Investigation of binder aging level in short-term-aged PMA mixture with different anti-stripping additives

Sungun Kim, Yeongsam Kim, Wonbae Kim, Kwang Woo Kim4

doi:10.22702/jkai.2019.9.1.004

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Investigation of binder aging level in short-term-aged PMA mixture with different anti-stripping additives

June 2019. pp. 49-57

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Abstract

As an anti-stripping additive (ASA) of hot-mix asphalt (HMA) mixture, the hydrated lime (HL) has been widely used for many years. Conversely, many brands of liquid anti-stripping additive (LA), which properly provide the anti-stripping function, are also used. HL is known to provide anti-aging functions by retarding age-hardening of the binder in addition to ASA functions. However, the LA was not much evaluated or reported regarding anti-aging function. Since the retardation of binder age-hardening is the foundation of many other beneficial functions of asphalt pavements, it is important to investigate whether the anti-aging function is provided by the LA as well. Therefore, this study investigated the anti-aging effects of HL and two liquid additives in SBS-modified SMA mixes in terms of absolute viscosity estimated from large molecular size (LMS) measured by the gel-permeation chromatography (GPC). It was found that two LAs did not provide any retardation of age hardening effects in polymer-modified asphalt mixes, compared with the binder of the mixes with HL and without any ASA. The PMA in one of the LAs showed a significantly higher age-hardening than the one without any ASA. While HL reacted as a significant age-hardening retarder of PMA in SMA mixes. Therefore, it was concluded that there was significant difference in oxidation level due to the use of different ASAs used in this study.

Keywords

Asphalt oxidation

Age retardation

SMA

Hydrated lime

Liquid anti-stripping additives

LMS

Absolute viscosity

References

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Information

Publisher :KOREAN ASPHALT INSTITUTE
Publisher(Ko) :한국아스팔트학회
Journal Title :Journal of the Korean Asphalt Institute
Journal Title(Ko) :한국아스팔트학회지
Volume : 9
No :1
Pages :49-57
Received Date :2019. 06. 21
Accepted Date : 2019. 06. 26
DOI :https://doi.org/10.22702/jkai.2019.9.1.004

Journal of the Korean Asphalt Institute ISSN:2234-0785(Print) 2635-9553(Online) 한국아스팔트학회지

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