Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures

The use of rejuvenators has enhanced the workability of asphalt mixtures containing the reclaimed asphalt pavement (RAP). This conclusion is based on the determination of viscosity of asphalt binders, while not validated from reclaimed asphalt mixtures. In this study, the effect of two rejuvenators...

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Autores principales:	Wei Tang, Xin Yu, Ning Li, Fuqiang Dong, Zhongyuan Wang, Yu Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	RAP reclaimed asphalt mixture workability performance emulsified rejuvenator Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/9b7c76bc572e4023bda0f70bdf9b6e6d
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spelling	oai:doaj.org-article:9b7c76bc572e4023bda0f70bdf9b6e6d2021-11-11T17:57:31ZEffect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures10.3390/ma142163851996-1944https://doaj.org/article/9b7c76bc572e4023bda0f70bdf9b6e6d2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6385https://doaj.org/toc/1996-1944The use of rejuvenators has enhanced the workability of asphalt mixtures containing the reclaimed asphalt pavement (RAP). This conclusion is based on the determination of viscosity of asphalt binders, while not validated from reclaimed asphalt mixtures. In this study, the effect of two rejuvenators (ordinary and emulsified rejuvenator) on the workability of reclaimed asphalt mixtures was evaluated by measuring the mixing torque and determining the air void content of reclaimed mixtures. In addition, their effects on the performances of reclaimed mixture were studied via the three indexes tests, rutting test and freeze-thaw splitting tests. The experimental results show that mixing torque and air void content of reclaimed mixtures with the emulsified rejuvenator is 4% and 6% lower than that with the ordinary rejuvenator, respectively. This indicates that improvement of the workability of reclaimed mixtures can be achieved by using an emulsified rejuvenator, but not by an ordinary rejuvenator. That is also the reason that at least 20% greater high-temperature stability is found for reclaimed mixtures by using the emulsified rejuvenator than using the ordinary rejuvenator. In addition, reclaimed mixtures with the emulsified rejuvenator show similar moisture susceptibility to that with the ordinary rejuvenator. This study provides a feasible method to assess the workability effect of rejuvenators on reclaimed mixtures directly and recommends the use of an emulsified rejuvenator to improve the workability and high-temperature stability of reclaimed mixtures.Wei TangXin YuNing LiFuqiang DongZhongyuan WangYu ZhangMDPI AGarticleRAPreclaimed asphalt mixtureworkabilityperformanceemulsified rejuvenatorTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6385, p 6385 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	RAP reclaimed asphalt mixture workability performance emulsified rejuvenator Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	RAP reclaimed asphalt mixture workability performance emulsified rejuvenator Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Wei Tang Xin Yu Ning Li Fuqiang Dong Zhongyuan Wang Yu Zhang Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures
description	The use of rejuvenators has enhanced the workability of asphalt mixtures containing the reclaimed asphalt pavement (RAP). This conclusion is based on the determination of viscosity of asphalt binders, while not validated from reclaimed asphalt mixtures. In this study, the effect of two rejuvenators (ordinary and emulsified rejuvenator) on the workability of reclaimed asphalt mixtures was evaluated by measuring the mixing torque and determining the air void content of reclaimed mixtures. In addition, their effects on the performances of reclaimed mixture were studied via the three indexes tests, rutting test and freeze-thaw splitting tests. The experimental results show that mixing torque and air void content of reclaimed mixtures with the emulsified rejuvenator is 4% and 6% lower than that with the ordinary rejuvenator, respectively. This indicates that improvement of the workability of reclaimed mixtures can be achieved by using an emulsified rejuvenator, but not by an ordinary rejuvenator. That is also the reason that at least 20% greater high-temperature stability is found for reclaimed mixtures by using the emulsified rejuvenator than using the ordinary rejuvenator. In addition, reclaimed mixtures with the emulsified rejuvenator show similar moisture susceptibility to that with the ordinary rejuvenator. This study provides a feasible method to assess the workability effect of rejuvenators on reclaimed mixtures directly and recommends the use of an emulsified rejuvenator to improve the workability and high-temperature stability of reclaimed mixtures.
format	article
author	Wei Tang Xin Yu Ning Li Fuqiang Dong Zhongyuan Wang Yu Zhang
author_facet	Wei Tang Xin Yu Ning Li Fuqiang Dong Zhongyuan Wang Yu Zhang
author_sort	Wei Tang
title	Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures
title_short	Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures
title_full	Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures
title_fullStr	Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures
title_full_unstemmed	Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures
title_sort	effect of rejuvenators on the workability and performances of reclaimed asphalt mixtures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9b7c76bc572e4023bda0f70bdf9b6e6d
work_keys_str_mv	AT weitang effectofrejuvenatorsontheworkabilityandperformancesofreclaimedasphaltmixtures AT xinyu effectofrejuvenatorsontheworkabilityandperformancesofreclaimedasphaltmixtures AT ningli effectofrejuvenatorsontheworkabilityandperformancesofreclaimedasphaltmixtures AT fuqiangdong effectofrejuvenatorsontheworkabilityandperformancesofreclaimedasphaltmixtures AT zhongyuanwang effectofrejuvenatorsontheworkabilityandperformancesofreclaimedasphaltmixtures AT yuzhang effectofrejuvenatorsontheworkabilityandperformancesofreclaimedasphaltmixtures
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Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures

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