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Emulsion-type accelerator special for sprayed concrete

A shotcrete and emulsion type technology, applied in the field of building materials, can solve the problems of decreased concrete strength and durability, high alkali content, and more dust, and achieve the improvement of the retention rate of compressive strength, the improvement of specific surface area, and the durability. Sex-enhancing effect

Inactive Publication Date: 2019-03-08
邹峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Alkaline powder and alkaline liquid accelerators have the following problems: ①Large strength loss in the later stage; ②High alkali content, on the one hand, causes corrosion to construction personnel and damages human health, on the other hand, it may also cause concrete Alkali-aggregate reaction, resulting in a decrease in concrete strength and durability; ③A lot of dust and a large amount of rebound; ④It is not convenient for sprayed concrete wet operation, etc.
At present, the liquid quick-setting agent used in traditional concrete has a high alkali content, which not only damages the health of workers, but also easily causes a decrease in the durability of concrete. In addition, its 28-day compressive strength retention rate is low, so it needs to be adjusted. research

Method used

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  • Emulsion-type accelerator special for sprayed concrete

Examples

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example 1

[0020] In parts by weight, take 30 parts of sepiolite successively, 100 parts of dilute hydrochloric acid with a mass fraction of 10%, first mix the sepiolite and dilute hydrochloric acid into the hydrothermal kettle, then seal the hydrothermal kettle, and heat the hydrothermal kettle at a temperature of 150 ℃, the pressure is 2.7MPa, the stirring speed is 500r / min, after hydrothermal stirring reaction for 5h, the hydrothermal kettle is opened, the pressure is released to normal pressure, the material is discharged, and the filter cake is obtained by suction filtration, and the filter cake is washed with deionized water. Cake 5 times, then transfer the washed filter cake to an oven, and dry it to a constant weight at a temperature of 110°C to obtain a dry filter cake, then transfer the resulting dried filter cake to a tube furnace, and dry it at a temperature of 260°C Under the condition of ℃, roast for 3 hours, and discharge the material to obtain activated sepiolite; in parts...

example 2

[0022]In parts by weight, successively take 40 parts of graphene oxide, 200 parts of water, 10 parts of sodium polystyrene sulfonate, and 10 parts of octadecylamine, first mix graphene oxide and water into a beaker, and then Move the beaker into an ultrasonic disperser, and ultrasonically disperse for 60 minutes at an ultrasonic frequency of 60 kHz to obtain a graphene oxide dispersion, then add the obtained graphene oxide dispersion and octadecylamine into a three-necked flask, and transfer the three-necked flask to To the digital display speed measuring constant temperature magnetic stirrer, under the condition of temperature of 85 ℃ and rotating speed of 600r / min, heat and stir for 5 hours, then add sodium polystyrene sulfonate into the three-necked flask under constant temperature stirring, and continue stirring at constant temperature After reacting for 2 hours, filter to obtain the filter residue, and wash the filter residue 5 times with deionized water, then transfer the...

example 3

[0024] In parts by weight, successively take 40 parts of graphene oxide, 200 parts of water, 10 parts of sodium polystyrene sulfonate, and 10 parts of octadecylamine, first mix graphene oxide and water into a beaker, and then Move the beaker into an ultrasonic disperser, and ultrasonically disperse for 60 minutes at an ultrasonic frequency of 60 kHz to obtain a graphene oxide dispersion, then add the obtained graphene oxide dispersion and octadecylamine into a three-necked flask, and transfer the three-necked flask to To the digital display speed measuring constant temperature magnetic stirrer, under the condition of temperature of 85 ℃ and rotating speed of 600r / min, heat and stir for 5 hours, then add sodium polystyrene sulfonate into the three-necked flask under constant temperature stirring, and continue stirring at constant temperature After reacting for 2 hours, filter to obtain the filter residue, and wash the filter residue 5 times with deionized water, then transfer th...

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Abstract

The invention discloses an emulsion-type accelerator special for sprayed concrete, and belongs to the technical field of building materials. The developed accelerator is formed by activated sepiolite,polyethyleneimine, modified nano oxidized graphene and water. A preparation method comprises the following steps: in a preparation process, firstly weighing each component according to a raw materialcomposition, adding the activated sepiolite, the polyethyleneimine, the modified nano oxidized graphene and the water to a high-pressure reaction kettle, and continuously feeding a carbon dioxide gasto the reaction kettle, after a pressure is risen to 0.6-0.8 MPa, stopping feeding, stewing, after the pressure in the reaction kettle is reduced to 0.3-0.5 MPa, opening the reaction kettle, depressurizing until a normal pressure, and discharging, to obtain the emulsion-type accelerator special for the sprayed concrete. The obtained emulsion-type accelerator special for the sprayed concrete has excellent long-term strength and durability.

Description

technical field [0001] The invention discloses a special emulsion-type quick-setting agent for sprayed concrete, which belongs to the technical field of building materials. Background technique [0002] Accelerator has become one of the important components of shotcrete due to its remarkable characteristics in quick setting and early strength. It is widely used in underground caverns, underground powerhouses, slope support, traffic tunnels and some emergency repair projects in water conservancy projects. . So far, the accelerator has mainly experienced the development process from the early alkaline powder accelerator to the medium-term low-alkali accelerator, and then to the recent liquid alkali-free accelerator. Traditional concrete accelerators are not convenient for sprayed concrete wet work, and have obvious defects in setting time, early compressive strength, later compressive strength ratio, construction personal safety, dust and rebound. [0003] Accelerator is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/12
CPCC04B40/0039C04B2103/12C04B22/00C04B24/2652C04B22/06C04B24/163C04B24/121
Inventor 邹峰许正祥朱东东
Owner 邹峰
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