- Author
- Mitchell, N. D.
- Title
- Fire Tests of Steel Columns Protected With Siliceous Aggregate Concrete.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
- BMS 124, May 25, 1951, 14 p.
- Keywords
- columns | steels | fire tests | aggregates | concretes | fire endurance tests | spalling | slabs (members) | steel columns
- Abstract
- Results of fire-endurance tests of four 6-in. steel H-columns protected with concrete made with highly siliceous aggregates are presented. The concrete was of 2-in. thickness around the column shaft and filled the reentrant spaces. The aggregates investigated were river gravel and crushed quarts. The columns were subjected to load throughout the tests. The loads on three columns of magnitude as computed aby a standard formula for allowable load were constant. One column sustained a double load throughout the earlier part of the test. The fire-endurance limits ranged from 2 hr 50 min for a column with crushed quartz aggregate concrete to 3 hr 34 min for one with gravel aggregate concrete. The results were consistent for columns protected with gravel aggregate concrete, and with reasonable limits for columns covered with quartz aggregate concrete. The results of the column tests with respect to lack of spalling of the concrete were confirmed by tests on concrete wall slabs made with the same or like aggregates.