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Fatigue life comparison of recycled cold mixes with different type of bitumen binder

Buczyński P.

Structure and Environment

2016

Vol. 8, no. 4

217--223

Knowledge of the fatigue life is required to properly predict pavement structure reliability with respect to the number of loading cycles. The possibility of using foamed bitumen and bitumen emulsion as binders in the composition of road bases makes it necessary to identify the influence of the binder type on the service life of these layers through dynamic tests. Obtaining proper physical and mechanical parameters does not necessarily ensure the correct evaluation of the recycled base quality. Satisfaction of the quality-related requirements does not guarantee the provision of the required fatigue life parameters. Cold recycled bases with cement should work within the viscoelastic range due to hydraulic bonding in the structure. If this range is exceeded, a considerable rise in strains occurs as a result of brittle fracture, leading to the loss of fatigue life. The paper presents the results from the fatigue tests of recycled bases. The amount of bitumen used in both cases was 3% and 5%. For the production of the bitumen emulsion and foamed bitumen, 70/100 pen bitumen was used. Portland cement I 32,5R was applied as a binder. The binder comprised 3% of the mineral composition of the recycled base layer. Fatigue tests were performed in compliance with the requirements of enclosure E of PN-EN 12697-24 at a constant normal stress of 250 kPa, 375 kPa and 500 kPa. The results were used to compare the effects of the binder type applied to the recycled base and determine the service life in terms of the stress applied.