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Concrete admixture as well as preparation method and application thereof

A concrete admixture and unsaturated technology, which is applied in the field of concrete admixtures, can solve the problems of large fluctuations in particle gradation and other parameters, achieve excellent adaptability, strong adaptability, and reduce construction difficulty and workload.

Active Publication Date: 2021-11-23
中铁桥研科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of relatively large fluctuations in parameters such as mud content, stone powder content, and particle gradation of machine-made sand in mountainous areas, the present invention uses molecular tailoring technology to position and splice various functional functional groups onto the polyether main chain to prepare a special super-dispersed, Concrete admixture with high slump retention and high adaptability

Method used

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  • Concrete admixture as well as preparation method and application thereof
  • Concrete admixture as well as preparation method and application thereof
  • Concrete admixture as well as preparation method and application thereof

Examples

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preparation example Construction

[0032] n=15~20, because it contains mercapto group, it can play the role of chain transfer, no additional chain transfer agent is added, the process is safe and simple, green and environmentally friendly, low energy consumption, low cost, suitable for industrial scale production; Oxypolyethylene glycol thioglycolate is prepared by the following method: methoxypolyethylene glycol (structural formula CH 3 O(CH 2 CH 2 O) n H, n=15~20) and mineral trioxide agglomerate (MTA) are mixed evenly, and concentrated sulfuric acid is added dropwise when heated to 35~45°C, and continuously stirred, until the temperature of the reaction solution rises to 115~130°C, add dropwise After completion, the dropping time is 3 hours. After the dropping, the temperature is lowered to 80-95°C and kept warm for 6 hours to obtain the branched chain functional monomer methoxypolyethylene glycol thioglycolate; wherein concentrated sulfuric acid accounts for methoxypolyethylene glycol 0.4wt%-0.8wt% of ...

Embodiment 1

[0038] The concrete admixture provided in this example is made of raw materials: methallyl polyoxyethylene ether, acrylic acid, and methoxy polyethylene glycol with a molar ratio of 1:0.015:0.2:0.003:0.15:0.1:0.002:0.01 Thioglycollate, 2-acrylamide-2-methylpropanesulfonic acid, polymerizable methacryloyloxypropyl phosphate, unsaturated mud inhibitor, hydrogen peroxide, L-ascorbic acid.

[0039] The method for preparing concrete admixture provided by the present embodiment comprises the following steps:

[0040] (1) Add methallyl polyoxyethylene ether and water to the container to prepare a bottom liquid with a concentration of 25wt%;

[0041] (2) Weigh acrylic acid, methoxypolyethylene glycol thioglycolate, 2-acrylamide-2-methylpropanesulfonic acid, polymerizable methacryloxypropyl phosphate, unsaturated Add mud inhibitor and hydrogen peroxide, mix well and add water to prepare a solution A with a concentration of 3.5wt%; mix the reducing agent with water to prepare a solutio...

Embodiment 2

[0044] The concrete admixture provided in this example is made of raw materials: methallyl polyoxyethylene ether, acrylic acid, and methoxy polyethylene glycol with a molar ratio of 1:0.02:0.025:0.4:0.18:0.15:0.03:0.015 Thioglycollate, 2-acrylamide-2-methylpropanesulfonic acid, polymerizable methacryloyloxypropyl phosphate, unsaturated mud inhibitor, hydrogen peroxide, L-ascorbic acid.

[0045] The method for preparing concrete admixture provided by the present embodiment comprises the following steps:

[0046] (1) Add methallyl polyoxyethylene ether and water to the container to prepare a bottom liquid with a concentration of 28wt%;

[0047] (2) Weigh acrylic acid, methoxypolyethylene glycol thioglycolate, 2-acrylamide-2-methylpropanesulfonic acid, polymerizable methacryloxypropyl phosphate, unsaturated Add mud inhibitor and hydrogen peroxide, mix well and add water to prepare a solution A with a concentration of 3.7wt%; mix the reducing agent with water to prepare a solutio...

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Abstract

The invention discloses a concrete admixture as well as a preparation method and application thereof. The concrete admixture is prepared from an unsaturated polyether macromonomer, unsaturated fatty acid or anhydride thereof, methoxy polyethylene glycol thioglycolate, 2-acrylamide-2-methylpropanesulfonic acid, unsaturated phosphate, an unsaturated mud inhibitor, an initiator, a reducing agent and water according to a molar ratio of 1: (0.01-0.04): (0.02-0.4): (0.003-0.4): (0.1-0.5): (0.1-0.4): (0.002-0.08): (0.01-0.03). In the raw materials, the unsaturated polyether macromonomer forms a long main chain, and the other substances are connected to the main chain through unsaturated double bonds to form branched chains with different lengths, so that an excellent steric hindrance combination effect can be generated, and the concrete admixture has excellent water reducing property and slump retaining property and can adapt to machine-made sand with the silt content fluctuating within the range of 5 wt%-10 wt% and the stone powder content fluctuating within the range of 8 wt%-14 wt%.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a concrete admixture and its preparation method and application. Background technique [0002] Due to the shortage of natural river sand resources, it has become an inevitable choice to use the abundant local machine-made sand resources to prepare high-performance concrete in engineering construction in mountainous areas. However, limited by the rock formation conditions and processing technology at the project site, machine-made sand generally has problems of poor quality and large fluctuations in parameters such as mud content, stone powder content, and particle gradation. When the mud content of the machine-made sand is large, it is necessary to add more pumping agent because the mud absorbs water-reducing components; when the mud content suddenly becomes small, if the amount of pumping agent exceeds its saturation point, it will cause concrete The phenomenon of mixture seg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/58C08F230/02C04B24/26
CPCC08F283/065C04B24/246C08F220/06C08F220/585C08F230/02Y02W30/91
Inventor 韦鹏亮蔡昱包嘉诚陈露一盖珂瑜
Owner 中铁桥研科技有限公司
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