O revestimento de areia-asfalto a frio, ainda que pouco utilizado, é uma alternativa importante para construção de rodovias de baixo volume de tráfego no Estado do Ceará. Neste trabalho é apresentado estudo comparativo entre misturas de areia-asfalto fabricadas a frio com a utilização de emulsão asfáltica convencional e emulsão modificada com polímero. O objetivo da pesquisa é avaliar, através de ensaios de creep dinâmico, creep estático e o ensaio de desgaste Cantabro, se o uso da emulsão modificada com polímero resulta em uma mistura de areia-asfalto a frio mais resistente ao desgaste e à deformação permanente. As misturas asfálticas analisadas nesta pesquisa apresentaram boa resistência ao desgaste, mas em virtude das dificuldades ocorridas nos ensaios de creep não foram encontradas evidências de que o uso de emulsão modificada com polímero produzisse uma mistura de areia-asfalto a frio mais resistente / Cold sand-asphalt surface layer, although not widely used, is an important alternative for construction of low traffic roads in Ceará State. This work presents a comparative study between cold sand-asphalt mixtures produced with standart asphaltic emulsion and polymer modified emulsion. The aim of this research is to evaluate, with use of dynamic and static creep tests and the Cantabro wear out test, if the use of a polymer modified emulsion would result in a cold sand-asphalt mixture more resistent to wear out and permanent deformation. The asphaltic mixes analyzed in this research presented high wear out resistence, but due to dificulties occurred in creep tests there were not found evidences that the use of polymer modified emulsion would produce a more resistent cold sand-asphalt mixture

O revestimento de areia-asfalto a frio, ainda que pouco utilizado, é uma alternativa importante para construção de rodovias de baixo volume de tráfego no Estado do Ceará. Neste trabalho é apresentado estudo comparativo entre misturas de areia-asfalto fabricadas a frio com a utilização de emulsão asfáltica convencional e emulsão modificada com polímero. O objetivo da pesquisa é avaliar, através de ensaios de creep dinâmico, creep estático e o ensaio de desgaste Cantabro, se o uso da emulsão modificada com polímero resulta em uma mistura de areia-asfalto a frio mais resistente ao desgaste e à deformação permanente. As misturas asfálticas analisadas nesta pesquisa apresentaram boa resistência ao desgaste, mas em virtude das dificuldades ocorridas nos ensaios de creep não foram encontradas evidências de que o uso de emulsão modificada com polímero produzisse uma mistura de areia-asfalto a frio mais resistente / Cold sand-asphalt surface layer, although not widely used, is an important alternative for construction of low traffic roads in Ceará State. This work presents a comparative study between cold sand-asphalt mixtures produced with standart asphaltic emulsion and polymer modified emulsion. The aim of this research is to evaluate, with use of dynamic and static creep tests and the Cantabro wear out test, if the use of a polymer modified emulsion would result in a cold sand-asphalt mixture more resistent to wear out and permanent deformation. The asphaltic mixes analyzed in this research presented high wear out resistence, but due to dificulties occurred in creep tests there were not found evidences that the use of polymer modified emulsion would produce a more resistent cold sand-asphalt mixture

The desire of the minerals industry to be more sustainable has led towards the increasing development of by-products. One such industry is the production of Alumina. The Alumina industry in Australia is the major producer of alumina in the western world with over 25 million tonnes of Bauxite Residue per annum. Alcoa World Alumina (Alcoa) has three refineries in Western Australia producing approximately 20,000 tonnes of Mud and a similar level of Red Sand each day. These as yet unutilised potential resources are being stockpiled, occupying a significant footprint. It is widely recognised within industry that there would be economic, environment and social benefits if a sustainable use for these materials were found. One such potential by-product is the production of coarse bauxite residue (Red Sand), neutralised and washed low in salt. The main purpose of this research was to establish a potential market for this material, through scientific evaluation of Red Sand as a replacement of natural fine aggregate (Natural Yellow Sand) in concrete mixes. For this research, the mixed stream of Bauxite Residue (fine and coarse) obtained in the Bayer process was neutralized by a process of carbonation then washed using cyclones and counter current wash towers to a value added byproduct. The coarse particles (Washed and Carbonated Sand-WCS) of the stream were separated by Wet High Intensity Magnetic Separation technique (WHIMS) so that different segments such as High Iron Sand (HIS) and Low Iron Sand (LIS) were formed. Physical, chemical and mineralogical properties of these materials have been tested and compared with that of natural sand. Several mixes of concrete were then designed using Red Sand as a fine aggregate in order to verify their effects on strength and durability indicators of concrete. / The comparative analysis between normal mix proportions and the mix proportions utilizing Red Sand was also achieved. In addition, the impact of marine environment on concrete mix design and properties of manufactured concrete were evaluated with a series of standard laboratory tests. The findings were promising in terms of both mechanical properties and durability and suggested that Red Sand, in particular Low Iron Sand is likely to be effective in place of fine aggregates and can be used within marine grade concrete with no major differences when compared to normal concrete. From the results obtained, it can be deduced that this material can be used in a wide range of concrete applications in Civil Engineering and Construction.

