TY - JOUR
T1 - Impact of Additives on Low-Temperature Cracking Properties of Soft Binders Used in Cold Regions
AU - Xie, Zhaoxing
AU - Ali, Ayman
AU - Mehta, Yusuf
AU - Saidi, Ahmed
AU - Chitikela, Sai Venkata Gnaneswari
AU - Bouhrira, Neirouz
AU - Zhuo, Zhuang
AU - Lein, Wade
AU - Decarlo, Christopher
N1 - Publisher Copyright:
© 2020 American Society of Civil Engineers.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Low-temperature cracking is the main distress in asphalt pavement in cold regions (such as the arctic and subarctic regions) as the climate in these areas is severe in winter. While soft asphalt binders (such as PG 52-34 and PG 52-28) are used in the cold regions, asphalt pavements can still exhibit premature cracking failures. One of the approaches to solve this issue is to modify binders using additives. However, it is not clear which additives can significantly improve the thermal cracking resistance of binders. Therefore, there is a need to find potential additives resulting in improved resistance to thermal cracking because of extreme low temperatures experienced in cold regions. In this study, five additives [nano TiO2, nano SiO2, styrene-butadiene-styrene (SBS), ground tire rubber (GTR), and corn oil-based softening agent (SA)] were applied at various dosages with two soft base binders (PG 52-28 and PG 64E-40). Performance properties of modified binders were evaluated using the dynamic shear rheometer (DSR), standard bending beam rheometer (BBR), and modified BBR. The testing results indicated that the combination of a 7% softening agent and 7.5% SBS exhibited the highest improvement in the resistance to thermal cracking. Meanwhile, this combination also resulted in two performance grade bumps at high temperatures. Based on the laboratory testing results, the combination of a softening agent and high SBS could be potential additives to create high-performance binders for cold regions.
AB - Low-temperature cracking is the main distress in asphalt pavement in cold regions (such as the arctic and subarctic regions) as the climate in these areas is severe in winter. While soft asphalt binders (such as PG 52-34 and PG 52-28) are used in the cold regions, asphalt pavements can still exhibit premature cracking failures. One of the approaches to solve this issue is to modify binders using additives. However, it is not clear which additives can significantly improve the thermal cracking resistance of binders. Therefore, there is a need to find potential additives resulting in improved resistance to thermal cracking because of extreme low temperatures experienced in cold regions. In this study, five additives [nano TiO2, nano SiO2, styrene-butadiene-styrene (SBS), ground tire rubber (GTR), and corn oil-based softening agent (SA)] were applied at various dosages with two soft base binders (PG 52-28 and PG 64E-40). Performance properties of modified binders were evaluated using the dynamic shear rheometer (DSR), standard bending beam rheometer (BBR), and modified BBR. The testing results indicated that the combination of a 7% softening agent and 7.5% SBS exhibited the highest improvement in the resistance to thermal cracking. Meanwhile, this combination also resulted in two performance grade bumps at high temperatures. Based on the laboratory testing results, the combination of a softening agent and high SBS could be potential additives to create high-performance binders for cold regions.
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U2 - 10.1061/(ASCE)MT.1943-5533.0003366
DO - 10.1061/(ASCE)MT.1943-5533.0003366
M3 - Article
AN - SCOPUS:85089601755
SN - 0899-1561
VL - 32
JO - Journal of Materials in Civil Engineering
JF - Journal of Materials in Civil Engineering
IS - 10
M1 - 04020290
ER -