Effect of Incorporating Hybrid Fiber on Fire Resistance of High Strength Concrete Columns 1 2 3 4 80N/mm 2 200N/mm 2 150N/mm 2 180N/mm 2 180N/mm 2 200N/mm 2 3 Fire resistance of High strength reinforced concrete columns with specified design strength of 80N/mm 2 to 200N/mm 2 were conducted by loaded fire resistance tests. High strength concrete column without fiber showed explosive spalling and fire resistive period of columns were less than 2 hours. Incorporating polypropylene fiber to concrete of 150N/mm 2 or less was shown to be effective for preventing spalling of concrete and prolonging fire resisting period. For more than 180N/mm 2 columns, 0.33 vol of polypropylene fiber were not sufficient for preventing explosive spalling. Incorporating both polypropylene and steel fiber was determined to be effective to maintain 3 hours of fire endurance. RCFc 100N/mm 2 50RC RC 1 2 15 6 7 89 80N/mm 2 1011 1General Manager, Research & Development Institute, Ph.D. 2Ph.D. Research Fellow, Research & Development Institute, Ph.D. 3Chief Researcher, Research & Development Institute 4Professor, Graduate School of Engineering, Tohoku University, Dr. Eng. 1
12 1314 80N/mm 2 1517 150N/mm 2 80N/mm 2 200N/mm 2 Table 1Fc 80N/mm 2 210N/mm 2 80100N/mm 2 130150N/mm 2 180200210N/mm 2 3 PP c F c N N B vol. vol. A N/mm 2 N/mm 2 mm c A cm 2 c F c A c c B Fc80-00 93 0.00 8-D19 D10@100 0.29 Fc80-06 80 91 0.055 400400 1600 SD490 SD345 0.33 0.29 365390 4.39 Fc80-11 91 0.11 pg=1.43pw=0.82 0.29 Fc100-00 113 0.00 8-D16 D10@100 0.29 Fc100-06 100 113 0.055 350350 1225 SD490 SD345 0.33 0.29 365390 3.44 Fc100-11 112 0.11 pg=1.30pw=0.82 0.30 Fc130-00 158 0.00 8-D16 D10@100 0.25 Fc130-11 130 152 0.11 350350 1225 SD490 SD345 0.31 0.26 180205 4.10 Fc130-33 153 0.33 pg=1.30 pw=0.82 0.26 Fc150-00 178 0.00 8-D16 D10@100 0.22 Fc150-11 150 175 0.11 350350 1225 SD490 SD345 0.27 0.23 180205 3.02 Fc150-33 170 0.33 pg=1.30pw=0.82 0.23 Fc180-00 189 0.00 Fc180-22 185 0.22 12-D16 0.22 U6.4@50 Fc180-33 180 185 0.33 350350 1225 USD685 pw=0.73 0.25 0.22 Fc180-22-S10 187 0.22 1.0 pg=1.95 0.21 Fc180-33-S10 185 0.33 1.0 0.22 Fc200-00 216 0.00 0.0 0.25 0.28 Fc200-00-S05 201 0.00 0.5 0.30 0.30 0.21 180200 2.99 Fc200-00-S10 197 0.00 1.0 0.30 0.31 Fc200-17-S05 200 200228 0.17 0.5 12-D19 U7.1@50 0.30 0.30 400400 1600 USD685 180210 4.60 Fc200-33 196 0.33 0.0 pw=0.80 pg=2.15 0.25 0.31 Fc200-33-S05 198 0.33 0.5 0.30 0.31 Fc200-33-S10 201220* 0.33 1.0 0.30 0.30 Fc210-11-S05 210 225233* 0.11 0.5 0.29 0.26 2.96 Table 1 2
PP Fc80 Fc100PP00.055 0.11vol.06 Fc130Fc150PP0 0.110.33vol.06 Fc180Fc200Fc210PP 00.33vol.01.0vol. 1123 Fig.1 2400mm1800mm Fc80 Fc18030mmFc200Fc21035mm Table 1Fig.1 Fig.1 350350mm400400mm RCSD490USD685SD345U6.4U7.1 Table 2Table 3RC PP 1318 Table 2 B10 A3.08g/cm 3 5920cm 2 /g B3.01g/cm 3 6650cm 2 /g 2.66g/cm 3 1.75 2.67g/cm 3 1.75 2.65g/cm 3 1.13 2.66g/cm 3 1.75 AE AESP1SP2SP3 PP Fc8020048mFc21019m Fc8010019mmFc13021010mm 30mm0.6mm Table 3 cm kg/m 3 Fc80 32.0 165 515 731 952 60.0 2.0 Fc100 25.0 160 650 673 913 Fc130 23.0 160 695 877 706 65.0 1.5 Fc150 17.0 160 941 760 612 Fc180 15.0 175 1167 603 487 Fc200 13.0 67.5 2.0 155 1192 417 707 Fc210 11.0 155 1409 258 706 3
4 Table 230mm0.6mm PP 19 PP00.33vol.01.0vol. Fc1807 Fc200Fc210 19 7 4815/h9072h10/h 1020cm 360180 180 105 Fig.2 NN/AcFc0.25 0.33AcFc 2400mm1800mmISO-834 20ISO8341 T345log8t120 1 Tt Fig.1 K1.00mm0.65mm ISO834 23 h/100mm 2 d/dt3h/1000mm/ 3 d/dt hmm1800mm 23 4 @50mm Fig.2
