, Cezary Szydłowski
, Mariusz Jaczewski
https://doi.org/10.7409/rabdim.025.027
In recent years, cold recycling using mineral-cement-emulsion (MCE) mixtures has become a common practice in the reconstruction of the old, deteriorated roads. The course made of MCE mixture, similarly to other materials used in pavement engineering, changes its properties with time. While the properties of such mixtures are currently quite well known, the biggest issue of their properties after many years on the pavement, when the layer is subjected to traffic and climate, remains. This article presents an evaluation of the properties of six road sections with an MCE base layer after around 10 years of service life. Sections located on Voivodship Road No. 172 differed in the amount of binding agents (cement/emulsion) used. Results of mechanical properties determined in 2023 in the laboratory on core specimens were compared with properties determined during the construction of the sections. Additionally, the results of the Falling Weight Deflectometer (FWD) test (deflection, deflection bowl, and backcalculated modulus) were analyzed considering the combinations of binding agents. Results and analysis indicated that stiffness moduli did not decrease significantly during ten years of pavement service life; simultaneously, Indirect Tensile Strength ITS increased up to twofold for some sections. The obtained results show that the behavior of the MCE mixtures in the field is not as unambiguous as in the laboratory and needs further research.
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