Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column

Abstract

The invention discloses a preparation method of an expansion rate-controllable steel pipe and steel-slag concrete column, and belongs to the technical field of civil engineering. The method is that steel-slag sand is used for replacing all fine aggregates, and ordinary portland cement, steel-slag sand, gravels and water are utilized to prepare the expansion rate-controllable steel pipe and steel-slag concrete column. The method specifically comprises the preparation steps of selecting a steel pipe and steel-slag concrete at a certain strength grade according to the requirement of the bearing capacity of the steel pipe and steel-slag concrete column; determining self stress of the steel pipe; calculating to determine the free expansion rate of the slag-steel concrete; calculating to determine the average particle size of the steel-slag stand; selecting the steel-slag sand with reasonable graduation; calculating to determine the quantity of the used portland cement, the steel-slag sand, the gravels and the water according to a design method of a mixing ratio of ordinary concrete; and preparing the steel pipe and steel-slag concrete column, pouring the steel pipe and steel-slag concrete column and maintaining the steel pipe and steel-slag concrete column. With the adoption of the prepared steel pipe and steel-slag concrete column, the core concrete can early be in a three-directional pressing state, and therefore, the bearing capacity and ductility of the steel pipe concrete can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a method for preparing a steel pipe steel slag concrete column with a controllable expansion rate. The combined column is suitable for column structures in civil buildings, industrial workshops and bridge structures. Background technique [0002] Concrete-filled steel tube columns have the advantages of high bearing capacity, good seismic performance, and convenient construction, and are widely used in the field of civil engineering. However, in CFST columns, due to the volume shrinkage of the core concrete during the setting and hardening process, the bonding force between the steel tubes and the core concrete will decrease, which will seriously affect the mechanical properties of the CFST columns. [0003] At present, there are two commonly used solutions: one is to add an expansion agent to the core concrete. The addition of the expansion agent is only be...

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Problems solved by technology

The second is to add admixtures and admixtures to ensure later expansion in the core concrete. On the one hand, the admixture of admixtures increases the construction cost and difficulty; on the other hand, the addition of admixtures makes the concrete harden and water The transformation process is more complicated, and it is difficult to achieve the best expected results

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