scholarly journals Rheological Characteristics of Tire Rubber-Modified Asphalt following Thermal Variation

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
S. Chen ◽  
J. Cao ◽  
C. f. Zheng ◽  
X. D. Guo
Keyword(s):  
Low Temperature ◽  
Automobile Industry ◽  
Urgent Problem ◽  
Thermal Variation ◽  
Rubber Powder ◽  
Waste Tires ◽  
Modified Asphalt ◽  
Temperature Shear ◽  
Powder Content ◽  
Modify Asphalt

In recent years, due to the development of the automobile industry, there are more and more waste car tires, and the reuse of waste tires has become an urgent problem to be solved. In this study, the crushed rubber of waste automobile tires is used to modify asphalt to prepare rubber-modified asphalt, which can not only solve the problem of using waste tires but also effectively improve the performance of asphalt pavement. This study defines four modified asphalts with different rubber powder content, which are defined as 1#, 2#, 3#, and 4#, respectively. The performance difference between the four modified asphalts and the base asphalt was compared through experiments to illustrate the advantages of rubber-modified asphalt. The four selected rubber asphalts and base asphalt are subjected to the viscous toughness test, apparent viscosity test, DSR test, and BBR test to determine the high- and low-temperature characteristics of rubber asphalt. The analysis of experimental data shows that rubber-modified asphalt can effectively improve the low-temperature performance of the asphalt, make the asphalt have better toughness, and also improve the high-temperature shear resistance of the asphalt. Finally, it is determined that adding 10% rubber powder to the base asphalt has the best effect.

scholarly journals Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

2021 ◽  
Vol 7 ◽  
Author(s):  
Hengxiao Xue ◽  
Yuanbo Cao ◽  
Qi Liu ◽  
Hongfei Zhang ◽  
Mingliang Zhang
Keyword(s):  
Low Temperature ◽  
Softening Point ◽  
Stability Index ◽  
Test Methods ◽  
Segregation Index ◽  
Rubber Powder ◽  
Evaluation Indexes ◽  
Modified Asphalt ◽  
Powder Content ◽  
Storage Properties

Ground tires are one of the main sources of urban solid waste. Rubber powder-modified asphalt provides an effective method to solve the problem, and it presents good high- and low-temperature performance in sustainable pavement construction. However, the storage properties of rubber powder-modified asphalts prepared from the traditional low-temperature shear mixing method are unstable, which restricts their application. In this study, four test methods (the softening-point test; the dynamic shear rheological test; the Laboratory Asphalt Stability Test; and fluorescence image analysis) and six evaluation indexes (the softening-point difference Sdiff, the segregation percentage Sp, the segregation index Ise, the segregation rate Rs, the degradation rate Rd, and the stability index Ist) were employed to analyze the storage abilities of asphalts modified by various activated rubber powder contents. The results show that the storage properties have a positive correlation with rubber powder content in the modified asphalt, and a rubber powder content of 60% is proven to be the optimum mixing amount. The rubber powders can distribute uniformly in the asphalt matrix when mixed below the optimum mixing amount; otherwise a rubber powder agglomeration is formed. The quantitative morphology analysis results are in good agreement with the laboratory test conclusions. The activated rubber powder shows better compatibility compared with ordinary rubber powders and presents a promising method to treat waste ground tires.

Study on the Freeze-to-Crack Test of Asphalt Modified by Waste-PE in Packing

2008 ◽  
Vol 575-578 ◽  
pp. 875-880
Author(s):  
Chang Qing Fang ◽  
Tie Hu Li ◽  
De Qi Jing ◽  
Yong Bing Ji
Keyword(s):  
Low Temperature ◽  
Breaking Point ◽  
New Method ◽  
Testing Methods ◽  
Modified Asphalt ◽  
Shear Yield ◽  
Crack Pinning ◽  
Modify Asphalt

The purposes of this study are to modify asphalt by retrieved waste-PE in packing (WPP) and to investigate the low temperature properties of the modified asphalt. The traditional testing methods such as low temperature ductility, low temperature penetration degree, penetration or Fraass breaking point think that PE can not improve the low temperature properties of asphalt effectively, while this study adopts a new method to test the low temperature properties of WPP modified asphalt through the freeze-to-crack test. The result indicated that, after the modification, the low temperature properties of asphalt are improved, which coincides with the fact. And the improvement of the low temperature properties can be explained by the function of Shear yield and crack pinning.

scholarly journals Research on the Influence of Nanocarbon/Copolymer SBS/Rubber Powder Composite Modification on the Properties of Asphalt and Mixtures

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Wenhui Zhao ◽  
Xiangbing Xie ◽  
Guanghui Li ◽  
Jiuguang Geng ◽  
Meng Bao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Powder Composite ◽  
High Temperature Stability ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
Modification Process ◽  
Low Temperature Cracking ◽  
Surface Modified

To expand the application range of modified asphalt and mixtures and effectively reduce the aggregation of nanomaterials in asphalt, nanocarbon/styrene butadiene styrene (SBS)/rubber powder composite-modified asphalt is proposed. This paper presents a laboratory study on the performance of nanocarbon/copolymer SBS/rubber powder composite-modified asphalt, and nanocarbon particles modified by titanate coupling agents as modifiers are selected. The nanocarbon/copolymer SBS/rubber powder composite-modified asphalt was prepared by a high-speed shearing method. The physical properties and rheological performance were assessed using ductility tests, softening point tests, penetration tests, dynamic shear rheometer (DSR) tests, and bending beam rheometer (BBR) tests. Furthermore, the mixture properties, including the high-temperature stability, low-temperature cracking resistance, moisture stability, and freeze-thaw splitting, were evaluated in the laboratory. The micromorphology of the base asphalt and composite-modified asphalt was examined by scanning electron microscopy (SEM), and the reactions between the modifiers and AH-70 base asphalt were studied by Fourier transform infrared spectroscopy (FTIR). The results reveal that the surface-modified nanocarbon and rubber powder additives substantially increased the softening point and penetration index of the base asphalt, with little obvious influence on the low-temperature performance. In addition, when nanocarbon/copolymer SBS/rubber powder composite-modified asphalt was used, the high-temperature stability and low-temperature cracking resistance of the nanocarbon/copolymer SBS/rubber powder composite-modified asphalt mixture were approximately 1.3 times those of the nanocarbon/rubber powder asphalt mixture. In terms of the micromorphology and reaction, the addition of the nanocarbon can increase the compatibility between the base asphalt and rubber powder, and then the addition of copolymer SBS can improve the structure of nanocarbon (after surface modification)/rubber powder-modified asphalt to form a stable network. Moreover, the physical reaction plays the dominant role in the modification process for the rubber powder and base asphalt, and chemical reactions occur in the modification process for the surface-modified nanocarbon and base asphalt.

scholarly journals Effect of Diatomite and Basalt Fibers on Pavement Performance and Vibration Attenuation of Waste Tires Rubber-Modified Asphalt Mixtures

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Chunli Wu ◽  
Liding Li ◽  
Yongchun Cheng ◽  
Zhengwei Gu ◽  
Zehua Lv ◽  
...  
Keyword(s):  
Low Temperature ◽  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Basalt Fibers ◽  
Waste Tires ◽  
Modified Asphalt ◽  
Correlation Degree ◽  
Vibration Attenuation ◽  
Pavement Engineering ◽  
Low Temperature Cracking

As an eco-friendly pavement material, waste tires rubber-modified asphalt mixtures (WRMs) have been applied in pavement engineering widely. To further improve the performance and adaptability of WRM, diatomite and basalt fibers are, respectively, added to WRM. Subsequently, the Marshall tests, the rutting tests, the low-temperature splitting tests, the freeze-thaw splitting tests, and the vibration attenuation tests are conducted to study the effect of diatomite and basalt fibers on pavement properties of WRM. Furthermore, the correlation degree between the content of diatomite, basalt fibers, asphalt, and the pavement properties of WRM is analysed by the grey correlation grade analysis (GCGA). The results show that the addition of diatomite and basalt fibers can significantly improve the pavement and vibration attenuation properties of WRM. The improvement of high-temperature permanent deformation resistance, low-temperature cracking resistance, and water damage resistance of WRM is mainly attributed to diatomite, basalt fibers, and asphalt-aggregate ratio, respectively. The improvement of the vibration attenuation of WRM by diatomite and basalt fibers is mainly attributed to the increase of waste tires rubber-modified asphalt (WRA) content caused by adding diatomite and basalt fibers.

