Rheological Property Evaluation and Microreaction Mechanism of Rubber Asphalt, Desulfurized Rubber Asphalt, and Their CompositesSource: Journal of Materials in Civil Engineering:;2021:;Volume ( 033 ):;issue: 006::page 04021100-1DOI: 10.1061/(ASCE)MT.1943-5533.0003688Publisher: ASCE
Abstract: Desulfurized rubber asphalt (DRA) is a good environmentally friendly road construction material, but its high-temperature performance is relatively insufficient compared to ordinary rubber asphalt (RA). Therefore, in order to make full use of its environmental protection features and overcome its shortcomings in high-temperature performance, polyphosphoric acid (PPA) was used to modify DRA to prepare composite modified asphalt (PPA-DRA). First, RA, DRA, and PPA-DRA were prepared in this study, and their high-temperature performance and fatigue properties were compared and analyzed by a temperature scanning test and multistress creep recovery test (MSCR). Then, their low-temperature performance was also compared and analyzed by using a bending beam rheological test (BBR). Finally, the modified mechanism of PPA-DRA was revealed by the FTIR test, thermogravimetric analysis (TGA), and microswelling model. Results show that compared to RA and DRA, PPA-DRA performed better both at high and low temperatures but worse at fatigue resistance, and it can be applied to a wider range of traffic grades. However, PPA-DRA and DRA are more susceptible to aging than RA, and the elastic component in PPA-DRA increases greatly due to aging. According to the strategic highway research program (SHRP) specification, PPA-DRA, DRA, and RA can be graded as PG82-34, PG76-28, and PG76-28, respectively. Also, the FTIR test in conjunction with TGA proves that PPA-DRA exhibits better high-temperature performance than DRA and RA from the microscopic perspective, and its modification process is of chemical modification; the swelling model shows that compared to RA and DRA, PPA-DRA shows the largest number of micelles and the best combination between modifier and asphalt molecules, which promotes the formation of a dense spatial network structure and makes the asphalt structure more stable.
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contributor author | Ying Fang | |
contributor author | Zhengqi Zhang | |
contributor author | Kaiwen Zhang | |
contributor author | Zhuolin Li | |
date accessioned | 2022-01-31T23:35:12Z | |
date available | 2022-01-31T23:35:12Z | |
date issued | 6/1/2021 | |
identifier other | %28ASCE%29MT.1943-5533.0003688.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4269993 | |
description abstract | Desulfurized rubber asphalt (DRA) is a good environmentally friendly road construction material, but its high-temperature performance is relatively insufficient compared to ordinary rubber asphalt (RA). Therefore, in order to make full use of its environmental protection features and overcome its shortcomings in high-temperature performance, polyphosphoric acid (PPA) was used to modify DRA to prepare composite modified asphalt (PPA-DRA). First, RA, DRA, and PPA-DRA were prepared in this study, and their high-temperature performance and fatigue properties were compared and analyzed by a temperature scanning test and multistress creep recovery test (MSCR). Then, their low-temperature performance was also compared and analyzed by using a bending beam rheological test (BBR). Finally, the modified mechanism of PPA-DRA was revealed by the FTIR test, thermogravimetric analysis (TGA), and microswelling model. Results show that compared to RA and DRA, PPA-DRA performed better both at high and low temperatures but worse at fatigue resistance, and it can be applied to a wider range of traffic grades. However, PPA-DRA and DRA are more susceptible to aging than RA, and the elastic component in PPA-DRA increases greatly due to aging. According to the strategic highway research program (SHRP) specification, PPA-DRA, DRA, and RA can be graded as PG82-34, PG76-28, and PG76-28, respectively. Also, the FTIR test in conjunction with TGA proves that PPA-DRA exhibits better high-temperature performance than DRA and RA from the microscopic perspective, and its modification process is of chemical modification; the swelling model shows that compared to RA and DRA, PPA-DRA shows the largest number of micelles and the best combination between modifier and asphalt molecules, which promotes the formation of a dense spatial network structure and makes the asphalt structure more stable. | |
publisher | ASCE | |
title | Rheological Property Evaluation and Microreaction Mechanism of Rubber Asphalt, Desulfurized Rubber Asphalt, and Their Composites | |
type | Journal Paper | |
journal volume | 33 | |
journal issue | 6 | |
journal title | Journal of Materials in Civil Engineering | |
identifier doi | 10.1061/(ASCE)MT.1943-5533.0003688 | |
journal fristpage | 04021100-1 | |
journal lastpage | 04021100-12 | |
page | 12 | |
tree | Journal of Materials in Civil Engineering:;2021:;Volume ( 033 ):;issue: 006 | |
contenttype | Fulltext |