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Abstract

In response to the possible cracking of concrete caused by the pouring age difference between new and old concrete in the main tower of Yangmeizhou Bridge, this paper optimized the concrete mixing ratio by indoor experiments, and studied the effects of different fiber lengths and mixing contents on the dry shrinkage and anti-cracking performance of concrete. Meanwhile, the bonding performance of the new and old concrete interface was tested under different interface treatment methods, with the shrinkage stress of the new and old concrete interface analyzed by employing Midas Civil software. The results show that under the same mixing content of polypropylene fiber, the anti-shrinkage effect of long fiber concrete is better than that of short fiber concrete. Compared with benchmark concrete, the shrinkage rate of concrete with 0.92 kg/m3 polypropylene long fiber added is the smallest, with a reduction of 269 × 10-6 in the shrinkage rate. Adding long fibers can significantly reduce crack width, with the number of fine cracks increasing. The optimal way to treat the combination surface is to chisel the surface of the old concrete and apply an interface agent, and then pour fiber-reinforced concrete, which features higher bonding performance than other treatment methods. The numerical analysis results show that under the optimal treatment scheme, the maximum bonding tensile stress at the interface between new and old concrete decreases from 3.10 MPa to 2.45 MPa, effectively reducing the shrinkage stress at the interface between new and old concrete.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.011

First Page

63

Last Page

68

Submission Date

May 2025

Reference

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