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Low-temperature-resistant high-efficiency anti-freezing agent for concrete

An antifreeze and concrete technology, applied in the field of concrete admixture, can solve the problems of accelerated concrete slump loss, increased on-site labor intensity, low solubility, etc., achieves early strength and better antifreeze and antifreeze performance, and highlights substantive features , good water solubility

Inactive Publication Date: 2012-05-30
DALIAN CHUANGDA TECH TRADE MARKET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of antifreeze in concrete and the high salt content, the following problems are unavoidable: 1. Due to the large dosage (based on 350kg of cement per cubic meter of concrete, if mixed with 4-7% antifreeze, the dosage is 14-24. 5kg), the quality of the concrete is difficult to control; 2. High salt content in concrete is detrimental to the long-term durability of concrete, and the solubility of salt at low temperature is very low. In order to prevent the inhomogeneity of salt in concrete, it is necessary to add quite a lot of carriers (such as fly ash, cement, ore, etc.) Powder, silicon powder, etc.); 3. It is not suitable for the use of existing commercial concrete mixing plants. Because it is mixed with a large amount of carriers and cannot be dissolved in water, the original metering device and feeding equipment of the mixing plant cannot be used, and additional configuration is required, which increases investment and difficulty
In addition, although the unit price is low, the cost per cubic meter of concrete is high due to the large amount of mixing, and the transportation volume is large, and the labor intensity on site is increased, which cannot give full play to the characteristics and advantages of centralized mixing of commercial concrete; 4. It is not suitable for pumping concrete in winter, because there are many carriers and high salt content, the loss of concrete slump is accelerated, and it cannot be transported and pumped over long distances, and the amount of bleeding increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0011] Example 1: The components and proportions of the high-efficiency antifreeze are: 1 part of sodium sulfate, 0.98 parts of organic polymer material, 0.02 parts of air-entraining water reducing agent, and all components are fully mixed and uniform. Add 1% of cement weight to 525# ordinary Portland cement, with W / C-0. S is added to the mixing water to measure the fluidity of the cement paste> 170mm, indicating that the water reduction and enhancement effect is good.

Embodiment 2

[0012] Example 2: Effect on the performance of ordinary concrete with a slump of 3+1cm and C30 grade. The composition and ratio of the high-efficiency antifreeze are the same as in Example 1.

[0013] Among them, the benchmark concrete ratio is cement: water: sand: stone=1:0.49:1.93:3.43.

[0014] The ratio of the inspected ordinary concrete and the inspected negative temperature ordinary concrete is:

[0015] Cement: water: sand: stone = 1: 0.39: 1. 80: 3.49.

[0016] The sand rate is 34%, the water reduction rate is 21%, and the mixing amount of high-efficiency antifreeze is 196 of the cement weight.

[0017] Specimen size: 10×10x lOcm, three pieces per group.

[0018] The benchmark concrete does not add any additives, and the average compressive strength after 28 days of standard curing is represented by R;

[0019] The average compressive strength of the tested concrete plus 1% high-efficiency antifreeze after 28 days of standard curing is represented ...

Embodiment 2）

[0025] The components of the low-temperature product are: 0.06 parts of superplasticizer, 0.03 parts of ordinary water reducer, 0.30 parts of sodium nitrite, 0.2 parts of sodium sulfate, 0.41 parts of carrier, and the experimental conditions are the same as this embodiment, but antifreeze The dosage is 8% of the cement weight, and the compressive strength ratio (see Example 2 of Document 1) is:

[0026] R 28 =R CA / Rc=91.7%

[0027] R -7+28 =Rc= 95.7%

[0028] R -7+56 =R AT / R C =104.5%

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Abstract

The invention discloses a low-temperature-resistant high-efficiency anti-freezing agent for concrete. The low-temperature-resistant high-efficiency anti-freezing agent is composed of the follows components in percentage by weight: 30-68% of a sodium salt early strengthening agent, 28-69% of an organic macromolecular material and 0.5-2.0% of a gas-introducing and water-reducing agent. Compared with the conventional anti-freezing agent, the low-temperature-resistant high-efficiency anti-freezing agent for concrete has the characteristics of less addition amount in concrete, good water solubility, low salt content and high early strength of concrete; the low-temperature-resistant high-efficiency anti-freezing agent can be applied to the construction of ordinary concrete in winter, and also can be applied to the construction of pumping concrete and commercial concrete in winter; and the low-temperature-resistant high-efficiency anti-freezing agent for concrete has the advantages of good performance, wide application range and high use efficiency.

Description

Technical field [0001] The invention belongs to a concrete admixture and relates to a high-efficiency antifreeze for concrete anti-low temperature. [0002] Especially the antifreeze for pumping concrete and commercial concrete in winter. Background technique [0003] In order to prevent frost damage to concrete constructed under negative temperature, antifreeze is generally added to concrete mixtures. There are many varieties, and most of them are compounded with nitrite, nitrate, sulfate, carbonate, urea, etc. and water reducing agent. The general dosage is 5-10% of the weight of cement in the concrete, and the sodium salt content is also high. The composite antifreeze for concrete construction disclosed by application number 92102097.X (publication number CN1076920A) (hereinafter referred to as document 1) is composed of superplasticizers, common water reducers, high-active components, carriers, and sodium salts. The mixing amount in concrete is 4 to 7% of the weight of cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24
Inventor 王爽
Owner DALIAN CHUANGDA TECH TRADE MARKET
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