This research paper covers the analysis of the main asphalt concrete production technological processes. It includes calculation of dosed materials for the asphalt concrete mix, as well as precision and stability of maintenance of temperature necessary for the technological process.

Time- and rate-dependent materials such as polymers, bituminous materials, and soft materials clearly display all four fundamental responses (i.e. viscoelasticity, viscoplasticity, viscodamage, and healing) where contribution of each response strongly depends on the temperature and loading conditions. This study proposes a new general thermodynamic-based framework to specifically derive thermo-viscoelastic, thermo-viscoplastic, thermo-viscodamage, and micro-damage healing constitutive models for bituminous materials and asphalt mixes. The developed thermodynamic-based framework is general and can be applied for constitutive modeling of different materials such as bituminous materials, soft materials, polymers, and biomaterials. This framework is build on the basis of assuming a form for the Helmohelotz free energy function (i.e. knowing how the material stores energy) and a form for the rate of entropy production (i.e. knowing how the material dissipates energy). However, the focus in this work is placed on constitutive modeling of bituminous materials and asphalt mixes. A viscoplastic softening model is proposed to model the distinct viscoplastic softening response of asphalt mixes subjected to cyclic loading conditions. A systematic procedure for identification of the constitutive model parameters based on optimized experimental effort is proposed. It is shown that this procedure is simple and straightforward and yields unique values for the model material parameters. Subsequently, the proposed model is validated against an extensive experimental data including creep, creep-recovery, repeated creep-recovery, dynamic modulus, constant strain rate, cyclic stress controlled, and cyclic strain controlled tests in both tension and compression and over a wide range of temperatures, stress levels, strain rates, loading/unloading periods, loading frequencies, and confinement levels. It is shown that the model is capable of predicting time-, rate-, and temperature-dependent of asphalt mixes subjected to different loading conditions.

Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-07-30T15:09:31Z No. of bitstreams: 1 GUTEMBERG GONÇALVES DA SILVA - DISSERTAÇÃO (PPGECA) 2016.pdf: 3435279 bytes, checksum: dbeee65ecc9e87071e6bd52e090b564d (MD5) / Made available in DSpace on 2018-07-30T15:09:31Z (GMT). No. of bitstreams: 1 GUTEMBERG GONÇALVES DA SILVA - DISSERTAÇÃO (PPGECA) 2016.pdf: 3435279 bytes, checksum: dbeee65ecc9e87071e6bd52e090b564d (MD5) Previous issue date: 2016-08-15 / Pesquisas em pavimentação têm buscado alternativas para reduzir o consumo de combustíveis e a emissão de gases causadores do efeito estufa gerados pelas misturas asfálticas convencionais. A redução das temperaturas de usinagem e compactação de misturas asfálticas é considerada uma alternativa na produção de revestimentos asfálticos capaz de proporcionar vantagens técnicas, econômicas e ambientais. Denominadas misturas mornas, várias tecnologias são utilizadas para a sua produção. Estas são capazes de diminuir as temperaturas de usinagem e compactação das misturas asfálticas sem alterar suas características. Dentro deste contexto esta pesquisa realilizou um estudo comparativo de 4 aditivos: CCBit, Cera de carnaúba, óleo de girassol e óleo de moringa utilizando teores de 1,0%;1,5%;2,0% e 2,5% visando o estudo de suas propriedades reológicas e análise da potencialidade na produção de misturas mornas. Foi observado que todos os aditivos utilizados obtiveram redução na temperatura de compactação e usinagem destacando-se o óleo de moringa que obteve uma redução de 18,3°C. Quando tratamos do melhoramento da qualidade da mistura asfáltica o CCBit ganha destaque pois por sua vez obteve um aumento em seu módulo complexo (G*) aumentando assim a resistência do material. Quando analisados os resultados de forma geral pode-se afirmar que o CCBit e a cera de carnaúba promovem aumento na resistência do ligante enquanto que os óleos indicam perda de resistência com um aumento de sua trabalhabilidade sendo todas opções viáveis de misturas mornas dependendo do local de aplicação. / Pavement researches have been looking for alternatives to reduce fuel consumption and gas emission that cause the greenhouse effect generated by the conventional asphaltic mixes. The reduction of the machining and compaction temperature of asphalt mixes is considered an alternative in production of asphaltic coatings able to provide technical, economic and environmental benefits. Named warm mixes, several technologies are used in their production. They are capable of decreasing the machining and compaction temperatures of the asphaltic mixes without altering its characteristics. In this perspective this research performed a comparative study of 4 additives: CCBit, carnauba wax, sunflower oil and ben tree oil using levels of 1,0%; 1,5%; 2,0%; and 2,5%, intending the study of its rheological properties and analysis of the potentiality in production of warm mixes. It was observed that every additive that was used obtained temperature decrease in compaction and machining especially ben tree oil that obtained a decrease of 18,3ºC. When the purpose is the quality improvement of the asphaltic mix the CCBit stands out because it obtained an increase of its complex module (G*) therefore also increasing the matter resistance. When the results are analyzed in a general way it’s possible to affirm that the CCBit and the carnauba wax stimulate increase of the binder resistance while the oils indicate loss of resistance with increase of its workability, consequently all of them are viable options of warm mixes depending on its appliance site.

