dynamic stability of the mixture gradually decreases with the increased DOB for HMRAM with a high RAP content, while the moisture stability, low-temperature, and fatigue resistance performance are continuously improved. This means that with the increase in DOB in the stage of open to traffic, meeting high-temperature performance criteria at the design stage may become unsatisfactory for HMRAM. The moisture stability, low-temperature performance, and fatigue resistance performances of HMRAM measured at the design stage were reasonable and conservative. The change in DOB significantly affects the content and properties of total free binder in HMRAM, affecting pavement performance. The content and physical properties of the RAP aggregate also have a significant impact on pavement performance.

scholarly journals Study on the Performance of the Physical Foaming Warm-mix Recycled Asphalt Mixture

2021 ◽  
Vol 261 ◽  
pp. 02058
Author(s):  
Zheng Zhigang ◽  
He Yunwu ◽  
Wang Tao ◽  
Wei Hanxin ◽  
Liang Xiayi ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Crack Resistance ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Water Stability ◽  
High Temperature Stability ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Temperature Crack

In order to evaluate the performance of the physical foaming warm-mix recycled asphalt mixture (WRAM), the hot mix plant recycling technology was adopted to develop AC-20 hot-mix recycled asphalt mixture (HRAM) and the WRAM of different reclaimed asphalt pavement (RAP) contents. The high temperature stability, water stability and low temperature crack resistance performance of the reclaimed asphalt pavement were evaluated. The results indicate that the physical foaming WRAM feature better high temperature stability, water stability and low temperature crack resistance compared to those of HRAM. With the increase in RAP contents, the high temperature stability of the physical foaming WRAM and HRAM rises notably but the water stability and low temperature crack resistance performance continues to drop.

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