Resistance of Asphalt Concrete to Plastic Rutting Depending on Shear Resistance of Binders

The paper substantiates the relevance of studying the process of plastic rutting on roads with asphalt concrete pavements. It is hypothesised that the existing approach to monitoring quality indicators at the stage of production of asphalt concrete mixtures, including the components included in its composition, namely, monitoring the required resistance to plastic rutting of the resulting asphalt concrete pavements, has a significant drawback. The indicated drawback is that assessment of the possibility of using a specific batch of binder for preparation of asphalt concrete mixture is currently carried out only based on incoming quality control of the binder, by comparing the actual values of physical and mechanical characteristics obtained in the laboratory with the minimum standard values stated for the grade of binder material adopted in the design documentation, without taking into account the actual values of the quality characteristics of the binder used at the stage of laboratory selection of the mixture composition. This drawback, in some cases, can lead to failure to ensure the resistance of the asphalt concrete mixture to plastic rutting at the stage of its production.

The study contains the results of testing the shear resistance of batches of binders of one performance grade and the resistance of asphalt concretes prepared using these binders to plastic rutting. The results of the study confirm the hypothesis put forward by the authors; the dependence of the «average rut depth» indicator on the shear resistance of the binder aged by the RTFOT method is obtained and statistically substantiated.

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