É apresentado um estudo sobre a influência da escolha dos parâmetros constitutivos no comportamento de misturas asfálticas, estudando o comportamento do material tanto no regime linear como o regime não-linear de deformações. Foram utilizados os dados experimentais da dissertação de Brito (2006), no qual realizou ensaios de compressão diametral medindo simultaneamente deslocamentos horizontais e verticais, além de que seus ensaios contemplavam corpos-de-prova variando o índice de vazios, crucial para as análises da presente tese. Comparou-se o comportamento das misturas de Brito extraindo-se delas as compliancias de cisalhamento J(t), de compressibilidade B(t) e a curva de fluência D(t) com coeficiente de Poisson assumido como constante. Os resultados das análises no regime linear mostraram que a consideração do coeficiente de Poisson implica alteração do comportamento do material em função do índice de vazios, resultando curvas de fluência diferentes na horizontal e vertical, não condizendo com a lógica de aumento da rigidez com a queda do índice de vazios. Provou-se também que o coeficiente de Poisson é totalmente incorreto para materiais viscoelásticos e assumi-lo como constante negligencia grau de viscoelasticidade do mesmo. Na análise não- linear, as principais conclusões foram que o uso do coeficiente de Poisson pode superestimar a rigidez do material quando este está em fluência não-linear, além de que independentemente do coeficiente de Poisson, o uso da Teoria de Potencial de Trabalho de Schapery não deve ser aplicado se considerada a fase de condicionamento nos dados do ensaio de fadiga, onde foi proposto um modelo para tal consideração que apresentou resultados de previsão satisfatórios frente aos resultados experimentais. Por fim, concluiu-se que o uso do coeficiente de Poisson em misturas asfálticas deve ser abandonado, recomendando-se o uso das compliancias J(t) e B(t), pois são parâmetros constitutivos fundamentais e sem as limitações impostas pelo coeficiente de Poisson. Além disto, recomenda-se cuidado no uso da Teoria do Potencial de Trabalho, não adaptada para a fase de condicionamento do material, recomendando-se uso de modelo auxiliar para, sugerindo-se assim o modelo deduzido nesta tese para uso conjunto com a Teoria do Potencial de Trabalho. / A study on the influence of the choice of constitutive parameters on the behavior of asphalt mixtures, studying the behavior of the material both in the linear and non-linear level of strains. The experimental data from the dissertation of Brito (2006) has been used, which performed indirect tensile tests measuring both horizontal and vertical displacements. The material tested by Brito has taken into account a reasonable range of air voids, which was crucial for the analysis of this thesis. The behavior of the mixes has been compared extracting from them the shear compliances J(t), compressibility B (t) and creep compliance D (t) with Poisson's ratio assumed as constant. The analysis results in the linear level of strains has shown that the consideration of Poisson's ratio implies change in material behavior in function of the air voids, resulting different creep compliances in the horizontal and vertical, not matching the logic increasing of stiffness with the decreasing of the air voids. It was also proved that the Poisson ratio is totally incorrect for viscoelastic materials and assume it as constant neglect of degree of viscoelasticity. In nonlinear analysis, the main conclusions were that the use of Poisson's ratio may overestimate the stiffness of the material when it is in nonlinear creep, despite the use of Poisson's ratio, the Schapery’s Work Potential Theory should not be applied if considered in the conditioning phase of the fatigue test data, where a model was proposed for such consideration and the results were satisfactory prediction compared to experimental results. Finally, it was concluded that the use of Poisson's ratio in asphalt mixtures must be abandoned, recommending the use of compliances J (t) and B (t), which are fundamental constitutive parameters without the constraints imposed by the Poisson’s ratio. Moreover, caution is advised in the use of the Schapery’s Work Potential Theory, not adapted to the conditioning phase of the material, recommending the use of auxiliary model, thus suggesting the model deduced in this thesis for use in conjunction with the Schapery’s Work Potential Theory.

