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Low-temperature cement and preparation method thereof

A cement and low temperature technology, applied in the field of low temperature cement and its preparation, can solve the problems of low strength, complicated construction, unsuitable for large-scale use, etc., to improve the early strength and late strength, ensure early strength and late strength, and shorten cement coagulation. effect of time

Pending Publication Date: 2021-08-06
厦门美益建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latter is not suitable for large-scale application due to the disadvantages of complex construction and low efficiency.
[0004] The coagulant used more at present is alkaline coagulant, which is mainly made of inorganic salt raw materials such as lime, sodium aluminate, silicate and carbonate. The inventors found that using this type of accelerator in cement mortar or concrete When using a coagulant, although it can meet the needs of rapid hardening, the strength loss in the later stage is large, resulting in lower strength in the later stage

Method used

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  • Low-temperature cement and preparation method thereof
  • Low-temperature cement and preparation method thereof
  • Low-temperature cement and preparation method thereof

Examples

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preparation example Construction

[0039] Examples of Preparation of Raw Materials and / or Intermediates

[0040] raw material

[0041] Portland cement clinker was purchased from Lingshou County Yanhang Mineral Products Processing Plant;

[0042] Gypsum, industrial grade, 99%, purchased from Hebei Shibide Building Materials Co., Ltd.;

[0043] Fly ash, grade 2, was purchased from Lanxiang Mineral Products Processing Plant in Lingshou County;

[0044] Silica fume was purchased from Shijiazhuang Tourmaline Mineral Products Co., Ltd.;

[0045] Slag was purchased from Ma Lin Mineral Products Processing Plant in Lingshou County;

[0046] Aluminum sulfate, as Al 2 (SO 4 ) 3 18H 2 O, analytically pure, purchased from Shandong Landing New Energy Technology Co., Ltd.;

[0047] Aluminum hydroxide, industrial grade, purchased from Jinan Chaoyixing Chemical Co., Ltd.;

[0048] Hydrofluoric acid, the HF content in the solution is 40%;

[0049] Diethanolamine, analytically pure, purchased from Shandong Xima Supply C...

preparation example 1

[0059] Fluoroaluminum complex, its preparation method is:

[0060] Weigh 30kg of hydrofluoric acid solution with a mass percent concentration of 40%, heat the hydrofluoric acid solution to 65°C, add 10kg of aluminum hydroxide into the hydrofluoric acid solution while stirring, and continue stirring after adding all the aluminum hydroxide After 30 min, the residue was filtered off and cooled to room temperature to obtain a fluoroaluminum complex.

preparation example 2

[0062] Coagulant, its preparation method is:

[0063] 1) Heat 38kg of water to 65°C, add 31kg of aluminum sulfate into the water while stirring, and stir until the aluminum sulfate is completely dissolved to prepare an aluminum sulfate solution;

[0064] 2) Add 0.4kg diethanolamine and 0.6kgEDTA to the aluminum sulfate solution while stirring and mix evenly to obtain mixed solution A;

[0065] 3) Add 25kg of the fluoroaluminum complex obtained in Preparation Example 1 into the mixed solution A while stirring, then add 0.3kg of sodium formate, 2kg of potassium sulfate, 0kg of nanometer silicon carbide, and 0kg of nanometer magnesium hydroxide, and mix uniformly. A coagulation accelerator is obtained, wherein the particle diameters of the nano-silicon carbide and the nano-magnesium hydroxide are both 10-30 nm.

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Abstract

The invention relates to the field of building materials, and particularly discloses low-temperature cement and a preparation method thereof. The low-temperature cement is prepared from the following raw materials in parts by weight: 45-85 parts of Portland cement clinker, 9-20 parts of gypsum, 5-15 parts of fly ash, 3-10 parts of silica fume, 12-25 parts of slag and 2-6 parts of a coagulant. The coagulant is prepared from the following raw materials in parts by weight: 20-31 parts of aluminum sulfate, 16-25 parts of a fluorine-aluminum complex, 1-5 parts of a complexing agent, 0.3-1 part of organic salt, 0.8-2 parts of inorganic salt and 38-53 parts of water. The preparation method comprises the following steps: uniformly mixing the raw materials except the coagulant, adding the coagulant, and uniformly mixing to obtain the low-temperature cement. The low-temperature cement has the advantages that the setting time is shortened, and the early strength and the later strength of the cement are guaranteed.

Description

technical field [0001] The application relates to the field of building materials, more specifically, it relates to a low-temperature cement and a preparation method thereof. Background technique [0002] Cement is a powdery hydraulic inorganic gelling material. It can be mixed with water to form a slurry. It can be hardened in the air or in water, and can firmly bind sand, stone and other materials together. It is an important cement. Cementitious materials are widely used in civil construction, water conservancy, national defense and other projects. [0003] The initial setting and final setting of cement will be affected by the temperature. The lower the temperature, the longer the setting time is. The construction industry is generally constructed outdoors. In winter, the outdoor temperature is below zero, and the setting time of cement is prolonged, which affects the construction. Normally, in order to reduce the impact of cold weather on cement, some construction unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B24/00C04B103/12
CPCC04B28/14C04B40/0039C04B2103/12C04B2201/50C04B7/02C04B18/08C04B18/146C04B18/141C04B22/148C04B22/126C04B22/08C04B24/00
Inventor 罗晴峰张荣胜吕邓锋
Owner 厦门美益建材有限公司
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