In our country, there is no performance data available for CTB and CTSB layers in in-situ conditions. Furthermore, cement base layers can improve the fatigue behaviour of asphalt surface layer and subgrade rutting over the short and long term. Use of cement stabilization in granular material is an effective technique to increase the stiffness of base and sub base layers and also in the thickness reduction in comparison to conventional layers. There are conventional methods available for designing of flexible pavement based on the past experience whereas for the design of Cement Treated Base (CTB) and Cement Treated Sub Base (CTSB) layers no such conventional methods are available.
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