Relationship of Aggregate Characteristics to the Effect of Water on Bituminous Paving Mixtures

Rice, J M

doi:10.1520/stp39327s

Cited by 20 publications

(15 citation statements)

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“…Generally, it can be seen that the acidic aggregates are more susceptible to stripping than are basic aggregates. This conclusion is shared with corresponding studies of other researchers (35)(36)(37). Of all studied aggregates, the acidic aggregate granite and basic aggregate basalt are more compatible with hydrated lime-modified asphalt binders to resist the stripping of the mixtures.…”

Section: Discussion Of Free Energy Of Adhesionsupporting

confidence: 87%

Moisture Susceptibility Evaluation of Nanosize Hydrated Lime-Modified Asphalt–Aggregate Systems Based on Surface Free Energy Concept

Diab

You

Hossain

et al. 2014

Transportation Research Record

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Moisture susceptibility can cause cohesive and adhesive failures in the asphalt-aggregate system, resulting in serious pavement distresses. The role of regular hydrated lime (RHL) as an antistripping agent in asphalt pavements has been widely addressed with traditional moisture susceptibility evaluation methods. However, the use of nanosize hydrated lime (NHL) in asphalt industries has not yet been initiated. The first objective of this study was to assess the RHL-and NHL-modified asphalt binders on the basis of the surface free energy (SFE) concept by using the Wilhelmy plate method. Advera, a warm-mix asphalt (WMA) foaming additive, was added to the hydrated lime-(RHL and NHL) modified asphalt binders to address the effect of foaming on cohesive bond strength. The NHL material was added with particle sizes of 50 and 100 nanometers. The second objective was to address the adhesive bond strength between the aforementioned asphalt binders and different aggregates. Different acidic and basic aggregates with known SFE components were used along with measured SFE components of the asphalt binders to determine quantitatively the free energy of adhesion in the system. Overall results reveal that SFE components of asphalt binders are dependent on the particle size of hydrated lime. In general, the cohesive bond of the NHL-modified asphalt binder was higher than that of the RHL-modified binder. As hydrated lime particle size decreases, dry and wet adhesive bonds increase. Moisture susceptibility of Advera-foamed mixes seems to depend on aggregate type. The NHL-modified mixes are expected to perform better than RHL-modified mixes in dry and wet conditions.Moisture susceptibility results in deterioration of bonding through cohesive failure within the asphalt, or through adhesive failure at the asphalt-aggregate interface, or both (1). The loss of cohesion is caused primarily by the action of moisture within the asphalt binder, which causes softening and, therefore, loss of mixture stability. The loss of adhesion (i.e., stripping) is caused by the breakage of the interfacial adhesive bond between the aggregate surface and asphalt binder primarily from the action of water and water vapor (2, 3). These failures affect the longevity of the asphalt pavement because the asphalt binder tends to strip from the aggregate surface, leaving the aggregate loose without a binder and, therefore, the asphalt pavement materials (asphalt and aggregate) together. The moisture susceptibility of warm-mix asphalt (WMA) pavements becomes a greater problem than that of hot-mix asphalt because the WMA binders may be softer, and some technologies depend on using water (water-bearing additives and water-based foaming processes) as a workability aid (4-7). The presence of water impairs the bonds and increases the susceptibility to moisture damage. AASHTO T 283, the most commonly used test to quantify moisture susceptibility in the laboratory, does not directly address any mechanisms that govern stripping. The cohesive and adhesive bonds are related t...

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Section: Discussion Of Free Energy Of Adhesionsupporting

confidence: 87%

Moisture Susceptibility Evaluation of Nanosize Hydrated Lime-Modified Asphalt–Aggregate Systems Based on Surface Free Energy Concept

Diab

You

Hossain

et al. 2014

Transportation Research Record

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“…Although many adhesion theories, such as mechanical adhesion (20), chemical adhesion (20,21), and molecular adhesion (22) have been proposed, the interfacial energy theory, which is based upon secondary force (polar and dispersion forces) interactions, is thought to best explain the adhesion of asphalt to aggregate (5,21 (oxide) and an organic adhesive (9,(26)(27)(28).…”

mentioning

confidence: 99%

Development of a technique for in situ measurement of water at the asphaltmodel siliceous aggregate interface

Nguyen¹,

Byrd²,

Bentz³

et al. 1992

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“…The compositions (% by weight) of these elements were obtained in terms of oxides, although oxides may not necessarily naturally occur in aggregates [12]. Contents of potassium, sodium, iron, magnesium, calcium and manganese were got by digesting 200 mg of aggregate samples, ground to pass through 100-mesh sieve, with 10 mL of hydrofluoric acid (conc.…”

Section: Aggregatesmentioning

confidence: 99%

Impact of bitumen and aggregate composition on stripping in bituminous mixtures

2006

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The impact of bitumen and aggregate composition on stripping was investigated using four bitumens and four aggregates. Moisture sensitivity was assessed based on retained resilient modulus and tensile strength ratio (MRR and TSR, respectively). The results indicate that mixtures from the bitumen with a high acid number exhibited high resilient modulus and tensile strength in the dry condition for all the aggregates. In wet condition, this conclusion did also hold except for one aggregate. Regarding penetration grade, mixtures made with lower penetration grade bitumen exhibited higher resilient modulus and tensile strength, in dry and wet conditions, than those of higher penetration grade. Bitumen characteristics like acid number, penetration grade and molecular size distribution did not influence moisture sensitivity. Mixtures with aggregates containing alkali metals (sodium and potassium) exhibited relatively high moisture sensitivity, regardless of the bitumen used. In contrast, indications of moisture sensitivity were not apparent in mixtures made with aggregates containing calcium, magnesium and iron. Data analysis revealed that variability in moisture sensitivity is attributed to aggregate rather than bitumen. No significant interaction effect between bitumen and aggregate was found on moisture sensitivity.

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Relationship of Aggregate Characteristics to the Effect of Water on Bituminous Paving Mixtures

Cited by 20 publications

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Moisture Susceptibility Evaluation of Nanosize Hydrated Lime-Modified Asphalt–Aggregate Systems Based on Surface Free Energy Concept

Moisture Susceptibility Evaluation of Nanosize Hydrated Lime-Modified Asphalt–Aggregate Systems Based on Surface Free Energy Concept

Development of a technique for in situ measurement of water at the asphaltmodel siliceous aggregate interface

Impact of bitumen and aggregate composition on stripping in bituminous mixtures

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