METHOD TO ESTIMATE OPERATING STATE OF ASPHALT-CONCRETE ROAD PAVING Russian patent published in 2007 - IPC G01B5/00 

FIELD: motor road maintenance and repair, particularly to predict asphalt-concrete road paving rutting and type of paving repair.

SUBSTANCE: method involves determining minimal distance between rut depression surface and adjacent rut convexities in transversal paving profile; comparing the obtained rut dimension with threshold values and detecting paving zones to be repaired if H₁>H₂, where H₁ is maximal rut dimension, H₂ is threshold rut dimension, mm. Method additionally involves determining rut depression cross-section area S_d and that of rut convexities S_c. The depressions and convexities are created in road paving profile with respect to initial paving profile line and taking into consideration deformation of underlying road paving layer materials. If S_d/S_c>1.1 total road paving repair is destined. Here S_d is rut depression cross-section area, S_c is that of rut convexities adjoining rut depression, cm².

EFFECT: possibility to detect rutting reasons and to soundly destine repair works.

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