Browsing by Author "Falchetto, Augusto Cannone"

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    Investigation of Low Temperature Cracking in Asphalt Pavements National Pooled Fund Study – Phase II
    (Minnesota Department of Transportation, 2012-08) Marasteanu, Mihai; Buttlar, William; Bahia, Hussain; Williams, Christopher; Moon, Ki Hoon; Teshale, Eyoab Zegey; Falchetto, Augusto Cannone; Turos, Mugurel; Dave, Eshan; Paulino, Glaucio; Ahmed, Sarfraz; Leon, Sofie; Braham, Andrew; Behnia, Behzad; Tabatabaee, Hassan; Velasquez, Raul; Arshadi, Amir; Puchalski, Sebastian; Mangiafico, Salvatore; Buss, Ashley; Bausano, Jason; Kvasnak, Andrea
    The work detailed in this report represents a continuation of the research performed in phase one of this national pooled fund study. A number of significant contributions were made in phase two of this comprehensive research effort. Two fracture testing methods are proposed and specifications are developed for selecting mixtures based on fracture energy criteria. A draft SCB specification, that received approval by the ETG and has been taken to AASHTO committee of materials, is included in the report. In addition, alternative methods are proposed to obtain mixture creep compliance needed to calculate thermal stresses. Dilatometric measurements performed on asphalt mixtures are used to more accurately predict thermal stresses, and physical hardening effects are evaluated and an improved model is proposed to take these effects into account. In addition, two methods for obtaining asphalt binder fracture properties are summarized and discussed. A new thermal cracking model, called "ILLI-TC," is developed and validated. This model represents a significant step forward in accurately quantifying the cracking mechanism in pavements, compared to the existing TCMODEL. A comprehensive evaluation of the cyclic behavior of asphalt mixtures is presented, that may hold the key to developing cracking resistant mixtures under multiple cycles of temperature.
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    Micromechanics and analogical models for forward and inverse problems in asphalt materials low temperature characterization.
    (2010-08) Falchetto, Augusto Cannone
    The use of increased proportions of Reclaimed Asphalt Pavement (RAP) in the construction of asphalt pavements has become a top priority due to its economical and environmental benefits. However, the blending process that occurs during mixing between the new virgin binder and the RAP aged binder is not well understood, and the question if total blending occurs or other mechanisms takes place that influence the effective properties of the mixture remains unanswered. For many years, various models have been developed and used to predict the composite asphalt mixture properties from the properties of the components.This type of approach is generally known as forward problem. More recently, researchers started to investigate the possibility of predicting binder properties Rom mixture properties (inverse problem). In this dissertation the inverse problem of obtaining asphalt binder properties Rom asphalt mixture properties at low temperature is investigated. First an extensive literature review of the models available is performed. Then the forward problem of predicting the asphalt mixture properties from asphalt binder properties is investigated using one semi- data obtained with the Bending Beam Rheometer (BBR). Next, the same two models are applied to predict the binder properties from the mixture properties. Then, based on Huet model, expressions that relates the asphalt mixture stiffness to the asphalt binder stiffness and vice versa are obtained.