CAJ | 학술논문

通过对承载喷射混凝土进行快速碳化试验，分析了施工方式、钢纤维、应力水平对混凝土碳化深度的影响规律，同时对其碳化后的力学性能进行了探讨。试验结果表明，承载喷射混凝土的碳化深度与碳化时间的平方根成正比；其抗碳化能力优于同条件下的浇筑混凝土，但是劣于喷射钢纤维混凝土；弯拉应力水平越高，混凝土碳化深度也越大；建立了应力加速因子与应力水平的关系。碳化使喷射混凝土的抗折强度降低，但掺入钢纤维后，其抗折强度相对有所改善。
통과대승재분사혼응토진행쾌속탄화시험，분석료시공방식、강섬유、응력수평대혼응토탄화심도적영향규률，동시대기탄화후적역학성능진행료탐토。시험결과표명，승재분사혼응토적탄화심도여탄화시간적평방근성정비；기항탄화능력우우동조건하적요축혼응토，단시렬우분사강섬유혼응토；만랍응력수평월고，혼응토탄화심도야월대；건립료응력가속인자여응력수평적관계。탄화사분사혼응토적항절강도강저，단참입강섬유후，기항절강도상대유소개선。
After accelerated carbonation experiment of shotcrete under bending loads,the influence of construction mode,steel fiber content as well as stress level on carbonation depth was analyzed ,and the mechanical properties of carbonized shotcrete was discussed.The test results show that the carbonation depth of shotcrete under bending loads is proportional to the square root of carbonation time ,and the car bonation resistance of sprayed concrete is better than ordinary concrete under the same conditions ,but inferior to steel fiber rein-forced shotcrete.The higher flexural tensile stress level is,the higher the depth of carbonation can be observed.The relationship between stress acceleration factor and the stress level is established.Carbonation can reduce the bending strength of shotcrete ,however,with the in-corporation of steel fibers,the flexural strength can be improved.