Investigação sobre a formulação de um bio-ligante à base da seiva de Euphorbia Tirucalli para emprego em pavimentação

• Ano de defesa: 2017
• Autor(a) principal: Gondim, Lilian Medeiros
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Transportes; Euphorbiaceae; Ligante asfáltico - Modificação; Pavimentos; Euphorbia Tirucalli; Asphaltic modifiers; Prime coats; Rejuvenating agent; Bio-binders
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/31909

The present study aims to contribute to the development of a binder for use in pavement layers, from the modification or partial replacement of the asphalt binder by the sap of Euphorbia Tirucalli (Petroleum Plant). For this purpose, bio-binders were produced from the addition of the sap to an asphalt binder classified by penetration as 50/70 (PG 64-22) in the contents of 3% to 30%. The parameters investigated for the analysis of the binder were: (a) the physical characteristics (softening point and penetration); (b) the chemical characterization (evaluated by Fourier Transformed Infrared Absorption and thermal analysis in TG and DSC); (C) the rheological behavior (Brookfield viscosity, and dynamic shear and bending beam rheometers tests); and (d) the effects of oxidative aging (by simulating aging in RTFOT and in PAV). Then, specific rheological tests were performed to observe the behavior regarding the permanent deformation by means of the Multiple Stress Creep and Recovery Test (MSCR), and fatigue, by Linear Amplitude Sweep Test (LAS). The binder adhesive properties were also measured by the BBS (Binder Bond Strength) Test. From the bio-binder with the highest sap content (30%) two bio-cutbacks were produced, using kerosene and d-limonene as solvents. The bio-cutbacks were investigated for their potential application in priming, using two different methods (capsule and Marshall). Finally, the sap was also added to a previously aged asphalt binder to verify the potential as an asphalt rejuvenating agent. The results of the laboratory investigations showed that: i) it was possible to replace up to 10% of the asphalt binder by the sap without observing significant changes on the rheological properties; ii) the addition of the sap has a solvency effect on the asphalt binder; (iii) the primers with the new diluted bio-asphalts presented penetrations compatible with those obtained with a standard commercial cutback; and iv) when added to the binder aged in RTFOT and PAV, the sap was able to return its properties to the condition observed right after RTFOT, showing potential for employment as an asphaltic rejuvenator.