Fire Resistance Ratings
Deemed to apply to certain structural members
Identification of Specimen:
The sponsor identified the specimen as a loadbearing limestone block wall, using Perason Quarry, second strata, Limestone blocks
BRUHN Limestone 295 Commercial Street West Mount Gambier
BRUHN Limestone 295 Commercial Street west Mount Gambier
Australian Standard 1530, Methods for fire tests on building material, componentsand structures, Part 4- 1990, Fire resistance tests of elements of building construction
Description of Specimen:
The specimen comprised a single leaf loadbearing limestone block wall nominally 3000mm high x 3000mm wide x 125mm thick. The 290mm high x 600mmlong x 125 mm wide blocks were laid in stretcher bond with full mortar joints using a mortar mix comprising one part cement, one part lime and six parts sand by volume.
Total load was 90 kN
The specimen was unrestrained on the vertical walls the vertical gap between specimen frame and wall was filled with compressed ceramic fibre
The furnace is lined with refractory bricks and materials with the thermal properties as specified in AS 1530.4-1990.
The temperature in the furnace chamber was measured by 9 K-type thermocouples housed in high – nickel steel tubes substantially sealed at the exposed ends.
Test performance results
Structural Adequacy – 133 minutes
Integrity – 127 minutes
Insulation – 134 minutes
For the purposes of building regulations in Australia, the FRL of the test specimen was 120/120/120
For the purpose of AS 1540.4-1990 the results of these fire tests may be used to directly assess fire hazard.
Mr GRG Everingham: Testing Officer
Mr Garry E Collins: Senior Fire- Engineering Scientist for Manager, Fire Technology