In this article the cationic bitumen emulsions are characterized-as popular binder for various road emulsions. There are considered the specific features of cationic bitumen road emulsions' formulations. There are presented the functions and specificities of the acids application in cationic bitumen road emulsions. The literary review is presented on potentialities of ortho-phosphoric acids application instead of the traditional hydrochloric acid. Chemical peculiarities of application are presented (as well as advantages and drawbacks of application)-for both the traditional hydrochloric acid and forward-looking ortho-phosphoric acid. As the advantages of ortho-phosphoric acid application for cationic bitumen road emulsions one can mention: simple replacement of acid in soap solution preparation, less corrosive acid, higher pH emulsions, acid is easier to store, fewer fumes, not regulated in some countries, unlike hydrochloric acid. The potentialities are considered for application of ortho-phosphoric acid, as an effective component of cationic bitumen emulsion for application in various bitumen emulsion technologies, including the technologies for making protective slurry road pavements, among which the most widespread application was found by ortho-phosphoric acid in special fast-setting Slurry Surfacing systems, which possess a number of advantages over the same systems based on hydrochloric acid. The main of those advantages are as follows: such application eliminates the need for acid dopes in bitumen, provides a quick-traffic slurry system that works in cooler temperatures and at night, no need to change the usual latex or SBS grades, can use normal break retarders, mix controllable with cement in the field.

This article proves the possibility of replacing aggregates in concrete mixtures with rubber, which is obtained by grinding used car tires. It was found that the replacement of crushed coarse aggregate in the amount of 10 vol.% with ground rubber from used car tires increases the bending strength by 23% The compressive strength does not change significantly. When working in the subcritical stage of deformation (until the macrocrack shifts), concrete with the replacement of the coarse aggregate is preferred, as the energy consumption of which for elastic deformation (We) exceeds the base concrete. Analysis of the supercritical stage of deformation (macrocrack propagation) reveals that the replacement of fine and coarse aggregates negatively affects the value of total energy consumption for local static deformation in the main crack zone (Wl), which is by 1.35 and 1.14 times lower than the control concrete.

The article considers the possibility of using wastepaper sludge ash (WSA) as a soil reinforcement material for the construction of layers of road wear. Loamy sand, sandy loam, silty clay loam, silty clay were chosen as soils for strengthening. The maximum density of the soil skeleton at optimum humidity was established by the method of Proctor. Wastepaper sludge ash and Portland cement grade 400 were used separately for soil strengthening. Six compositions of strengthened soil for each type of soil were investigated according to the strength criterion of water-saturated samples at the age of seven, fourteen and twenty-eight days. The research results indicate that wastepaper sludge ash can be used to strengthen different types of soils with the achievement of following grades of stabilized soil: M10, M20, M40.