Govorukha O. Improvement of technology of milled asphalt cold recycling for motor roads rehabilitation and reconstruction

The object of research is the technology of cold milled asphalt regeneration. The aim of the study is to improve the technology of cold milled asphalt regeneration by establishing patterns of influence of different binders on the processes of structure formation, properties and durability of concrete in pavement layers. In solving the problems of full-scale research methods used in the state of the pavement surfaces of roads, methods of experimental investigations of physical and mechanical properties of asphalt, a method of assessing the sustainability of materials to the accumulation of residual plastic strains, methods of statistical processing of experimental data and evaluation of economic efficiency. To determine the design characteristics, the method of experimental determination of deformation and strength properties. Structural analysis of pavement was performed on a computer using the program "Radon". Characteristic nature of influence of organic, mineral and complex binders on processes of structure formation, technological and physic-mechanical properties of cold mixes from milled asphalts and concretes on their base has been theoretically proved and experimentally confirmed. Technological regimen of production of cold mixes from milled asphalts and paving using these mixes have been studied, as well as design characteristics of concretes from cold mixes have been determined. Influence of binders of various origins in the composition of cold mixes on long-term water resistance and frost resistance of concretes on their base has been established. The scientific novelty. For the first time established the correlation dependence of the depth gauge on the compressive strength and shear at 50 °C. First the optimal cost of binders for the lubrication of the surface layer of pavement, arranged according to the technology of cold regeneration. First obtained the design characteristics of the cold concrete mixtures based on milled asphalt with different binders, as initial data for the calculation of pavement structures. The practical results. The results of the research have been implemented by road-building organisations when laying pavement courses and package of standard technical documentation on technology of production of cold mixes from milled asphalts and paving using it has been developed.