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

A combination structure and strength grade technology, applied in the field of concrete, can solve the problems of loss of use function and even bearing capacity, reduce the bearing capacity of components, emphasize strength but light durability, etc., achieve high economy, improve construction efficiency, and improve bonding performance effect

Inactive Publication Date: 2012-11-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] (1) Raw materials:

[0035] 1. Cement

[0036] Choose the P.O 52.5R cement with stable quality and performance, and perform a fluidity test with the superplasticizer before use, so as to choose the cement type with good compatibility with the superplasticizer. Selected cement performance indicators (including fineness, SO 3 The content, MgO content, initial setting time, final setting time, 3-day strength, 28-day strength) must meet the requirements of relevant national standards.

[0037] 2. Aggregate

[0038] The fine aggregate adopts medium-coarse river sand with smooth particles, hard texture, and good distribution. The quality of the sand should meet the high-quality sand standard specified in the GB / T14684-93 construction sand standard. Its fineness modulus is between 2.5 and 3.4 (the higher the grade of the prepared concrete, the higher the fineness modulus of sand should be as far as possible), and the mud content is controlled below 1.0%.

[0039] Coarse aggregates are...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/04C04B18/08C04B24/24
CPCY02W30/91
Inventor 郑山锁曾磊车顺利邓国专张亮
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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