Figure 17(a) describes characteristics of tensile moduli of concrete with W/C = 55% and coarse aggregates of different volume fractions. The vertical axis in the graph presents the tensile Young’s moduli ratio of concrete to coarse aggregate. Herein, the model results are obtained from the assumptions shown in Table 5. The figure demonstrates that the tensile modulus of concrete increases with increasing the volume of coarse aggregates since the aggregates have a higher Young’s modulus than the mortars. It is also noted that tensile moduli of concrete having more coarse aggregates (i.e., larger vol. fractions) than the solid volume content of coarse aggregates [17] are unavailable. Figure 17(b)presents a similar set of curves corresponding to concrete with W/C = 30%. Both figures describe that the tensile modulus of concrete develops rapidly at early age and gradually plateaus at later ages.