Concrete for dams and preparation method thereof

A technology for concrete and dam, applied in the field of concrete for dam and its preparation, can solve the problems of alkali content regulation, reduce engineering life, affect concrete durability, etc. The effect of alkali-aggregate reaction

Active Publication Date: 2014-11-12
CHINA YANGTZE POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crack control of mass concrete has always been a technical problem, which seriously affects the quality of the project and greatly reduces the life of the project. How to control the cracks of mass concrete is a problem often encountered in engineering construction
The problem of concrete aggregate reaction has gradually attracted attention. Once the reaction occurs, the concrete will expand and crack.
CN200810084398.6 discloses a preparation method of durable concrete, but does not clearly specify the types and proportions of the raw materials in the concrete. The durable concrete it refers to is mainly used in construction, transportation and other fields. Compared with dams, The requirements for concrete are relatively low, and there is no clear regulation on the alkali content in raw materials

Method used

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  • Concrete for dams and preparation method thereof
  • Concrete for dams and preparation method thereof
  • Concrete for dams and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The implementation of the dam concrete, the proportioning of each raw material in the concrete per cubic meter is as follows:

[0031] Sand: 700kg, gravel: 1000kg, water: 90kg, cement: 300kg, fly ash: 100kg, water reducer: 6.0kg, air-entraining agent: 65kg, magnesium chloride solution: 50kg, additive: 3kg, compound rare earth: 30g.

[0032] The mass percentages of the composite rare earth components are: lanthanum: 12%, cerium: 18%, scandium: 19%, yttrium: 9%, samarium: 7%, neodymium: 11%, gadolinium: 7%, praseodymium: 1%, dysprosium : 16%.

[0033] The weight percent components of the additives are: high aluminum powder: 34%, sodium sulfate aqueous solution: 29%, sodium silicate: 37%.

[0034] The sand is medium sand with a fineness modulus Mf3 - The concentration is greater than 250mg / L; the cement is medium-heat Portland cement, the strength grade is not less than 52.5, and the weight content of MgO is 3.0%. It has the characteristics of low alkali con...

Embodiment 2

[0044] Example 2: Concrete for the dam of this embodiment, the proportioning of each raw material in the concrete per cubic meter is as follows: sand: 720kg, crushed stone: 1030kg, water: 100kg, cement: 320kg, fly ash: 110kg, water reducer: 6.3kg, Air-entraining agent: 85kg, magnesium chloride solution: 60kg, additive: 4kg, compound rare earth: 40g.

[0045] The mass percentages of the composite rare earth components are: lanthanum: 15%, cerium: 15%, scandium: 16%, yttrium: 11%, samarium: 8%, neodymium: 13%, gadolinium: 8%, praseodymium: 2%, dysprosium : 12%. The weight percent components of the additives are: high aluminum powder: 37%, sodium sulfate aqueous solution: 27%, sodium silicate: 36%.

[0046] The sand is fine sand with a fineness modulus Mf3 - The concentration is greater than 250mg / L; the cement is medium-heat Portland cement, the strength grade is not less than 52.5, and the weight content of MgO is 3.2%; the fly ash is Class I fly ash, the fineness is less t...

Embodiment 3

[0056] Example 3: Concrete for the dam of this embodiment, the proportioning of each raw material in the concrete per cubic meter is as follows: sand: 750kg, crushed stone: 1050kg, water: 110kg, cement: 350kg, fly ash: 120kg, water reducer: 6.5kg, Air-entraining agent: 95kg, magnesium chloride solution: 70kg, additive: 5kg, compound rare earth: 50g.

[0057] The mass percentages of the composite rare earth components are: lanthanum: 13%, cerium: 16%, scandium: 17%, yttrium: 10%, samarium: 9%, neodymium: 12%, gadolinium: 9%, praseodymium: 3%, dysprosium : 11%.

[0058] The weight percent components of the additives are: high aluminum powder: 34%, sodium sulfate aqueous solution: 27%, sodium silicate: 39%.

[0059] The sand is medium sand with a fineness modulus Mf3 - The concentration is greater than 250mg / L; the cement is medium-heat Portland cement, the strength grade is not less than 52.5, and the weight content of MgO is 3.0%-3.5%; the fly ash is Class I fly ash, the fi...

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Abstract

The invention discloses a concrete for dams. Every cubic meter of concrete comprises the following raw materials: 700-750kg of sand, 1000-1050kg of gravel, 90-110kg of water, 300-350kg of cement, 100-120kg of fly ash, 6.0-6.5kg of water reducing agent, 65-95kg of air entraining agent, 50-70kg of magnesium chloride solution, 3-5kg of additive and 30-50g of composite rare earth. The invention also discloses a preparation method of the concrete. By adding proper admixtures on the premise of not obviously increasing the cement content, the invention obviously enhances the primary indexes of the concrete, greatly lowers the initial hydration heat of cement, avoids temperature cracking, can be widely used for dam concreting or other mass concreting under different climatic conditions, and has important meanings for enhancing the engineering quality and ensuring the long-term safety of engineering.

Description

technical field [0001] The invention relates to a concrete and a preparation method thereof, in particular to a dam concrete and a preparation method thereof. Background technique [0002] The safe operation of large-scale water conservancy and hydropower projects is directly related to the life and property safety of the upstream and downstream people, and the quality of concrete is an important basic condition to ensure the safety of the project. The total amount of concrete poured for dam buildings is huge, and the concrete must be of high quality, Features such as high durability. Crack control of mass concrete has always been a technical problem, which seriously affects the quality of the project and greatly reduces the life of the project. How to control the cracks of mass concrete is a problem often encountered in engineering construction. The heat of hydration produced by cement is an important cause of temperature cracks, so it is particularly important to optimize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14
Inventor 戴会超戴凌全蒋定国吴丹凤陆姗姗
Owner CHINA YANGTZE POWER
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