É apresentado um estudo sobre a influência da escolha dos parâmetros constitutivos no comportamento de misturas asfálticas, estudando o comportamento do material tanto no regime linear como o regime não-linear de deformações. Foram utilizados os dados experimentais da dissertação de Brito (2006), no qual realizou ensaios de compressão diametral medindo simultaneamente deslocamentos horizontais e verticais, além de que seus ensaios contemplavam corpos-de-prova variando o índice de vazios, crucial para as análises da presente tese. Comparou-se o comportamento das misturas de Brito extraindo-se delas as compliancias de cisalhamento J(t), de compressibilidade B(t) e a curva de fluência D(t) com coeficiente de Poisson assumido como constante. Os resultados das análises no regime linear mostraram que a consideração do coeficiente de Poisson implica alteração do comportamento do material em função do índice de vazios, resultando curvas de fluência diferentes na horizontal e vertical, não condizendo com a lógica de aumento da rigidez com a queda do índice de vazios. Provou-se também que o coeficiente de Poisson é totalmente incorreto para materiais viscoelásticos e assumi-lo como constante negligencia grau de viscoelasticidade do mesmo. Na análise não- linear, as principais conclusões foram que o uso do coeficiente de Poisson pode superestimar a rigidez do material quando este está em fluência não-linear, além de que independentemente do coeficiente de Poisson, o uso da Teoria de Potencial de Trabalho de Schapery não deve ser aplicado se considerada a fase de condicionamento nos dados do ensaio de fadiga, onde foi proposto um modelo para tal consideração que apresentou resultados de previsão satisfatórios frente aos resultados experimentais. Por fim, concluiu-se que o uso do coeficiente de Poisson em misturas asfálticas deve ser abandonado, recomendando-se o uso das compliancias J(t) e B(t), pois são parâmetros constitutivos fundamentais e sem as limitações impostas pelo coeficiente de Poisson. Além disto, recomenda-se cuidado no uso da Teoria do Potencial de Trabalho, não adaptada para a fase de condicionamento do material, recomendando-se uso de modelo auxiliar para, sugerindo-se assim o modelo deduzido nesta tese para uso conjunto com a Teoria do Potencial de Trabalho. / A study on the influence of the choice of constitutive parameters on the behavior of asphalt mixtures, studying the behavior of the material both in the linear and non-linear level of strains. The experimental data from the dissertation of Brito (2006) has been used, which performed indirect tensile tests measuring both horizontal and vertical displacements. The material tested by Brito has taken into account a reasonable range of air voids, which was crucial for the analysis of this thesis. The behavior of the mixes has been compared extracting from them the shear compliances J(t), compressibility B (t) and creep compliance D (t) with Poisson's ratio assumed as constant. The analysis results in the linear level of strains has shown that the consideration of Poisson's ratio implies change in material behavior in function of the air voids, resulting different creep compliances in the horizontal and vertical, not matching the logic increasing of stiffness with the decreasing of the air voids. It was also proved that the Poisson ratio is totally incorrect for viscoelastic materials and assume it as constant neglect of degree of viscoelasticity. In nonlinear analysis, the main conclusions were that the use of Poisson's ratio may overestimate the stiffness of the material when it is in nonlinear creep, despite the use of Poisson's ratio, the Schapery’s Work Potential Theory should not be applied if considered in the conditioning phase of the fatigue test data, where a model was proposed for such consideration and the results were satisfactory prediction compared to experimental results. Finally, it was concluded that the use of Poisson's ratio in asphalt mixtures must be abandoned, recommending the use of compliances J (t) and B (t), which are fundamental constitutive parameters without the constraints imposed by the Poisson’s ratio. Moreover, caution is advised in the use of the Schapery’s Work Potential Theory, not adapted to the conditioning phase of the material, recommending the use of auxiliary model, thus suggesting the model deduced in this thesis for use in conjunction with the Schapery’s Work Potential Theory.

