In this article, we want to provide you with information about Asphalt Filler Mechanism Seal and the Paving Engineering that will help you a lot.
Residential asphalt paving
Asphalt mastic is essential in asphalt mixtures used in pavement engineering.
Understanding the behavior of the interaction between the two materials is critical for improving the pavement performance of asphalt mastics.
In this article, we are going to discuss the seal mechanism and the must-know things about asphalt.
The objectives of this study were to assess the capability of asphalt-filler interaction using macro-rheological measurements and to investigate the asphalt-filler interaction mechanism related to the microstructural properties of asphalt mastics.
The asphalt-filler interaction was characterized using initial macro-rheological characteristics of asphalt mastics based on dynamic shear rheometer (DSR) tests.
Second, a Fourier transforms infrared (FTIR) spectrometer was used to assess the physicochemical interaction between the asphalt and filler in a qualitative manner.
Third, experiments were carried out using scanning electron microscopy (SEM) and atomic force microscopy (AFM) to investigate the asphalt-filler interaction in terms of the micro-morphological properties of mineral fillers and asphalt mastics.
Finally, grey relational analysis (GRA) was used to determine the relationship between the macro-micro performances of asphalt mastics and mineral filler properties.
The results show that a higher alkaline mineral filler content within the critical volume fraction range increased the ability of the filler and asphalt to interact.
Given that there were no obvious new adsorption peaks in the FTIR spectrum, the asphalt-filler interaction is primarily a physical process.
The main determinants of the micro-morphological properties of asphalt mastic were the adsorption effect of mineral fillers on polar fractions and the dispersion effect of mineral fillers on wax crystals in the asphalt binder.
The acidity and content of mineral fillers had a significant impact on the micro-morphological and macro-rheological properties of asphalt mastics, according to the GRA findings, while the specific surface area of the mineral filler had a significant impact on the ability of the asphalt and filler to interact.
Furthermore, the K-B-index was a better choice for assessing the potential for asphalt-filler interaction.
Asphalt pavement's serviceability is significantly reduced over its long service life due to severe distress caused by repeated traffic loads, freeze-thaw cycles, and other external factors.
According to the theory governing asphalt mortar, an asphalt mixture is a multi-level spatial network structure dispersion system that can include a coarse dispersion system (asphalt mixture), a subdivided dispersion system (asphalt mortar), and a differential dispersion system (asphalt mastic).
As the dispersed phase in an asphalt mixture, coarse aggregate is distributed throughout the asphalt mortar. Fine aggregate is dispersed as the dispersed phase in asphalt mortar, which is composed of asphalt binder and mineral filler.
Asphalt mastic is essential for aggregate bonding and void filling in asphalt mixtures.
Numerous studies have shown that the interaction between the mineral filler and the asphalt binder (referred to as the "asphalt-filler interaction") has an effect on the viscoelastic and mechanical properties of asphalt mastics, which has a significant impact on the overall pavement performance of asphalt mixtures, including fatigue damage resistance, low-temperature cracking resistance, high-temperature stability, and moisture stability.
Cohesive failures in asphalt mastics, for example, frequently cause fatigue damage, which begins as microcracks and gradually spreads to form macrocracks.
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To better understand the functionality of asphalt mastics and effectively reduce pavement distress, it is necessary to evaluate the asphalt-filler interaction ability, investigate related influential factors of asphalt-filler interactions, and reveal the interaction mechanism associated with asphalt mastics' microstructural characteristics.
Numerous research studies suggested that mechanical reinforcement and physicochemical interaction would be important in improving the performance of an asphalt binder containing a mineral filler.
Volume filling and particle structuralization are two mechanical reinforcement methods.
Because filler particles with a lower mineral filler content replace some of the asphalt binders, the stiffness of asphalt mastic as a diluted suspension improves moderately.
When the filler volume fraction reaches approximately 40%, the filler particles begin to aggregate and form an interconnected network, causing the stiffness of asphalt mastics to rapidly increase in the direction of particle structuralization.
The physicochemical interaction is thought to be caused by the formation of a structural asphalt layer, which results in the formation of the asphalt layer and ultimately improves the engineering performance of asphalt mastics.
Numerous studies have shown that temperature, loading frequency, filler acidity, filler content, filler particle size, and other factors influence the interaction of the asphalt and the filler.
Fan et al.
discovered that temperature improved the interfacial adhesion capacity of asphalt mastics.
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Rheological assessments are also frequently used to assess the capability of asphalt filler interaction.
Tan et al. used the complex modulus coefficient to evaluate the asphalt-aggregate interaction ability, but they discovered that G was unable to differentiate between the impacts of different types of aggregate powder on the interaction ability.
Guo concluded that the intrinsic viscosity was insufficiently sensitive to distinguish between the interactions abilities of various filler volume fractions based on his evaluation of the intrinsic viscosity.
According to Tan et al., the complex viscosity coefficient can be used to assess the interfacial interaction between asphalt and filler.
While Zhang et al. discovered that the Einstein coefficient KE was inapplicable to analyzing the effect of filler concentrations, Nelson et al. used the Einstein coefficient KE to investigate the enhancement effect of glass spheres on the modulus of particulate-filled composites.
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Using atomic force microscopy (AFM), Lv et al. discovered that the surface micro-morphological characteristics of mineral particles influence how well asphalt binders adhere to mineral particles.
Other microscopic techniques, such as SEM, AFM, and FTIR, are undoubtedly useful for investigating how mineral fillers affect the microstructural properties of asphalt mastics.
In conclusion, previous research has increased our understanding of the viscoelastic properties and mechanical behaviors of asphalt mastics.
However, little consideration has been given to the extent and manner in which the microstructural characteristics will impact the interactions between the asphalt and filler.
To improve the engineering performance of asphalt mastics in the design process of asphalt mixtures, it is critical to gain a deeper understanding of the interaction between the asphalt and filler from a multi-scale perspective using a rheological-morphological coupling method.
