Smolyanyuk R. Pavement operating condition estimation based on the improved measuring methods of flatness and bond properties.

Object of study: Influence of pavement surface parameters on an automobile at different traffic modes. Aim of study: perfection of methods for pavement operating condition estimating by flatness and bond qualities based on laws of their influence on a suspender vibration at different traffic modes; laws of flatness and bond qualities change on the width of carriageway. Methods of study and equipment: simulation of an automobile driving on pavements with various flatness is carried out with using the program for flatness estimation according to IRI – "RoadRuf". Experimental studies of flatness and bond properties were carried out with the devices: „ТЭД-2М”, wood strip of 3 m, ЭПХ-ХНАДУ-1, "ППК-МАДИ-ВНИИБД" and by the method of „ sandy spot”. Theoretical and practical results: essentially new approach for estimating pavement flatness and bond qualities consisting in differentiation of influence of pavement roughness on an automobile suspender vibration at various traffic modes is proved along with an account of a heterogeneity of roughness distribution on width of a pavement and its complex influence; new techniques for estimating pavement quality were developed; the technique for assignment of repair works. Novelty: new laws of influence of pavement roughness on suspender vibration of automobiles were received at various traffic modes; new methods of flatness and bond qualities estimation consisting in definition of these parameters on the whole area of a pavement were developed. Degree of introduction: introduced as recommendations for flatness and bond qualities estimation, authorized and commissioned by Public Service of Highways of Ukraine. Range of usage: highways operation.