Fig.3Fc150PP00.33vol.Fc200 PP0PP0.33vol.PP0.33vol.0.5vol.Fc150-33 Fig.4 Fig.5 10 30PP PP PP Fc80-00Fc100-00 Fig.4PP30mm Fc130PP70mm Fig.3 Fc180PP PP Fc80Fc150PP Fc130Fc150PP 0.11vol.PP 60 PP0.33vol. 180N/mm 2 Fc180Fc200PP 0.33vol. Fc180-3316mmFc200-33 Fig.3Fc150Fc200 32.7mmPP Fig.4 Fig.5 5
0.51.0vol.PP Fc180Fc2006mm3mmPP 0.171/6 21 Fig.5 Fig.5PP PPFc180Fc200PP 16 70N/mm 2 PP PP4 D s d c 16.2 B70 0.621 V2320.883 f B 4 D s mmd c mm B N/mm 2 B 70 VPPvol.PP0.5vol.0.17 f 1.0 4PP0 B 70N/mm 2 d c 2 PPPPV f PP B Fig.500.17 Fig.54Fig.6PP 4 Fig.74 4 40.908 5mm 5mmPP4 Fig.8Fig.8 180N/mm 2 5mm PP0.4vol. PP PP 12 PP PP 180N/mm 2 PP0.33vol. PP 919 Fig.5PP 1/65mm 6632 Fig.6PP Fig.7 6
22 180N/mm 2 PP PP Fc80150N/mm 2 PP 5mm PPFc100N/mm 2 0.11vol. Fc150N/mm 2 0.33vol.Fc180N/mm 2 PP PP0.33vol. 0.51.0vol. Fig.8 5mm PP Fig.9 Fc150 306090120 175mmC1C5S1 Fig.9Fc150 PPFc150-0010 60600 PP0.33vol.Fc150-33 3600 PP PP Fig.10Fc80Fc15060 PP Fig.10 60 30mm500Fc15060mm500 50 23 Fc150N/mm 2 RC1 PP Fig.11Fc180N/mm 2 PPFc180-00PP0.33vol.Fc180-33PP 1.0vol.Fc180-33-S10C1C5S1PP Fc180-00Fc15010PP 0.33vol.Fc180-3334mm16mm 7030mm 500148PP0.33vol.0.10vol. Fc180-33-S108mm 500150 240 7
Fig.11Fc180 Fig.12 35mm Fc200Fc210 Fig.12Fc200Fc210Fc180PPFc200-00 10PP0.33vol.Fc200-3315 PP6mm 4Fc200N/mm 2 PP Fig.13Fig.16 Fc180 Fig.13Fc80Fc100 Fig.14Fc80Fc100 Fig.15Fc180 Fig.16Fc200Fc210 8
3 Fig.15Fig.16PPFc180 1803 240Fc180Fc200Fc210 2240220240 Fig.17PP Fig.18Fig.19 PP Fc80180 Fc100120Fc130 60PP Fc80Fc100 0.055vol.0.11vol.PPFc130Fc150 0.33vol.PP180 PPFig.1819 10mm20mm Fc150N/mm 2 PP Fc180Fc200PP0.33vol. 148101180 Fc180Fc200N/mm 2 PP PP0.33vol. PP0.5vol. 1.0vol.Fig.1819 6mm180 Fc150N/mm 2 24 25 Fig.17PP Fig.18 Fig.19 80N/mm 2 210N/mm 2 9
RCPP 1 Fc80Fc200N/mm 2 10 60120 2PP150N/mm 2 0.110.33vol.PP 5mm 180PPFc800.055vol.Fc1000.10vol. Fc130Fc1500.33vol. 3 Fc180Fc200N/mm 2 PP0.33120 PP0.251.0vol.6mm 180 Fc80N/mm 2 Fc210N/mm 2 RC PP 1Hermathy, T.Z.: Effect of moisture on the fire endurance of building materials. Moisture in Relation to Fire Tests. ASTM Special Technical Publication, No.385, ASTM, pp.74-95, 1965 2Saito, H: Explosive spalling of prestressed concrete in fire, In Fire Resistance of Prestressed Concrete, Proceedings of a symposium at Braunschwieg, June 1965, Brauersverlag GmbH, Wiesbaden, p.80, 1964 3Vol.16No.2pp.25-301967.1 4U. 1983 52 A1pp.739-7401991.9 611p.51994.11 7 515pp.163-1681999.1 86 RCApp.481-4821992.8 9 14App.331-3381994.9 10 JASS 5 2003 112005.2 12R. Breitenbucker: High Strength Concrete C 105 with Increased Fire-Resistance due to Polypropylene Fibers, Proceedings-Volume 2, pp.b571-577, Utilization of High Strength/High Performance Concrete 29-31 May 1996, Paris, France 13 No.648pp.224-312001.2 14 544pp.171-1782001.6 15 A-2pp.251-2521997 16RC Vol.54No.1pp.17-232004 17Fc150N/mm 2 10
RCA1pp.999-10002003.3 18150N/mm 2 Vol.25No.1pp.995-10002003 19Fc200N/mm 2 1 App.1087-882008.9 20ISO834: Fire-resistance tests -Elements of building construction-, 1997. 21p.982009.3 22Lau, A., Anson, M: Effect of high temperature on high performance steel fibre reinforced concrete, Cement and Concrete Research, No.36, pp.1698-1707, 2006 23 No.557pp.23-282002.7 24 No.58pp.1-102002 25 Vol.59No.1pp.17-232009 11