Classical and Contemporary Aspects of Stripping in Bituminous Mixes

Bagampadde, Umaru; Isacsson, Ulf; Kiggundu, Badru M

doi:10.1080/14680629.2004.9689961

Cited by 66 publications

(21 citation statements)

References 19 publications

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“…As a consequence, only the remaining non-acidic surfactants of the bitumen can move to the bitumen-aggregate interface (Bagampadde et al, 2004;Stuart, 1990). These other surfactants are typically amine based (Durrieu, 1977) and are not easily displaced by water, unlike anionic surfactants (Curtis et al, 1993;Stuart, 1990).…”

Section: Chemical Interaction With the Bitumenmentioning

confidence: 99%

The mechanisms of hydrated lime modification of asphalt mixtures: a state-of-the-art review

Lesueur

Petit²,

Ritter

2012

Road Materials and Pavement Design

223

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Although already known for a long time, hydrated lime (HL) attracted a strong interest as an asphalt additive during the 1970s in the USA, when moisture damage and frost became some of the most pressing pavement failure modes of the time. Given its extensive use in the past 40 years, HL is known to be more than a moisture damage additive: it is an "active filler" that also reduces the chemical ageing of the bitumen and stiffens the mastic more than a normal mineral filler above room temperature. These properties impact durability, and HL is now seen as an additive that increases asphalt mixture durability. This article is a literature review on the fundamentals of the effect of HL on asphalt mixtures. The reasons for it being so effective lie in the strong interactions between both the aggregate and the bitumen and a combination of four mechanisms, two on the aggregate and two on the bitumen. HL modifies the surface properties of the aggregate, allowing for the development of surface composition and roughness more favourable to bitumen adhesion. Then, HL can treat the existing clayey particles adhering to the aggregate surface, inhibiting their detrimental effect on the mixture. Also, HL reacts chemically with the acids of the bitumen, which in turn slows down the age hardening kinetics and neutralises the effect of the "bad" adhesion promoters originally present inside the bitumen, enhancing the moisture resistance of the mixture. Finally, the high porosity of HL explains its stiffening effect above room temperature.

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Section: Chemical Interaction With the Bitumenmentioning

confidence: 99%

The mechanisms of hydrated lime modification of asphalt mixtures: a state-of-the-art review

Lesueur

Petit²,

Ritter

2012

Road Materials and Pavement Design

223

View full text Add to dashboard Cite

show abstract

“…Silane coupling agents and sulfur based additives were also used to help anti-stripping [188][189][190]. Polymers, however, have the advantage of utilizing the desirable properties of different functional groups in the same molecule [191] and have the possibility to help enhancing aggregates adhesion. Although some of the ordinary polymer modifiers (e.g.…”

Section: Future Developmentsmentioning

confidence: 99%

Polymer modification of bitumen: Advances and challenges

Zhu

Birgisson

Kringos

2014

European Polymer Journal

751

287

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Abstract. Advances and challenges in the field of bitumen polymer modification for road construction during the last 40 years are reviewed in this paper. The history of bitumen polymer modification is described chronologically. Some popular plastomers and thermoplastic elastomers in bitumen modification are discussed regarding their advantages and disadvantages, including polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate (EVA), ethylene-butyl acrylate (EBA), styrene-butadiene-styrene (SBS), styrene-isoprenestyrene (SIS) and styrene-ethylene/butylene-styrene (SEBS). Although these polymers all improve bitumen properties to some extent, there are still some drawbacks limiting the future development of bitumen polymer modification, such as high cost, low ageing resistance and poor storage stability of polymer modified bitumen (PMB). Researchers attempted various ways to remove these drawbacks. Some technical developments for removing drawbacks are reviewed in this paper, including saturation, sulfur vulcanization, adding antioxidants, using hydrophobic clay minerals, functionalization and application of reactive polymers. The future development of polymers for bitumen modification is analyzed as well. Since it is currently challenging to perfectly achieve all expected PMB properties at the same time, some compromised recommendations are given in this paper, among which greatly enhancing the properties with an acceptably high cost, significantly reducing the cost with relatively poor properties and their combinations. Functionalization is emphasized as a promising way to enhance the properties of currently used polymers and develop new-type polymer modifiers with much greater success in the future. It is also recommended that future research on bitumen polymer modification focuses more on function development towards enhancing: adhesion with aggregates, long-term performance and recyclability.

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“…However, the most accepted hypothesis is that the aggregate surface chemistry is the main responsible of the stripping process (7,11). Fromm (12) reported that stripping is high in mixes with acidic granites with hydroxylated SiO 4 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the combination of freeze-thawing and salting causes either the interfacial damage between binder and aggregate or the fracture of the binder, which produces a greater increase of weight loss (4)(5). The latter is considered the main cause of asphalt pavement deterioration, and it is directly related to the low adhesion between the aggregate and the binder in asphalt mixtures (6)(7)(8)(9). However, the mechanisms which produce the low adhesion between the aggregates and the binder are still unclear.…”

Section: Introductionmentioning

confidence: 99%

Utilización de técnicas petrográficas para evaluar los efectos inducidos del NaCl, condiciones climáticas extremas y el paso del tráfico en las superficies de las carreteras españolas

2017

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ABSTRACT:The asphalt surface layer is the most exposed to weather and traffic conditions on roads, especially those subjected to winter maintenance. Therefore, a deep knowledge of the mechanisms which can damage this layer is necessary to improve its design, construction and long-term use. With this purpose, two types of asphalt mixtures used on roads from NW Spain were subjected to durability tests (freezing-thaw and thermal-stress) with a saturated NaCl solution. After the durability tests, a wheel tracking test was performed on the samples, and the resultant material was analyzed by optical polarized light and fluorescence microscopy. This analysis showed that the binder-aggregate low adhesion was the main responsible of the asphalt mixture damage. This damage was concentrated in the aggregates because the binder acted as an impermeable wall. Consequently, the NaCl solution penetrated and degraded the aggregates quickly and strongly. RESUMEN: Utilización de técnicas petrográficas para evaluar los efectos inducidos del NaCl, condiciones climáti-cas extremas y el paso del tráfico en las superficies de las carreteras españolas.Las capas de rodadura son las más expuestas al clima y al efecto del tráfico, especialmente en carreteras sometidas a mantenimiento invernal. Por este motivo, es importante conocer mejor los mecanismos de deterioro de dichas capas a la hora de mejorar su diseño, construcción y uso a largo plazo. Con este fin, dos tipos de mezclas asfálticas utilizadas en el NO de España fueron expuestas a ensayos de durabilidad (heladicidad y choque térmico) con una solución saturada de NaCl. Después, se realizó el ensayo de pista y el material deteriorado y deformado resultante fue analizado mediante microscopia óptica de luz polarizada y de fluorescencia. Dicho análisis mostró que el principal responsable de la degradación de la mezcla fue la baja adhesión árido-betún. Esta degradación se concentró en el árido debido a que el ligante actuó como una pared impermeable. En consecuencia, la solución de NaCl pudo penetrar y degradar rápida e intensamente el árido.

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Classical and Contemporary Aspects of Stripping in Bituminous Mixes

Cited by 66 publications

References 19 publications

The mechanisms of hydrated lime modification of asphalt mixtures: a state-of-the-art review

The mechanisms of hydrated lime modification of asphalt mixtures: a state-of-the-art review

Polymer modification of bitumen: Advances and challenges

Utilización de técnicas petrográficas para evaluar los efectos inducidos del NaCl, condiciones climáticas extremas y el paso del tráfico en las superficies de las carreteras españolas

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