The Impact of Homogeneity of High Modulus Asphalt Concrete Layer on Low-temperature cracking Jozef JUDYCKI, Piotr JASKULA, Bohdan DOLZYCKI, Marek PSZCZOLA, Mariusz JACZEWSKI, Dawid RYS, Marcin STIENSS Gdansk University of Technology Department of Highway Engineering Narutowicza str. 11, 80-233 Gdansk, Poland jozef.judycki@wilis.pg.gda.pl Abstract During winter season of 2012 numerous transverse cracks developed in high-modulus asphalt concrete (HMAC) base of newly constructed motorway. Pavement cracked both in transverse joint locations and in the area between them. Research which was conducted during investigation of the causes and mechanisms of cracking consisted of: field examination, laboratory testing of specimens cored out of the existing pavement, computational analyses and effect of pavement ho- mogeneity on transverse crack frequency. This paper focuses mainly on impact of homogeneity of asphalt layer on number of transverse cracks. The field investiga- tion of analyzed motorway section includes visual assessment of homogeneity and number of cracks. Laboratory test conducted on specimen cored out of the pave- ment allowed to assess volumetric properties: binder content, voids content and compaction degree, and mechanical properties: indirect tensile stiffness modulus and strength. Analyses of HMAC layer properties revealed their impact on the number of transverse low-temperature cracks observed in field. It was found that a less effective compaction contributes to increase in the number of cracks. Quality and homogeneity of pavement courses have a considerable effect on mechanical properties of HMAC. As analysis showed, intensity of cracks is well correlated with mechanical properties and homogeneity of asphalt layer. Keywords High modulus, Low temperature, Transverse cracking, Hard bitumen. 1 Introduction The paper presents investigation of pavement in newly constructed, 61 km long section of motorway A1 in Kujawsko-Pomorskie region, in the middle part of Po-