Experimental Study on the Bending Resistance of Hollow Slab Beams Strengthened with Prestressed Steel Strand Polyurethane Cement Composite

Abstract

In order to explore the toughening performance and failure mechanism of hollow slab beams strengthened with prestressed steel strand polyurethane cement composite, three test beams (L1–L3) were strengthened and one test beam (L0) was used as a comparison. The influence of different tensile stresses of steel strand and fiber additions on the flexural bearing capacity of the hollow slab beams, was studied. The cracking characteristics, load deflection relationship, ductility and strain of each test beam were compared and analyzed. The test results showed that the toughened material was well bonded to the hollow slab beam and the steel strand, which effectively inhibited the development of cracks in the test beams. The flexural bearing capacity of the strengthened test beams was significantly improved. The use of prestressed steel strand polyurethane cement composite material effectively improved the flexural bearing capacity of the test beams, and this reinforcement process can be further extended to engineering applications.

Comparison of the Bending Behavior of Cylindrically Shaped Lattice Specimens with Radially and Orthogonally Arranged Cells Made of ABS

“…It shows that the reinforcing porous structure of the filler did not affect the results achieved and did not strengthen the tube, which should not occur from a mechanical point of view. This statement follows the findings of several research results [46][47][48][49], which have already clarified the role of hollow beam reinforcement and demonstrated that the internal structures play a significant role in increasing the strength through the effective use of the strength of the longitudinal fibers and the restraining effect of the fibers oriented at the hoop circumference. Studies have shown that girders with internal structures offer an effective solution for achieving a maximum load-bearing capacity of the structure while minimizing weight.…”

Experimental Study on Flexural Properties of Polyurethane–Cement Composites under Temperature Load

“…It also has good heat and sound insulation, water vapor permeability, and fire resistance [25]. In bridge reinforcement, traditional concrete reinforcement methods have the disadvantages of long construction times, complex maintenance, and severe environmental pollution [26].…”