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Preparation method and application method of hydrated calcium silicate seed crystal

A technology of hydrated calcium silicate and crystal seeds, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problem that calcium silicate hydrate seeds are easy to agglomerate, and it is difficult to promote cement hydration and early strength. Not ideal, etc., to achieve good application prospects, excellent early strength effect, and stable product performance.

Inactive Publication Date: 2016-07-13
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid phase direct reaction method has a low product formation rate, contains more impurities, and the early strength effect is not ideal, so it is generally not used
Calcium silicate hydrate seeds prepared by hydrothermal method are easy to agglomerate, and larger-sized calcium silicate hydrate seeds are difficult to promote cement hydration

Method used

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  • Preparation method and application method of hydrated calcium silicate seed crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, a kind of preparation method of calcium silicate hydrate seed crystal, take calcium oxide, diatomite, deionized water and dispersant as raw material, calcium silicon ratio is 0.5, water-solid ratio is 1, and dispersant dosage is 0.1%, the reaction temperature is 50°C, the reaction pressure is 0.9MPa, and the reaction time is 10h. The mass ratios of the raw materials are respectively: 100 for calcium oxide, 258 for diatomite, 358 for deionized water, and 0.89 for the dispersant. Prepare according to the steps described in the summary of the invention to obtain the product (denoted as C-S-H-1). Fully mix the slag cement and C-S-H-1 according to the mass ratio of 100:1, and use the water-binder ratio of 0.35 to prepare the clean slurry. The performance test results are shown in Table 1.

Embodiment 2

[0026] Example 2, a method for preparing calcium silicate hydrate seed crystals, using calcium oxide, diatomaceous earth and deionized water as raw materials, the calcium-silicon ratio is 1.2, the water-solid ratio is 10, and the amount of dispersant is 0.3%. The reaction temperature is 120° C., the reaction pressure is 0.3 MPa, and the reaction time is 6 hours. The mass ratio of each raw material is respectively: 100 for calcium oxide, 108 for sodium silicate, 2080 for deionized water, and 1.56 for dispersant. Prepare according to the steps described in the summary of the invention to obtain the product (denoted as C-S-H-2). Fully mix the slag cement and C-S-H-2 according to the mass ratio of 100:2, and prepare the clean slurry with the water-binder ratio of 0.35. The performance test results are shown in Table 1.

Embodiment 3

[0027] Example 3, a method for preparing calcium silicate hydrate seed crystals, using calcium oxide, sodium silicate and deionized water as raw materials, the calcium-silicon ratio is 2.5, the water-solid ratio is 20, and the amount of dispersant is 0.5%. The reaction temperature is 180° C., the reaction pressure is 0.1 MPa, and the reaction time is 2 hours. The mass ratio of each raw material is respectively: 100 for calcium oxide, 204 for sodium silicate, 6080 for deionized water, and 3.8 for dispersant. Prepare according to the steps described in the summary of the invention to obtain the product (denoted as C-S-H-3). Fully mix the slag cement and C-S-H-3 according to the mass ratio of 100:5, and use the water-binder ratio of 0.35 to prepare the clean slurry. The performance test results are shown in Table 1.

[0028] Table 1 embodiment performance test result

[0029]

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Abstract

The invention relates to a preparation method and application method of a hydrated calcium silicate seed crystal. The materials for preparing the hydrated calcium silicate seed crystal comprise a calcium material, a silicon material, deionized water, a dispersant, anhydrous ethanol and sodium hydroxide. The adopted calcium material is calcium oxide, the adopted silicon material is one of sodium silicate and diatomite, and the adopted dispersant is a poly-carboxylic acid high molecular polymer. The controlled factors comprise the ratio of calcium to silicon, the ratio of water to solid, the dosage of the dispersant, the reaction temperature, the reaction pressure and the reaction time. The product prepared by the method provided by the invention is suitable for a construction engineering adopting mixed material cement as a cementitious system, and has an obvious effect of promoting the development of the early strength of a mixed material cement base material, so that the application scope of the mixed material cement is expanded, the dilemma of solid waste emission is relieved, the cement production cost is reduced, the emissions of wastes during cement production are reduced, and the product is beneficial to low-carbonization and greening development of cement, and has good environmental protection benefits and social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing calcium silicate hydrate seed crystals and a method for using the same. Background technique [0002] Concrete is the most important building material in the world today, and cement is one of the main components of concrete. At present, my country's cement consumption accounts for about 60% of the world's total, and a large amount of waste will be discharged in the process of firing cement, which undoubtedly poses a huge challenge to my country's environmental protection work. Based on the strategy of sustainable development, from the perspectives of energy conservation, resource consumption, reduction of industrial waste discharge and protection of the natural environment, it is required that the development, production and construction of concrete and its raw materials not only meet the basic construction needs, but also not endang...

Claims

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Application Information

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IPC IPC(8): C01B33/24C04B22/08C04B103/12
CPCC01B33/24C04B22/08C04B2103/12
Inventor 孙振平杨海静水亮亮杨旭冀言亮曾文波郭二飞刘毅
Owner TONGJI UNIV
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