Search

Strength of the pavement is a characteristic of the construction that determines the ability to continuously accept the influence of traffic flow and air-climate factors. The strength of the surface course is the most important transport-operational indicator that affects the technical level and operational condition of the road, in particular, the ability of pavement to withstand the repeated impact of loads from passing vehicles and reliability coefficient of the transport process during the period of rehabilitation. Taking into account this situation, experimental research studies were carried out to study the effect of pavement temperature changes on the strength of the road surface on the 11-12 km section of the 4P2 highway, which is the object of research. As a result of the research work, the regression graph was constructed. The modulus of elasticity of the pavement calculated for the cases surface course temperature 30 °C and 60 °C by the equation defined in the graph of the dependence shown in the figure above is equal to 753 MPa and 572 MPa, respectively. The difference is 181 MPa. [ABSTRACT FROM AUTHOR]

Information on the effect of gibberellin on the growth of horse chestnut seedlings shows that in the variants with gibberellin treatment, the growth process of two-year-old seedlings was significantly accelerated. If, when treated with gibberellin at a concentration of 25 mg / l, the plant height was 42.5 cm, the trunk diameter was 13.7 mm, then in control these indicators were 36.4 cm and 12.3 mm, respectively. [ABSTRACT FROM AUTHOR]