Abstract
This article is detected to the assessment of durable deformations of recycled mixtures made of foamed bitumen (MCAS) and emulsion (MCE). In the basic part of research and analyses, attention was focused on determining the scale of three-component composition modifying rheological phenomena of recycled mixtures and other selected features considering various methods of bituminous binder proportioning. Cement, hydrated lime, and dusts from cement dust extracting system were included in the composition hydraulic binder. In this paper, the effect of graining of recycled mixture was also taken into account. One of the main scientific aims of the paper was to evaluate the degree of changes in durable deformations described in the power model depending on proportions of elements making three-element hydraulic binder. In effect, it was pointed out that the influence of hydraulic binder differently affected the durable deformation of recycled mixture depending on ways of bitumen binder implementation. There-element binder exerted the highest influence on mechanical properties of mixtures with fine-grained mixtures made according to the MCAS technology. The presence of 4 groups of mixtures with different properties was demonstrated using the classification neuron net. Based on that information, a set of the most recommended solutions from the point of view of time deformation resistance, low sensitiveness to the load level at moderate stiffness was selected. The best representative among them was the arrangement with 20% of hydrated lime, less than 40% of CBPD dusts and 40 ÷ 60% of cement.
Highlights
Recycled mixtures are universally applied materials for basic and auxiliary base courses both in reconstructions and new road structures [1]
It should not be forgotten that the presence of each component in binder plays the role of a dispersion catalyst for foamed bitumen or a decomposition of bitumen emulsion causing a significant correctness of mechanical properties of recycled mixtures
The present observation was probably connected with a higher content of dusty-silty parts with larger specific surface stronger reacting with three-component hydraulic binder
Summary
Recycled mixtures are universally applied materials for basic and auxiliary base courses both in reconstructions and new road structures [1]. They may be executed in the technologies of foamed bitumen as well as bitumen emulsions. The application of adequately selected waste materials making the mix skeleton has a significant influence on durability of the designed recycled mixtures [3]. It should not be forgotten that the presence of each component in binder plays the role of a dispersion catalyst for foamed bitumen or a decomposition of bitumen emulsion causing a significant correctness of mechanical properties of recycled mixtures. Another work [10] proved that addition of rubber powder in MCE mixtures contributes to the reduction of their stiffness modules and indirect tensile strength
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