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Liquid alkali-free accelerator and preparation and application thereof

A technology of quick-setting agent and liquid, which is applied in the field of engineering construction, can solve the problems of poor cement adaptability, etc., and achieve the effects of increased strength, good adaptability, and simple production process

Inactive Publication Date: 2019-04-19
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the above-mentioned non-alkali quick-setting agent has poor adaptability to cement, one of the purposes of the present invention is to provide a liquid non-alkali quick-setting agent, whose production raw materials are easy to obtain, the equipment used has no special requirements, and the operation is simple; It has the characteristics of less mixing amount, good long-term storage stability, and wide applicability to cement varieties, etc.

Method used

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  • Liquid alkali-free accelerator and preparation and application thereof
  • Liquid alkali-free accelerator and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 70kg of aluminum hydroxide and put it into the reaction kettle, then add 260kg of hydrofluoric acid solution with 20% mass content and stir (rotation speed 20-30 rpm) for about 20min, dissolve to a transparent solution, add 440kg of aluminum sulfate, and stir for 10-20min until complete Dissolve; add water 120kg.

[0041] Then add pH regulator NaOH solution (prepared by adding 10kg of NaOH and 80kg of water) to adjust the pH value to ≥ 2.0; add 12kg of triisopropanolamine, then slowly add 10kg of water glass, stabilizer, enhancer, and cosolvent, and stir until it becomes uniform The liquid is the liquid alkali-free accelerator. The distribution ratio of each component is shown in Table 1.

[0042] Let stand for 3 to 5 minutes, unload and pack.

Embodiment 2、3、4、5、6

[0044] The quick-setting agent preparation process of embodiment 2,3,4,5,6 is the same as embodiment 1, and the mass percent of each component is different. See Table 1 for details.

[0045]Table 1: Formula of embodiment 1-6 liquid alkali-free quick-setting agent

[0046]

[0047] Stabilizers, enhancers, pH regulators, and co-solvents need to act synergistically within an appropriate range. Among them, the pH regulator is more preferably 7% or less. In the case where no stabilizer, enhancer, pH regulator, and co-solvent were added (Example 6), the product was stored for three months, and precipitation was observed. The following cement setting tests were performed only with the products of Examples 1-5.

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Abstract

The invention brings forward a liquid alkali-free accelerator and preparation and application thereof. The liquid alkali-free accelerator comprises the following ingredients (by weight): 20-45% of aluminum sulfate, 15-25% of aluminium hydroxide, 10-35% of hydrofluoric acid, 0.5-2% of triisopropanolamine, 0.5-5% of water glass, 0-1% of a stabilizing agent, 1-5% of a reinforcing agent, 5-8% of a pHregulator, 0.2-0.5% of a cosolvent, and the balance water. The liquid alkali-free accelerator has the following advantages: the production process is simple, heating is not required, and ''three wastes (waste gas, waste water and industrial residue)'' are not generated; alkali etch of concrete structures is reduced, strength is enhanced, and durability of sprayed concrete is increased. With low dosage, Portland cement grout can be initially coagulated within 2 min and finally coagulated within 4 min; 1d strength of cement mortar can reach 15 MPa and above, and ratio of 28d compressive strengthis greater than 100%; and the liquid alkali-free accelerator has good adaptation to different kinds of cement.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a coagulant used in concrete construction. Background technique [0002] Accelerator is a chemical admixture that can make cement set quickly. Its use can make cement set and harden in a short time. It is mainly used in shotcrete and shotcrete construction. In recent years, due to the advantages of good construction environment, low springback and high construction efficiency, wet sprayed concrete has gradually replaced the traditional dry spraying process and has been widely used; in order to cooperate with this construction process, the accelerator used is liquid coagulant. [0003] At present, in the construction of tunnel engineering, the amount of sprayed concrete, mortar, and cement slurry is increasing day by day, but the alkali content of conventional quick-setting agent products is high. reaction, it is easy to increase the precipitation rate of alka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/06C04B22/126C04B24/122C04B12/04C04B24/124C04B24/04C04B2103/0094C04B24/32C04B28/02
Inventor 马伟斌马超锋马荣田倪光斌林传年郭小雄王志伟付兵先安哲立赵鹏柴金飞许学良
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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