Table of Contents
What is Fire Resistance Rating?
Fire resistance rating is used to measure the quality if fire fighting system. Fire resistance rating is define as duration of a passive fire protection system that can withstand fire protection test.
This can be quantified simply as a time scale, or it can include other criteria including evidence of function and fitness for purpose.
Fire resistance on the other hand, is the amount of time that a building material or assembly withstands standard fire exposure under specified test conditions.
Fire Resistance Rating Vs Fire Separation
Fire seperation is the technique in which building is protected from the spread of fire to nearby areas for a limited period of time. In this method fire resistant walls, floors, doors and ducts are used to seperate fire.
The period during which the element acts as a fire-stopping barrier is intended to prevent a fire from developing into a larger fire, to allow enough time for people in adjacent shelters to escape, and to minimize damage. increase.
If the fire protection element contains openings. For doors, interior windows, duct penetrations, or access panels, they must have the same fire rating as the element in question to maintain the fire performance characteristics of the structure.
Fire Resistance Rating of Concrete Slab
Concrete slab is made of high quality reinforcement coment concrete (RCC). Concrete slab does not burn when exposed to fire and does not release toxic fumes. Concrete has proven high fire resistance and can be considered virtually fire resistant in most applications.
This superior performance is primarily due to the constituents of concrete which, when chemically bonded to concrete, are essentially inert and form an important material for refractory construction, but heat Conductivity is relatively low. It is this slow conductivity that allows concrete to not only act as an effective fire barrier between adjacent spaces, but also protect itself from fire damage.
Fire resistance rating (FRR) Characteristics
FRR is a measure of the fire resistance of a material or assembly. This is determined by standardized fire tests and calculations. There is also a fire rating level (FRL), which is defined as the test result obtained after performing a fire resistance test.
FRR and FRL are used interchangeably, but FRR is the target fire resistance required for a design as determined by the fire engineer. The latter is the actual test value reached after the test is run. The FRR of a building material or system is determined according to ASTM E119 or Section 703.3. Test samples undergo rigorous testing under controlled conditions to infer the appropriate FRR. These exposure conditions may not reflect the actual indoor environment.
Measurement of Fire Resistance Rating
To determine a material’s fire resistance rating on an hourly basis, the fire assembly is placed in a temperature-controlled propane-fired furnace and the temperature is raised for a specified period of time in accordance with the standards set forth in the American Test and Building Materials Standard E119. Test method for fire testing of building structures and structures”. Building materials”. This time-temperature relationship is called the standard time-temperature curve.
Fire resistance ratings are calculated based on how long it takes for a particular material or structure to fail in a fire. It is measured from the moment the failure of the element occurs. This does not necessarily mean that the element will be destroyed at this stage.
A material’s FRR is measured using three criteria:
- Structural Validity: This is a stability test where the material continues to support the load during the test.
- Majesty: This stage measures the ability of the material to remain intact without cracking or cracking when ignited.
- Insulation: This level measures the material’s ability to slow the diffusion of heat from side to side.