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Low-alkali liquor accelerator for spraying concrete

A technology of shotcrete and quick-setting agent, applied in the field of low-alkali liquid quick-setting agent, can solve problems such as inability to achieve, and achieve the effect of good adaptability

Inactive Publication Date: 2008-03-12
陕西金石混凝土科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to prevent alkali-aggregate reaction, the construction specifications of some key projects such as railway passenger dedicated lines require that the total alkali content of the admixture must be less than 10%, and the total alkali content of the admixture in each cubic concrete shall not exceed 1Kg, while ordinary alkali Accelerators cannot meet the above requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0038] Raw materials (% by weight) used for alkali metal aluminates:

[0039] Aluminum hydroxide (industrial first-class product): 52%, sodium hydroxide: 28%, tap water: 20%.

[0040] The above raw materials are added to the reactor at one time, stirred and heated, the reaction temperature is controlled at 80°C to 120°C, and the reaction time is controlled at 1 hour to 2 hours to obtain the alkali metal aluminate.

[0041] Raw materials for diluent:

[0042] Hydrofluoric acid (30% concentration): 8%, sodium hydroxide: 5%, tap water 87%.

[0043] The above raw materials are sequentially added into the reaction kettle, stirred and heated, the reaction temperature is controlled between 70°C and 100°C, and the reaction time is controlled between 0.5 hour and 1 hour to obtain the diluent.

[0044] The low-alkali liquid quick-setting agent of the present invention can be obtained by uniformly mixing 1 part of the above-mentioned alkali metal aluminate and 3.5 parts of diluent. Wh...

preparation Embodiment 2

[0046] Raw materials (% by weight) used for alkali metal salts:

[0047] Aluminum hydroxide (grade 2-1): 44%, sodium hydroxide: 26%, tap water: 30%.

[0048]The above raw materials are sequentially added into the reaction kettle, stirred and heated, the reaction temperature is controlled at 90° C. to 120° C., and the reaction time is controlled for 1.5 hours to 3 hours to obtain the alkali metal aluminate.

[0049] Raw materials for diluent:

[0050] Fluosilicic acid (30% concentration): 20%, zinc carbonate: 5%, tap water: 75%.

[0051] The above raw materials are sequentially added into the reaction kettle, stirred and heated, the reaction temperature is controlled between 70°C and 100°C, and the reaction time is controlled for 10min to 30min to obtain the diluent.

[0052] Mix evenly 1 part of the alkali metal aluminate obtained above with 3 parts of diluent to obtain the low-alkali liquid quick-setting agent of the present invention, wherein the alkali content is lower th...

preparation Embodiment 3

[0054] Raw materials (% by weight) used for alkali metal aluminates:

[0055] Aluminum hydroxide (industrial first-class product): 35%, sodium hydroxide: 25%, tap water: 40%.

[0056] The above raw materials are sequentially added into the reactor, stirred and heated, the reaction temperature is controlled at 90° C. to 120° C., and the reaction time is controlled at 1 hour to 2 hours to obtain the alkali metal aluminate.

[0057] Raw materials for diluent:

[0058] Triethanolamine: 9%, Oleic Acid: 3%, Tap Water: 88%.

[0059] The above raw materials are sequentially added into the reaction kettle, the reaction temperature is controlled between 40°C and 60°C, and the reaction time is controlled for 10min to 30min to obtain the diluent.

[0060] The low-alkali liquid quick-setting agent of the present invention can be obtained by uniformly mixing 1 part of the alkali metal aluminate obtained above with 2.5 parts of diluent, and the alkali content is less than 6%.

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Abstract

The present invention discloses a low-alkaline liquid accelerator used for ejecting the concrete, which is made of the alkali metals aluminate and the thinner mixing with the weight ratio of 1: (1-6), wherein, the alkali metals aluminate consists of aluminium hydroxide, alkali metals hydroxid and water; the thinner consists of hydrofluoric acid, metals hydroxid and water according to weight ratio; or the thinner consists of fluosilicic acid, metals hydroxid and water according to weight ratio; or the thinner consists of alcohol amine alkane, organic acid or inorganic acid and water according to weight ratio; the present invention is a low-alkaline liquid accelerator used for ejecting the concrete; the alkali content is between 3 and 6 percent; so the adaptability to the cement is much better. The present invention can be widely used in the cement with each type, such as Portland cement, common Portland cement, high-early (strength) cement, high-early-strength cement, middle-heat cement and low-heat cement and so on. If the weight ratio of the liquid accelerator occupies 2 to 6 percent of the total cement water weight in the ejecting concrete, the collocation can realize the standard JC477-2005 technical requirement in the construction material industry in China.

Description

technical field [0001] The invention relates to a quick-setting agent for concrete cementitious materials, especially a low-alkali liquid quick-setting agent suitable for sprayed concrete. The quick-setting agent can be widely used in tunnels, underground caverns, building foundation pits, slope protection, etc. Construction of shotcrete. Background technique [0002] Shotcrete is the use of spraying machinery, compressed air or other power to add accelerators to the concrete mixture in a certain proportion, transport it through pipelines and spray it on the rock surface, structures and buildings to be sprayed at high speed, and A type of concrete that hardens rapidly. It can effectively prevent tunnels or basements, slopes, and building foundation pits from collapsing and landslides, and play the role of temporary support or permanent support, and can also reinforce existing buildings and structures. Therefore, shotcrete must reach the initial and final setting within the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C04B103/12
CPCC04B2103/12C04B28/02
Inventor 王宏军李向东张朝富杜宝中
Owner 陕西金石混凝土科技发展有限公司
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