Concrete used for shaped-steel and concrete joint construction

Abstract

A concrete used for the steel section-concrete structure is prepared from cement, coase aggregate, fine aggregate, water, efficient water reducing agent, wollastonite and powder coal. It has high performance and durability, and low cost.

Description

technical field [0001] The invention relates to a concrete, in particular to a concrete used for a steel-concrete composite structure. Background technique [0002] The steel high-strength high-performance concrete composite structure is the application of new high-tech concrete in the steel-steel concrete (SRC) composite structure. Among them, steel-concrete composite structure (referred to as SRC structure) is a main form of steel-concrete composite structure. Due to its high bearing capacity, high rigidity and good seismic performance, it has been increasingly used in large-span, heavy-duty Tall and supertall buildings in structural and seismic zones. Compared with the steel structure, the SRC structure can save a lot of steel, increase the section rigidity, overcome the disadvantages of the steel structure such as poor fire resistance and durability, and easy buckling and instability, so that the ability of the steel can be fully exerted. Generally, it can save 50% of t...

AI Technical Summary

Problems solved by technology

At present, there are generally two ways to deal with the bond-slip problem between steel and concrete in engineering design: one is to add shear connectors on the surface of the component, which will inevitably cause inconvenience in construction and increase the cost; the other is to Reduce the bearing capacity of components to consider the influence of bond slip, so there must be uneconomical factors

On the other hand, in the design of engineering structures, there is a phenomenon of emphasizing strength and ignoring durability. There have been many problems with the safety and durability of concrete structures during use at home and abroad.

Some concrete structures completely lose their function and bearing capacity due to alkali-aggregate reaction, chloride ion erosion and other reasons when they are used for less than half of the design life. Some projects even collapse partially or overall, causing casualties or damage to building facilities.