Chlorine-free, fluorine-free and alkali-free liquid accelerator as well as preparation method and application thereof
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An accelerator, liquid technology, applied in the field of concrete admixtures, which can solve problems such as damage, corrosion and irritation
Active Publication Date: 2022-02-08
BEIJING ACAD OF BUILDING ENG
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Alkaline quick-setting agent has a strong stimulating and corrosive effect on the eyes, skin and respiratory system of construction workers. Although necessary labor protection measures are taken during operation, it will still cause harm to personnel engaged in spraying construction for a long time
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[0056] According to the total weight of the liquid quick-setting agent configured as 1kg, the formula weight (g) of each component of Examples 1-8 is shown in the following table:
[0057] Table 1 Embodiment 1-8 formula details
[0058]
[0059]Note: (1) / means that the raw material is not added; (2) the balance means that the total weight of the system is made up to 1kg with water.
[0060] The liquid accelerator that embodiment 1-8 claims protection adopts following method to prepare
[0061] A preparation method of a chlorine-free, fluorine-free, alkali-free liquid quick-setting agent, comprising the following steps:
[0062] S1: Put the stabilizer into the water according to the proportion of the formula, and stir evenly;
[0063] S2: Add aluminum sulfate according to the recipe amount, continue to stir until uniform, then add the complexing agent in the recipe amount, stir until completely dissolved, and form a uniform liquid;
[0064] S3: Add the early strength ag...
Embodiment 1
[0099] The liquid quick-setting agent obtained in Examples 1-8 and the alkaline quick-setting agent obtained in Comparative Example 1 are similar in shortening the initial setting time of the clean slurry, especially the initial setting of the clear slurry mixed with Example 1 and Example 3 The time is also faster than that of Comparative Example 1; and in terms of the final setting time of the clean slurry, the performance of the liquid accelerators obtained in Examples 1-8 is better than that of the alkaline accelerators obtained in Comparative Example 1.
[0100] As can be seen from Table 2, the liquid quick-setting agent prepared by the present application has a lower alkali content compared with Comparative Example 1, that is to say, it has a better quick-setting effect under the premise of reducing the amount of alkali, so that the concrete can be Gain strength faster, which in turn facilitates shotcrete construction.
[0101] 2.2 Determination of the strength of mortar ...
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Abstract
The invention specifically discloses a chlorine-free, fluorine-free and alkali-free liquid accelerator as well as a preparation method and application thereof. The chlorine-free, fluorine-free and alkali-free liquid accelerator is prepared from the following components in parts by weight: 400 to 600 parts of aluminum sulfate, 20 to 120 parts of early strength agent, 5 to 22 parts of stabilizer and 300 to 500 parts of water, wherein the early strength agent is composed of an early strength main agent and an early strength auxiliary agent; the weight of the early strength main agent is not less than 50% of the total weight of the early strength agent; the early strength main agent is a mixture of diethanolamine and N-methyldiethanolamine; the early strength auxiliary agent is a mixture of magnesium sulfate heptahydrate and anhydrous sodium carbonate or magnesium sulfate heptahydrate. The preparation method comprises the following steps: S1, blending the stabilizer and water, and uniformly stirring; S2, adding aluminum sulfate, uniformly stirring, adding a complexing agent, and stirring until the complexing agent is completely dissolved; S3, finally adding the early strength agent, and continuously stirring to obtain a finished product. The chlorine-free, fluorine-free and alkali-free liquid accelerator can be used for improving the early strength of concrete, accelerating the solidification of the concrete and reducing the later strength shrinkage of the concrete.
Description
technical field [0001] The application relates to the field of concrete admixtures, more specifically, it relates to a chlorine-free, fluorine-free, alkali-free liquid quick-setting agent and its preparation method and application. Background technique [0002] Concrete quick-setting agent is a chemical admixture that can make cement or concrete set quickly, and is sometimes called a setting accelerator. Its main function is to accelerate the setting and hardening speed of shotcrete, reduce the rebound loss, prevent the shotcrete from falling off due to gravity, increase the thickness of one shot and shorten the interval between shot layers, etc. At present, the accelerator has been widely used in the shotcrete construction of underground projects such as tunnels, urban construction, water conservancy and electric power culverts, water diversion tunnels, self-waterproof shotcrete support, leak prevention, and plugging construction, rapid construction of ground concrete, and ...
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