Rupturing of bitumen-in-water emulsions: experimental evidence for viscous sintering phenomena

Bonakdar, L.; Philip, John; Bardusco, P.; Petkov, Jordan T.; Potti, Juan José; Méléard, Philippe; Leal-Calderón, Fernando

doi:10.1016/s0927-7757(00)00699-3

Cited by 21 publications

(23 citation statements)

References 9 publications

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“…The droplet shrinkage is very rapid in the early stages of coalescence and bridge contact 'r b ' grows linear with time for all three binders, which also agrees with the Finite Element based theoretical calculations of Martinez-Herera and Derby [20]. Moreover, if ratios between surface energy and viscosity ( /Á) of each binder are compared, soft binder will have higher values as compared to the harder binder grade, which explains the extremely fast and extremely low relaxation process respectively [37]. So far, our method has been tested for the same penetration grade binder but from three different (chemical) origins.…”

Section: Coalescence Of Bitumen Drops In Water (New Setup Design)supporting

confidence: 83%

“…As such, they can only lead to comparative conclusions but never lead to any real systematic improvement of the design of the emulsions nor enable the optimization for varying storage, field or production conditions. Several researchers [35][36][37][38] have proposed that breaking of bitumen emulsions resembles the classical sintering process known in ceramics, latex paints and aerogels. After adding the breaking additive or destabilizing agent to the emulsion, a gel or network forms which further contracts and becomes a separate phase.…”

Section: Breaking and Coalescencementioning

confidence: 99%

“…Moreover, surface free energies of both bitumen and the substrate are also equally important for the wettability (coating and adhesion) as well as relaxation process (coalescence or cohesion). The ratios between surface energy and viscosity ( /Á) of each binder can be used to predict the rate of relaxation or an estimate for the average relaxation time [37].…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

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Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets

Khan

Redelius²,

Kringos

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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This is the published version of a paper published in Colloids and Surfaces A: Physicochemical and Engineering Aspects. Citation for the original published paper (version of record):Khan, A., Redelius, P., Kringos, N. (2016) Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets. Colloids and Surfaces• A new experimental method to study coalescence of two bitumen droplets is presented.• The developed test procedure is a novel state of art, quite simple and repeatable.• It is possible to study the coalescence process in bitumen emulsions on a large scale.• This method will serve its widespread applicability in cold mix asphalt technology. Cold mix asphalt (CMA) emulsion technology could become an attractive alternative for the road industry due to low startup and equipment installation costs, diminished energy consumption and reduced environmental impact. The performance of cold asphalt mixtures produced from emulsions is strongly influenced by a good control of the breaking and coalescence process. The wetting of bitumen on the surface of the aggregates is hereby of major importance for the performance of the asphalt. Premature coalescence of the bitumen emulsions away from the surface, could lead to poor adhesion and decreased mechanical strength of the asphalt. Today, the breaking and coalescence mechanisms of bitumen emulsions are still not fully understood due to their complexities and the lack of fundamental experimental methods and existing models. However, in the past years efforts have been made in defining relationships for understanding the bitumen emulsions. In this paper, a new experimental method is presented to study coalescence of bitumen by using shape relaxation of bitumen droplets in an emulsion environment. The coalescence of spherical droplets of different bitumen have been correlated with neck growth, densification and surface area change during the coalescence process. The test protocol was designed in a controlled climate chamber, to study the coalescence process with varying environmental conditions. The kinetics of the relaxation process was influenced by the temperature as well as other parameters. * Corresponding author. The research showed that the developed test procedure is repeatable and able to study the coalescence process on a larger scale. However, the relationship between the measured parametric relationships at the larger scale and the bitumen emulsion scale still needs further investigation. g r a p h i c a l a b s t r a c t a r t i c l e i n f o

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Section: Coalescence Of Bitumen Drops In Water (New Setup Design)supporting

confidence: 83%

Section: Breaking and Coalescencementioning

confidence: 99%

Section: Contact Angle Measurementsmentioning

confidence: 99%

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Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets

Khan

Redelius²,

Kringos

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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show abstract

“…Droplets formed in the absence of surfactants lack the necessary electrostatic repulsion, i.e., no charges are introduced, or steric repulsion, i.e., with polymers or nonionic surfactants,20,21 and they become unstable and coalesce. By adding surfactant, the droplets become more stable with regard to fusion and flocculation.…”

Section: Discussionmentioning

confidence: 99%

Micropipette manipulation: A technique to evaluate the stability of water‐in‐oil emulsions containing proteins

Jørgensen

Kim

Vermehren

et al. 2004

Journal of Pharmaceutical Sciences

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“…Note that very stable milk of lime with 45% solid fraction is now available and is being used as an emulsion breaking agent in microsurfacings or even tack coats. When the emulsion breaks by gel contraction, the kinetics of binder film formation is governed by three parameters (Bonakdar et al, 2001):…”

Section: Breaking Of Pmbementioning

confidence: 99%

Polymer modified bitumen emulsions (PMBEs)

Lesueur

2011

Polymer Modified Bitumen

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Rupturing of bitumen-in-water emulsions: experimental evidence for viscous sintering phenomena

Cited by 21 publications

References 9 publications

Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets

Toward a new experimental method for measuring coalescence in bitumen emulsions: A study of two bitumen droplets

Micropipette manipulation: A technique to evaluate the stability of water‐in‐oil emulsions containing proteins

Polymer modified bitumen emulsions (PMBEs)

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