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Concrete with strength grade of C70 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, heavy strength but light durability, casualties and building facilities, etc., to achieve high economy, improved bonding performance, and good society benefit effect

Inactive Publication Date: 2008-06-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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Experimental program
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Effect test

Embodiment

[0030] (1) Raw materials:

[0031] 1. Cement

[0032] Choose P.O 52.5R cement with stable quality and performance, and conduct a fluidity test with superplasticizer before use, so as to select cement varieties with good compatibility with superplasticizer. Selected cement performance indicators (including fineness, SO 3 content, MgO content, initial setting time, final setting time, 3-day strength, 28-day strength) must meet the requirements of relevant national standards.

[0033] 2. Aggregate

[0034] The fine aggregate is medium-coarse river sand with smooth particles, hard texture, and good collection and distribution. The quality of the sand should meet the high-quality sand standard specified in 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 upper limit of the sand fineness modulus should be adopted as much as possible), and the mud content is controlled below 1.0%.

[0035] Coa...

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PUM

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Abstract

The invention discloses a concrete with strength grade of C70 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 400:576:1224:148:8:30:120. Component unit is Kg / m3. 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 relatively 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 present invention is a divisional application with the filing date: March 22, 2006, the application number: 200610041959.5, and the title of the invention: "a concrete for steel-concrete composite structures" technical field [0002] The invention relates to a concrete, in particular to a concrete with a strength grade of C70 for a steel-concrete composite structure. Background technique [0003] 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 (SRC structure for short) is a main form of steel-concrete composite structure. 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 buckl...

Claims

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Application Information

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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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