Pavement Bases from Recycled Materials

Abstract

Road bases are the main bearing layers of the road pavement, the purpose of which is the perception of the load from cars and its distribution on the subgrade soil. The base structure is determined by calculation depending on the planned traffic load and traffic intensity and usually consists of two layers, and for capital coatings, the upper layer of the two-layer base is made of materials reinforced with binders. The base of the pavement is a rather expensive construction and it is important for its construction, where possible, to use local materials, as well as secondary materials, i. e. industrial and construction industry waste.  In the process of construction and repair works, the use of secondary raw materials can significantly reduce the cost of their implementation. Moreover, this practice not only reduces the cost of work, but also reduces the negative impact on the environment. The paper considers the possibility of constructing a pavement base from such secondary materials as spent molding sands (foundry waste), cement granulate (a product of crushing old cement concrete structures, construction waste) and asphalt granulate (a product of milling worn asphalt concrete pavements). In this case, the cost of the base is significantly reduced  while еnsuring its necessary strength. Spent sands were used as a leveling layer, cement granulate