Abstract

ALVAREZ-LUGO, Allex Eduardo  and  CARVAJAL-MUNOZ, Juan Sebastián. Practical lessons learnt from the application of X-ray computed tomography to evaluate the internal structure of asphalt mixtures. Dyna rev.fac.nac.minas [online]. 2014, vol.81, n.188, pp.52-59. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v81n188.40042.

X-ray Computed Tomography (X-ray CT) has allowed for the efficient non-destructive characterization of the internal structure of paving asphalt mixtures (AM), and has led to multiple practical lessons learnt based on the analysis of laboratory- and field-produced AM. This paper aims at summarizing these practical lessons, to facilitate their future application and further developments, in terms of: (i) fabrication of laboratory specimens, (ii) comparison of laboratory- and field-compacted mixtures, (iii) comparison of hot-mix asphalt and warm-mix asphalt mixtures, (iv) effects of additives, temperature, and compaction, (v) stone-on-stone contact, (vi) relationship between internal structure and performance, and (vii) modeling applications. These practical lessons are primarily gathered from the analysis of the air void distribution of laboratory-and field-produced AM, evaluated through X-ray CT, which has led to relevant inputs for the assessment of the response and performance of AM. X-ray CT enables computation of the AM internal structure with multiple practical applications and future opportunities to enhance the microstructure of AM and, consequently, optimize their performance.

Keywords : X-ray computed tomography; internal structure; air voids; asphalt mixture; pavements engineering.

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