scholarly journals Influence of the Mineral Powder Content on the Asphalt Aging Resistance in High-Altitude Areas Based on Indoor Ultraviolet Light Tests

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 754
Author(s):  
Xiangbing Xie ◽  
Huixia Li ◽  
Junchao Duan ◽  
Guanghui Li ◽  
Shenjia Tong
Keyword(s):  
Low Temperature ◽  
Uv Irradiation ◽  
Filler Content ◽  
Mass Ratio ◽  
Stiffness Modulus ◽  
Modified Asphalt ◽  
Creep Stiffness ◽  
Mineral Powder ◽  
Powder Content ◽  
Asphalt Mortar

Intense ultraviolet irradiation is an important environmental factor affecting the service performance of asphalt mixtures in high-altitude areas, and the asphalt mortar is the main factor affecting the durability of asphalt mixtures. It is of great theoretical significance and engineering value to study the performance of the asphalt mortar at medium and low temperatures under ultraviolet irradiation. Therefore, this paper focuses on the evolution of the effect of the filler content on the rheological properties of different asphalt materials at low and medium temperatures under quantitative UV irradiation. Taking the average amount of UV irradiation observed annually in Northwest China as the indoor aging condition, the matrix asphalt mortar and modified asphalt mortar with different mass ratios of asphalt mortar are selected for indoor aging tests. Physical property tests, low-temperature performance tests, and dynamic shear rheological tests are carried out. The effects of the UV irradiation intensity and mineral powder content on the low temperature performance of the asphalt mortar are studied by variance analysis method, and the reasonable mass ratio range of the asphalt mortar under UV irradiation is proposed based on the standard residual square sum (STRSS) method. The results show that the temperature sensibility and low-temperature deformation energy significantly decrease with the increase in the filler content, while the values of the softening point, fatigue factor (G*sin δ), and creep stiffness modulus of the asphalt mortar increase. In addition, the variance analysis of the creep stiffness modulus aging index (SAI) shows that the ultraviolet radiation intensity has a significant impact on the performance of the asphalt mortar. When the mineral powder content is less than 40%. When the filler content is greater than 40%, the filler content effects the performance of the asphalt mortar. According to the standard residual square sum (STRSS) method, the best mass ratio of the base asphalt mortar is 1.096, and the best mass ratio of the modified asphalt mortar is 0.9091.

Study on Performance of Rubber Powder Modified Asphalt Mixture

2014 ◽  
Vol 599 ◽  
pp. 252-256 ◽  
Author(s):  
Yan Shuang Zhang ◽  
Quan Liang Li ◽  
Jian Zhong Dong ◽  
Qing Hu Zhang
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Key Words ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Performance Study ◽  
High Temperature Stability ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
Asphalt Performance

Through the asphalt performance experiment, obtains the best proportion of rubber powder. Through the contrast test of asphalt mixture, the water sensibility, high temperature stability and low temperature stability of asphalt mixture have been studied. Key words: rubber powder modified asphalt asphalt mixture performance study

Microstructure and Temperature Characterization of Compound Crumb Rubber Modified Asphalt

2014 ◽  
Vol 1052 ◽  
pp. 382-386 ◽  
Author(s):  
Lan Wang ◽  
Jiang San Hu ◽  
Gang Chen
Keyword(s):  
Complex Modulus ◽  
Crumb Rubber ◽  
Dynamic Shear ◽  
Rotational Viscometer ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
Rubber Particles ◽  
Powder Content ◽  
Rotary Viscometer

Compound Crumb Rubber Modified Asphalt (CCRMA) is a mixture of waste rubber tire powder, SBS modifier and asphalt in order to modify the characteristics of asphalt. The application of using crumb rubber powder in making CCRMA is important in improvement of working characteristics of asphalt as well as in pollution control and environment protection. CCRMA, crumb rubber particles, SBS modifier and base asphalt have been examined by Scanning Electron Microscope (SEM) to observe the microcosmic appearance and the characteristic distribution of crumb rubber particles and SBS modifier in asphalt. The rotary viscometer test and dynamic shear test of CCRMA were carried out by rotational viscometer and Dynamic Shear Rheology (DSR). The influences of rubber powder content and reaction time to viscosity of CCRMA have been studied. In the stage of current study, complex modulus and phase angle of CCRMA are parameters reflecting viscoelasticity, the relation between them and temperature are researched.

