CAJ | 학술논문

研究了钢纤维掺量和强度等级对超高性能纤维增强水泥基复合材料(UHPFRCC)宏观性能的影响及UHPFRCC在荷载与环境因素耦合作用下的耐久性能.制备了3组不同强度等级(100,150,200 MPa)和不同纤维掺量(0％,1％,2％,3％)的高与超高性能水泥基复合材料,并且测试了其各项力学性能和短期耐久性能.利用设计的预加载装置,在UHPFRCC150试件上施加了应力比为0.5的四点弯曲荷载.结果表明,随着强度等级的增加,在掺加适量钢纤维掺量的情况下,高与超高性能水泥基复合材料的强度和韧性均明显提高,同时其干燥收缩值降低.对于加载的试件,钢纤维降低了拉应力对UHPFRCC抗氯离子渗透性能的不利影响,并且提高了材料的抗冻融性能.
연구료강섬유참량화강도등급대초고성능섬유증강수니기복합재료(UHPFRCC)굉관성능적영향급UHPFRCC재하재여배경인소우합작용하적내구성능.제비료3조불동강도등급(100,150,200 MPa)화불동섬유참량(0％,1％,2％,3％)적고여초고성능수니기복합재료,병차측시료기각항역학성능화단기내구성능.이용설계적예가재장치,재UHPFRCC150시건상시가료응력비위0.5적사점만곡하재.결과표명,수착강도등급적증가,재참가괄량강섬유참량적정황하,고여초고성능수니기복합재료적강도화인성균명현제고,동시기간조수축치강저.대우가재적시건,강섬유강저료랍응력대UHPFRCC항록리자삼투성능적불리영향,병차제고료재료적항동융성능.
This study aims to reveal the mechanism that how the content of steel fibers and strength grades affect the macro performance of the ultra-high performance fiber reinforced cementitious composite (UHPFRCC) and to study the UHPFRCC durability under the combined effect of loads and environments.Three types of high and ultra-high performance fiber reinforced cement composites with different strength grades (100,150,200 MPa) and different steel fiber volume fractions (0％,1％,2％,3％) are prepared.The mainproperties of mechanical performance and short-term durability are studied.A preloading frame is designed to apply a fourpoint load external flexural stress with a stress selection ratio of 0.5 for UHPFRCC150 specimens.The results show that the growth in strength grade with a proper content of steel fiber greatly increases the strength and toughness of the HPFRCC and the UHPFRCC while decreasing the dry-shrinkage ratio.For the loaded specimens,the existence of steel fiber can reduce the negative influence of tensile stress on the Cl-penetration resistance of the UHPFRCC in addition to improving its ability to resist the freeze-thaw damage.