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A kind of cement-based material chlorine fixing agent and preparation method thereof

A technology of cement-based materials and chlorine agents, applied in the field of building materials, can solve problems such as limited chlorine fixation capacity, achieve low cost, simple preparation process, and obvious effects

Active Publication Date: 2021-09-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of high-alumina mineral admixtures such as metakaolin, fly ash, and mineral powder can improve the chloride ion curing ability of cement-based materials, but because there are many inert components in it and the hydration of amorphous silicon will consume a large amount of calcium hydroxide, resulting in Its ability to fix chlorine is limited

Method used

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  • A kind of cement-based material chlorine fixing agent and preparation method thereof
  • A kind of cement-based material chlorine fixing agent and preparation method thereof
  • A kind of cement-based material chlorine fixing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A chloride ion curing agent for cement-based materials, the raw materials used and the proportion are: 100 parts of nano-alumina sol (solid content 10%), 10 parts of metakaolin, 30 parts of alumina, 20 parts of aluminum hydroxide, after mixing the four raw materials After ball milling for 12 hours, the finished chlorine fixation agent slurry was obtained, with a solid content of 43.8%.

[0029] The chlorine-fixing agent prepared in this example is used to replace the cement according to the quality of the effective components to prepare the clean slurry, and the addition amount of the effective components of the chlorine-fixing agent is 3%, 6% and 9% of the total mass of the cement that should be added; in addition, due to the current recognized Metakaolin has a strong ability to solidify chloride ions. In this example, 3%, 6% and 9% metakaolin were added for comparison. The mix ratio and 28-day strength of the slurry are shown in Table 2 .

[0030] Table 2 Mixing rati...

Embodiment 2

[0034] A chloride ion curing agent for cement-based materials, the raw materials used and the proportion are: 100 parts of nano-alumina sol (solid content 20%), 15 parts of metakaolin, 35 parts of alumina, 15 parts of aluminum hydroxide, after mixing the four raw materials After ball milling for 8 hours, the finished chlorine fixation agent slurry was obtained, with a solid content of 51.5%.

[0035] The chlorine-fixing agent prepared in this example is used to replace the cement by the mass of the effective components to prepare sea sand mortar. The addition of the effective components of the chlorine-fixing agent is 4% and 8% of the total mass of the cement that should be added. The samples are respectively marked as S1, S2, the mix ratio and 28-day strength are shown in Table 3, and REF2 in the table represents the reference sample without chlorine reinforcement.

[0036] Table 3 Mixing ratio and strength of sea sand mortar mixed with chlorine-fixing agent

[0037]

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Abstract

The invention relates to a chlorine-fixing agent for cement-based materials and a preparation method thereof. The solid content of the chlorine-fixing agent is 30-60%, and the raw material components and mass parts are as follows: 100 parts of nano-aluminum sol; 5-20 parts of metakaolin; 10-45 parts of aluminum; 10-30 parts of aluminum hydroxide. The chlorine-fixing agent for cement-based materials provided by the invention has obvious effect. When the dosage of effective components is 2-9%, the content of free chlorine in the cement-based materials mixed with sea sand or seawater after curing for 28 days can be reduced by 15.1-40.9%. %, has no obvious adverse effect on the mechanical properties of cement-based materials, and is of great significance to prolong the service life of reinforced concrete using chlorine-rich raw materials.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a chlorine-fixing agent for cement-based materials and a preparation method thereof. Background technique [0002] With the depletion of river sand resources and the continuous development of marine engineering projects, sea sand is more and more widely used in concrete structures. However, because sea sand contains more chloride ions, when it is used to prepare reinforced concrete, the chloride ions dissolve in the pore solution, resulting in an increase in the free chloride ion content of the system, and the free chloride ions gather around the reinforcement under the action of the micro-battery, causing Premature corrosion of steel bars causes damage to concrete structures. In addition, especially for offshore projects, the mixing water used to prepare concrete is also in short supply. Since seawater is rich in chloride ions, using it as mixing water wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/30C04B28/02C04B14/10
Inventor 水中和王云摇黄赟
Owner WUHAN UNIV OF TECH