Revised guidelines for the use of fly ash, slag, and silica fume to improve concrete durability.
The currently active standard is (Fourth Revision). Since its publication, it has been updated with six amendments, with the most significant being the most recent one.
: Adjustments to maximum free water-cement ratios when using new cement types like Portland calcined clay limestone cement. Strength Testing
Amendment No. 4 primarily changed durability (cover requirements), crack width limits, maximum reinforcement percentages for seismic zones, and acceptance criteria for concrete strength.