Residual Resource of Road Surfacing on High-Traffic Roads

Introduction. An urgent task facing the field of road maintenance is an objective assessment of their residual resource. The existing methods are typically subjective or require that complex procedures are carried out. The aim of the study is to develop a new approach to such an assessment based on instrumental measurements.

Materials and Methods. The object of the study is road surfacing of highways. The method is based on a model that relates the amount of elastic deflection of the coating to the estimated number of loading cycles until the strength has been exhausted. Deflection was measured using a Falling Weight Deflectometer. The technique allows one to adapt the model to a variety of conditions by calibrating the coefficients.

Research Results. Based on the suggested model, a four-level scale of the condition of the road surface has been designed according to the size of the residual resource: a normative, satisfactory, pre-maintenance and critical one. In order to increase the reliability of the estimate, the median value of the resource is used as the calculated value for the measuring point, and its weighted average value is used to characterize the entire site.

Discussion and Conclusion. The developed approach makes it possible to quantify the residual resource based on instrumental data. Implementing this technique would increase the objectivity of diagnostics and assist optimal repair planning. The prospects of the study are related to the further adaptation of the model for a variety of road and weather conditions. 

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