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Dear Colleagues,

The need to maximise the durability and safety of road pavements is widely recognized. This can be achieved via improving asphalt properties and developing new types of asphalt for pavement construction. Special attention is paid to the environmental sustainability of asphalt pavement. Asphalt can be modified via the incorporation of a range of materials, such as polymers, rubber wax, F-T synthetic wax, and natural asphalt, or the addition of various chemical additives, especially low-viscosity ones. The effectiveness of these measures is assessed with increasingly advanced rheological tests of the binder, which are capable of predicting its behaviour over pavement service life. It is critical that we continue to develop and constantly improve new types of bituminous mixtures produced with binders modified with low-viscosity additives or zeolite-foamed asphalt at lower mixing and paving temperatures (e.g., half-warm mix asphalt). From a sustainability perspective, the half-warm mix asphalt technologies that rely on water-foamed asphalt and enable mixture production at a temperature of approximately 100 °C are particularly relevant. In addition to a long service life, modern asphalt pavements are required to have an adequate roughness level to ensure traffic safety. Asphalt materials such as porous asphalt or special types of SMA mixtures meet this criterion. Progressive enhancement of asphalt’s material properties is accompanied by advances in diagnostic methods that verify the effectiveness of the material solutions applied.

Prof. Dr. Marek Iwański
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Open AccessArticle

Investigation of the Rheological Properties and Storage Stability of Waste Polyethylene/Ethylene–Vinyl Acetate-Modified Asphalt with Crosslinking and a Silicone Coupling Agent

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Materials 2023, 16(9), 3289; https://doi.org/10.3390/ma16093289 - 22 Apr 2023

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Abstract

As the market for polyethylene consumption continues to expand, the amount of waste polyethylene is also increasing. Modifying asphalt with waste polyethylene (PE) is economical and environmentally friendly. The low-temperature performance and storage stability of PE-modified asphalt has long been an insurmountable problem. The high vinyl acetate (VA) content of ethylene–vinyl acetate (EVA) and PE blended into asphalt can improve the compatibility of PE and asphalt. It compensates for the high VA content of EVA brought about by the lack of high-temperature resistance to permanent deformation but is still not conducive to the stable storage of PE at high temperatures. The effect of furfural extraction oil, a crosslinking (DCP) agent, a silicone coupling agent (KH-570), and calcium carbonate (CaCO₃) on the rheological properties and compatibility of PE/EVA-modified asphalt was investigated in this study. The conventional physical properties of PE/EVA-modified asphalt were tested after introducing furfural extraction oil, DCP, KH570, and CaCO₃ to determine the correlations of these materials. In addition, frequency sweep, multiple stress creep and recovery (MSCR), and linear amplitude sweep (LAS) were utilized to characterize the rheological properties and fatigue behavior. The results reveal that the addition of suitable ratios of furfural extract oil, DCP, KH-570, and CaCO₃ to PE/EVA-modified asphalt produces a remarkable improvement in the viscoelastic characteristics and viscosity compared with PE/EVA-modified asphalt. Furthermore, fluorescence microscopy (FM) was utilized to evaluate the modification mechanism, which shows that PE/EVA undergoes significant crosslinking in asphalt, forming a three-dimensional network structure that dissolves in the asphalt. The storage stability of the PE-modified bitumen was fully determined, and its high-temperature rheology was substantially improved. Full article

(This article belongs to the Special Issue Advances in Asphalt Materials (Second Volume))

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