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High-strength and low-hydration-heat marine concrete and preparation method thereof

A marine concrete, low hydration heat technology, applied in the field of marine concrete preparation, can solve the problems of large amount of cement and cementitious materials, poor crack resistance, lower temperature peak, etc., to reduce unit water consumption, uniform dispersion and compaction degree, the effect of improving fluidity

Active Publication Date: 2020-09-04
CHINA COMM 2ND NAVIGATIONAL BUREAU 2ND ENG +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The concrete structure of large sea-crossing bridges has the characteristics of high strength, high durability, and large structural section size. At present, the concrete used for pier bodies and main towers has a large amount of cement and cementitious materials, poor crack resistance, and prone to temperature stress cracks. Disadvantages such as high production costs
The adiabatic temperature rise of traditional C50 marine high-performance concrete is between 48 and 52°C. It is necessary to bury cooling water pipes inside the concrete, and use the water flowing in the pipes to take away the heat of hydration of the concrete to reduce the temperature peak. This is not conducive to the overall structural integrity of the concrete, and the compressive strength is reduced. In addition, because the marine concrete is used in the marine environment, the penetration of chloride ions is easy to corrode the steel bars in the concrete.

Method used

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  • High-strength and low-hydration-heat marine concrete and preparation method thereof
  • High-strength and low-hydration-heat marine concrete and preparation method thereof
  • High-strength and low-hydration-heat marine concrete and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a preparation method of high-strength low-heat-of-hydration marine concrete, comprising the following steps:

[0041] S1. Prepare limestone powder, cement, slag powder, fly ash, silica powder, water reducer, water, sand, and crushed stone. First, mix the limestone powder and cement evenly and then sieve to obtain the first mixture;

[0042] S2. Add slag powder to the first mixture, stir evenly and then sieve to obtain the second mixture;

[0043] S3. Add fly ash to the second mixture, stir evenly and then sieve to obtain the third mixture;

[0044] S4. Add silicon powder to the third mixture, stir evenly and then sieve to obtain the fourth mixture;

[0045] S5. After mixing the water reducer and water, add the fourth mixture, then stir, then add sand and stir, then add gravel, and finally stir to obtain high-strength and low-heat-of-hydration marine concrete.

[0046] First, mix the limestone powder and cement evenly, so that the li...

Embodiment 1

[0062] High-strength low-heat-of-hydration marine concrete consists of the following raw materials in parts by mass: 180 parts of cement, 90 parts of slag powder, 60 parts of fly ash, 60 parts of limestone powder, 20 parts of silica fume, 720 parts of sand, and 1150 parts of crushed stone , 135 parts of water, 5.1 parts of retarding polycarboxylate high-performance superplasticizer.

Embodiment 2

[0064] High-strength low-heat-of-hydration marine concrete is composed of the following raw materials in parts by mass: 200 parts of cement, 75 parts of slag powder, 50 parts of fly ash, 50 parts of limestone powder, 15 parts of silica fume, 680 parts of sand, and 1050 parts of crushed stone , 125 parts of water, 4.5 parts of retarding polycarboxylate high-performance superplasticizer.

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Abstract

The invention discloses high-strength and low-hydration-heat marine concrete and a preparation method thereof. Limestone powder and cement are uniformly stirred to enable the gaps of the cement particles to be filled with the limestone powder, so that the compactness of a cement base system is improved; then, slag powder and fly ash are added to improve the fluidity, cohesiveness and water retention of the concrete mixture, and therefore, the concrete mixture is easy to pump, pour and mold; then, silicon powder is added to form C-S-H gel, one part of the C-S-H gel coats the surface of a cementing material, the other part of the C-S-H gel fills the pores of sand, gravels and cement particles which are added later; and the cement particles are further helped to be dispersed through a water reducing agent, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved, so that the marine concrete with uniformly dispersed internal system particles and high compactness is finally obtained.

Description

technical field [0001] The invention relates to the technical field of marine concrete preparation. More specifically, the present invention relates to a high-strength low-heat-of-hydration marine concrete and a preparation method thereof. Background technique [0002] The concrete structure of large sea-crossing bridges has the characteristics of high strength, high durability, and large structural section size. At present, the concrete used for pier bodies and main towers has a large amount of cement and cementitious materials, poor crack resistance, and prone to temperature stress cracks. Disadvantages such as high production costs. The adiabatic temperature rise of traditional C50 marine high-performance concrete is between 48 and 52°C. It is necessary to bury cooling water pipes inside the concrete, and use the water flowing in the pipes to take away the heat of hydration of the concrete to reduce the temperature peak. This is not conducive to the overall structural i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/24
CPCC04B28/04C04B2201/50C04B2111/24C04B2111/74C04B18/141C04B18/08C04B14/28C04B18/146C04B14/068C04B2103/302
Inventor 曾序陶建飞汤生虎胡伟勋
Owner CHINA COMM 2ND NAVIGATIONAL BUREAU 2ND ENG
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