Abstract
Aggregate is an indispensable raw material for emulsified asphalt construction. For the purpose of explaining the influence of aggregate characteristics on the demulsification speed of emulsified asphalt, the surface energy and specific surface area (SSA) characteristics of aggregates were calculated based on the capillary rise method and the BET (Brunauer-Emmett-Teller) adsorption test. Afterwards, the effect of the surface energy and specific surface area of the aggregate on the emulsified asphalt demulsification speed was systematically studied by using ultraviolet spectroscopy as well as the orthogonal test. Experimental results indicate that the specific surface energy parameter of the aggregate is certainly related to the particle size of the aggregate. That is, the surface free energy of the unit system is proportional to the surface area A and the density of the interface unit. The specific surface area parameter of aggregates increases with the decrease of particle size, when the particle size is reduced to 600 mesh, the specific surface area parameters of the three aggregates selected in this paper tend to be consistent. Orthogonal experimental analysis demonstrates that the surface energy and specific surface area have an impact on the emulsion breaking speed and they are proven to be positively correlated. Meanwhile, in the case of small particle sizes, there is no statistically significant correlation between the physical properties of aggregates and the demulsification speed of emulsified asphalt, and the physical property of aggregates is not the main factor that affects the demulsification speed of the emulsified asphalt. On the contrary, the material properties of the aggregate, such as acid-base property and chargeability, are the dominant factors.
Highlights
With the advent of the world’s energy crisis and the enhancement of human consciousness of nature, emulsified asphalt, famous for its clean and eco-friendly properties, presents a prospect for large-scale use, and shows an increasing tendency of usage year-by-year [1,2,3].By using this kind of asphalt emulsion to build a road, no heating is needed at room temperature to spray, to pour into or mix, or to pave the surface or base layer of various structural pavements.Emulsified asphalt can be used in normal temperature construction and has the advantages of saving energy, facilitating construction, saving asphalt, and protecting the environment [4,5,6]
The objective of this study intends to give an explanation for the impact of emulsion asphalt breaking speed from the view of the surface characteristics of the aggregate, and it provides a theoretical reference for the aggregate factor, to determine the controllable demulsification of emulsified asphalt
In order to reduce the number of experiments and possible chemical interference in the study of physical properties, this test was only performed for limestone aggregates
Summary
With the advent of the world’s energy crisis and the enhancement of human consciousness of nature, emulsified asphalt, famous for its clean and eco-friendly properties, presents a prospect for large-scale use, and shows an increasing tendency of usage year-by-year [1,2,3] By using this kind of asphalt emulsion to build a road, no heating is needed at room temperature to spray, to pour into or mix, or to pave the surface or base layer of various structural pavements. Materials 2018, 11, 1488 low temperature cracking can be alleviated It can greatly improve the interlayer combination of asphalt pavement, and reduce the occurrence of various diseases in its service period. The objective of this study intends to give an explanation for the impact of emulsion asphalt breaking speed from the view of the surface characteristics of the aggregate, and it provides a theoretical reference for the aggregate factor, to determine the controllable demulsification of emulsified asphalt
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