This patent describes a cost-effective foamed bitumen process to be applied for cold recycling of aged flexible road pavements. Additionally, the base bitumen used is in-situ modified during the process and, consequently, both low and high temperature properties result remarkably improved. Finally, waste gypsum and phosphogypsum are preferably used to form the foam
New and innovative aspects
This is the only patented technology that, at the same time, produces a foamed bitumen and is able to modify the binder. The obtained foam presents a much better stability than other foamed bitumens technologies and the mineral aggregates coating is also imporved. In addition, this procedure uses waste gypsum and phosphogypsum contributing to solve an important environmental problem
Main advantages of its use
Economic advantages: this technology uses only low cost material. Cold recycling implies less fuel consumption Technological advantages: the technology can be applied in-situ. There is no need of water injection and consequently is more simple and safer. Environmental advantages: contributes to reuse waste materials (phosphogypsum)
Specifications
Compared to traditional processes, the Half-life time (τ½) is improved in a factor of ten (e.g 9s for a traditions and 130 s for this technology. Technological characteristics of the base bitumen as ring and ball softening point and penetration (40 dmm and 52ºC) are also improved (21 dmm and 69ºC respectively). Characteristic glass transition temperatures of bitumen (-30 and 3.5ºC) are shift to lower values (-32 and -5ºC)
Applications
The Technology Transfer Office (TTO) is a service of the University of Huelva attached to the Vice-chancellor of Research, Postgraduate and International Relations. Its mission is to get companies and institutions in Huelva are scientifically advanced entities, by encouraging close collaboration in R&D between researchers, enterprises, and institution
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