Low temperature and fatigue characteristics of treated crumb rubber modified asphalt after a long term aging procedure

2019 ◽  
Vol 234 ◽  
pp. 1262-1274 ◽  
Author(s):  
Zixuan Chen ◽  
Tao Wang ◽  
Jianzhong Pei ◽  
Serji Amirkhanian ◽  
Feipeng Xiao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Crumb Rubber ◽  
Modified Asphalt ◽  
Fatigue Characteristics

scholarly journals Evolution of Rheological Behaviors of Styrene-Butadiene-Styrene/Crumb Rubber Composite Modified Bitumen after Different Long-Term Aging Processes

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2345 ◽  
Author(s):  
Yangsheng Ye ◽  
Gang Xu ◽  
Liangwei Lou ◽  
Xianhua Chen ◽  
Degou Cai ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Crumb Rubber ◽  
Modified Bitumen ◽  
High Speed Railway ◽  
Modified Asphalt ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

In this study, a new type of composite modified bitumen was developed by blending styrene-butadiene-styrene (SBS) and crumb rubber (CR) with a chemical method to satisfy the durability requirements of waterproofing material in the waterproofing layer of high-speed railway subgrade. A pressure-aging-vessel test for 20, 40 and 80 h were conducted to obtain bitumen samples in different long-term aging conditions. Multiple stress creep recovery (MSCR) tests, linear amplitude scanning tests and bending beam rheometer tests were conducted on three kinds of asphalt binders (SBS modified asphalt, CR modified asphalt and SBS/CR composite modified asphalt) after different long-term aging processes, including high temperature permanent deformation performance, resistance to low temperature thermal and fatigue crack. Meanwhile, aging sensitivities were compared by different rheological indices. Results showed that SBS/CR composite modified asphalt possessed the best properties before and after aging. The elastic property of CR in SBS/CR composite modified asphalt improved the ability to resist low temperature thermal and fatigue cracks at a range of low and middle temperatures. Simultaneously, the copolymer network of SBS and CR significantly improved the elastic response of the asphalt SBS/CR modified asphalt at a range of high temperatures. Furthermore, all test results indicated that the SBS/CR modified asphalt possesses the outstanding ability to anti-aging. SBS/CR is an ideal kind of asphalt to satisfy the demand of 60 years of service life in the subgrade of high speed railway.

scholarly journals COMPARATIVE ANALYSIS OF LOW TEMPERATURE RESISTANCE FOR NANOCARBON AND OTHER BITUMENS

2020 ◽  
Vol 5 (443) ◽  
pp. 89-96
Author(s):  
Zhurinov M.Zh., ◽  
◽  
Teltayev B.B., ◽  
Kalybay A.A., ◽  
Rossi C.O., ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Low Temperature ◽  
Polyphosphoric Acid ◽  
Crumb Rubber ◽  
Petrochemical Plant ◽  
Short Term ◽  
Temperature Resistance ◽  
Coal Rock ◽  
Low Temperature Resistance

A comparative analysis of the low temperature resistance for a nanocarbon bitumen and other 30 neat and modified bitumens has been performed in the work. The stiffness at the temperatures of -24°С, -30°С and -36°С under technical system Superpave has been accepted as an indicator of low temperature resistance of the bitumens. The stiffness of the bitumens has been determined on a bending beam rheometer (standard ASTM D 6648-08). Before testing the bitumens have been subjected to the double artificial aging: short-term aging – under standard AASHTO Т 240-13 and long-term aging – under standard ASTM D 6521-08. The nanocarbon bitumen has been prepared in the laboratory of the Kazakhstan Highway Research Institute (KazdorNII) with the use of a road bitumen of the grade BND 70/100 produced by the Pavlodar petrochemical plant (PNHZ) and a nanocarbon powder (2% by weight) manufactured from a coal rock of the deposit “Saryadyr” “Corporation “ON-Olzha” LLP, Akmola region, Kazakhstan). The nanocarbon powder (150-200 nm) has been manufactured by three-stage size reduction of the coal rock: I – a mechanical dispergator (up to 2-3 mm), II – an aerodynamic mill (up to 20 mcm), III – a reactor with a rotating electromagnetic field. The neat bitumens of the grades BND 50/70, BND 70/100, BND 100/130 have been produced by the plants of Kazakhstan and Russia; they satisfy the requirements of the standard ST RK 1373-2013. The modified bitumens have been prepared in the laboratory of KazdorNII with the use of the neat bitumens, 7 types of the polymers, crumb rubber and polyphosphoric acid and they satisfy the requirements of the standard ST RK 2534-2014. It has been determined that the nanocarbon bitumen is one of the most resistant at the low temperatures: -24°С, -30°С and -36°С.