É apresentado um estudo sobre a influência da escolha dos parâmetros constitutivos no comportamento de misturas asfálticas, estudando o comportamento do material tanto no regime linear como o regime não-linear de deformações. Foram utilizados os dados experimentais da dissertação de Brito (2006), no qual realizou ensaios de compressão diametral medindo simultaneamente deslocamentos horizontais e verticais, além de que seus ensaios contemplavam corpos-de-prova variando o índice de vazios, crucial para as análises da presente tese. Comparou-se o comportamento das misturas de Brito extraindo-se delas as compliancias de cisalhamento J(t), de compressibilidade B(t) e a curva de fluência D(t) com coeficiente de Poisson assumido como constante. Os resultados das análises no regime linear mostraram que a consideração do coeficiente de Poisson implica alteração do comportamento do material em função do índice de vazios, resultando curvas de fluência diferentes na horizontal e vertical, não condizendo com a lógica de aumento da rigidez com a queda do índice de vazios. Provou-se também que o coeficiente de Poisson é totalmente incorreto para materiais viscoelásticos e assumi-lo como constante negligencia grau de viscoelasticidade do mesmo. Na análise não- linear, as principais conclusões foram que o uso do coeficiente de Poisson pode superestimar a rigidez do material quando este está em fluência não-linear, além de que independentemente do coeficiente de Poisson, o uso da Teoria de Potencial de Trabalho de Schapery não deve ser aplicado se considerada a fase de condicionamento nos dados do ensaio de fadiga, onde foi proposto um modelo para tal consideração que apresentou resultados de previsão satisfatórios frente aos resultados experimentais. Por fim, concluiu-se que o uso do coeficiente de Poisson em misturas asfálticas deve ser abandonado, recomendando-se o uso das compliancias J(t) e B(t), pois são parâmetros constitutivos fundamentais e sem as limitações impostas pelo coeficiente de Poisson. Além disto, recomenda-se cuidado no uso da Teoria do Potencial de Trabalho, não adaptada para a fase de condicionamento do material, recomendando-se uso de modelo auxiliar para, sugerindo-se assim o modelo deduzido nesta tese para uso conjunto com a Teoria do Potencial de Trabalho. / A study on the influence of the choice of constitutive parameters on the behavior of asphalt mixtures, studying the behavior of the material both in the linear and non-linear level of strains. The experimental data from the dissertation of Brito (2006) has been used, which performed indirect tensile tests measuring both horizontal and vertical displacements. The material tested by Brito has taken into account a reasonable range of air voids, which was crucial for the analysis of this thesis. The behavior of the mixes has been compared extracting from them the shear compliances J(t), compressibility B (t) and creep compliance D (t) with Poisson's ratio assumed as constant. The analysis results in the linear level of strains has shown that the consideration of Poisson's ratio implies change in material behavior in function of the air voids, resulting different creep compliances in the horizontal and vertical, not matching the logic increasing of stiffness with the decreasing of the air voids. It was also proved that the Poisson ratio is totally incorrect for viscoelastic materials and assume it as constant neglect of degree of viscoelasticity. In nonlinear analysis, the main conclusions were that the use of Poisson's ratio may overestimate the stiffness of the material when it is in nonlinear creep, despite the use of Poisson's ratio, the Schapery’s Work Potential Theory should not be applied if considered in the conditioning phase of the fatigue test data, where a model was proposed for such consideration and the results were satisfactory prediction compared to experimental results. Finally, it was concluded that the use of Poisson's ratio in asphalt mixtures must be abandoned, recommending the use of compliances J (t) and B (t), which are fundamental constitutive parameters without the constraints imposed by the Poisson’s ratio. Moreover, caution is advised in the use of the Schapery’s Work Potential Theory, not adapted to the conditioning phase of the material, recommending the use of auxiliary model, thus suggesting the model deduced in this thesis for use in conjunction with the Schapery’s Work Potential Theory.

