HRB400钢筋与钢纤维再生混凝土黏结性能及影响因素分析

设计了28组拉拔试件,研究了不同钢纤维体积掺量、再生骨料取代率、钢筋直径和锚固长度对HRB400钢筋与钢纤维再生混凝土黏结滑移性能的影响。结果表明,随着再生骨料取代率的增加,试件的黏结强度下降;与再生骨料取代率为0相比,当再生骨料取代率为100%时,试件的黏结强度下降幅度最大;随着钢纤维掺量的增加,试件的黏结强度整体呈上升趋势,极限荷载下钢筋自由端的滑移值也相应增加;钢筋直径增大时,其黏结强度有所降低;有效锚固长度增大时,黏结强度出现了不同程度的下降,且有效锚固长度为5d时的极限黏结强度最大。

Analysis of Bond Performance and Influencing Factors between HRB400 Steel and Steel Fiber Recycled Concrete

28 groups of pull out test specimens were designed to study the influence of different steel fiber volume content, recycled aggregate replacement rate, steel bar diameter and anchorage length on the bond slip performance of HRB400 rebar and steel fiber recycled concrete. The results show that the bond strength of specimen decreases with the increase of the replacement rate of recycled aggregate. Compared with the recycled aggregate replacement rate of 0, the bond strength of the specimen decreases the most when the recycled aggregate replacement rate is 100%. With the increase of steel fiber content, the bond strength of the specimen shows an overall upward trend, and the slip value of the free end of the reinforcement increases correspondingly under the ultimate load. When the diameter of reinforcement increases, its bond strength decreases. When the effective anchorage length increases, the bond strength decreases to different degrees, and the ultimate bond strength is the largest when the effective anchorage length is 5 d.