Research on Microstructure and Low Temperature Properties of Polymer Modified Asphalt

2015 ◽  
Vol 1094 ◽  
pp. 253-260
Author(s):  
Lan Wang ◽  
Yong Jie Jia ◽  
Lei Feng
Keyword(s):  
Low Temperature ◽  
Aging Effect ◽  
Crumb Rubber ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
Macroscopic Structure ◽  
Before And After ◽  
Creep Stiffness ◽  
Distribution State ◽  
Polymer Modified Asphalt

In view of three kinds of polymer modified asphalt, Compound rubber powder modified asphalt, rubber powder modified asphalt and SBS modified asphalt, were commonly used in the Inner Mongolia region, scanning electron microscope (SEM) were used to observe the macroscopic structure morphology of asphalt before and after aging , getting the influence of aging effect on modifier’s distribution state in asphalt and interface combination properties between the asphalt, that is, after aging, three kinds of modifier and asphalt interface characteristic deterioration. By using bending beam rheometer (BBR) three kinds of asphalt after aging were conducted trabecular bending creep experiments under different temperature, through analyzing the changing rules of bending creep stiffness modulus S and the value of m, it can be get that: composite rubber powder modified asphalt has the best low temperature performance , followed by the crumb rubber modified asphalt.

Process Parameters of Rubber Powder Particles Modified Asphalt

2014 ◽  
Vol 900 ◽  
pp. 491-498
Author(s):  
Yu Mao ◽  
Yang Liu ◽  
Pei Wen Hao ◽  
Hai Nian Wang
Keyword(s):  
Process Parameters ◽  
Performance Indicators ◽  
Asphalt Mixture ◽  
Airborne Dust ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
The Road ◽  
Powder Particles ◽  
New Type ◽  
Temperature Shear

A new type rubber powder particle modifier can be produced by adding some performance improvement additives into normal 40-60 mesh rubber powder, and re-granulation, it mixed well with the base asphalt, having less airborne dust and better performance. Researching the performance indicators of rubber powder particles modified asphalt under different process parameters through the adjustment of shear temperature, shear rate, shear time, and the dosage of rubber powder in the process of producing rubber powder particles modified asphalt, determining the optimal process parameters, and the road performance indicators of the modified asphalt mixture has been verified.

scholarly journals Study on Storage Stability of Activated Reclaimed Rubber Powder Modified Asphalt

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4684
Author(s):  
Peipei Kong ◽  
Gang Xu ◽  
Jingyao Yang ◽  
Xianhua Chen ◽  
Yaqin Zhu
Keyword(s):  
Storage Stability ◽  
Waste Recycling ◽  
Short Term ◽  
One Pot ◽  
Dual Purpose ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
Solid Waste Recycling ◽  
By Products ◽  
Modify Asphalt

The purpose of this research was to make full use of waste lubricating by-products (LBP) and reclaimed rubber powder (RR) to modify asphalt by a one-pot approach, so as to achieve the dual purpose of solving the poor storage stability of reclaimed rubber powder modified asphalt (RRMA) and the realization of solid waste recycling. A variety of characterization techniques were performed to analyze storage stability, conventional properties and microstructure of LBP-activated reclaimed rubber powder modified asphalt (Blend). Fourier transform infrared spectroscopy illustrated that not only the chemical composition of LBP was very similar to that of asphalt, but also the activation of LBP improved the compatibility of RR with asphalt and enhanced the storage stability of Blend. Fluorescence spectrum and scanning electron microscopy results indicated that the RR without LBP activation was aggregated and dispersed as blocks in asphalt, while the LBP activated RR was uniformly dispersed in the asphalt phase. The segregation test demonstrated that Blend exhibited outstanding storage stability, in which the softening point difference was within 2.5 °C and the segregation rate was −0.2–0.2. In addition, the conventional properties of Blend have been significantly improved, especially in penetration and ductility. More importantly, the short-term aging results demonstrated that, compared with RRMA, Blend possessed excellent anti-aging performance.

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