![]() proposed study in the proposal includes five major tasks: 1) synthesis of local road. An example to illustrate how climatic considerations can be incorporated into the AASHTO design is presented. pavements based on pre-mechanistic/empirical AASHTO methodology. ![]() By knowing the asphalt grade and the mix properties, the weighted, effective asphalt‐layer coefficient is calculated. A rational method is proposed to select the appropriate asphalt grade to minimize both low‐temperature cracking and rut depth. For a pavement structure to be structurally adequate, the proposed. The impact of the ambient temperature on the asphalt‐concrete layer is evaluated by considering the interactive result of temperature and fatigue damage the concept of weighted effective dynamic modulus is thus used. This tool follows AASHTO Guide for Design of Pavement Structures (1993) as closely as. it allows higher subgrade compressive stains to be developed. ![]() As it can be seen the equation developed by AASHTO6 gives the most optimistic results, i.e. Through a sensitivity analysis of the new AASHTO equation, the change in the structural number required to offset a reduction in the subgrade resilient modulus due to an increase in moisture content is evaluated an adjusted structural number is thus calculated. INTRODUCTION The structural design guide developed consists of nomographs from which the thickness of. Climatic factors considered include seasonal changes in the subgrade moisture content and the annual variations in the ambient temperature. This research is undertaken to study and assess carefully the effect of climatic factors on the new American Association of State Highway and Transportation Officials (AASHTO) design for flexible pavements. The AASHTO pavement design equations attempt to consider the effects of drainage on pavement performance.
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