The typical scope of work may consist of: *Soil borings, materials sampling, transport & disposal; *Soils testing to provide soil percent compaction
and soil classification; *Pavement testing to provide pavement composition, thickness, and density; and *Concrete testing to provide material composition, temperature, slump, air, shrinkage, and strength.
However the results from some other researches indicated a rather poor correlation between PFWD modulus and percent compaction for pavement layers (James et al.
First, the stiffness modules and percent compaction values of a certain layer (fourth layer with two replacements) were considered to ignore the effect of underlying layers stiffness in the analysis.
PFWD] is PFWD stiffness modulus (MPa); Comp is percent compaction (%) and w is moisture content (%).
3) to investigate the combined role of percent compaction and water content on PFWD modulus:
where EPFWD is PFWD stiffness modulus (MPa), Comp is percent compaction (%) and RWC is water content relative to optimum.
Hence, it is possible to achieve a direct correlation between percent compaction and stiffness modulus upon determining stiffness modulus at certain moisture content (e.
86) indicates that there is a good correlation between percent compaction and stiffness modulus for the tested conditions.
The following exponential regression model was obtained between percent compaction (Comp) and PFWD modulus ([E.
72 indicates that there is a reasonable correlation between stiffness modulus and percent compaction for different unbound pavement layers.
The relationship between PFWD stiffness modulus with percent compaction and moisture content for laboratory conditions was provided in Eq.