Wpływ dedykowanego spoiwa na właściwości mieszanek poddanych recyklingowi na zimno

The most important priority in the field of environmental protection is the implementation of the principle of closed-cyclematerials management in construction. This problem also plays an important role in road construction. Due to the increasingtraffic load of heavy vehicles and the impact of climatic factors, the road structure is subject to destructive processes that lead tothe loss of its durability in time. Therefore, the roads periodically need to be modernized. Very often, it is necessary to carry outcritical activities on the foundation to improve the load-bearing capacity of the pavement structure. As part of these works,large amounts of reclaimed asphalt and aggregate are obtained during milling of the lower structural layers of the surface.Applying the principle of closed-cycled material management, the most effective technology for using this material is its reconstructionusing deep cold recycling technology. This technology uses hydraulic binder and bituminous emulsion, andcurrently, more and more often, foamed bitumen. Due to the fact that the materials obtained from road structure layers are ofvery different quality, it is necessary to use a binder that will be dedicated specifically to the materials used (reclaimed asphaltpavement, reclaimed stone). In experiment Portland cement CEM I 32.5, hydrated lime and cement by-pass dust as a byproductobtained from cement plants were used. All components were mixed in various proportions controlled by experimentplan. The influence of a dedicated binder on absorption, dynamic modulus, phase angle in the specific temperature range andrutting resistance of a cold recycled mixture designed with reclaimed asphalt pavement, reclaimed aggregate and foamedasphalt was examined. The obtained test results were subjected to statistical analysis using the ANOVA test in order todetermine the significance of the influence of individual components of the dedicated binder on the considered parameter of thecold recycled mixtures. It was determined that the dedicated binder used for the tested recycled asphalt mixture ensures itsmost favorable parameters when contains: 40% CEM I 35.2, 20% hydrated lime and 40% cement by-pass dust.