Experimental testing and assessment of stiffness modulus and fatigue of various cold recycling mixes

Abstract

Cold recycling in pavement rehabilitation and new construction records growing utilization and forms a part of sustainability strategies in road engineering. Usually reclaimed asphalt pavement (RAP) is used for mixes where bitumen emulsion or bitumen foam is used together with suitable hydraulic binders. Besides RAP there are possibilities of part substitution by secondary or waste materials from quarries.
From the technical point of view, these mixes have to be tested by traditional and more advanced testing methods explaining performance behavior of these mixes. The performance and related characteristics can be in best manner described and assessed by rheologic properties. During the experimental work the focus concentrated especially on measurement of stiffness modules at different temperatures (5°C, 15°C, 27°C) representing different pavement conditions during the year and fatigue tests for different stress conditions. Results and their comparison for different mixes are be presented and discussed in the paper.