Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof

A technology of quick-setting agent and concrete, applied in the field of environment-friendly concrete quick-setting agent, can solve problems such as performance and adverse effects on human health, and achieve the effects of shortening the initial and final setting time, promoting cement hydration, and improving the quick-setting effect.

Active Publication Date: 2022-02-18
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an alkali-free, fluorine-free and chlorine-free liquid concrete quick-setting agent and its preparation method to solve the problem that alkali, chlorine and fluorine in the existing quick-setting agent have adverse effects on concrete performance and human health

Method used

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  • Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof
  • Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof
  • Alkali-free fluorine-free chlorine-free liquid concrete accelerator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The mass percent of each component of a liquid alkali-free, fluorine-free and chlorine-free concrete quick-setting agent is: 45% of aluminum sulfate, 1.5% of modified regulator, 3.5% of diethanolamine, 2% of magnesium sulfate, 1% of calcium formate, 1% of urea %, the rest is water, and the sum of each component is 100%.

[0022] The preparation method is:

[0023] Weigh according to the proportion of raw materials, first add water to the reaction kettle, stir while heating and gradually add aluminum sulfate; after the temperature is controlled at 55°C, add magnesium sulfate and calcium formate in sequence every 5 minutes, and continue to stir for 1.5 h; after natural cooling to room temperature, add urea, modified regulator and diethanolamine, and then stir for 20 minutes to control the pH of the quick-setting agent solution to 2.5 to obtain the finished liquid concrete quick-setting agent. The performance test results are shown in Table 1.

[0024] Among them, the pre...

Embodiment 2

[0026] The mass percent of each component of a liquid alkali-free, fluorine-free and chlorine-free concrete quick-setting agent is: 50.5% of aluminum sulfate, 1.8% of modified regulator, 4% of diethanolamine, 2.2% of magnesium sulfate, 2.5% of calcium formate, and 1.5% of urea %, the rest is water, and the sum of each component is 100%.

[0027] The preparation method is:

[0028] Weigh according to the ratio of raw materials, first add water to the reaction kettle, stir while heating and gradually add aluminum sulfate; after the temperature is controlled at 60°C, add magnesium sulfate and calcium formate in sequence every 7 minutes, and continue stirring for 1.8 hours After natural cooling to normal temperature, add urea, modified modifier and diethanolamine, and then stir for 25 minutes to control the pH of the quick-setting agent solution to 2.7 to obtain the finished liquid concrete quick-setting agent. The performance test results are shown in Table 1.

[0029] Among the...

Embodiment 3

[0031] The mass percent of each component of a liquid alkali-free, fluorine-free and chlorine-free concrete quick-setting agent is: 55% of aluminum sulfate, 2.5% of modified regulator, 5% of diethanolamine, 2.5% of magnesium sulfate, 3% of calcium formate, 2% of urea %, the rest is water, and the sum of each component is 100%.

[0032] The preparation method is:

[0033] Weigh according to the proportion of raw materials, first add water to the reaction kettle, stir while heating and gradually add aluminum sulfate; after the temperature is controlled at 65°C, add magnesium sulfate and calcium formate in sequence every 8 minutes, and continue stirring for 2 hours; After natural cooling to room temperature, add urea, modified regulator and diethanolamine, and then stir for 30 minutes to control the pH of the quick-setting agent solution to 3 to obtain the finished liquid concrete quick-setting agent. The performance test results are shown in Table 1.

[0034] Among them, the pr...

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Abstract

The invention discloses an alkali-free fluorine-free chlorine-free liquid concrete accelerator and a preparation method thereof, and relates to the technical field of environment-friendly concrete accelerators. The raw materials comprise 45%-55% of aluminum sulfate, 1.5%-2.5% of a modification regulator, 3.5%-5% of diethanol amine, 2%-2.5% of magnesium sulfate, 1%-3% of calcium formate, 1%-2% of urea, and the balance of water. The preparation method comprises the following steps: weighing the raw materials according to the ratio, adding water into a reaction kettle, stirring while heating, and gradually adding aluminum sulfate; after the temperature is controlled to be 55-65 DEG C, sequentially adding magnesium sulfate and calcium formate according to metering every 5-8 min, and carrying out continuous stirring reaction for 1.5-2 h; and naturally cooling to normal temperature, adding urea, the modified regulator and diethanol amine, stirring for 20-30 minutes, and controlling the pH value of the accelerator solution to be 2.5-3, thereby obtaining the finished liquid concrete accelerator. The finished product is transparent and uniform liquid, the density is 1.15 g / cm < 3 >1.2 g / cm < 3 >, and the alkali-aggregate reaction risk of the concrete can be greatly reduced; and all the raw materials do not contain chloride ions, fluorine ions and sodium ions, and erosion of the raw materials to the reinforced concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of environment-friendly concrete quick-setting agent, in particular to an alkali-free, fluorine-free and chlorine-free liquid concrete quick-setting agent and a preparation method thereof. Background technique [0002] Concrete quick-setting admixture is an admixture that can make concrete harden quickly when mixed into concrete. It is used to mix in shotcrete in projects such as mine well projects, railway tunnels, water diversion culverts, and underground engineering. The products of traditional accelerators are mainly alkali, chlorine, fluorine, and powder. This type of accelerator is highly corrosive, especially the presence of free forms such as fluorine and chlorine, which will cause alkali-aggregate reactions in concrete. , Steel bar corrosion and other issues, and the requirements for construction equipment are also high, which seriously affects the later strength and carbonation resistance durabilit...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B24/122C04B22/142C04B24/04C04B24/126C04B24/06C04B24/026C04B24/045C04B22/141
Inventor 刘波李志祥马航张应虎
Owner YUNNAN YUNTIANHUA
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