Effect of composition and processing on the linear viscoelasticity of synthetic binders |
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Authors: | Francisco Javier Navarro Francisco Martínez-Boza Críspulo Gallegos |
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Institution: | Departamento de Ingeniería Química, Universidad de Huelva, Facultad de Ciencias Experimentales, Campus de El Carmen, 21071, Huelva, Spain |
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Abstract: | The influence that composition and processing variables exert on the linear viscoelastic properties of model synthetic binders has been studied in a wide range of temperature and frequency. Model synthetic binders were prepared by blending a non-modified colophony resin (40-65%), a process aromatic oil and a styrene-butadiene-styrene (SBS) triblock copolymer (5-15%). At high SBS content (11% and 15%) and gentle processing conditions (i.e. 150 °C and 60 rpm), a plateau region in G′ is found in the mechanical spectrum. The microstructure of this binder is characterized by a continuous SBS-rich phase. On the contrary, a shoulder in G′ is found at low polymer content. The resulting microstructure consists of a continuous resin-rich phase and a dispersed polymer-rich phase. Under severe processing conditions (180 °C and 1200 rpm) and low polymer concentration, the polymer influence is dampened and the glassy region appears at higher temperatures or lower frequencies. At high polymer concentration, a phase inversion can be induced by processing (i.e. 180 °C and 1200 rpm.). Both resin oxidation and SBS degradation may explain such microstructural changes. |
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Keywords: | Binder Bitumen SBS Viscoelasticity Processing |
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