CAJ | 학술논문

研究了不同种类纤维、不同温度和不同保温时间下，混凝土试件高温作用后的质量损失率、相对动弹性模量，进行了抗压强度和劈裂抗拉强度试验，测试其残余强度，讨论了温度、保温时间和纤维种类对其高温后基本物理力学性能的影响，并分析了有机纤维改善混凝土高温后性能的机理。研究表明，高温作用后，基准混凝土性能下降较快，且温度达到700~800℃时，发生爆裂；掺入两种有机纤维都能有效降低混凝土高温作用下的爆裂。掺入有机纤维可以减少高温作用下混凝土的水分蒸发量，降低混凝土的质量损失。高温作用下，混凝土试件的劈裂抗拉强度比抗压强度下降更快。随着保温时间的延长，混凝土的强度损失明显增大。不同纤维均可以降低混凝土高温作用下的强度损失，缓解高温作用下混凝土内应力可能引起的破坏，降低爆裂的可能性。
연구료불동충류섬유、불동온도화불동보온시간하，혼응토시건고온작용후적질량손실솔、상대동탄성모량，진행료항압강도화벽렬항랍강도시험，측시기잔여강도，토론료온도、보온시간화섬유충류대기고온후기본물리역학성능적영향，병분석료유궤섬유개선혼응토고온후성능적궤리。연구표명，고온작용후，기준혼응토성능하강교쾌，차온도체도700~800℃시，발생폭렬；참입량충유궤섬유도능유효강저혼응토고온작용하적폭렬。참입유궤섬유가이감소고온작용하혼응토적수분증발량，강저혼응토적질량손실。고온작용하，혼응토시건적벽렬항랍강도비항압강도하강경쾌。수착보온시간적연장，혼응토적강도손실명현증대。불동섬유균가이강저혼응토고온작용하적강도손실，완해고온작용하혼응토내응력가능인기적파배，강저폭렬적가능성。
The mass loss rate and the relative dynamic elastic modulus of concrete specimens were studied under varying fiber types,temperature and holding time in this work. Studied compressive strength and splitting tensile strength of series of samples which treated under different conditions. Influences of high temperature, holding time and fiber types for the primary physical and mechanical properties of concrete were discussed respectively. The improvement mechanism of organic fiber on the performance of concrete after high temperature was also investigated. The results revealed that, the mechanical performance of plain concrete was declined heavily after high temperature, even burst after temperature ar-rived 700℃to 800℃. Two types of organic fiber addition would significantly reduce the risk of this burst behavior. Mix-ing organic fiber can reduce the water evaporation and the mass loss of concrete after high temperature. After high temper-ature treatment, splitting tensile strength of the specimens decreased quicker than the compressive strength. The decrease of strength was obviously enlarged with the increasing of heat holding time. The strength loss after heating would eased by organic fiber, for the in-situ pore structure formed after fiber melted would release a part of stress caused by heating, and prevent the microstructure destruction and explosion of concrete.