The observation of public transportation bus bays in Lublin (and probably in other cities) made of concrete or stone blocks pavement shows that on many streets it is not very durable. The assessment of its durability was made for traffic on the KR-3 and KR-4 using mechanistic method that is used for road surfacing on the basis of its own program of multilayer systems in cylindrical coordinates. The article presents the results of the studies of typical constructions at public transportation bus bay.

The paper presents analysis of pavement structural performance on the section of national road DK 19 in 2000. FWD tests and analysis of elastic deflections were made after the first and thirteenth year of exploitation. The pavement stiffness moduli were calculated using author’s programmes SF-PL and ELMOD, adopting two- and three-layer elastic half-space models. The evaluation of stiffness moduli of base course made of mineral cement-emulsion mixture (MCEM) with addition of 5% (m/m) cement and 3% (m/m) asphalt emulsion was carried out. Statistical analysis of calculations and traffic analysis were made to determine the load-bearing capacity of the pavement construction and to estimate fatigue damage. It was found that the results of calculations with the three-layer elastic half-space model are characterized by a large variation, about 2-fold higher than in the case of the of the two-layer model. The calculated mean values of stiffness moduli at average surface temperature of 22°C in 2001 and 2013 were 6,191 MPa and 4,584 MPa respectively in the model of a double-layered elastic half-space.

A recognition indicator of the possibility of further use of the road during transferring transport loads are changes in the condition of the road surface. If the surface condition indicates incorrect parameters of its equality, rutting, or cracks, the road durability is qualitatively assessed. In this case, the actual load capacity rating and possible reconstruction of the structure begins. Values of dynamic defl ections can be used to recognize the modulus of elasticity and thus the possibility of assessing the durability of a structure. The mechanistic method is used to dimensioning the structure due to the movement planned. It allows a fl exible approach to further construction, giving the opportunity to assess whether part or all of it should be left or apply an additional layer to meet future requirements. The elastic modulus needed for this pavement structure design method for existing layers has been recognized by identifi cation as backcalculation methodology that have been used for many years.