Evaluation of PFWD and DCP as Quality Control Tools for Sub- Grade of GW and SW Soils

The Stiffness modulus is one of the necessary inputs in mechanistic-empirical pavement design and QualityAssurance/Quality Control (QA/QC) of pavement layers construction. The use of Portable Falling WeightDeflectometer (PFWD) for measuring the stiffness modulus of unbound pavement layers is increasingworldwide. The modulus can also be indirectly calculated by the results of other available devices. TheDynamic Cone Penetrometer (DCP) is an easy-to-access device for evaluating the strength of unboundpavement layers in a cheap, easy and fast way. In this study, the stiffness modulus of PFWD and penetrationrate of DCP was correlated for the sub-grades ranging from well-graded sand (SW), which is highlyconsisted of SiO2 and Al2O3, and well-graded gravel (GW) classification. In addition, the results indicatedthat a good correlation exists between PFWD moduli and DCP results and also for the precise evaluation ofthe SW soil modulus with a considerable amount of SiO2 and Al2O3, a coefficient factor, of C

Keywords:

Stiffness Modulus , PFWD , DCP , mechanistic-empirical , QA/QC