Features of the hot recycling method used to repair asphalt concrete pavements

Abstract

The recycling methods used in the construction and repairing of asphalt concrete pavements are being constantly improved, and the improvements mostly fall under one of the following common avenues of innovation: developing new binders based on bitumen and cement; developing new varieties of asphalt concrete and other materials having an equivalent utility and function; and developing additives that can be used in the production of new types of binders that can enhance the performance properties of the pavements. This article aims to develop the composition and determine the physical-mechanical and structural-rheological properties of asphalt concrete reclaimed by the hot recycling method and reinforced by fiber of fly ash from thermal power plants (TPP). The author of this article developed a mechanism for the interaction between fiber and bitumen in asphalt binder and acquired an optimum composition of hot granular asphalt concrete. During the research, the author evaluated the utility of fiber used as an additive in reclaimed asphalt concrete, studied its effect on the properties of hot reclaimed asphalt concrete, and examined the technological and performance properties and durability of the material obtained. The fiber of fly ash used in the hot recycling method made it possible to reduce the cost and ensure the high quality and durability of the structural layer of road pavement. Our experiments with analyses of the obtained composition indicated that employing it in the construction of the structural layer of road payment would result in superior structural integrity. Hot recycling made it possible to obtain thick bound layers characterized by the homogeneity of the material. For the first time, the author studied the effect of using fiber of fly ash from Chinese TPP in hot reclaimed asphalt concrete, and the results have proved the rationality of using this composition.

Development of building materials based on a high content of fly ash and polycondensation products from Chinese heat and power plants

“…In order to define the possibility of its use as an additive in concrete, it is necessary to determine the content of harmful components in ash, which can be stated as follows: sulfur content (defined in this research); unburned particles of coke and semicoke coal determined by weight loss on ignition; free calcium and magnesium oxide; alkali metal oxides. They worsen the physical and mechanical properties of concrete and its technical and performance indicators and sometimes lead to concrete deterioration [11].…”

Technology for improving modern polymer composite materials

“…Thus, CNTs, filled with carbides of refractory metals (TAC, NBC, and MOC) can be used as superconductors by the deposition of lithium on a porous substrate of aluminum oxide nanowires of Fe 0.3 Co 0.7 alloy with a diameter of 50 nm [34]. Moreover, fullerenes and fullerene-based composite nanomaterials are promising materials for manufacture of various kinds of optical and photoelectric materials [35][36][37][38][39][40][41][42][43][44].…”

Development of the Universal Working Equipment of the Excavator for Preparation of Materials Based on Waste during the Road Building

“…At the same time, one of the most material-intensive, financial and energy-consuming operations in the road construction, is the production of building materials and its transportation to the place of road building. This fact determines the relevance of the development of new cheaper materials for road building [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

“…Organizations involved in the road building widely use artificial materials made on the basis of man-made waste, for example, based on the blast furnace slag, as an alternative to natural materials [9][10][11].…”

“…Mixer 1 performs the pre-mixing of the premoistened (for better adhesion) crushed stone with a liquid mixture containing cement, silica fume and crushed (to a powder state) blast-furnace slag [9]. Next, the slag crushed stone enters into the mixer 2, which fills pores with a dry mixture of a similar composition.…”