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Abstract

Ordinary bridge concrete has low flexural tensile strength, great brittleness, and poor toughness. Under the action of driving load, the bridge structure is prone to cracking and fails to meet the requirements of modern traffic for bridge engineering. Therefore, it is urgent to improve the cracking resistance of bridge concrete. As a water-soluble polymer, water-based epoxy resin not only has the characteristics of traditional epoxy resin, such as strong bonding force, water resistance, acid and alkali corrosion resistance, erosion resistance, and good impermeability but also does not contain organic solvents and other pollutants. Its application in bridge concrete can effectively improve the flexural tensile strength and flexural toughness of concrete, thus solving the problem of cracking of bridge concrete and increasing the service life of bridge structures. In this paper, the flexural tensile strength and three-point bending test of water-based epoxy resin-modified concrete were designed, and the toughening effect was evaluated by strength (flexural tensile strength and bending toughness coefficient), deformation (deflection), and energy (fracture energy), and the cracking resistance effect was verified by plate-induced cracking test. Finally, the toughening and cracking resistance mechanism of water-based epoxy resin-modified concrete was elucidated through microscopic analysis. The test results show that the addition of water-based epoxy resin can effectively improve the flexural tensile strength, bending toughness, and fracture energy of concrete. Compared with that of ordinary cement concrete, the 7-day flexural tensile strength of water-based epoxy resin-modified concrete can be increased by 20.4%, and the bending toughness and fracture energy can be increased by up to 42.7% and 51.8%, respectively. Water-based epoxy resin can improve the cracking resistance of bridge concrete by improving pore structure, microfiber, and water retention.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.015

First Page

87

Last Page

93

Submission Date

May 2025

Reference

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