Concrete with strength grade of C80 for section steel concrete composite structure

Abstract

The invention discloses a concrete with strength grade of C80 for composite structure of steel reinforced concrete. Mixed proportion of the concrete is that cement: coarse aggregate: fine aggregate: water: effective water reducer: silica fume: fly ash is 450:544:1156:156:12:30:120. Component unit is Kg / m<3>. The concrete is in good mechanical properties (comprising strength, plastic and bond behavior between section steel and concrete), excellent in working performance, good in durability and respectively lower in cost, and is suitable for the composite structure of steel reinforced concrete. The use of the concrete reduces construction procedures, saves steel, improves construction efficiency and has remarkable economic benefit.

Description

[0001] The application date of the present invention is: March 22, 2006, the application number is: 200610041959.5, the title of the invention is: a divisional application for concrete used in steel-concrete composite structures Technical field [0002] The invention relates to a kind of concrete, in particular to a kind of concrete used for a steel-shaped concrete composite structure with a strength grade of C80. Background technique [0003] Steel profile high-strength and high-performance concrete composite structure is the application of new high-tech concrete in steel profile concrete (SRC) composite structure. Among them, the steel-concrete composite structure (SRC structure for short) is a main form of the steel-concrete composite structure. Due to its high bearing capacity, high rigidity and good seismic performance, it has been increasingly used in large-span and heavy-duty structures. Structures and high-rise and super high-rise buildings in seismic zones. Compared with...

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.