The Effects of Bituminous Binders on Cold Recycled Mixes Prepared by the Foamed Bitumen Technology
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The foamed bitumen technology is experiencing a global renaissance with rather extensive development with respect to its application and research. However, the variability of available bituminous binders for utilization within the technology is quite large; therefore, a general methodology of quality parameters determination for foamed bitumen and the requirements for mixes bound by this type of binder must be specified. Different types of straight-run bituminous binders can be used for producing the foam. Besides the pen grades, the source of the bitumen might have important effect on final foamed bitumen quality given especially by its expansion ratio and stability of the foam as well. Experimental study has been done to compare different types of bitumen from different sources to assess the effects on the foamed bitumen and on cold recycled mixes produced by these binders. In parallel the effect of a suitable foaming agent has been assessed as well. The foamed bitumen was analyzed by its expansion ration, half time defining the stability of the foam and the so called foam index. Cold recycled mixes were produced with one type of reclaimed asphalt and different foamed bitumen. For the mix assessment indirect tensile strength, water susceptibility and stiffness have been considered. Results are presented in this paper.
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