Research on mechanical-activated nanoscale bentonite and surface aging behavior of its modified asphalt

2022 ◽  
Vol 321 ◽  
pp. 126356
Author(s):  
Shun Chen ◽  
Bo Zhang ◽  
Xingyang He ◽  
Ying Su ◽  
Qiao Liu ◽  
...  
Keyword(s):  
Aging Behavior ◽  
Modified Asphalt

Application of Nonlinear Differential Dynamic Model to Evaluate Long-Term Aging Behavior of SBS Modified Asphalt

2013 ◽  
Vol 710 ◽  
pp. 376-381 ◽  
Author(s):  
Yue Qin Hou ◽  
Xiao Ping Ji ◽  
Xue Zhang Tan
Keyword(s):  
Dynamic Model ◽  
Softening Point ◽  
Rate Equations ◽  
Aging Behavior ◽  
Aging Rate ◽  
Modified Asphalt ◽  
Aging Test ◽  
Two Parameters ◽  
Sbs Modified Asphalt

In order to study the long-term aging behavior of SBS modified asphalt, a nonlinear differential dynamic model was developed and the aging tests with rolling thin film oven test (RTFOT) for SBS modified asphalt were carried out. The dynamic model was developed referring to the population developing model with two parameters, namely average aging rate and aging ratio. And the differentiation of the dynamic model was the aging rate equation with which can calculate the aging rate at any time. The aging tests with RTFOT for SBS modified asphalt at different times were carried out and the penetration, ductility at 5°C, softening point and viscosity at 135°C were measured after RTFOT. With the rest results, the two parameters of nonlinear differential dynamic model of above four indexes were determined, and further the aging rate equations were deduced. The research results show that the nonlinear differential dynamic model can exactly describe the varying behavior of penetration, ductility, softening point and viscosity of SBS modified asphalt after RTFOT aging test with different time. The aging rate reach maximum value at the beginning and becomes smaller and smaller as the time goes.

Research on Mechanical-Activated Nanoscale Bentonite and Surface Aging Behavior of its Modified Asphalt

2021 ◽  
Author(s):  
Shun Chen ◽  
Bo Zhang ◽  
Xingyang He ◽  
Ying Su ◽  
Qiao Liu ◽  
...  
Keyword(s):  
Aging Behavior ◽  
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.

Aging Behavior of SBS Modified Asphalt in Coupled Water – Heat Condition

2013 ◽  
Vol 723 ◽  
pp. 575-579 ◽  
Author(s):  
Jiu Guang Geng ◽  
Qian Wang ◽  
Wei Guang Li
Keyword(s):  
Infrared Spectroscopy ◽  
Hydration Reaction ◽  
Carbonyl Groups ◽  
Aging Behavior ◽  
Spectroscopy Analysis ◽  
Heat Condition ◽  
Modified Asphalt ◽  
Polar Groups ◽  
Asphalt Performance ◽  
Sbs Modified Asphalt

The aging simulating tests of the SBS and SBS modified asphalt under the conditions of wet and dry are compared and the effect of water on the aging of modified asphalt was investigated by infrared spectroscopy analysis. The results showed that: after aging in the wet conditions the change range of asphalt performance increased. Infrared spectroscopy analysis results showed that the carbonyl content of asphalt and SBS after the aging in wet conditions increased. It was proved that the presence of water accelerated the aging of asphalt and SBS under the action of heat and oxygen. This is mainly due to the substances containing carbonyl groups is further oxidized into carboxylic acids under the action of water, while the double bond in SBS chain can occur the hydration reaction in the coupled WaterHeat condition and become the polar groups.

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