[01] Saad Issa Sarsam, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq. [02] Amal Mahdi Ali, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.

Pavement surface texture determines the comfort riding quality and serviceability conditions for road users. Pavement macrotexture has great impact on drainage and skid attributes. The pavement surface texture should maintain low levels of noise and roughness. Many transportation departments perform routine check for skid resistant and texture, the type of equipment used for testing varies depending on the preference of each transportation department. The macrotexture of pavement surface is usually assessed using the traditional sand patch method or the automated lazier scanning of the surface. It was felt that there is a need to introduce the close range photogrammetry technique which is simple and can be conducted with lower price than lazier scanning, and it is lower labour consuming as compared to sand patch method. The aim of this work is to study the feasibility of using the close range photogrammetry in assessing the macrotexture condition of the pavement. The methods used in this work consisted of measurement the macrotexture of cement concrete and asphalt concrete pavement surface in the field using both techniques, the sand patch method and the close range photogrammetry technique. Visual inspection of pavement surface, was done by a walking along the pavement sections and selecting the spots for macrotexture assessment. Stereo images capture and sand patch test were conducted for each of the 28 selected spots on the pavement surface for the two types of pavement. The test results were verified, modelled and correlated to each other. It was concluded that such modelling could provide instant data in the field for pavement condition which may help in pavement maintenance management. Moreover, the photogrammetric technique could provide a permanent documentation of the pavement surface condition, which could be referred when needed.

Macrotexture, Sand Patch, Close Range Photogrammetry, Modelling

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