Efficient thixotropic agent for tunnel lining concrete and preparation method of efficient thixotropic agent

A thixotropic agent and concrete masonry technology, which is applied in the field of building materials, can solve the problems of limited thixotropic effect of high-fluidity concrete, loss of concrete thixotropic effect over time, and large fluctuations in concrete work performance, etc., to achieve thixotropic function Good retention, improved injection efficiency and perfusion quality, and excellent fluidity

Inactive Publication Date: 2020-08-14
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

[0006] (1) The amount of thixotropic agent added is large, the degree of matching with the water reducing agent is not high, and the performance of concrete fluctuates greatly;
[0007] (2) The thixotropic effect is general, and the thixotropic effect on high-fluidity concrete is limited, especially under external disturbances such as vibration, the thixotropic ability drops seriously;
[0008] (3) The retention of the thixotropic agent is low, and the thixotropic effect of concrete is seriously lost over time;
[0009] (4) The thixotropic agent contains a large number of hydroxyl groups, or in order to improve the retentive hydrolysis to generate small molecular polyols, which will retard the concrete and seriously affect the early strength of concrete
[0010] Therefore, in view of the above problems, a high-efficiency thixotropic agent for tunnel lining concrete has been invented. It has excellent thixotropic effect, strong thixotropic effect retention ability, no influence on the setting time of concrete, and can effectively improve the stability of concrete in confined and long spaces. It can solve the segregation problem caused by large height difference free fall and long-term vibration, etc., and ensure the pouring efficiency and construction quality of tunnel lining concrete

Method used

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  • Efficient thixotropic agent for tunnel lining concrete and preparation method of efficient thixotropic agent
  • Efficient thixotropic agent for tunnel lining concrete and preparation method of efficient thixotropic agent
  • Efficient thixotropic agent for tunnel lining concrete and preparation method of efficient thixotropic agent

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Effect test

Embodiment 1

[0033] In aqueous solution, use ethylene glycol monovinyl polyglycol ether, acrylic acid, hydroxyethyl acrylate, dimethylaminoethyl methacrylate, chain transfer agent, oxidizing agent and reducing agent to synthesize long effective dispersant; in aqueous solution, use sodium propenyl sulfonate, hydroxyethyl acrylate, chain transfer agent, oxidizing agent and reducing agent to synthesize thickener at 35°C±5°C; then add 10 parts of long-acting dispersant, 20 After mixing 1 part of water, 0.5 part of thickener and 0.6 part of ether defoamer, stir well at 50°C±5°C, add 0.4 part of sodium sulfate and stir well, add 4 parts of fumed silica and use high-speed stirring to stir well After that, you get it.

Embodiment 2

[0035]In aqueous solution, use n-butylene glycol monovinyl polyglycol ether, acrylic acid, methacrylic acid, hydroxypropyl acrylate, methacryloyloxyethyltrimethylammonium chloride, chain transfer agent, oxidizing agent and reducing long-acting dispersant at 40°C±5°C; in aqueous solution, use sodium propenyl sulfonate, hydroxyethyl acrylate, chain transfer agent, oxidizing agent and reducing agent to synthesize thickener at 35°C±5°C; Then mix 20 parts of long-lasting dispersant, 60 parts of water, 2.5 parts of thickener, 0.5 parts of silicone defoamer, and 0.7 part of ether defoamer, stir well at 50°C±5°C, add 0.4 Sodium sulfate and 0.8 parts of potassium carbonate are stirred evenly, and 2 parts of fumed silicon dioxide, 2 parts of silica fume, and 4 parts of nano-montmorillonite are added, and then stirred evenly with high-speed stirring to obtain the product.

Embodiment 3

[0037] In aqueous solution, use propylene glycol monovinyl polyethylene glycol ether, maleic anhydride, hydroxybutyl acrylate, 2-acrylamide-2-methylpropanesulfonic acid, chain transfer agent, oxidizing agent and reducing agent at 40 ° C ± 5 Synthesize long-acting dispersant at ℃; in aqueous solution, use sodium propenyl sulfonate, hydroxyethyl acrylate, chain transfer agent, oxidizing agent and reducing agent to synthesize thickener at 35°C±5°C; then 15 parts of long-acting After mixing dispersant, 40 parts of water, 1.5 parts of thickener, 0.4 parts of silicone defoamer and 0.5 part of ether defoamer, stir well at 50℃±5℃, add 0.4 parts of potassium sulfate and 0.4 parts of carbonic acid Stir the sodium evenly, add 2 parts of fumed silica, 2 parts of silica fume, and 2 parts of nano-montmorillonite, and then use high-speed stirring to stir evenly to obtain the product.

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Abstract

The invention provides an efficient thixotropic agent for tunnel lining concrete and a preparation method of the efficient thixotropic agent. The efficient thixotropic agent is prepared from the following raw materials in parts by mass: 10-20 parts of a long-acting dispersing agent, 20-60 parts of water, 0.5-2.5 parts of a thickening agent, 0.4-1 part of sulfate, 0.4-1 part of carbonate, 0.6-1.2 parts of a defoaming agent and 4-8 parts of nano powder. The efficient thixotropic agent is excellent in thixotropic effect and high in thixotropic effect retention capacity, stirred concrete is good in flowing property, the setting time of the concrete is not affected, the segregation problem caused by large-altitude-difference free falling, long-term vibration and the like can be effectively solved, and the pouring efficiency and the construction quality of tunnel lining concrete are guaranteed.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-efficiency thixotropic agent for tunnel lining concrete and a preparation method thereof. Background technique [0002] Tunnel lining is poured by lining trolley. Concrete pouring has undergone multiple turnovers such as pumping, chute, and free flow, and the flow distance in the airtight and narrow membrane cavity is long, resulting in a large loss of concrete fluidity. In order to ensure the pouring effect, the water-binder ratio of the lining concrete and the amount of superplasticizer are relatively high. During the pouring process, various vibration methods are often used to vibrate the concrete for a long time to increase the flow capacity of the concrete. However, the concrete with high fluidity is prone to segregation, bleeding and aggregate separation during the long-term vibration process. At the same time, when the tunnel lining concrete is poured, ...

Claims

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Application Information

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IPC IPC(8): C04B24/32
CPCC04B40/0039C04B2103/0085C04B24/32C04B24/04C04B24/06C04B24/123C04B24/16C04B24/023C04B22/147C04B14/062C04B2103/0068C04B24/005C04B24/42C04B22/10C04B18/146C04B14/104
Inventor 李化建靳昊易忠来黄法礼王振谢永江袁政成
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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