With limited funding and a desire to reduce environmental impact, there is a lot of pressure on road Authorities to develop decision making policy to manage better, build and maintain the road network sustainability. One of the solutions is to use various life cycle analyses. Numerous tools are available for different analyses, but they usually evaluate the construction from one perspective (economical, environmental, or social). Therefore, it was decided to develop a tool, which combines economic (Life Cycle Cost Analysis) and environmental (Life Cycle Assessment) analyses. The given study presents the methodology of the self-developed calculation program, which compare full-depth road constructions. Paper also shows shortcomings when calculation does not include all life cycle processes. In this study, five different road pavement constructions and reconstruction plans were compared. The difference between these pavements was in the layer thickness, recycled asphalt content in asphalt layers and the use of cement or fly ash in the road base layers. The results showed that the full depth reclamation technology in comparison to the full-depth removal and replacement reduce emissions by 60% and costs by 50%.

According to scientific research from different countries, crumb rubber obtained from end-of-life tires (ELT) during processing can improve the properties of the asphalt mixture, thereby extending the service life of the road surface. This paper presents the modification of bitumen with industrial rubber waste. The modification of bitumen for roads is considered one of the most suitable and popular approaches. This research paper describes the details of using different types of crumb rubber as bitumen modifiers. The modified bitumen’s main physical and mechanical characteristics were determined after conventional tests: penetration and ductility, softening point, and Fraas brittleness point. In order to obtain a rubber–asphalt concrete mixture with improved performance characteristics, the viscoelastic and rheological properties of rubber–bitumen binders and their comparison with polymer–bitumen binders were also studied. The research results show that with increasing temperature, the values of viscosity, shear stress and complex shear modulus of all studied bitumen systems decrease, the values of the phase shift angle increase, and the size of the rubber particles has a greater influence on the properties of bitumen systems.

Promocijas darba gaitā izstrādāta metodika un rīks, ar ko iespējams novērtēt ceļa segas projekta ilgtspēju vides un ekonomiskajām dimensijām. Metodika un rīks balstīts dzīves cikla tehnikās. Izstrādātā metodika un rīks tika izmantots šajā promocijas darbā, lai novērtētu dažādu materiālu un tehnoloģiju vides un ekonomiskos parametrus. Novērtētie materiāli un tehnoloģijas ir ļoti plāna asfalta virskārta (BBTM), etilēna-oktēna-kopolimērs bitumena modifikators, ar nolietoto riepu gumiju modificēts bitumens, sarkanie māli kā bitumena modifikators, vieglie pelni ceļa segas pamatnes pastiprināšanai un ceļa segas pārbūves tehnoloģijas.