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High-performance anti-freezing concrete and preparation method thereof

A concrete and high-performance technology, which is applied in the field of high-performance frost-resistant concrete and its preparation, can solve the problems of limited frost resistance of concrete, and achieve the effects of light specific gravity, improved impermeability, and reduced water-cement ratio

Inactive Publication Date: 2020-05-05
武汉君善建混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the ice crystals generated in the concrete are small and do not form large ice cubes by adding one or more of gelatin, agar, and guar gum to the antifreeze concrete, thereby reducing freezing Freezing damage to concrete
However, gelatin, agar and guar gum are easily decomposed by enzymes and bacteria and are difficult to exist stably in concrete mixtures, resulting in very limited benefits to the frost resistance of concrete

Method used

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  • High-performance anti-freezing concrete and preparation method thereof
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  • High-performance anti-freezing concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-performance frost-resistant concrete, the content of each component is shown in Table 1.

[0040] Among them, the aggregate is composed of stone, medium sand and fine sand with a mass ratio of 4:2:1.

[0041] Antifreeze is methanol.

[0042] The air-entraining agent is rosin thermal polymer PC-2 air-entraining agent.

[0043] The preparation method of the high-performance frost-resistant concrete comprises the following steps:

[0044] S1. Aggregate pre-dispersion: Mix the stones, medium sand and fine sand in the aggregate and stir at a constant speed of 30r / min for 20min until the stones, medium sand and fine sand are evenly dispersed;

[0045] S2. Powder dispersion: Add cement, mineral powder, and silica fume to the aggregate in step S1, and stir at a constant speed of 120r / min for 1h until the stirring and dispersion are uniform;

[0046] S3. Water agent dispersion: add water, high-efficiency water reducer, air-entraining agent and antifreeze to the mixture...

Embodiment 2

[0051] A high-performance frost-resistant concrete, the content of each component is shown in Table 1.

[0052] Among them, the aggregate is composed of stone, medium sand and fine sand with a mass ratio of 4:3:1.

[0053]Antifreeze is ethylene glycol.

[0054] The air-entraining agent is sodium dodecylbenzenesulfonate.

[0055] The preparation method of the high-performance frost-resistant concrete comprises the following steps:

[0056] S1. Aggregate pre-dispersion: Mix the stones, medium sand and fine sand in the aggregate and stir at a constant speed of 30r / min for 25 minutes until the stones, medium sand and fine sand are evenly dispersed;

[0057] S2. Powder dispersion: Add cement, mineral powder, and silica fume to the aggregate in step S1, and stir at a constant speed of 125r / min for 1.1h until the stirring and dispersion are uniform;

[0058] S3. Water agent dispersion: add water, high-efficiency water reducer, air-entraining agent and antifreeze to the mixture in ...

Embodiment 3

[0061] A high-performance frost-resistant concrete, the content of each component is shown in Table 1.

[0062] Among them, the aggregate is composed of stone, medium sand and fine sand with a mass ratio of 5:2:1.

[0063] Antifreeze is a mixture of methanol and ethylene glycol in a weight ratio of 1:1.

[0064] The air-entraining agent is sodium lauryl fatty alcohol sulfate.

[0065] The preparation method of the high-performance frost-resistant concrete comprises the following steps:

[0066] S1. Aggregate pre-dispersion: Mix the stones, medium sand and fine sand in the aggregate and stir at a constant speed of 30r / min for 30min until the stones, medium sand and fine sand are evenly dispersed;

[0067] S2. Powder dispersion: Add cement, mineral powder, and silica fume to the aggregate in step S1, and stir at a constant speed of 130r / min for 1.2h until the stirring and dispersion are uniform;

[0068] S3. Water agent dispersion: add water, high-efficiency water reducer, ai...

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Abstract

The invention discloses high-performance anti-freezing concrete and a preparation method thereof, and relates to the technical field of concrete preparation and production. The high-performance anti-freezing concrete comprises the following components by weight: 1200-1500 parts of aggregate, 150-180 parts of cement, 50-80 parts of mineral powder, 7-12 parts of a superplasticizer, 2-5 parts of an air entraining agent, 4-6 parts of an antifreeze agent, and 140-160 parts of water, wherein the aggregate comprises stones, medium sand and fine sand in a mass ratio of (4-5): (2-3): 1. The preparationmethod of the high-performance anti-freezing concrete comprises the following steps: S1, pre-dispersing an aggregate; S2, dispersing powder; S3, dispersing an aqueous solution; and S4, dispersing fibers. The anti-freezing concrete has the technical effects that the anti-freezing performance of concrete can be stably improved and the comprehensive performance is excellent.

Description

technical field [0001] The invention relates to the technical field of concrete preparation and production, in particular to a high-performance frost-resistant concrete and a preparation method thereof. Background technique [0002] Our country has a vast territory, and a considerable part is in the severe cold zone, resulting in many hydraulic structures being damaged by freezing and thawing. According to the national survey on the durability of hydraulic structures, among the 32 large-scale commercial concrete dam projects and more than 40 small and medium-sized projects, 22% of the dams and 21% of the small and medium-sized hydraulic structures have freeze-thaw damage problems. The freeze-thaw damage of ready-made concrete for dams is mainly concentrated in the northeast, north and northwest regions. Especially in the severe cold region of Northeast China, almost 100% of the constructed hydraulic concrete structures suffer from freezing and thawing damage in different de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B111/76
CPCC04B28/02C04B2111/76C04B2201/50C04B18/12C04B14/02C04B14/06C04B2103/302C04B24/34C04B24/02C04B18/146C04B16/0633C04B14/386C04B24/20C04B24/16
Inventor 解聪夏文学谭梨陈利
Owner 武汉君善建混凝土有限公司
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