4x105
n= 0.831og[ 4xS (2.18)
Sb
C, = (2.19)
Volumeof (aggregate + binder)
where
Sm = Stiffness of mixture (GPa or Psi)
Sb = Stiffness of binder (GPa or Psi)
But these equations are for mixtures with Cv between 0.7 and 0.9 and air voids
less than or equal to 3%. If the air voids is greater than 3%, Cv is recommended by Van
Draat, Fijn and Sommer (12)
C,= C (2.20)
1+H
where
H =(Pav/100)-0.03
Pa = Percent air voids in the mixture
The equations above are only valid for mixtures satisfying the following equations
C, = (1- C,) (2.21)
3
where
Volumeofbinder
C, (2.22)
Volumeof (aggregate + binder)
The use of Hekelom and Klomp's binder-to-mixture stiffness relationship is
restricted to the binder stiffness to be above 0.02GPa.