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Frost-resistant and crack-proof concrete and preparation method and application thereof

A concrete and anti-cracking technology, applied in dams, barrages, weirs, etc., can solve the problems of easy cracking of panels, easy segregation of fresh concrete, poor impermeability, etc., to speed up the progress, save repeated tests and Adjustment, the effect of strong crack resistance

Inactive Publication Date: 2019-02-26
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the super high face rockfill dam in the prior art that the face is easy to crack, the frost resistance and anti-seepage ability are poor, and the fresh concrete is easy to segregate during the construction process, so as to provide a Freeze-resistant and anti-crack concrete and its preparation method and application

Method used

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  • Frost-resistant and crack-proof concrete and preparation method and application thereof
  • Frost-resistant and crack-proof concrete and preparation method and application thereof
  • Frost-resistant and crack-proof concrete and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0053] The present embodiment provides a kind of preparation method of frost-resistant and anti-crack concrete, specifically comprises the following steps:

[0054] Polyvinyl alcohol, glycerol, tetraethyl orthosilicate and calcium formate are fully mixed at a mass ratio of 52:11:21:10 to obtain a shrinkage reducing agent; polycarboxylate ether, sodium naphthalene xanthate formaldehyde polymer and sulfamic acid The sodium is fully mixed according to the mass ratio of solid content of 82:9:4 to obtain a water reducer; the polycarboxylate ethyl ether and sodium rosinate are fully mixed according to the mass ratio of solid content of 78:14, and the mixed liquid is added to the mixed liquid. % polyvinyl alcohol cross-linked polymer to obtain an air-entraining agent; magnesium oxide, aluminum powder and sodium aluminate are fully mixed at a mass ratio of 89:1.2:6.5 to obtain an expansion agent. Continuously graded artificial crushed stones with a nominal particle size of 20-40mm and...

Embodiment 2

[0060] The present embodiment provides a kind of preparation method of frost-resistant and anti-crack concrete, specifically as follows:

[0061] Polyvinyl alcohol, glycerol, tetraethyl orthosilicate and calcium formate are fully mixed in a mass ratio of 58:14:23:11 to obtain a shrinkage reducing agent; polycarboxylate, sodium naphthalene xanthate formaldehyde polymer and sulfamic acid Formaldehyde polymer is fully mixed according to the mass ratio of solid content of 87:11:7 to obtain a water reducer; polycarboxylate sodium sulfate and rosin formaldehyde are fully mixed according to the mass ratio of solid content of 86:22, and the mixed liquid is added to the mixed liquid 4% by mass of polyvinyl alcohol cross-linked polymer to obtain an air-entraining agent; magnesium oxide, aluminum powder and sodium aluminate are fully mixed at a mass ratio of 92:1.5:9.8 to obtain an expansion agent. Continuously graded artificial crushed stones with a nominal particle size of 20-40mm and ...

Embodiment 3

[0067] The present embodiment provides a kind of preparation method of frost-resistant and anti-crack concrete, specifically as follows:

[0068] The maximum dam height of a rockfill face dam in North China is 120.3m, the maximum slant length of the reinforced concrete face is nearly 203m, and the concrete pouring volume is 34,000m 3 , with a total area of ​​66,900 m 2 . The concrete face rockfill dam is located in a cold region, and the lowest recorded temperature in winter can reach -40°C. The face plate of the face rockfill dam is required to be frost-resistant.

[0069] Polyvinyl alcohol, glycerol, tetraethyl orthosilicate and calcium formate are fully mixed at a mass ratio of 52:14:23:11 to obtain a shrinkage reducing agent; polycarboxylated acrylic acid, sodium naphthalene xanthate formaldehyde polymer and sulfamic acid The lignin graft copolymer is fully mixed according to the mass ratio of solid content of 82:11:7 to obtain a water reducing agent; the polycarboxylate...

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Abstract

The invention belongs to the technical field of concrete preparation, and in particular, relates to frost-resistant and crack-proof concrete suitable for one-time forming of a super high face plate rockfill dam face plate, and a preparation method and an application thereof. The concrete includes cement, a mineral additive, a shrinkage reducing agent, a water reducing agent, an air entraining agent, an expansive agent, mixed fibers, an aggregate mixture and water. Through adjusting and choosing the composition and proportion, the frost-resistant grade of the obtained concrete exceeds F400, thecrack-proof grade is grade I, and the anti-permeability ability is not lower than W12 grade. The collapsibility of newly blended concrete prepared by the method is controlled at 50-70 mm; no separation phenomenon of slurry and a skeleton exists in a process of chute pouring, and the requirement of continuous pouring of the face plate rockfill dam face plate. In addition, the amount of the cementand the mineral additive in the concrete and the water-binder ratio of the concrete are optimized by a calculation formula obtained from extensive experiments and summaries, so the repeated experiments and adjustment processes required in preparation of traditional face plate concrete are omitted and the process of determination of the mixing proportion is simplified.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, and in particular relates to a frost-resistant and crack-resistant concrete suitable for one-time forming of the face of a super-high face rockfill dam, a preparation method and application thereof. Background technique [0002] Concrete face rockfill dam is a kind of rockfill dam with rockfill body as the support structure, and concrete face is set on the upstream surface as a self-defense structure. The dam industry generally believes that the concrete face rockfill dam with a dam height of more than 150m is called super High deck dam. Concrete face rockfill dams have good adaptability to terrain and geological conditions, strong adaptability to rainy and harsh climates, less demand for external materials, relatively small engineering volume, fast construction speed, safe operation, and easy maintenance. It is a common type of earth-rock dam used in water conservancy projects at h...

Claims

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Application Information

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IPC IPC(8): C04B28/04E02B7/06C04B111/76C04B111/34
CPCC04B28/04C04B2111/343C04B2111/76C04B2201/50E02B7/06C04B2103/302C04B2103/304C04B24/2623C04B24/026C04B24/04C04B24/42C04B22/066C04B22/04C04B22/08C04B16/0641C04B16/0616C04B14/02C04B14/06
Inventor 李斌周世华刘双华孟宪磊贾涛孔德轩王兰普贾晋王润吕风英孔张宇石艳龙董芸李杨王磊
Owner STATE GRID CORP OF CHINA
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