Concrete for steel pipe arch and preparation method

Abstract

The invention relates to the technical field of concrete, in particular to concrete for a steel pipe arch and a preparation method, and the concrete comprises the following raw materials in parts by weight: 321 to 413 parts of cement; 55 to 118 parts of fly ash; 33 to 42 parts of an expanding agent; 12 to 30 parts of a viscosity modifying material; 706 to 764 parts of river sand; 1016 to 1100 parts of broken stone; 5.95 to 7.7 parts of a water reducing agent; and 165 parts of underground water. The concrete provided by the invention has good comprehensive properties (including: filling property, flowability, strength, segregation resistance, compactness and contractibility), can effectively ensure that a steel pipe arch is quickly and fully filled with the concrete, and effectively avoidsthe problems of void, segregation and the like.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to concrete for a steel pipe arch and a preparation method thereof. Background technique [0002] In recent years, steel pipe arches have become more and more popular. During the concrete construction stage of steel pipe arches, concrete needs to be filled into steel pipe arches through jacking operations. However, ordinary concrete is difficult to be pumped into the steel pipe arch, so people have developed concrete with special properties. However, after solving the problem that the concrete is difficult to be pumped to the steel pipe arch, the special performance concrete developed still has the following defects: [0003] 1. During the jacking process, the concrete is prone to segregation under ultra-high pressure; [0004] 2. In the process of filling the steel pipe arch, the concrete filling is not sufficient, and gaps will appear; [0005] 3. Concrete solidifies and shrin...

AI Technical Summary

Problems solved by technology

[0003] 1. During the jacking process, the concrete is prone to segregation under ultra-high pressure;

[0004] 2. In the process of filling the steel pipe arch, the concrete filling is not sufficient, and voids will appear;

[0005] 3. Concrete solidifies and shrinks, and the bonding performance with the steel pipe arch is poor, which is prone to void phenomenon

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