Environmental and mechanical benefits of cold recycled bituminous mixes with crumb rubber

A. Castro, G. Martínez, L. Fuentes, A. Bonicelli, J. Preciado, J. Santos

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


Cold mix recycling technologies based on asphalt emulsion have been acknowledged for allowing to reduce the environmental burdens associated with road pavement maintenance and rehabilitation. In fact, mixing and placement are conducted at lower temperatures leading to energy savings, a reduction of asphalt aging, fume and odor releasing, and a general decrease of airborne emissions. However, there are still several concerns related to the high variability of reclaimed asphalt pavement (RAP), the lack of standard mix-design procedures and the fair/low mechanical performance often achieved especially due to poor moisture resistance. On other side, the addition of crumb rubber into hot mix asphalts is considered an environmentally-friendly and cost-effective practice in several countries. Producing bituminous cold mixes containing crumb rubber to develop a “greener” paving material with a performance level comparable to that of conventional materials, represents a great challenge to materials engineering. This paper presents the results of a laboratory investigation concerning the mix-design characteristics of cold 100%-recycled asphalt emulsion mixes, using crumb rubber to improve cold recycling engineered properties. Mechanical and volumetric properties were assessed through fatigue tests, dynamic modulus and indirect tensile strength on dry and water-conditioned specimens. Finally, a life cycle assessment of alternative maintenance and rehabilitation treatments was conducted to quantify both engineered and environmental advantages in relation to the conventional materials.
Original languageEnglish
Title of host publicationPavement and Asset Managemen
Subtitle of host publicationProceedings of the World Conference on Pavement and Asset Management (WCPAM 2017), June 12-16, 2017, Baveno, Italy
EditorsMaurizio Crispino
Place of PublicationLondon
PublisherRoutledge Taylor & Francis Group
Number of pages8
ISBN (Electronic)9780429264702
Publication statusPublished - 2019
EventWorld Conference on Pavement and Asset Management, WCPAM 2017 - Baveno, Italy
Duration: 12 Jun 201716 Jun 2017


ConferenceWorld Conference on Pavement and Asset Management, WCPAM 2017
Abbreviated titleWCPAM

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