CONCRETE DRYING METHODS AND THEIR EFFECT ON FIRE RESISTANCE

LABORATORY METHODS ARE COMPARED FOR THE CONDITIONING OF CONCRETE PRIOR TO EXPOSURE TO THE STANDARD FIRE TEST (ASTM E 119) USING SLAB SPECIMENTS 3 BY 3 FT BY 6 IN. THICK. IN THE ARTIFICIAL CONDITIONING METHODS THE SPECIMENS WERE EXPOSED TO HEATED AIR IN A KILN CONTROLLED AT TEMPERATURE TO 200 F. SUCH KILN DRYING WAS CONDUCTED BOTH WITHOUT CONTROLLED HUMIDITY AND AT SEVERAL SELECTED RELATIVE HUMIDITY (RH) LEVELS. THE DRYING OF SOME SLABS WAS ACCELERATED BY INFRARED HEAT RADIATION. THE EFFECT OF THE SEVERAL DRYING PROCEDURES ON SUBSEQUENT FIRE ENDURANCE OF THE CONCRETE SLABS WAS EVALUATED IN TERMS OF THE RESULTS OBTAINED ON COMPANION SLABS NATURALLY DRIED IN AIR AT 73 F AND 35 PERCENT RH. ARTIFICIAL CONDITIONING METHODS CONSIDERABLY REDUCED THE TIME REQUIRED TO REACH TEST HUMIDITY BUT ENDURANCE PERIODS WERE SUBSTANTIALLY LOWERED. /PCA/

• Authors:
  • Abrams, M S
  • Orals, D L
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Cement kilns; Concrete; Drying; Fire resistance; Fires; Humidity; Infrared radiation; Laboratory studies; Ovens; Slabs; Testing
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213619
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 181
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM