Graphene-base nanocrystal-nucleus early-strength admixture and preparation method thereof

A graphene-based, nanocrystalline technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of reduced strength and durability of concrete, reduce nucleation barriers, improve early strength, and produce The effect of simple process

Active Publication Date: 2017-05-31
CHINA RAILWAY 12TH BUREAU GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a graphene-based nano-crystal nucleus early-strength agent and its preparation method in order to solve the drawbacks of the existing early-strength agents that cause the reduction of concrete strength and durability in the later stage

Method used

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  • Graphene-base nanocrystal-nucleus early-strength admixture and preparation method thereof
  • Graphene-base nanocrystal-nucleus early-strength admixture and preparation method thereof
  • Graphene-base nanocrystal-nucleus early-strength admixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]Example 1: A graphene-based nanocrystalline nucleus accelerator, referred to as nanoC-S-H@GO, with calcium nitrate as the Ca source and sodium silicate as the Si source, and the C-S-H nanocrystalline nucleus is formed by in-situ precipitation at room temperature Loaded on graphene oxide, nanoC-S-H@GO was obtained; the molar ratio of Ca to Si was 1:1, and graphene oxide, namely GO, accounted for 0.3% of the total mass of nanoC-S-H@GO. In nanoC-S-H@GO, C-S-H@GO is a composite nanocrystal grain composed of calcium silicate hydrate and graphene oxide, a non-stoichiometric compound with an indeterminate composition, with (CaO) x ·SiO2 2 (H 2 O) y @GO said, x, y are variable.

[0022] Its preparation method comprises the following steps:

[0023] (1) Graphene oxide hydrosol, that is, GO hydrosol, was prepared by the Hummer method, and the specific steps were as follows:

[0024] A. Preparation of pre-oxidized graphite powder: Add 5g graphite powder to 12ml concentrated H ...

Embodiment 2

[0027] Example 2: A graphene-based nanocrystalline nucleus accelerator, referred to as nanoC-S-H@GO, with calcium nitrate as the Ca source and sodium silicate as the Si source, and the C-S-H nanocrystalline nucleus is formed by in-situ precipitation at room temperature Loaded on graphene oxide, nanoC-S-H@GO was obtained; the molar ratio of Ca to Si was 1:1.5, and graphene oxide, namely GO, accounted for 0.5% of the total mass of nanoC-S-H@GO.

[0028] Its preparation method comprises the following steps:

[0029] (1) Graphene oxide hydrosol, GO hydrosol, was prepared by the Hummer method. The specific steps were prepared according to the method described in Example 1, and the concentration of graphene oxide GO hydrosol was 16.4 mg / mL.

[0030] (2) Dissolve 21.3g of sodium silicate nonahydrate in 100 ml of deionized water, weigh 11.8g of calcium nitrate tetrahydrate and 7.8 mL of GO in 100 mL of ionized water to make a uniform brown sol without particles, At a stirring speed o...

Embodiment 3

[0031] Example 3: A graphene-based nanocrystalline nucleus accelerator, referred to as nanoC-S-H@GO, with calcium nitrate as the Ca source and sodium silicate as the Si source, and the C-S-H nanocrystalline nucleus is formed by in-situ precipitation at room temperature Loaded on graphene oxide, nanoC-S-H@GO is obtained; the molar ratio of Ca to Si is 1:3, and graphene oxide, namely GO, accounts for 1% of the total mass of nanoC-S-H@GO.

[0032] Its preparation method comprises the following steps:

[0033] (1) Graphene oxide hydrosol, GO hydrosol, was prepared by the Hummer method. The specific steps were prepared according to the method described in Example 1, and the concentration of graphene oxide GO hydrosol was 16.4 mg / mL.

[0034] (2) Dissolve 42.6 g of sodium silicate nonahydrate in 100 ml of deionized water, weigh 11.8 g of calcium nitrate tetrahydrate and 33.2 mL of GO in 100 mL of ionized water to make a uniform brown sol without particles, and dissolve it at 300 rpm...

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Abstract

The invention belongs to the technical field of concrete admixtures. In order to solve the problem that many defects in the existing early-strength admixture often causes the problem of degradation of workability and durability, and even water impermeability and corrosion resistance, the invention provides a graphene-base nanocrystal-nucleus early-strength admixture and a preparation method thereof. According to the method, by using calcium nitrate as a Ca source and sodium silicate as a Si source, in-situ precipitation reaction is carried out at room temperature to support the C-S-H nanocrystal nucleus onto graphene oxide (GO), thereby obtaining the nano C-S-H@GO. The introduced GO greatly enhances the dispersion degree of the C-S-H crystal nucleus, exposes more C-S-H active sites, provides a crystal nucleus inducer for the early hydration period of cement, lowers the nucleation barrier of the cement hydration product, and accelerates the hydration process of the hydration product, thereby enhancing the early strength of the cement substrate on the premise of not losing later strength. The method is easy in production technique and simple to operate, and is beneficial to industrial production. The raw materials are free of harmful substances, and thus, the product is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a graphene-based nano crystal nucleus early strength agent and a preparation method thereof. Background technique [0002] Concrete early strength agent refers to the admixture that can improve the early strength of concrete and has no significant effect on the later strength. The main function of early strength agent is to accelerate the hydration rate of cement and promote the development of early strength of concrete. [0003] Traditional early strength agents are more corrosive to buildings, and have extremely poor effects at low temperatures. At present, people have developed a variety of early-strength admixtures other than chloride salts and sulfates, such as nitrite, chromate, etc., as well as organic early-strength agents, such as triethanolamine, calcium formate, urea, etc., and in On the basis of early-strength additives, a variety of composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C01B32/198C04B103/12
CPCC04B40/0039C04B2103/12C04B22/08C04B14/024
Inventor 李茜茜李全堂
Owner CHINA RAILWAY 12TH BUREAU GRP
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