Evaluation of low temperature performance of warm mix asphalt by glass transition temperature

2016 ◽  
pp. 1231-1236
Author(s):  
Xin Yu ◽  
Gu Fan ◽  
Fuqiang Dong ◽  
Gongying Ding ◽  
Tianyu Wang
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Low Temperature ◽  
Warm Mix Asphalt ◽  
Temperature Performance ◽  
Low Temperature Performance

scholarly journals Evaluation for Low Temperature Performance of SBS Modified Asphalt by Dynamic Shear Rheometer Method

Buildings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 408
Author(s):  
Tao Wang ◽  
Xuelei Wei ◽  
De Zhang ◽  
Hai Shi ◽  
Zhiqiang Cheng
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Low Temperature ◽  
Asphalt Binders ◽  
Dynamic Shear ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Wlf Equation ◽  
Low Temperature Performance ◽  
Sbs Modified Asphalt

Finding an alternative or supplementary test method to evaluating the low temperature performance of asphalt is an area of considerable interest. This paper tries to explore the possibility of using the dynamic shear rheometer (DSR) method for assessing the low temperature properties of styrenebutadienestyrene (SBS) modified asphalt. In the study, 60/80 and 80/100 pen grade asphalt binders, named binder A-70, binder B-70 and binder C-90, are used to produce the SBS modified asphalt samples. After that, the low temperature performance of the asphalt binders is characterized by using bending beam rheometer (BBR) test. The results indicate that the low temperature performance of the different binders is related to the source of the binder. The low temperature performance of asphalt could be improved with the addition of the SBS. The DSR test is used to develop the complex modulus master curves for binders. Based on the principle of time–temperature conversion, the glass transition temperature of asphalt is calculated by the Williams–Landel–Ferry (WLF) equation. The glass transition temperatures (Tg) of base asphalt and the SBS modified asphalt are determined by the viscoelastic parameters of the master curve and the WLF equation coefficients based on the time–temperature superposition principle. By establishing the relationship between the critical temperature and the Tg of the asphalt binder, the effectiveness of the method established in this paper is verified. The advantage of this method is the ability to use the DSR test for the rapid evaluation of the low temperature performance of asphalt, which is able to reduce testing materials and save testing time as well. The glass transition temperature of the SBS modified asphalt is closely associated with aging degree, asphalt source and the SBS content.

Citric acid grafting onto polyurethane for the control of molecular interactions and water compatibility

2016 ◽  
Vol 48 (8) ◽  
pp. 691-710
Author(s):  
Yong-Chan Chung ◽  
Hyeryoung Yoon ◽  
Jae Won Choi ◽  
Byoung Chul Chun
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Citric Acid ◽  
Low Temperature ◽  
Molecular Interactions ◽  
Water Permeability ◽  
Enthalpy Change ◽  
Low Temperature Flexibility ◽  
Grafting Onto

Citric acid (CA) was used as a grafted group onto polyurethane (PU) to form a CA-grafted PU series, with a control PU series containing free CA prepared for comparison. With an increase in the CA content, the enthalpy change during the melting increased for the PU and CPU series, and the glass transition temperature increased with the increase in CA content for the PU series but not for the CPU series. The tensile strengths of the PU series sharply increased with the CA content, whereas those of the CPU series did not. The PU series demonstrated better low-temperature flexibility and water permeability than the unmodified PU.

Analysis of the Low Temperature Performance of Warm Mix Asphalt

2011 ◽  
Vol 71-78 ◽  
pp. 1259-1263
Author(s):  
Hai Jun Wang
Keyword(s):  
Low Temperature ◽  
Warm Mix Asphalt ◽  
Asphalt Binders ◽  
Asphalt Mixes ◽  
Temperature Performance ◽  
The Matrix ◽  
Low Temperature Performance

This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. The warm mix asphalt (WMA) refers to technologies that allow a significant reduction of mixing and compaction temperatures of asphalt mixes through lowering the viscosity of asphalt binders. In this paper, Shell90 # and SK70 # are two matrix asphalt with Sasobit® modifier to prepare for WMA's penetration and ductility, and calculate the equivalent crisp points, evaluate the low temperature performance at 5°C and 15°C, respectively. The results indicate that compared with the Shell90# without and with 5% Sasobit®, its penetration and ductility were reduced by 24.5%, 65.5% at 15°C. For SK70#, its penetration and ductility were reduced by 25.0%, 67.1%. WMA equivalent crisp points test with Shell90 # and SK70 #, compared with the matrix asphalt reduced by 10.03°C and 4.02°C, the addition of 3% Sasobit® to two matrix asphalt binders may also reduce ductility by 22.5% and 26.2%, respectively at 5°C.

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