Research on flexural performance of composited RC beams with different forms of TRC permanent formwork

In order to avoid the shortcomings of the traditional building template, such as the cumbersome process of supporting and disassembling the mold, the low turnover, and the occupation of a lot of labor, it is proposed to replace the traditional building formwork with the textile reinforced concrete (TRC) as a permanent formwork. In this paper, the template form is used as the research parameter, and the bending performance of the U-shaped and single-plate TRC template composite beam and the comparative beam under static load is compared and studied. The test results found that during the loading process, the single-plate formwork composite beam was peeled off from the TRC formwork, and the U-shaped formwork and the post-cast concrete interface bonded well. Under the premise that the interface between the formwork and the post-cast concrete is good, the cracking load, yield load and ultimate load of the TRC formwork composite beam are improved compared with the ordinary reinforced concrete beam; the crack width of the composite beam is smaller and the development is slow; Bending rigidity becomes greater but ductility is reduced to a certain extent. Overall, the bending performance of the U-shaped formwork composite beam is better than that of the single-plate formwork composite beam. In addition, on the basis of the test, this paper puts forward the formula of the normal section bending capacity of the U-shaped TRC template laminated RC beam, and the test results are in good agreement with the theoretical calculations.

Automated summary

This study compared and studied the bending performance of U-shaped and single-plate TRC template composite beams in construction using TRC as a permanent formwork, finding that the U-shaped formwork composite beam had better bending performance than the single-plate formwork composite beam. The TRC formwork composite beams showed improvements in cracking load, yield load, and ultimate load compared to ordinary reinforced concrete beams, with smaller crack widths and slower development, although with reduced ductility. Overall, the TRC formwork composite beams exhibited better load-bearing capacity and durability.