Stiffness assessment of cold recycled asphalt mixtures-Aspects related to filler type, stress state, viscoelasticity, and suction

Autor(es)

Costa Meneses, Joao Paulo ^[1] ; Vasconcelos, Kamilla ^[1] ; Bariani Bernucci, Liedi Legi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Transportat Engn, BR-05508070 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CONSTRUCTION AND BUILDING MATERIALS; v. 318, FEB 7 2022.
• Citações Web of Science: 0

Resumo

Cold recycling is an advantageous technique, from economic and environmental perspectives, for asphalt pavement rehabilitation, interventions, and maintenance. Additional investigation is still needed for the widespread of the technique. Some of the issues evolve predicting the recycled material mechanical behavior and performance along its service life. Therefore, stiffness assessment (through triaxial resilient modulus and dynamic modulus tests) and suction tests were performed to better understand the cold recycled asphalt mixture (CRAM) behavior. This paper covered an investigation of the suction pressure phenomenon and its effects regarding the stiffness of emulsion-stabilized cold recycled asphalt mixtures, considering different fillers. A noncontact suction test method was proposed for CRAM compacted specimens in a way to enable total suction readings. Further theoretical analysis, key literature review, and discussions were presented. Some of the findings of the work are: (i) CRAM's stiffness may present similar behavior of a granular material, with confining pressure dependence, and at the same time, presents a temperature/frequency dependence (as asphaltic materials); (ii) suction phenomenon may be responsible for part of the stiffness of CRAM; (iii) the filler type (even in small percentage) affects the mechanical behavior of CRAM. (AU)

• Processo FAPESP: 17/25708-7 - Reologia e química de ligantes asfálticos e bioligantes: ferramentas para a compreensão do comportamento mecânico, envelhecimento e deterioração dos revestimentos de pavimentos
• Beneficiário: Kamilla Vasconcelos Savasini
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores