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Innovative materials for pavements in transportation infrastructures

Keywords: pavements, recycling, End-of-Life Tires (ELT), Construction and Demolition (C&D), geopolymers
Fig. 1. Dynamic Shear Rheometer testing on rubberized bituminous mastics (Author: Francesco Mazzotta).
Fig. 2. Artificial engineered aggregate made of alkali-activated waste materials (Author: Piergiorgio Tataranni).
Fig. 3. Recycled waste bleaching clays (dark brown) in an asphalt concrete aggregates gradation (Author: Piergiorgio Tataranni).

The growing global awareness on the reduction of impacts on the environment is directing the pavement engineering research towards the use of eco-friendly materials also in the construction of transportation infrastructures. Sustainability applied in this field to the design and production of construction materials, finds its basis in the recycling of resources that, otherwise, will be dumped. In parallel, new binders, mixtures and technologies have widened the spectrum of re-cycling applications for those wastes that only few years ago where not used in green pavements.

The Pavement Engineering section of DICAM proposes researches addressed to Practitioners, Authorities and Companies that operate in the field of transportation infrastructures, providing technical solutions aiming to the production of recycled and low impacting materials with high durability and mechanical performances. Studies started several years ago and have lead to the definition of admixtures to be successfully adopted in the construction and maintenance of transportation pavements. These innovative ma-terials have equivalent or better performances when compared to traditional ones and in some cases lower overall costs.

Cold mixed asphalt concretes (Cold mixes) and AC produced at intermediate temperatures (Warm mixes) containing End of Life Tires (ELT) rubber are green solutions that overcome the issues related to the incorporation of crumb or fine rubber into bituminous materials.

The use of Dynamic Shear Rheometer (DSR) for the optimization of mastics and mortars has re-duced the amount of lab-work and enabled the development of high performance mixtures starting from the binding phase rheology.

Alternative fillers have been studied for the re-cycling of waste bleaching clays from the food industry processes. Research on this topic has shown that not all clayey materials have negative effects on the mechanical performances of bituminous bound and cement bound mixtures for pavement layers. Similarly the use of Construction and Demolition recycled aggregates, among which Reclaimed Asphalt Pavement, was proven to be a viable solution to avoid dumping and landfilling.

New frontiers of research are those of using al-ternative binders and cements such as alkali-activated or geopolymerized precursors for the production of artificial engineered aggregates, paving blocks and entire pavement layers..

Main publications

Castro Gomes J., Sangiorgi C., Gabriel M., Lan-tieri C. Tataranni P. (2016). “Reuse of mining waste into innovative alkali-activated-based ma-terials for road pavement applications”. Erkens et al. (Eds) © Taylor & Francis Group, London, Pgg 1736-1744. 4th Chinese European Workshop on Functional Pavement Design. Delft 29 june -1 july 2016. ISBN 978-1-138-02924-8.

Sangiorgi C., Tataranni P., Simone A., Vignali V., Lantieri C., Dondi G. (2016). “Assessment of waste bleaching clay as alternative filler for the production of porous asphalts”. Construction and Building Materials. Volume 109. Pages 1-7. ISSN: 09500618.

Mazzotta F., Sangiorgi C., Vignali V., Lantieri C., Dondi G. (2015). “Rheological characterization of bituminous mastics containing waste bleaching clays”. RILEM Bookseries Volume 11, Pages 595-606. 8th International RILEM SIB Symposium "Testing and Characterization of Sustainable & Innovative Bituminous Materials”, October 7-9, 2015, Ancona, IT. ISSN: 22110844.

Sangiorgi C., Lantieri C., Dondi G. (2015). “Con-struction and demolition waste recycling: An ap-plication for road construction”. International Journal of Pavement Engineering. Vol. 16, Issue 6, 3 July 2015, Pp. 530-537. Taylor and Francis Ltd. ISSN: 10298436.

Sangiorgi C., Tataranni P., Simone A., Vignali V., Lantieri C., Dondi G. (2014). “Waste bleaching clays as fillers in Hot Bituminous Mixtures”. Construction and Building Materials. Elsevier. Vol 73. Pp. 320-325. ISSN 0950-0618.

Dondi G., Tataranni P., Pettinari M., Sangiorgi C., Simone A. and Vignali V. (2014). “Crumb Rubber in Cold Recycled Bituminous Mixes: comparison between Traditional Crumb Rubber and Cryogenic Crumb Rubber”. Construction and Building Materials. Elsevier. Vol 68. Pp. 370-375. ISSN 0950-0618.

Dondi G., Sangiorgi C., Lantieri C., Simone A., Vignali V. & Lamperti R. (2014). “Performance evaluation of Construction and Demolition and other waste materials”. Sustainability, Eco-Efficiency and Conservation in Transportation Infrastructure Asset Management - Proceedings of the 3rd International Conference on Transportation Infrastructures - ICTI 2014, Pisa, April 22-25. Pp. 223-233.

Pettinari M., Sangiorgi C., Dondi G. (2012). Fa-tigue resistance of Warm Mix Asphalt and Rubber Asphalt Concrete with the Dissipated Energy Approach, Proceedings 7th International confer-ence on maintenance and rehabilitation of pave-ments and technological control, MAIREPAV7, Auckland, New Zealand, 28-30 August 2012

Simone A., Lantieri C., Vignali V. (2012). A new “Frugal” approach to road maintenance: 100% recycling of a deteriorated flexible pavement, Proceedings 7th International conference on maintenance and rehabilitation of pavements and technological control, MAIREPAV7, Auckland, New Zealand, 28-30 August 2012.

Research projects

Research Project Agreement between DICAM and Cooperativa Trasporti Imola scrl: Design of cement bound mixtures for pavements layers con-taining RAP. 2016.

Research Project Agreement between DICAM and LUCOS srl. Study for the production of eco-asphalt concrete made with warm mix binders and aggregates from waste and recycled materials. 2015-2016.

Research Project Agreement between DICAM and Ecopneus Scpa. Advanced characterization of bituminous binders with enhanced performance and containing rubbers from PFU. 2014-2016.

Research Project Agreement between DICAM and SAPABA SpA: Study of wearing course bi-tuminous mixtures containing ELT for urban pavements. 2015-2016.

Research Project Agreement between DICAM and Unigrà SpA. Promotion of byproducts for the performance modification of bituminous binders and mixtures for road infrastructures. 2013-2014.

European Project H2020-MSCA-RISE-2014: Re-use of mining waste into innovative geopolymeric-based structural panels, precast, ready mixes and in-situ applications (REMINE). 2015-2018.