Strain-hardened powder concrete and preparation method thereof, and application of strain-hardened powder concrete in bridge construction

Abstract

The invention provides strain-hardened powder concrete. The strain-hardened powder concrete is composed of the following components: a cement admixture, fine aggregates, an interface strengthening agent, a nanometer reinforcing agent, zinc phosphate modified steel fiber and water. The strain-hardened powder concrete provided by the invention realizes high-efficiency synergy mechanism between a matrix and fiber, realizes tensile strain hardening to deal with the characteristic of large fatigue deformation of a steel bridge deck, and can significantly improve construction performance and serviceperformance under the premise of no changing of the bearing capacity of a combined structure.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a strain hardening active powder concrete, a preparation method thereof and an application thereof in bridge construction. Background technique [0002] Orthotropic steel bridge decks are widely used in long-span steel bridges at home and abroad due to their advantages of light component weight, convenient erection and short construction period. However, the existing pavement layer is easily damaged and the bridge deck is prone to fatigue cracking and failure, which has become an engineering problem for orthotropic steel bridge decks, and the annual maintenance costs are countless. The main reason for this phenomenon is that the pavement material has low tensile strength and poor toughness, which leads to structural cracking and non-ductile damage. main cause of insufficiency. High-strength and high-toughness concrete has the characteristics of high speci...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of insufficient tensile strain and difficult construction of existing pavement materials, the present invention provides a strain-hardening powder concrete, which realizes an efficient synergistic mechanism between matrix and fiber, realizes tensile strain hardening, and copes with large fatigue deformation of steel bridge decks. It can significantly improve the construction performance and service performance without changing the bearing capacity of the composite structure

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