Anti-crack concrete for cable-stayed bridge tower column and preparation method of anti-crack concrete

A cable-stayed bridge tower and concrete technology, applied in the field of concrete materials, can solve the problem of low crack resistance of concrete, and achieve the effects of preventing cracking, inhibiting the generation and development, and improving crack resistance.

Inactive Publication Date: 2021-08-24
中铁大桥局第七工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a crack-resistant concrete for the tower column of a cable-stayed bridge and its preparation method to solve the problem of low crack resistance of concrete in the related art

Method used

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  • Anti-crack concrete for cable-stayed bridge tower column and preparation method of anti-crack concrete
  • Anti-crack concrete for cable-stayed bridge tower column and preparation method of anti-crack concrete
  • Anti-crack concrete for cable-stayed bridge tower column and preparation method of anti-crack concrete

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preparation example Construction

[0032] refer to figure 1 , the embodiment of the present application provides a kind of preparation method of anti-cracking concrete for the tower column of cable-stayed bridge, comprising the following steps:

[0033] Step S1, in parts by weight, weigh 420-460 parts of cement, 20-50 parts of fly ash, 0.5-1.5 parts of basalt fiber, 660-680 parts of fine aggregate and 1070-1090 parts of coarse aggregate and mix them evenly , to obtain the first mixture;

[0034] Step S2, weighing 30-40 parts of magnesium oxide expansion agent and 7.0-8.0 parts of polycarboxylate superplasticizer in parts by weight, adding 155-165 parts of water, and mixing uniformly to obtain a second mixture;

[0035] In step S3, the second mixture is added to the first mixture, and stirred to make the mixture uniform, so as to obtain crack-resistant concrete.

Embodiment 1

[0047] Embodiment 1 of the present application provides a kind of preparation method of anti-cracking concrete for tower column of cable-stayed bridge, comprising the following steps:

[0048] Weigh 439kg of cement, 22kg of fly ash, 0.9kg of basalt fiber, 663kg of fine aggregate and 1081kg of coarse aggregate and mix them evenly to obtain the first mixture; weigh 36kg of magnesium oxide expansion agent and 7.46kg of polycarboxylate superplasticizer Add 159kg of water to obtain the second mixture; add the second mixture to the first mixture, stir to make the mixture uniform, and obtain the anti-crack concrete mixture.

[0049] In Example 1, every 1 kg is one portion.

Embodiment 2

[0051] Embodiment 2 of the present application provides a kind of preparation method of anti-cracking concrete for tower column of cable-stayed bridge, comprising the following steps:

[0052] Weigh 421kg of cement, 40kg of fly ash, 0.9kg of basalt fiber, 663kg of fine aggregate and 1081kg of coarse aggregate and mix them evenly to obtain the first mixture; weigh 36kg of magnesium oxide expansion agent and 7.46kg of polycarboxylate superplasticizer Add 159kg of water to obtain the second mixture; add the second mixture to the first mixture, stir to make the mixture uniform, and obtain the anti-crack concrete mixture.

[0053] In Example 2, every 1 kg is one serving.

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Abstract

The invention relates to the technical field of concrete materials, in particular to anti-crack concrete for a cable-stayed bridge tower column and a preparation method of the anti-crack concrete. The anti-crack concrete is prepared from the following components in parts by weight: 420 to 460 parts of cement, 20 to 50 parts of fly ash, 660 to 680 parts of fine aggregate, 1070 to 1090 parts of coarse aggregate, 0.5 to 1.5 parts of basalt fiber, 7.0 to 8.0 parts of polycarboxylate superplasticizer, 155 to 165 parts of water and 30 to 40 parts of magnesium oxide expanding agent. The 7d splitting tensile strength of the prepared anti-crack concrete is larger than or equal to 3.2 MPa, the 28d splitting tensile strength of the anti-crack concrete is larger than or equal to 3.8 MPa, and the anti-crack grade reaches the L-III grade.

Description

technical field [0001] The present application relates to the technical field of concrete materials, in particular to a crack-resistant concrete for a cable-stayed bridge tower column and a preparation method thereof. Background technique [0002] Cable-stayed bridge, also known as cable-stayed bridge, is a bridge in which the main girder is directly pulled on the bridge tower by many cables. structural system. Cable-stayed bridges are mainly composed of cable towers, main girders, and cable-stayed cables. Cable-stayed bridges are important stress-bearing components in cable-stayed bridges. Through the investigation of the long-span concrete bridges that have been built, it is found that the concrete towers are prone to cracking, which not only affects the service life of the bridge, but also buryes serious safety hazards. [0003] Cable tower cracks generally occur in the early stage of construction. When designing the mix ratio, the construction party often regards stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2201/50C04B2111/343
Inventor 藕长洪董志成王玮陈开桥程忠赫卫志刘旭汤长远杜操吴冬冬刘明勇纪宪坤郭焕徐可
Owner 中铁大桥局第七工程有限公司
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