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Storage stability is a very important parameter that has to be considered in the formulation of asphalt emulsions. When monomodal emulsions are formulated, Stokes' law is fulfilled, therefore the higher the viscosity the less sedimentation, or the lower average droplet size the less sedimentation. But when bimodal emulsions are formulated, this rule does not apply. In this paper, two types of different emulsions are formulated: monomodal emulsions and bimodal emulsions. Bimodal emulsions are a combination of one large bitumen size and a small one. For this study, hard penetration bitumens were used, B35/50 and B15/25, because they are the most difficult bitumen to emulsify and, consequently, the worst sedimentation values are expected. Once the emulsions are manufactured, they are diluted to a bitumen rate concentration of 60% and 70%. Results show that bimodal emulsions, although having lower viscosity than their monomodal counterparts, have higher storage stability.
The authors would like to thank the Catalan Government for the quality accreditation given
to their research group GREA (2014 SGR 123). GREA is certified agent TECNIO in the category of technology
developers from the Government of Catalonia. Camila Barreneche would like to thank Ministerio de Economia y
Competitividad de España for Grant Juan de la Cierva, FJCI-2014-22886 and Núria Querol would like to specially
thank Sorigue Company for giving her the opportunity to develop this study using its manufacture production
plant equipped with the most advanced technology to develop this kind of emulsions. |
