Characterization of warm mix asphalt binders containing artificially long-term aged binders

Lee, Soon‐Jae; Amirkhanian, Serji; Park, Nam-Won; Kim, Kwang W.

doi:10.1016/j.conbuildmat.2008.11.005

Cited by 91 publications

(41 citation statements)

References 5 publications

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“…They have been increasingly used in the asphalt industry around the globe over the last few decades. The main advantages of warm-mix asphalt (WMA) mixtures are lower energy consumption during mixing and compaction and therefore, lower greenhouse gas emissions (Kim, Lee, & Amirkhanian, 2010;Lee, Amirkhanian, Park, & Kim, 2009). They are seen as a more energy efficient, sustainable way for road construction (Hofko, Dimitrov, et al, 2016).…”

Section: Road Materials and Pavement Designmentioning

confidence: 99%

Effect of short-term ageing temperature on bitumen properties

Hofko

Falchetto

Grenfell

et al. 2017

Road Materials and Pavement Design

111

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Properties of asphalt mixtures after ageing are fundamental parameters in determining longterm performance (e.g. durability) of these materials. With increasing popularity of reduced temperature mixtures, such as warm-mix asphalt, WMA, the question remains how a reduction in short-term ageing affects the properties after long-term ageing of bituminous materials. This paper aims to improve our understanding of the effect of asphalt manufacturing temperature on ageing and the resulting mechanical properties of bituminous binder by studying the effect of short-and long-term ageing of different bitumen samples as a function of short-term ageing temperatures. For this purpose, round robin experiments were conducted within the RILEM technical committee (TC) 252 chemo-mechanical characterisation of bituminous materials by 10 laboratories from 5 countries using four binders of the same grade (70/100 pen) from different crude sources. The short-term ageing was carried out using the standard procedure for rolling thin film oven test (RTFOT), but varying the temperatures. Long-term ageing was carried out using the standard procedure for pressure aging vessel (PAV) in addition to RTFOT. For the mechanical characterisation, rheological data were determined by using the dynamic shear rheometer (DSR) and conventional tests, with needle penetration and softening point using the ring and ball method. The results show that although different short-term ageing temperatures showed a significant difference in the mechanical properties of the binders, these differences vanished after long-term ageing with PAV.Keywords: bitumen; DSR; long-term ageing; short-term ageing; asphalt; RTFOT; PAV IntroductionAs an organic material, bitumen undergoes changes in its mechanical characteristics, chemical composition and microstructure due to environmental effects over its lifetime (Glotova, Gorshkov, Kats, Shapiro, & Yureva, 1980;Lee, Tia, Ruth, & Page, 1997;Mills-Beale et al., 2012;Yao, Dai, & You, 2015). Loss of volatile components at elevated temperatures and oxidation are two main factors for these changes. In terms of mechanical properties, bitumen tends to become stiffer, more elastic and brittle over time. Road Materials and Pavement Design109 SARA (saturates, aromatics, resins and asphaltenes) fractions can be observed with an increasing amount of asphaltenes and decreasing amount of aromatics over time Lu & Isacsson, 2002). These changes are generally summarised under the term "ageing". Bitumen ageing can be split up into short-term and long-term ageing. In the case of hot mix asphalt, short-term ageing occurs during asphalt mix production, transport and compaction at the construction site, all of which happens within hours. It is characterised by relatively high temperatures ( > 130°C) and thus, high oxidation rates. Long-term ageing occurs in asphalt pavements in the field as a result of exposure to traffic and climatic conditions during its service life. Compared to short-term ageing, long-term ageing is a slow oxidation process tha...

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Section: Road Materials and Pavement Designmentioning

confidence: 99%

Effect of short-term ageing temperature on bitumen properties

Hofko

Falchetto

Grenfell

et al. 2017

Road Materials and Pavement Design

111

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“…The results of studies by Amirkhanian and Akisetta [36,37], indicate an increase in PG 64-22 bitumen's viscosity after using 0.6% of Aspha-Min zeolite (by weight of the binder). The reference material in their publication included PG 64-22 asphalts of several crude sources.…”

Section: Effect Of Zeolite Addition On Asphalt Viscositymentioning

confidence: 96%

A Review of the Application of Zeolite Materials in Warm Mix Asphalt Technologies

Woszuk

Franus

2017

Applied Sciences

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Among warm mix asphalt (WMA) technologies, asphalt foaming techniques offer high potential in terms of decreasing production temperature. Reluctance of manufacturers to introduce this technology is connected with the concerns of a large investment costs. However, there are known additives which, through asphalt foaming, allow a decrease in temperatures by approximately 30 • C; the use of these additives do not involve expensive investment in order to change the asphalt mix production method. These additives are zeolites, that is, minerals of the aluminosilicate group, the crystalline structure of which contains water bound in a specific way. Its release, at mix asphalt production temperatures, causes asphalt foaming. It is currently known that zeolites can be used in WMA, including natural and synthetic zeolites obtained using chemical reagents and waste. This review presents the results of studies of WMA technology, including the effects of zeolite addition on asphalt properties and mix asphalt, as well as related environmental, economic, and technological benefits.

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“…The first is the use of a lower Sasobit ® content in the asphalt binder, and the second is the use of a low-viscosity virgin binder. An experimental study showed that the use of low-viscosity virgin asphalt binder was effective in mitigating the increase in asphalt binder stiffness due to WMA additives in long-term-aged binders 36 .…”

Section: Selection Of Appropriate Percentage Of Sasobit ®mentioning

confidence: 99%

Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures

2012

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This paper describes the rheological properties of PG64, PG70, and PG76 asphalt binders blended with different Sasobit ® contents. The rheological properties of the Sasobit ® -modified binders were characterized after being subjected to different aging conditions using the dynamic shear rheometer (DSR) and rotational viscometer (RV) according to Superpave TM test protocols. The results indicated that the characterization of aging in terms of the Aging Index (AI) depends on the rheological property of the asphalt binder selected for use in evaluating aging, the amount of Sasobit ® , the binder type, and the temperature range. Linear relationships between failure temperatures of unaged and short-term-aged asphalt were observed for three binder types. Design charts were developed to select the appropriate Sasobit ® content as a function of temperature, taking into consideration the stiffening effects of Sasobit ® , using the Superpave TM fatigue factor and asphalt mix construction temperatures.

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Characterization of warm mix asphalt binders containing artificially long-term aged binders

Cited by 91 publications

References 5 publications

Effect of short-term ageing temperature on bitumen properties

Effect of short-term ageing temperature on bitumen properties

A Review of the Application of Zeolite Materials in Warm Mix Asphalt Technologies

Effects of Sasobit® content on the rheological characteristics of unaged and aged asphalt binders at high and intermediate temperatures

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