THE FUNDAMENTALS OF CONCRETE PERFORMANCE at high temperatures, including fire resistance, are well established. This subject was authored in ASTM STP 169 and 169A by P. H. Peterson under the title “Resistance to Fire and Radiation.” Peter Smith authored the chapter in STP 169B entitled “Resistance to High Temperature” and the one in STP 169C with the present title. Accordingly, major revisions have not been necessary, though new products, applications, and research results are addressed, such as those arising from the use of high-strength concrete.