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Semi-rigid concrete and preparation process thereof

A concrete and semi-rigid technology, applied in the field of semi-rigid concrete and its preparation, can solve the problems of concrete cracks or fractures, large elastic modulus of concrete, high rigidity, etc., and achieve the effects of reuse, easy storage, and easy processing and production

Active Publication Date: 2014-03-19
THE FOURTH ENG CO LTD OF CHINA RAILWAYNO 20 BUREAU GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another example is the concrete filled in the box girder of a large cable-stayed bridge and its pavement concrete. Due to the large elastic modulus, high rigidity, and strong brittleness of the concrete, it cannot withstand the huge shock wave of the vehicle for a long time, so that the concrete cracks or cracks appear prematurely. fracture

Method used

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  • Semi-rigid concrete and preparation process thereof
  • Semi-rigid concrete and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the prepared semi-rigid concrete is the concrete mixed by replacing part of the fine aggregate of ordinary concrete with a flexible material, and the quality of the replaced fine aggregate is the same as that of the flexible material used for replacement. The prepared semi-rigid concrete is concrete with elastic modulus ε1, where ε0 is the modulus of elasticity of the ordinary concrete.

[0037] In this example, the mass of the replaced fine aggregate is 15% of the total mass of the fine aggregate.

[0038] During actual preparation, the percentage of the mass of the replaced fine aggregate to the total mass of the fine aggregate can be adjusted according to specific needs, and the mass of the replaced fine aggregate is not greater than 60% of the total mass of the fine aggregate.

[0039] In this embodiment, the composition of the flexible material is by mass: 35% rubber powder, 35% rubber particles, 1% polypropylene fiber, 5% fly ash, and 24% m...

Embodiment 2

[0077] In this example, the difference between the prepared semi-rigid concrete and Example 1 is that the quality of the replaced fine aggregate is 30% of the total mass of the fine aggregate.

[0078] In this embodiment, the remaining components and proportions of the prepared semi-rigid concrete are the same as those in Embodiment 1.

[0079] In this example, using figure 1 The preparation process shown is for the preparation of semi-rigid concrete, and the preparation process steps and process parameters adopted are the same as those in Example 1.

[0080] In the present embodiment, after the preparation of the semi-rigid concrete is completed, the slump and bulk density of the prepared concrete and the compressive strength of the constructed concrete structure are tested. The test results are as follows: the slump is 120mm, and the bulk density is 2270Kg / m 3 , the 7-day compressive strength of the formed concrete structure constructed by the semi-rigid concrete is 13.2MP...

Embodiment 3

[0082] In this example, the difference between the prepared semi-rigid concrete and Example 1 is that the quality of the replaced fine aggregate is 45% of the total mass of the fine aggregate.

[0083] In this embodiment, the remaining components and proportions of the prepared semi-rigid concrete are the same as those in Embodiment 1.

[0084] In this example, using figure 1 The preparation process shown is for the preparation of semi-rigid concrete, and the preparation process steps and process parameters adopted are the same as those in Example 1.

[0085] In the present embodiment, after the preparation of the semi-rigid concrete is completed, the slump and bulk density of the prepared concrete and the compressive strength of the constructed concrete structure are tested. The test results are as follows: the slump is 130mm, and the bulk density is 2100Kg / m 3 , the 7-day compressive strength of the formed concrete structure constructed by the semi-rigid concrete is 9.0MPa...

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Abstract

The invention discloses semi-rigid concrete and a preparation process thereof. The semi-rigid concrete is concrete which is prepared through replacing part of fine aggregate of ordinary concrete with a flexible material and then blending, wherein the mass of the replaced fine aggregate is equal to that of the replacing flexible material; the flexible material contains the following ingredients in percentage by mass: 30-40% of rubber powder, 30-40% of rubber grains, 0.5-1.5% of polypropylene fibers, 3-8% of fly ash and 20-28% of mineral admixture; zinc stearate is required to be removed from the surfaces of the rubber grains and the surface of the rubber powder through a strong-base solution. The preparation process comprises the steps: (1) preparing the flexible material and carrying out grading combination in proportion; (2) preparing the semi-rigid concrete. According to the preparation process disclosed by the invention, the steps are simple, the operation is simple and convenient, the invested cost is low, the use effect is good, and the defects in the existing ordinary concrete that the deformation is little, the brittleness is high, the tensile strength is low, and the like can be made up.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, and in particular relates to a semi-rigid concrete and a preparation process thereof. Background technique [0002] With the rise of the modern construction industry, concrete, an engineering material, is widely used in different types of civil engineering construction. Since the biggest feature of concrete materials is high compressive strength and low tensile strength, concrete materials are mainly used for load-bearing structure. However, with the development of engineering technology, concrete, a rigid material with high strength and small deformation, gradually shows its limitations. Nowadays, there is a special desire for a semi-rigid material between rigid materials and flexible materials. , that is, a concrete material appears, which not only has the same strong load-bearing capacity as reinforced concrete (or slightly lower strength requirements), but also has strong tensil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/30C04B18/22
CPCY02W30/91
Inventor 汪君睿李强黄小军仲维玲周玉兵刘金明
Owner THE FOURTH ENG CO LTD OF CHINA RAILWAYNO 20 BUREAU GRP
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