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AbstractThe study on precast UHPC-NC composite beams investigated the effects of shear span ratio, stirrup reinforcement ratio, and NC strength on cracking shear force and diagonal crack width. Tests on eight UHPC-NC beams and one RC beam revealed that increasing the shear span ratio reduced the cracking shear force and widened diagonal cracks. U-shaped UHPC formwork enhanced cracking shear force and delayed crack development. While stirrup ratio had minimal impact on cracking force, it helped delay crack growth. A proposed model accurately estimated cracking shear force and maximum diagonal crack width, offering valuable insights for engineering applications. [ABSTRACT FROM AUTHOR]

To study the bond–slip behavior between reinforcing bars and reactive powder concrete (RPC), eccentric pull‐out tests of 20 groups of bonding specimens were conducted, and the variables in the test specimens included RPC strength, cover thickness, bond length, and reinforcing bar diameter. The effects of various parameters on the bond stress and peak slip were analyzed. A formula for calculating the average bond stress and between the reinforcing bar and RPC were established, and the bond–slip relationship between reinforcing bar and RPC was determined. The results indicated that the bond length had the most significant effect on the bond performance, followed by the strength of concrete, cover thickness, and reinforcing bar diameter. When the bond length increased from 3d to 4d, the average bond stress decreases by 13.2% to 23.7%. When reinforcing bar diameter increased from 16 to 20 and 25 mm, the average bond stress increased by 6.58% and 15.9%, respectively. The average bond stress increased with increase of the cover thickness. When the RPC strength increased from 105.2 to 124.8 MPa, the average bond stress increased by 7.0% to 13.2%. [ABSTRACT FROM AUTHOR]