Depuis les années 2000, les grandes entreprises routières axent leurs recherches sur l’abaissement des températures de fabrication et de mise en œuvre des enrobés bitumineux à chaud (de 30 à 50°C). Le développement de ces nouveaux enrobés, dits tièdes, a fait apparaître sur les chantiers des problématiques de maniabilité qui n’existaient pas dans le cas des enrobés à chaud, notamment lors des mises en œuvre manuelles. Ce sujet de thèse, inscrit dans cette thématique des enrobés bitumineux tièdes, vise à étudier leur comportement aux températures de mise en œuvre et à développer une démarche de caractérisation et d’évaluation de leur maniabilité. Pour cela, le travail expérimental a été réalisé à différentes échelles du matériau (liant, mastic et enrobé), sur des matériaux réels (aux liants bitumineux) et modèles (aux huiles de silicone), en s’articulant autour de deux axes principaux : les propriétés de viscosité des liants et des mastics d’une part, puis les propriétés de maniabilité des enrobés évaluées par un outil depuis peu normalisé, à savoir le maniabilimètre. Après un état de l’art sur les enrobés bitumineux, notamment tièdes, leur mise en œuvre et méthodes de caractérisation, et les propriétés rhéologiques des liants et des mastics bitumineux, une présentation des différents matériaux utilisés est faite. Les études rhéologiques menées sur liant et sur mastic sont présentées dans une première partie, depuis la mise en place des protocoles de mesure en plan-plan jusqu’à l’analyse des différents comportements, en fonction de paramètres choisis tels que la température, le taux de cisaillement, le taux de fines ou la présence d’additif tiède. Outre la vérification du caractère newtonien des bitumes et la validation des matériaux modèles, cette partie met en évidence le comportement non newtonien des mastics aux taux de fines testés, ainsi que la présence d’un phénomène de sédimentation dans les mastics, particulièrement à haute température, qui amène à s’interroger sur la pertinence de l’étude à l’échelle mastic par rapport à celle sur liant. En deuxième partie, l’analyse de la maniabilité à l’échelle de l’enrobé est menée à l’aide du maniabilimètre (NF P 98 258-1) ; l’intérêt de maîtriser la compacité de l’échantillon pour une bonne pertinence de l’essai est démontré. Une analyse de différents paramètres, tant géométriques que produits, initialement sur enrobés modèles puis réels, a permis de mettre en évidence la capacité et les limites de cet outil à caractériser la maniabilité, en corrélation avec les études rhéologiques sur liant et mastics / Since the 2000s, road industries have focused their researches on lowering the mixing and implementation temperatures of Hot Mix Asphalt (HMA) (from 30 to 50°C). These new asphalt concretes, called Warm Mix Asphalt (WMA), created a workability issue that did not exist in the case of HMA, especially during manual implementation. This thesis aims to study the behavior of these WMA at implementation temperatures and to develop a method to characterize and evaluate their workability. For that, the experimental work was done at several scales of the material (the binder, the mastic and the mixture), some made with bituminous binders and some with silicone oils. Two properties were studied: on the one hand the viscosity of binders and mastics, and on the other hand the workability of mixtures measured by the workability device, newly standardized. After a state of the art on asphalt concretes, in particular WMA, on their implementation and characterization techniques, on the rheological properties of bituminous binders and mastics, the different materials used are presented along with their characterizations. The rheological studies conducted on binder and mastic are exposed in a first part, from the setup of measure procedures to the analysis of different behaviors with respect to the chosen parameters such as temperature, shear rate, filler content. This part highlights not only the Newtonian nature of binders but also the non-Newtonian behavior of mastics and the sedimentation phenomenon they endured at high temperatures which leads to investigate the legitimacy of the study at the mastic scale. In a second part, the workability of the mixtures is measured with the workability device (NF P 98 258-1), showing the importance of controlling the void content of the sample to guaranty a relevant test. An analysis of several parameters highlighted the ability and the limits of this device to characterize workability, with regard to the rheological studies on binders and mastics