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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2116.1 The following proportions were used for blending Buildex and sand: The system also is somewhat inflexible in that little variation from the original tested wall assembly is allowed including unit size, shape, mix design, ingredients, and even the plant of manufacture. It is a multi-functional system in a single package:.
Fire Resistive Ratings
Finishes ack are assumed to contribute to the total fire resistance rating of a wall must meet certain minimum installation requirements. Table 4 contains sample calculations for the 93 pcf unit; calculations for the pcf units use the same methods.
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. It does not matter which side is exposed to the fire. Built In Fire Safety Concrete masonry units manufactured with Norlite aggregates are readily available throughout the Northeast. The calculated fire resistance method is based on extensive research and results of previous testing of concrete masonry walls. Certain finishes deteriorate more rapidly when exposed to fire than when on the non-fire side of the wall.
Consult your representative for more information. It should be noted that when finishes are used to achieve the required fire resistance rating, the masonry alone must provide at least one-half of the total required rating. The fire resistance rating is based on the equivalent thickness of the concrete masonry unit and the type of aggregate s 2116.1 in its production. Equivalent thickness is essentially the solid thickness that adi be obtained if the same amount of masonry contained in a hollow unit were recast without core holes.
This is then added to the base concrete masonry wall equivalent thickness which is used in Table 1 to determine the fire resistance rating. The listing service approach allows the designer acci select a fire rated assembly which has been previously classified and listed in a published directory of listed fire rated assemblies.
For partially grouted walls where the unfilled cells are left empty, the equivalent thickness for fire resistance rating purposes is equal to that of an ungrouted unit. Fire resistance ratings greater than 4 hours are not listed in the building codes, so calculations of the rating for units with an equivalent thickness greater than 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.
The document highlights code sections related to masonry and fire-resistance.
Typical equivalent thickness values for these units are listed in Table 2. The equivalent thickness of a 261.1 unit is equal to the percentage solid times the actual thickness of the unit. Plaster and stucco need only be applied in accordance with the provisions of the building code.
This is to assure structural integrity during a fire. For partially grouted concrete masonry walls using 8-inch thick cmu rated at 2 hours, the fire-resistance rating can be increased to 4 hours when ungrouted cores are filled with any of the following: For multi-wythe walls of clay brick and concrete masonry, use the values of Table 3 for the brick wythe in the above equation.
Table 7 applies to finishes on the non-fire exposed side of the wall and Table 8 applies to finishes on the fire exposed side. Methods for Classification of Fire Resistant Ratings of Concrete Masonry The fire resistive properties of concrete masonry units are generally classified by hourly fire resistance ratings.
It is a multi-functional system in a single package: The third option, testing of representative elements of the construction in accordance with standard fire test methods is generally not practical due to the expense of the test and time required to build, cure, 26.1 test representative specimens. Cover requirements may be provided by masonry units, grout, or mortar.
For this illustration, river sand is blended with 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. Expanded Shale, Clay acj Slate 3.
ACI Code Requirements for Determining Fire Resistance of Concrete and Masonry
By drawing on this data, methods of calculation have been developed to determine fire resistive ratings. Noncombustible, stable in response to fire Structurally sound, exceptional seismic performance No toxic gases released when heated Durable, long-lasting, with low life-cycle costs.
Lath nails spaced at 12 in. This is accomplished by insuring that the temperature rise of the tensile reinforcing does not exceed o F o C during the rating period.
For the most part, the contents of the Standard are not new, but rather are a compilation and refinement of the many documents previously published by the various segments of the masonry and concrete industry.
Home About Projects Contact Us. The calculated equivalent thickness of a concrete masonry wall xci include the thickness of applied plaster and lath, gypsum wallboard, or gypsum plaster. Customer Service Login Apply for account.