The influence of aggregate, filler and bitumen on asphalt mixture moisture damage

Airey, Gordon; Collop, Andy; Zoorob, Salah E.; Elliott, Richard

doi:10.1016/j.conbuildmat.2007.07.009

Cited by 194 publications

(89 citation statements)

References 9 publications

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“…They are composed largely of silicon and oxygen, with the addition of ions such as aluminium, magnesium, iron and calcium. Due to the acidic nature of bitumen, this type of siliceous aggregate is well known for its poor field moisture damage performance [27,28]. Before being used, the aggregates were washed with deionized water and then dried in an oven at 105 ± 5 ºC overnight.…”

Section: Methodsmentioning

confidence: 99%

Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates

Cuadri¹,

Partal²,

Ahmad

et al. 2015

Construction and Building Materials

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Moisture damage is one of the major premature failures that worsens the performance and shortens service life of pavements. This research assesses the effect that two chemical modifiers (thiourea and an isocyanate-functionalized castor oil prepolymer) exerts on the bitumen rheology and on the resistance to potential moisture damage of asphalt mixtures based on siliceous aggregates. Both thiourea and the isocyanate-based prepolymer improve the viscous and viscoelastic behaviours of bitumen at high inservice temperatures, particularly the isocyanate-based reactive modifier. Likewise, the visual inspection of the degree of bitumen coating on loose mixtures exposed to water in a "rolling bottle" test, and further surface free energy measurements, showed that the bitumen modification by the isocyanate-based prepolymer seems to reduce moistureinduced damage on siliceous aggregates. Conversely, thiourea-based modification increases sensitivity of the bitumen-aggregate mixture to water. Different adhesion mechanisms, based on chemical or physical bonds with the aggregate surface, have been proposed for each modifier.

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Section: Methodsmentioning

confidence: 99%

Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates

Cuadri¹,

Partal²,

Ahmad

et al. 2015

Construction and Building Materials

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show abstract

“…The stripping phenomenon has been firmly attributed to the presence of residual water as a principal consequence of adhesion failure of bitumen onto aggregates [20][21][22][23]. It has also been ascertained that mineralogy (rock chemical composition), surface texture, absorption, surface ageing, surface coatings, and particle shape can affect the efficiency of an adhesive bond in an asphaltaggregate mixture [24,25].…”

Section: The Structure Of Bitumen and Its Interaction With Mineral Agmentioning

confidence: 99%

Adhesion Promoters in Bituminous Road Materials: A Review

Rossi

Teltayev²,

Angelico

2017

Applied Sciences

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Featured Application:The adhesion between aggregate and bitumen is crucial in asphalt pavements and has a strong influence on the service time of the road. Thus, the addition of adhesion promoters is gaining importance, particularly with regard to emerging and more sustainable technologies for asphalt production, which aim to reduce the working temperature, save energy, and guarantee the safety of specialized personnel. The present work offers an overview on physical and chemical properties of most common types of adhesion promoters currently used in asphalt industry and tries to build a bridge between scientific research and technological application.Abstract: This review focuses on certain classes of organic compounds known variously in the specific literature of asphalt as adhesion promoters, antistripping agents, wetting agents, antistrips, or adhesion agents. These kinds of organic additives are currently formulated to enhance the bitumen coating of mineral aggregates and improve the workability of asphalt mixtures. In this review, the term "adhesion promoters" includes both synthetic organic compounds as well as those extracted from natural resources, mixed in trace amounts to bitumen. Their main role is to alter the interfacial energy, so that the presence of water, even in trace, does not weaken the bitumen-aggregate bond and tends to favor adhesion. The report also considers the chemical functionalities that play a predominant role in bonding, as well as the effects of surface modification of the aggregate due to the presence of adhesion promoters in pre-blended bituminous mixtures. Although bitumen is widely used in road pavement construction and the discussion is mainly addressed to the improvement of adhesion in road materials, adhesion and wetting properties can also represent a general issue in various bitumen-based industrial products.

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“…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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The influence of aggregate, filler and bitumen on asphalt mixture moisture damage

Cited by 194 publications

References 9 publications

Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates

Chemically modified bitumens with enhanced rheology and adhesion properties to siliceous aggregates

Adhesion Promoters in Bituminous Road Materials: A Review

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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