ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies. for Determining. Fire Resistance of. Concrete and Masonry. Construction Assemblies. Reported by ACI/TMS Committee A. CI/TMS M An ACI /TMS. Find the most up-to-date version of ACI at Engineering
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ACI 216.1-14 Code Requirements for Determining Fire Resistance of Concrete and Masonry
Built In Fire Safety The strength, purity, thermal stability, and insulative qualities of Buildex aggregate make it an excellent performer in fire exposure, both in poured concrete and SmartWall masonry. The model building codes recognize that the fire resistance rating of a concrete masonry unit cmu is based on it’s equivalent thickness and type of aggregate, using linear interpolation if aggregates are blended in the cmu.
A variety of aggregate combinations is possible. For this illustration, river sand is blended acii Buildex Expanded Shale Lightweight Aggregate to produce a 93 pound per cubic foot concrete masonry unit, which is the specified maximum density for SmartWall Systems.
SmartWall Fire Resistance see Afi 2.
SmartWall has a clear advantage in fire endurance, exceeding code minimums with an extra margin of safety. Can you afford to specify anything less?
FIRE RESISTANCE RATING OF CONCRETE MASONRY ASSEMBLIES
The fire resistance rating is based on the equivalent thickness of the concrete masonry unit and the type of aggregate s used in its production. Expanded Shale, Clay or Slate 3.
For example, an 8 inch hollow unit with cores filled would be considered as having a 7. The ratings are shown here in more detail to illustrate the difference in performance between different density units.
To calculate the fire resistance rating of a concrete masonry unit, its equivalent thickness and the proportion of aggregate s used in its production must be known. Table 3 lists the typical equivalent thickness for two-core concrete masonry units. Nominal Width Equivalent Thickness, inches 8 inch 4.
NCMA Tek Table 2 Calculation of the fire resistance rating for the pcf normal weight units in Table 1 was performed using the appropriate values from Table 2 and Table 3, using linear interpolation 261.1 the hourly ratings for each material. For the lightweight units 93 and pcf density the net volumes in Table 3 were reduced approximately 2. This adjustment recognizes ac fact that the ASTM C test method for net volume of concrete masonry units typically results in slightly lower values for lightweight concrete masonry.
This adjustment makes the calculations conservative, and they are expected to more closely match “real world” testing lab results, both for lightweight and heavy weight units. The following proportions were used for blending Buildex and sand: The mixes used our Marquette, Kansas plant aggregate and assumed a typical If the mixes were made with a lightweight aggregate of different density from another source, the aggregate aaci and the resulting fire resistance 261.1 will vary from those shown in Table 1.
The fire resistance ratings for lightweight units were calculated by linear interpolation using two steps, as illustrated in Table 4 below.
Fire resistance ratings greater than 4 hours are not listed in the building codes, so calculations acj the rating for units with an equivalent thickness greater 2161. that needed for a 4 hour rating was made by extrapolation, using the increase in equivalent thickness needed to raise the rating from 3 hours to 4 hours as the basis for the extrapolation. Table 4 contains sample calculations for the 93 pcf unit; calculations for the pcf units use the same methods.
Expanded Shale, Clay or Slate.