High-strength self-compacting concrete suitable for steel-concrete combined section and preparation method of high-strength self-compacting concrete

Abstract

The invention discloses high-strength self-compacting concrete suitable for a steel-concrete combined section and a preparation method of the high-strength self-compacting concrete. The high-strength self-compacting concrete comprises the following components in parts by weight: 200-250 parts of water, 850-855 parts of cement, 230-260 parts of silica fume, 120-145 parts of fly ash, 1000-1100 parts of sand, 6-10 parts of a water reducing agent, 55-65 parts of an expanding agent and 100-130 parts of steel fibers. The high-strength self-compacting concrete is reasonable and scientific in formula, the high-strength self-compacting concrete is prepared through specific components and dosage, the high-strength self-compacting concrete has high strength and high bending resistance, good fluidity and self-compacting performance in the construction process can be guaranteed, and meanwhile the design requirements for durability and the like of a combined section are met.

Description

technical field [0001] The invention belongs to the technical field of concrete, and particularly relates to a high-strength self-compacting concrete suitable for a steel-concrete joint section and a preparation method thereof. Background technique [0002] The steel-concrete combined section is one of the key technologies in the design and construction of hybrid bridges. The main function of this part is to ensure the uniformity of the stiffness transition between the steel beam and the concrete beam and the smoothness of the force transmission, avoid stress concentration and corner bending, and ensure The durability of the bridge. In the application of real bridges at home and abroad, some concrete cracks in the steel-concrete joint section have occurred. In order to ensure the rigidity transition and safety durability in the structure of the steel-concrete joint section, in addition to selecting an appropriate connection scheme in the structural design, the material The ...

AI Technical Summary

Problems solved by technology

[0003] Since steel girders are mostly closed box structures, the pouring space is narrow, and there are generally many connectors such as perforated plate shear studs in steel box girders, and the existing design generally uses prestressed The connection of steel beams and concrete beams will inevitably lead to difficulties in concrete pouring and vibration, and it is easy to cause voids between concrete and steel structures; at the same time, the grade of concrete commonly used is relatively high. It is generally difficult to maintain health, and it is easy to produce strong shrinkage and creep, which leads to the lack of close adhesion between concrete and steel structures.

If the quality of concrete pouring is poor, it will easily lead to defects such as voids in the concrete, which is not conducive to the bearing and durability of the structure, and will have a certain impact on the smooth construction and safe operation of the bridge.

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