Solventless fingerprinting of bituminous materials: A high-resolution thermogravimetric method

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Thermochimica Acta, 436, 1-2, pp. 35-42, 2005-10-01 Solventless fingerprinting of bituminous materials: a high-resolution thermogravimetric method Masson, J-F.; Bundalo-Perc, S. AbstractThe thermogravimetric analysis (TGA) of bituminous materials by means of a constant heat rate is often plagued by low resolution and poor reproducibility of the degradation or mass loss temperatures. The TGA curve, or the associated differential TGA (DTGA) signal, is thus an unreliable quality control or quality assurance (QC/QA) method. A 2-and 3-step high-resolution TGA/DTGA method was developed for these materials for analysis between 150°C and 800°C. The DTGA results, obtained within 2h, show about ten discrete mass peaks, the profile being material dependant. The reproducibility of the results indicate that the methods may be used for rapid QC/QA and material fingerprinting. The development of the method is detailed and its application is illustrated with the analysis of several bitumens and polymer-modified bituminous sealants.

Early Thermodegradation of Bituminous Sealants Resulting from Improper Installation

“…It is a method of controlled combustion in which mass loss is measured as a function of temperature. For sealants, four regions of mass loss are obtained: light, medium and heavy oils at 50-350°C, 350-500°C, and 500-600°C, and mineral filler at 600-750°C (14). The standard deviation on mass loss is typically 2.5% by weight or better.…”

“…After the sealant bars were collected in the troughs, they were wrapped in aluminum foil and stored in a freezer at -20°C until they were analyzed by FTIR, TGA, GPC and DSR. The sample preparation for these analyses and the experimental conditions for data acquisitions is provided elsewhere (9,12,14).…”

Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength

“…Using the modules of high-resolution in thermogravimetric analysis software (HRTG) the problem could be solved. These modules increase the resolution to reasonable testing times [1,[4][5][6][7][8] and can be applied successfully in the analysis of construction materials if the correct parameters are selected as was suggested by Tobón et al [8] With the use of HRTG, a new difficulty is found, due to the fact that the hydrated mineralogical phases of cement are not stoichiometric materials, it is common that the same phase show two or three peaks corresponding to different decomposition phenomena [8]. Because of this, a detailed study about the identification of cement-hydrated phases is necessary.…”

Efeito da adição de material vegetal (fibra da castanha de cutia) e polímero (SBS) nas propriedades do ligante asfáltico (CAP 50/70)

“…O copolímero de estireno e butadieno (SBS), fornecido pelo Centro de Pesquisas da Petrobras (CENPES), apresenta as características constantes na Tabela 1. Estudos referenciam que o uso desse polímero, com características de elastômeros termoplásticos, atua de forma satisfatória nas propriedades físicas e mecânicas dos materiais asfálticos [4][5][6][15][16][17] , tais como: o acréscimo no retorno elástico e a melhoria da resistência à deformação permanente por alongamento e recuperação.…”