Long-Term Aging Performance Analysis of Oil Modified Asphalt Binders

2019 ◽  
Vol 2673 (12) ◽  
pp. 404-412 ◽  
Author(s):  
Albert Kilger ◽  
Daniel Swiertz ◽  
Hussain U. Bahia
Keyword(s):  
Low Temperature ◽  
Engine Oil ◽  
Asphalt Binders ◽  
Creep Recovery ◽  
Aging Effects ◽  
Temperature Performance ◽  
Extended Aging ◽  
Modified Binders ◽  
Low Temperature Performance

Oil modification of asphalt binders is a widely adopted strategy for meeting low temperature performance grade (PG) specifications. There is no shortage of data characterizing the rheological benefits of several oil modifiers. Current AASHTO M320/M332 specifications evaluate low-temperature performance using the bending beam rheometer which measures creep stiffness and relaxation properties of the asphalt binder after 20 h of aging using a pressure aging vessel (PAV). In this study, extended aging effects on oil and polymer modified binders are investigated using three oil-modified binders compared against a control binder using PG and PG+ testing methods. The oils evaluated include bio-oil and re-refined engine oil bottoms. All binders were subjected to a rolling thin film oven and 20-h PAV aging, as well as extended PAV aging of 40 and 60 h. Binders are evaluated using multiple stress creep recovery, AASHTO TP123 dynamic shear rheometry elastic recovery, and linear amplitude sweep tests in addition to standard PG methods. The results show that many of the rheological benefits supplied by the oils tend to diminish after 40 h of PAV aging. However, the long-term effects depend greatly on the type of oil used, as well as the type of polymer modification used. The results suggest that 20-h PAV aging may not be sufficient to predict the long-term performance of the binder, and that extended aging periods (40-h PAV aging) should be considered when selecting oil modified asphalts.

scholarly journals Improving the Low-Temperature Performance of RET Modified Asphalt Mixture with Different Modifiers

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1070
Author(s):  
Cheng Xu ◽  
Zhengqi Zhang ◽  
Feifei Liu
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Creep Recovery ◽  
Dry Process ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Comparison Results ◽  
Beam Bending ◽  
Low Temperature Performance

To improve the low-temperature performance of RET (Reactive Elastomeric Terpolymer) modified asphalt mixture (RETM), polyurethane prepolymer (PUP) was used by wet process, ground waste rubber (GWR) and fibers were used by dry process. Tests of force ductility, bending beam rheometer (BBR), differential scanning calorimeter (DSC), viscosity and multiple stress creep recovery (MSCR) were conducted to study the effects of PUP on the performance of RET modified asphalt (RETA), and beam bending test was conducted to study the effects of GWR and fibers on the performance of RETM. Then, tests of beam bending, wheel tracking, Marshall immersion, freeze-thaw splitting, and economic analysis were further conducted to compare the performance and economy of RETM modified with optimum modifiers suggested. All modifiers improve the low-temperature performance of RETM. PUP content, the content and size of GWR and the content and type of fibers significantly affect the performance of RETA or RETM respectively. After analysis, 10% PUP, 2.1% 80 mesh GWR and 0.2% polyester (PE) fiber are considered as the optimum modifiers, respectively. Comparison results show that optimum modifiers variously improve the low-temperature performance, rutting resistance and moisture susceptibility of RETM, but they slightly reduced the economy of RETM. Comprehensive evaluation shows that 2.1% 80 mesh GWR and 10% PUP are better than 0.2% PE fiber.

Viscoelastic-based approach to evaluate low temperature performance of asphalt binders

2016 ◽  
Vol 128 ◽  
pp. 384-398 ◽  
Author(s):  
H. Jahanbakhsh ◽  
Mohammad M. Karimi ◽  
F. Moghadas Nejad ◽  
Behnam Jahangiri
Keyword(s):  
Low Temperature ◽  
Asphalt Binders ◽  
Temperature Performance ◽  
Low Temperature Performance

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.

Experimental Study on Polyphosphoric Acid (PPA) Modified Asphalt Binders

2010 ◽  
Vol 152-153 ◽  
pp. 288-294 ◽  
Author(s):  
Wei Dong Cao ◽  
Shu Tang Liu ◽  
Hong Lu Mao
Keyword(s):  
Low Temperature ◽  
Softening Point ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Point Test ◽  
Low Temperature Performance ◽  
Four Levels ◽  
Temperature Susceptibility

Polyphosphric acid (PPA) modified asphalt binders were produced in the laboratory using one base asphalt and four levels of PPA contents (0.6%, 1.0%, 1.5% and 2.0% by weight of base asphalt). Penetration test, softening point test, rotation viscosity test, creep test with bending beam rheometer (BBR) and four components test were carried out to study the performance of PPA modified asphalt binders and possible modification mechanism. The results indicate that the high-temperature performance of PPA modified asphalt binders are obviously improved and temperature susceptibility are decreased, but the low-temperature performance slightly decline compared with base asphalt. The PPA content has a very significant effect on softening point whereas it has no significant influence on low-temperature performance according to variance analysis (ANOVA). Finally, four components test reveals that the primary modification mechanism of PPA is the change of chemical composition of asphalt binder.

scholarly journals Evaluation of Low- and Intermediate-Temperature Performance of Bio Oil-Modified Asphalt Binders

2021 ◽  
Vol 13 (7) ◽  
pp. 4039
Author(s):  
Sara A. Alattieh ◽  
Ghazi G. Al-Khateeb ◽  
Waleed Zeiada
Keyword(s):  
Low Temperature ◽  
Asphalt Binder ◽  
Fatigue Cracking ◽  
Asphalt Binders ◽  
Tensile Stresses ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Bio Oil ◽  
Low Temperature Cracking ◽  
Low Temperature Performance

Fatigue cracking and low-temperature cracking are two major distresses that occur in asphalt pavements. Fatigue cracking is a load-associated distress caused by the tensile stresses at the bottom/top of the asphalt concrete (AC) layer due to repeated traffic loading. On the other hand, low-temperature cracking occurs when tensile stresses built up with in the AC layer at low temperatures exceed the tensile strength of that layer. In this study, the performance of date seeds oil bio-modified asphalt binders (DSO-BMB) is evaluated against fatigue and low-temperature cracking. The DSO-BMBs are prepared using volume ratios of 1.5, 2.5, 3.5, 4.5, and 5.5% date seeds oil-to-asphalt binder. The base asphalt binder used in the study is a 60/70-penetration grade with a Superpave performance grade (PG) of PG 64–16. The dynamic shear rheometer (DSR) standard test was used to assess the fatigue performance of the bio-modified binders (BMBs), while the bending beam rheometer (BBR) test was used to test the BMBs for low-temperature performance. In addition, the DSR linear amplitude sweep (LAS) test was used to evaluate the fatigue tolerance behavior of the DSO-BMBs. The analysis and results of the study showed that the bio-oil enhanced the low-temperature performance. The low PG grade improved from −16 °C for the control asphalt binder to −28 °C for the BMB. Additionally, the fatigue resistance of the BMBs was improved as illustrated by the damage–characteristic curves of the modified asphalt binders from the visco-elastic continuum damage (VECD) analysis and the increase in the number of cycles to fatigue failure (Nf).

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