Aging of any concrete structure is a natural process, but it has become an urgent and critical problem in recent years, during which long-operating dams and nuclear power plants have begun to lose reliable life. A large number of infrastructures all over the world are over 50 years old and suffer from extensive deterioration that affects their serviceability. The high costs associated with preserving the aging structures along with the limited funds allocated for their maintenance pose significant technical and financial challenges, which require the systematic approaches for riskinformed condition assessment. Only in the USA, the American Society of Civil Engineers (ASCE) estimates a required investment amount of about 3.6 trillion dollars by 2020 to improve the condition of infrastructures to an acceptable level. This is more than twice the anticipated available funding level. Aging usually begins to appear in individual elements of the structures, leading to nonuniform or heterogeneous behavior. !e most well-known and widespread sign of structural aging is related to weakening of concrete mechanical properties.