Comparative study of the physical properties, time stability and rheology of bituminous mastics modified with mineral filler or/and Kraft lignin
This study aims to comprehensively compare the effects of mineral filler and Kraft lignin on bituminous mixtures, with a focus on understanding lignin's potential in asphalt production. An experimental campaign is established to prepare and test different mixes that include Kraft lignin, minera...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/397517 |
| Acceso en línea: | https://hdl.handle.net/2117/397517 |
| Access Level: | acceso abierto |
| Palabra clave: | Pavements, Asphalt -- Materials -- Testing Pavements, Bituminous -- Design and construction Lignin -- Industrial applications Paviments d'asfalt -- Materials -- Proves Paviments bituminosos -- Disseny i construcció Lignina -- Aplicacions industrials Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials |
| Sumario: | This study aims to comprehensively compare the effects of mineral filler and Kraft lignin on bituminous mixtures, with a focus on understanding lignin's potential in asphalt production. An experimental campaign is established to prepare and test different mixes that include Kraft lignin, mineral filler, or a combination of both, in different dosages. The first goal is to grade mastics using the Performance Grade (PG) classification method. This categorization helps assess their suitability for various applications by determining high and low temperatures and traffic solicitation grades. In-depth analyses delve into various aspects. Microscopic observations reveal similar distribution and size particles of both additives in the binder. Storage stability tests highlight differences between the additives, as mineral filler was unstable at high dosages. Furthermore, density and ash content tests, underline the physical similarities between Kraft lignin and bitumen. Conclusions drawn from rheological properties, underscore lignin's similarity to mineral filler. Elastic recovery tests show reduced recovery with higher aggregate content, revealing that lignin diminishes elasticity similarly to mineral filler. Viscosity analysis indicate that both lignin and filler lead to increased viscosity as aggregate content increases. Small differences emerge in low-temperature behaviour, especially with varying aggregate amounts. Further research is encouraged, such as looking into MSCR test results and creating master curves from DSR results. In summary, this research highlights the comparable effects of lignin and mineral filler in mastics' rheological properties. While similarities exist, subtle variations, especially in low- temperature performance, emerge with differing aggregate quantities. This study contributes to the progress of environmentally conscious road construction practices. However, there are still many ways to continue developing solutions that are sustainable in this sector. The path towards a sustainable future in the road industry relies on the ongoing collaboration between industries and research communities, with the common goal of finding solutions that are socially and ecologically responsible |
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