CAJ | 학술논문

采用SEM和XRD微观试验方法研究HCSA膨胀剂成份，利用分离式SHPB试验技术，对不同膨胀剂掺量下3d和7d龄期钢纤维混凝土进行动态单轴压缩性能试验。膨胀剂掺量为8％时，补偿收缩钢纤维混凝土峰值动态抗压强度最高；3d龄期混凝土应力应变曲线有明显的分段性，主要分为弹性压缩阶段、弹塑性压缩阶段和塑性破坏阶段；7d龄期混凝土应力应变曲线中峰值应力凸显；随着冲击气压的增大，试件破坏的离散性增强，但掺入钢纤维后，利用其空间约束效应，使得混凝土破碎块度的尺寸较大。
채용SEM화XRD미관시험방법연구HCSA팽창제성빈，이용분리식SHPB시험기술，대불동팽창제참량하3d화7d령기강섬유혼응토진행동태단축압축성능시험。팽창제참량위8％시，보상수축강섬유혼응토봉치동태항압강도최고；3d령기혼응토응력응변곡선유명현적분단성，주요분위탄성압축계단、탄소성압축계단화소성파배계단；7d령기혼응토응력응변곡선중봉치응력철현；수착충격기압적증대，시건파배적리산성증강，단참입강섬유후，이용기공간약속효응，사득혼응토파쇄괴도적척촌교대。
The microscopic testing method of SEM and XRD was used to study the composition of HCSA expansive agent and the compatibility between the expansive agent and ordinary Portland cement hydration reaction ,in order to prepare shrinkage compensation steel fiber reinforced concrete (SCSFRC ) .Uniaxial compression test was conducted on the steel fiber reinforced concrete specimens of 3 d and 7 d with different dosage of expansive agent by using separate SHPB tech-niques .The dosage of expansive agent has certain effects on the dynamic compressive strength of SCSFRC ,which peaks when the expansive agent content reaches 8% .Stress-strain curves of the three kinds of specimens are unanimous .The curve of the 3 d specimen is sectional ,namely the elastic compression stage ,elastic-plastic compression stage and plastic failure stage;whereas the curve of the 7 d specimen presents a more obvious peak stress .With the increment of the im-pact pressure ,the specimen failure becomes more dispersive ,while after the addition of steel fiber ,the broken pieces of the specimen becomes bigger due to the space restraint effect of the steel fiber .