Bridge joint ultrahigh crack-resistance concrete and preparation method thereof

A crack-resistant and concrete technology, which is applied in the field of ultra-high crack-resistant concrete for bridge joints and its preparation, can solve the problems of large viscosity coefficient of concrete, difficult to form self-compacting, and large amount of concrete cementitious materials, etc. The effect of crack resistance and durability

Inactive Publication Date: 2018-05-29
JIANGXI PROVINCIAL EXPRESSWAY INVESTMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its raw material cost is high, the proportion of silica fume is high, the viscosity coefficient of concrete is large, the use of concrete cementitious materials is large, the heat of hydration is high, and it is not easy to form self-compacting, which limits the wide application of ultra-high performance concrete in the construction industry. use and development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A bridge joint ultra-high crack resistance concrete, comprising in parts by weight: 40 parts of cement, 4 parts of silica fume, 13 parts of diatomite, 18 parts of slag powder, 12 parts of red sandstone powder, polycarboxylate water reducing 3 parts of agent, 6 parts of steel fiber, 12 parts of polyacrylonitrile fiber, 12 parts of water. Among them, the steel fiber has a diameter of 0.18 mm and a length of 12 mm, and the polyacrylonitrile fiber has a diameter of 19 μm and a length of 8 mm.

[0018] The preparation method of the above bridge joint ultra-high crack resistance concrete includes the following steps.

[0019] (1) Mix cement, slag powder and red sandstone powder and stir evenly to obtain a cement mixture.

[0020] (2) Mix silica fume, diatomaceous earth, steel fiber and polyacrylonitrile fiber and stir well.

[0021] (3) Dissolve polycarboxylate superplasticizer in water.

[0022] (4) Add 1 / 2 of the total volume of the polycarboxylate superplasticizer aqueo...

Embodiment 2

[0027] A bridge joint ultra-high crack resistance concrete, comprising in parts by weight: 70 parts of cement, 9 parts of silica fume, 25 parts of diatomaceous earth, 30 parts of slag powder, 18 parts of red sandstone powder, polycarboxylate water reducing 7 parts of agent, 13 parts of steel fiber, 19 parts of polyacrylonitrile fiber, 20 parts of water. Wherein, the steel fiber has a diameter of 0.21 mm and a length of 13 mm, and the polyacrylonitrile fiber has a diameter of 21 μm and a length of 16 mm.

[0028] The preparation method of the above bridge joint ultra-high crack resistance concrete includes the following steps.

[0029] (1) Mix cement, slag powder and red sandstone powder and stir evenly to obtain a cement mixture.

[0030] (2) Mix silica fume, diatomaceous earth, steel fiber and polyacrylonitrile fiber and stir evenly to obtain a silica fume mixture.

[0031] (3) Dissolve polycarboxylate superplasticizer in water.

[0032] (4) Add 1 / 2 of the total volume of ...

Embodiment 3

[0037] A bridge joint ultra-high crack resistance concrete, comprising in parts by weight: 55 parts of cement, 6 parts of silica fume, 20 parts of diatomite, 25 parts of slag powder, 15 parts of red sandstone powder, polycarboxylate water-reducing 4 parts of agent, 10 parts of steel fiber, 14 parts of polyacrylonitrile fiber, 15 parts of water. Among them, the steel fiber has a diameter of 0.23 mm and a length of 14 mm, the polyacrylonitrile fiber has a diameter of 22 μm and a length of 20 mm, and the particle size of the red sandstone powder is 19 μm.

[0038] The preparation method of the above bridge joint ultra-high crack resistance concrete includes the following steps.

[0039] (1) Mix cement, slag powder and red sandstone powder and stir evenly to obtain a cement mixture.

[0040] (2) Mix silica fume, diatomaceous earth, steel fiber and polyacrylonitrile fiber and stir evenly to obtain a silica fume mixture.

[0041] (3) Dissolve polycarboxylate superplasticizer in wa...

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Abstract

The invention relates to bridge joint ultrahigh crack-resistance concrete and a preparation method thereof. The concrete is prepared from cement, silica fume, diatomite, slag powder, red sandstone powder, polycarboxylate water reducing agent, steel fibers, polyacrylonitrile fibers and water. The preparation method comprises the following steps: uniformly mixing and stirring the cement, the slag powder and the red sandstone powder, and obtaining a cement mixture; then mixing the silica fume, the diatomite, the steel fibers and the polyacrylonitrile fibers, uniformly stirring, and obtaining a silica fume mixture; dissolving the polycarboxylate water reducing agent in water, and obtaining an additive aqueous solution; adding half of the additive aqueous solution into the cement mixture, and uniformly stirring; adding the remaining additive aqueous solution into the silica fume mixture, and uniformly stirring; and finally uniformly stirring the obtained mixture. The concrete of the invention has excellent crack resistance and durability, the flexural crack resisting strength is greater than 40MPa, the breaking strength is greater than 10J / m<2>, the chlorine ion permeation resistance can reach grade RCM-V, and the pressure resisting strength is not less than 150MPa.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete with super high crack resistance for bridge joints and a preparation method thereof. Background technique [0002] Since the concept of ultra-high performance concrete was first proposed by Larrard et al. in 1994, ultra-high performance concrete has shown very superior performance, such as compressive strength reaching more than 150MPa, which is much higher than that of ordinary concrete, and has excellent fracture toughness, fracture energy and Anti-chloride ion permeability, strong anti-carbonation and sulfate penetrant ability, there are a large number of unhydrated cement particles, so that the concrete has a self-repairing function, light weight, reduces the weight of the structure, saves costs, and reduces the cost. [0003] The good mechanical and physical properties of ultra-high performance concrete materials make it popularized as the m...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B111/34
CPCC04B28/00C04B2111/343C04B2201/50C04B14/08C04B18/141C04B14/02C04B24/24C04B14/48C04B16/0658
Inventor 冷健华郭庆坪叶浪余秋生张海明戴晖黄旋张杨王凯任亮
Owner JIANGXI PROVINCIAL EXPRESSWAY INVESTMENT GRP CO LTD
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