High-strength reinforced and functionally-graded concrete beam

A technology of high-strength steel bars and concrete beams, applied in the directions of joists, girders, trusses, etc., can solve the problems of small ultimate elongation and poor crack resistance of ordinary concrete, and achieve the reduction of dosage, high durability and strong bearing capacity. Effect

Inactive Publication Date: 2015-04-29
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the crack width control problem encountered in the popularization of high-strength steel bars, and the shortcomings of ordinary concrete such as poor crack resistance and low limit elongation, the invention provides a functionally gradient concrete beam with high-strength steel bars, aiming to solve how to configure high-strength steel beams. Reinforced concrete beams take full advantage of the strength of high-strength steel bars and at the same time control the crack width in the limit state of normal use to meet the durability requirements

Method used

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  • High-strength reinforced and functionally-graded concrete beam
  • High-strength reinforced and functionally-graded concrete beam
  • High-strength reinforced and functionally-graded concrete beam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1, the formula of each component of the high-toughness fiber reinforced cement-based composite material is: cement (P.O.42.5): silica fume: water: quartz sand (100-200 mesh): water reducing agent=0.8:0.2:0.4:0.36: 0.004, wherein the fiber is domestic polyvinyl alcohol fiber or polypropylene fiber, and the volume content is 2.0%.

[0029] Preparation method of high-toughness fiber reinforced cement-based composite material: Mix cement, fly ash, silica fume, and quartz sand with a mixer at low speed for 1 minute; add water and water reducing agent, first stir at low speed for 1 minute, and then stir at high speed for 2 minutes to improve the fluidity of concrete ; Finally, add domestic fiber and stir at high speed for 8 minutes until the fiber is evenly dispersed.

[0030] For a high-strength reinforced functionally graded concrete beam cast on site, the specific implementation steps are as follows:

[0031] (1) Bundle high-strength steel bars and othe...

Embodiment 2

[0037] Example 2, the preparation method of the high-toughness fiber reinforced cement-based composite material is the same as Example 1.

[0038] For a high-strength reinforced functionally graded concrete beam cast on site, the specific implementation steps are as follows:

[0039] (1) Binding and placement of steel bars are the same as Example 1;

[0040] (2) Cast a specific beam section with high toughness fiber reinforced cement-based composite material, its thickness is 1 / 10~1 / 5 of the height of the beam section, its length is 1 / 4~1 / 2 of the beam length, and the width of the beam section is the same as The beam is the same. And the beam segment is symmetrical to the moment control section of the beam. When pouring, pre-embed connecting steel bars or steel wires or steel mesh on both sides and the upper surface of the beam section;

[0041] (3) Pouring ordinary concrete, vibrating molding and curing are the same as in Example 1.

[0042] For a pre...

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Abstract

The invention relates to a structure of a building member and a material, particularly relates to a high-strength reinforced and functionally-graded concrete beam and belongs to the technical field of building materials. The high-strength reinforced and functionally-graded concrete beam is mainly characterized in that common concrete and a high-toughness fiber-enhanced cement-based composite material are combined in a layering manner; the common concrete is adopted for the pressed area of the concrete beam; the high-toughness fiber-enhanced cement-based composite material is cast in a pulled area in the whole longitudinal-length range of the beam or the specific beam section; and interface-area treatment is adopted for a combined area of the common concrete and the high-toughness fiber-enhanced cement-based composite material. The high-strength reinforced and functionally-graded concrete beam has the advantages that uniform transition of the material system on performance is realized, discontinuous weak areas on the interface are eliminated, the bearing capability of the structure is effectively improved and the completeness and the stability of the whole structure are ensured.

Description

technical field [0001] The invention relates to a structure and material of a building component, in particular to a high-strength reinforced functional gradient concrete beam, which belongs to the technical field of building materials. Background technique [0002] The durability of concrete structures is a major worldwide engineering technical issue in the field of civil engineering today. It is universal and scientific, and is closely related to the national economy and sustainable development. According to statistics, in 1999 alone, my country's economic losses due to structural deterioration were as high as 180 billion to 360 billion yuan. The performance deterioration of reinforced concrete structures is caused by the deterioration of concrete and the deterioration of steel bars, both of which are related to the cracking of concrete. A large number of studies have shown that the corrosion rate of steel bars is related to the rate at which moisture and other ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C3/20C04B28/00C04B16/06
Inventor 李志华胡超陈伟康
Owner YANGZHOU UNIV
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