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Abstract
In recent years, numerous studies have been carried out on new technologies allowing to reduce of mix asphalt production temperatures. One of the possibilities is to foam the asphalt with “water-containing” additives, which include zeolites. So far, mainly synthetic zeolites of the Linde A structure type, obtained from chemical reagents, and natural clinoptilolite have been used in WMA technology. In this studies, the synthetic zeolites produced from fly ashes with 4 different types of crystalline structure were analyzed. Zeolite materials were characterized by textural parameters and thermal analysis. The amount of zeolite added to asphalt was 0, 3, 5, 7 wt % in relation to the weight of asphalt. Determination of dynamic viscosity was performed at two temperatures: 135 and 160 and 4 time intervals. The tests were performed for two asphalt binders: 35/50 and 100/150 penetration grade. As a conclusion, it was found that the viscosity of asphalt pastes with zeolitic materials increases with the increase in the amount of zeolite added. The increase level depends mainly on the textural parameters. The potential usefulness of fly ash derived zeolites in the process of asphalt foaming, which depends mainly on the amount of water contained in the zeolite structure and the method of its release, has been proved.
Highlights
One of the main problems in road construction is high production temperatures and the incorporation of mix asphalt into the road surface
The usefulness of this type of zeolite in warm-mix asphalt (WMA) technology determines the release of zeolite water. It is the only one of the 4 zeolites used in the experiment, characterized by a sharp endothermic peak at 140 ◦ C. Research conducted on this matter indicates the possibility of using zeolite additives in WMA technology
The first works in this regard concerned synthetic zeolite produced from chemical reagents with the structural code LTA
Summary
One of the main problems in road construction is high production temperatures and the incorporation of mix asphalt into the road surface. Production of hot mix asphalt (HMA) is associated with high emissions of harmful compounds, fumes and aerosols into the atmosphere. The alternate solution to HMA is warm-mix asphalt (WMA). The production temperature of these mixes is lower by. Warm-mix asphalt technologies have been known and used in the world for many years. WMA is mainly used in the United States, where it accounts for over 30% of all produced mixes [5]. The industrial application of WMA technology is at a much lower level. Among European countries, only in France and Sweden, WMA’s share in overall bitumen production exceeded 10% [6]
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