Experimental Study on Styrene–Butadiene–Styrene-Modified Binders and Fly Ash Micro-Filler Contributions for Implementation in Porous Asphalt Mixes

Manuel Lagos-Varas, Diana Movilla-Quesada (), Aitor C. Raposeiras, Melany Villarroel, Ana B. Ramos-Gavilán and Daniel Castro-Fresno
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Manuel Lagos-Varas: GITECO Research Group, University of Cantabria, 39005 Santander, Spain
Diana Movilla-Quesada: Departamento de Construcción y Agronomía, Escuela Politécnica Superior de Zamora, Universidad de Salamanca, 49029 Zamora, Spain
Aitor C. Raposeiras: Departamento de Ingeniería Mecánica, Escuela Politécnica Superior de Zamora, Universidad de Salamanca, 49029 Zamora, Spain
Melany Villarroel: Gi2V Research Group, Institute of Civil Engineering, University Austral of Chile, Valdivia 5090000, Chile
Ana B. Ramos-Gavilán: Departamento de Ingeniería Mecánica, Escuela Politécnica Superior de Zamora, Universidad de Salamanca, 49029 Zamora, Spain
Daniel Castro-Fresno: GITECO Research Group, University of Cantabria, 39005 Santander, Spain

Sustainability, 2024, vol. 16, issue 3, 1-21

Abstract: Styrene–butadiene–styrene copolymer (SBS) can be used to improve the mechanical and deformation properties of the binder used in its manufacture. However, the high cost of and variability in processing limit its performance. A secondary modifier to solve these problems is nano- and micromaterials that allow for the generation of unique properties in polymeric systems. Based on this, this study experimented with fly ash micro-filler (μFA) in low proportions as a binder modifier with SBS for use in PA mixes. The FA residue is considered in 3% and 5% dosages on a base binder with 5% SBS. Rheological results show that μFA improves classical, linear viscoelastic (LVE), and progressive damage properties compared with the modified binder. The PA blends with μFA reduce binder runout, resulting in a thicker film, thus showing better abrasion resistance in dry and wet conditions. Samples with μFA increase the post-cracking energy in indirect tension due to higher ductility. However, they decrease the fracture energy due to higher cracking before failure. In addition, μFA manages to decrease the difference between dry and wet ITS.

Keywords: porous asphalt mixes; styrene–butadiene–styrene; fly ashes; bitumen; rheology (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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