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Water reducing agent composition for steam-curing-free concrete and preparation method thereof

A technology of water reducer and concrete, which is applied in the field of water reducer composition for steam-free concrete and its preparation, which can solve the problems of longer construction period and complicated operation process, and achieve the effect of accelerating nucleation and growth

Inactive Publication Date: 2021-04-16
武汉新绿博恩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only leads to the complexity of the operation process, but also leads to a longer construction period

Method used

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  • Water reducing agent composition for steam-curing-free concrete and preparation method thereof
  • Water reducing agent composition for steam-curing-free concrete and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] This example provides the preparation method of the early-strength polycarboxylate water reducer in the present invention. In this example, a high-molecular-weight polyether and unsaturated early-strength functional monomers are used to prepare an early-strength polycarboxylate water reducer with a suitable acid-ether ratio. On the one hand, it can achieve the effect of early strength, and on the other hand, it can also avoid collapse. decrease in fall.

[0055] Specifically, the early-strength polycarboxylate water reducer is formed by copolymerization of methallyl polyoxyethylene ether (HPEG), unsaturated acid and early-strength functional monomers.

[0056] The molecular weight of HPEG is 4000-8000, the unsaturated acid is acrylic acid or methacrylic acid, and the early-strength functional monomer is acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, methacryloyloxyethyltrimethyl Ammonium chloride (DMC) or N-(3-dimethylaminopropyl) methacrylamide (DAP) or a mixtur...

Embodiment 2

[0067] A water-reducing agent composition for steam-free concrete, which is prepared by the following method:

[0068] Step 1, preparing a gel system containing C-S-H crystal nuclei;

[0069] Mix 4 parts by mass of tricalcium silicate with 1 part by mass of inorganic early-strength agent calcium formate, 1 mass part of organic early-strength agent triethanolamine and 40 parts by mass of water, and stir for 3-6 hours to obtain C-S-H crystal nuclei gel system;

[0070] Step 2. Add 8 parts by mass of early-strength polycarboxylate superplasticizer to the gel system containing C-S-H crystal nuclei to prepare a dispersion containing C-S-H crystal nuclei;

[0071] Step 3, preparing a dispersion liquid containing nanoparticles and lithium salt;

[0072] 5 parts by mass of nanoparticles Al 2 o 3 Add 8 parts by mass of early-strength polycarboxylate water reducer to 0.1 mass part of lithium salt lithium carbonate, and stir to obtain a dispersion containing nanoparticles and lithium...

Embodiment 3

[0075] A water-reducing agent composition for steam-free concrete, which is prepared by the following method:

[0076] Step 1, preparing a gel system containing C-S-H crystal nuclei;

[0077] Mix 7 parts by mass of tricalcium silicate with 1 part by mass of inorganic early-strength agent calcium formate, 1 mass part of organic early-strength agent triethanolamine and 50 parts by mass of water, and stir for 3-6 hours to obtain C-S-H crystal nuclei gel system;

[0078] Step 2. Add 12 parts by mass of early-strength polycarboxylate superplasticizer to the gel system containing C-S-H crystal nuclei to prepare a dispersion containing C-S-H crystal nuclei;

[0079] Step 3, preparing a dispersion liquid containing nanoparticles and lithium salt;

[0080] 7 parts by mass of nanoparticles Al 2 o 3 Add 11 parts by mass of early-strength polycarboxylate water reducer to 0.1 mass part of lithium salt lithium carbonate, and stir to obtain a dispersion containing nanoparticles and lithi...

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Abstract

The invention provides a water reducing agent composition for steam-curing-free concrete and a preparation method thereof. The water reducing agent composition comprises an early-strength polycarboxylate water reducing agent, a C-S-H crystal nucleus, a lithium salt, nanoparticles and a general early strength agent. The acid-ether ratio of the water reducing agent is 4:1-5:1, and the water reducing agent is formed by copolymerization of HPEG, acrylic acid, acrylamide, 2-acrylamide-2-methyl propanesulfonic acid, DMC or DAP. The nanoparticles are nano metal oxides, and the early strength agent comprises at least one inorganic early strength agent and an organic early strength agent. The preparation method comprises the following steps: 1, mixing tricalcium silicate with the inorganic early strength agent, the organic early strength agent and water to obtain a gel system containing C-S-H crystal nucleus; 2, adding a water reducing agent to obtain a dispersion liquid containing C-S-H crystal nucleus; 3, adding the nanoparticles and a lithium salt into a water reducing agent, and stirring to obtain a dispersion liquid containing the nanoparticles and the lithium salt; and 4, slowly adding the product obtained in the step 2 into the product obtained in the step 3 to obtain the water reducing agent composition for steam-curing-free concrete. The composition disclosed by the invention is good in early strength effect, good in concrete construction performance, free of steam curing, simple in process and beneficial to shortening the construction period.

Description

technical field [0001] The invention provides a water reducer composition for non-steam curing concrete and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] With the rapid development of my country's construction industry, not only the amount of concrete is increasing, but also the requirements for types and performance are getting higher and higher. In the projects of high-speed railways, subways, river-crossing tunnels, and lake-crossing tunnels, a large number of prefabricated concrete parts are required. [0003] Those skilled in the art know that concrete for prefabricated parts needs to have good early strength, short setting time and good concrete workability. However, usually in order to obtain good early strength, it needs to go through the process of steam curing and autoclaving. This not only leads to the complexity of the operation process, but also leads to a longer construction period. [00...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/30
Inventor 陈学兵陈刚伊开创吴求振
Owner 武汉新绿博恩科技有限公司
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