THE SUBJECT OF NONDESTRUCTIVE TESTING OF concrete was covered in ASTM STP 169A, ASTM STP 169B, and ASTM STP 169C. The chapter in ASTM STP 169 was entitled “Dynamic Tests” and was authored by E. A. Whitehurst, whereas the chapter in ASTM STP 169B was entitled “Nondestructive Tests” and was authored by E. A. Whitehurst and V. M. Malhotra. The chapter in ASTM STP 169C was authored by V. M. Malhotra. This chapter updates the information presented in the previous publications.