scholarly journals Preparation and Performance Analysis of High-Viscosity and Elastic Recovery Modified Asphalt Binder

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Liangchen Qu ◽  
Yingli Gao ◽  
Hui Yao ◽  
Dandan Cao ◽  
Ganpeng Pei ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Elastic Recovery ◽  
Asphalt Binder ◽  
Temperature Stability ◽  
Crumb Rubber ◽  
High Viscosity ◽  
High Temperature Stability ◽  
Modified Asphalt ◽  
And Performance

This study presented the preparation and performance of a kind of high viscosity and elastic recovery asphalt (HVERA) by using some modifiers. The performance of styrene-butadiene-styrene (SBS), rock asphalt (RA), crumb rubber (CR), and stabilizing agent (SA) for different modifiers was investigated by conventional binder test. Effects of modifiers on the high- and low-temperature properties of HVERA were investigated. The dynamic viscosity (DV) test, dynamic shear rheometer (DSR), and bending beam rheometer (BBR) analysis indicated that the high- and low-temperature rheological properties of asphalt were improved attribute to the addition of mixture of modifiers. Meanwhile, the short-term aging and long-term aging were simulated by rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests. Furthermore, the Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) measurements were conducted for obtaining the mechanism and microstructure distribution of the modified asphalt binders. From the test results in this study, it was evident that the addition of SBS, RA, CR, and SA into a neat asphalt binder could both significantly improve the viscosity of the binder at high temperature and lower the creep stiffness at low temperature, which was beneficial to better both high-temperature stability and low-temperature cracking resistance of asphalt pavements. It was proved that the high temperature grade of HVERA could be increased by increasing of RA and a proper percentage of modifiers could be improved by the low temperature grade of HVERA.

Effect of Aging on the Low-Temperature Properties of Asphalt Mixture

2013 ◽  
Vol 438-439 ◽  
pp. 383-386
Author(s):  
Ning Li Li ◽  
Xin Po Zhao ◽  
Cai Li Zhang ◽  
Qing Yi Xiao ◽  
Hu Hui Li
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Flexural Test ◽  
Short Term ◽  
Modified Asphalt ◽  
Aging Test ◽  
Cracking Performance

This article studies the low-temperature anti-cracking properties of plain asphalt mixtures and rubber-modified asphalt mixtures at different aging condition. Laboratory flexural test was conducted on the beam specimens of plain asphalt mixtures and rubber-modified asphalt mixtures. Experiment results indicate that rubber-modified asphalt mixtures have superior low-temperature anti-cracking performance than that of plain asphalt mixtures. Compared with the short term oven aging test, the long term oven aging test has more significant effect on the low-temperature anti-cracking of the mixture. In order to better represent the low-temperature anti-cracking of in-service aging asphalt pavement, the long term oven aging test should be used to appraise the low-temperature anti-cracking of asphalt pavements in china.

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.

Short-Term and Long-Term Aging Behavior of Rubber Modified Asphalt Paving Mixture

1996 ◽  
Vol 1530 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Robert Y. Liang ◽  
Suckhong Lee
Keyword(s):  
Complex Modulus ◽  
Resilient Modulus ◽  
Crumb Rubber ◽  
Test Results ◽  
Aging Behavior ◽  
Short Term ◽  
Modified Asphalt ◽  
Modified Binders ◽  
Asphalt Paving

Aging of asphalt has been an important subject area that has received extensive studies in recent years. Test results of short-term and long-term aging behavior of crumb rubber modifier (CRM) modified asphalt paving materials are presented. Eighteen combinations of CRM modified binders in terms of CRM size, CRM content, and base asphalt cement grade were studied by Brookfield viscometer test and dynamic shear rheometer test. The short-term aged binders were prepared using thin film oven test. Viscosity was measured at 350°F in the Brookfield thermosel after mixing at 375°F for 2 hr. The test results showed that the size and percentage of CRM affected the viscosity development in the modified binders: the smaller the CRM size and the higher the CRM content, the higher the viscosity measured after 2-hr reaction at 375°F. Short-term aging exerted more viscosity increase in the CRM modified binders than in the unmodified binders. Modified binders showed less weight loss than unmodified binders. The modified binders showed higher complex modulus G* than unmodified. Short-term aging increased G*, with modified binders exhibiting higher increase. The Marshall mix design yielded various CRM modified mixes. The result of indirect tensile strength tests showed that short-term and long-term aging increased the measured tensile strengths. The resilient modulus test results, in general, supported the general understanding that aging tended to increase resilient modulus.

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