Solid Concrete Wall Fire Rating

Fire endurance and fire resistance.

Solid concrete wall fire rating.

Aci tms 216 1 14 code requirements for determining fire resistance of concrete and masonry construction assemblies lists the minimum equivalent thickness of single layer concrete walls to meet fire resistance ratings ranging from 1 to 4 hours see table on following page. Fire ratings hours. For example for an 8 in. Unit width block type face shell solid equivalent thickness normal weight concrete siliceous gravel medium weight 105 125lb per cubic ft blended light weight under 105lbs per cubic ft expanded clay shale or slate 4 4 3 core regular solid.

Fire endurance of structures figure 5 shows the effect of fire on the resistance of a simply supported reinforced concrete slab. 13 mm a 1 in. 13 14 6 15 shall apply. For solid walls with flat vertical surfaces the equivalent thickness is the same as the actual thickness.

203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. The equivalent thickness is the theoretical thickness of the block if all the concrete was molded into a solid unit. The standard is used to hourly fire rating and to indicate wall s its durability during a fire. The requirements of astm c55 astm c73 astm c90 or astm c744 refs.

It is also referred to as a fire rating fire resistance classification or hourly rating. 6 6 6 2 core regular 2 core 75 solid solid. Fire resistancerated wall assembliesare commonly evaluated using astm standard e 119 ref. Fire ratings of concrete and masonry structural elements considers two factors.

51 mm thickness can be used in the joints of a 4 hour wall. The values in table 722 2 1 1 apply to plain reinforced or prestressed concrete walls. A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments. A fire resistance rating between the hourly fi re resistance rating periods listed may be determined by linear in terpolation based on the equivalent thickness value of the concrete masonry unit.

The minimum equivalent thicknesses of cast in place or precast concrete walls for fire resistance ratings of 1 hour to 4 hours are shown in table 722 2 1 1. Aci 206 provides the definition of these two terms. The hose stream test provides a meaningful measure of. A wall tested according to e 119 undergoes both fire exposure and water hose stream testing.

Fire rating fire resistance of concrete masonry units is determined by the equivalent thickness of the block and the type of aggregate. 25 mm thickness measured perpendicular to the face of the wall of ceramic fiber in the joint can be used in walls with fire resistance ratings up to 3 hours while a 2 in. It is calculated by multiplying the actual thickness by the percent of solids. These values are for solid walls or slabs.