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Preparation method of modified hydrotalcite-like concrete sulfate-corrosion-resistant preservative

A technology for resisting sulfate and hydrotalcite, applied in the field of civil engineering materials, to achieve the effects of improving early strength, accelerating hydration, and improving early strength and compactness

Active Publication Date: 2019-09-20
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned documents only improve the sulfate corrosion resistance of concrete by increasing the compactness of concrete and controlling the diffusion rate of sulfate ions, but they do not control the generation of aggressive products from the source of the mechanism, which improves the sulfate corrosion resistance of concrete. Ability to be further explored

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a modified hydrotalcite-like concrete anti-sulfate corrosion corrosion inhibitor, comprising the following steps:

[0023] (1) Mix 0.05mol of calcium nitrate, 0.2mol of barium nitrate, 0.1mol of aluminum nitrate, 0.4mol of sodium carbonate, 1mol of sodium hydroxide and 1L of distilled water, and use a magnetic stirrer to vigorously stir for 2 hours and then suction filter, Washing and drying to obtain hydrotalcite-like;

[0024] (2) Take 10 parts of hydrotalcite-like, 0.5 parts of KH560 silane coupling agent, 6 parts of nano-silicon dioxide, and 2 parts of ultrafine mica powder. Grind in a ball mill and pass through a 200-mesh sieve, and then calcined in a muffle furnace at 500°C for 5 hours to obtain a modified hydrotalcite-like concrete anti-sulfate corrosion preservative.

[0025] The ultrafine mica powder used has a whiteness of 80 and an average particle size of 25um; the nano-silica is hydrophilic nano-silica with an average particle size ...

Embodiment 2

[0029] A preparation method of a modified hydrotalcite-like concrete anti-sulfate corrosion corrosion inhibitor, comprising the following steps:

[0030] (1) Mix the calcium nitrate of 0.1mol, the barium nitrate of 0.5mol, the aluminum nitrate of 0.25mol, the sodium carbonate of 1.5mol, the sodium hydroxide of 3mol and 1L distilled water, use magnetic stirrer to vigorously stir after 2 hours and suction filter, Washing and drying to obtain hydrotalcite-like;

[0031] (2) Take 15 parts of hydrotalcite-like, 0.5 parts of KH560 silane coupling agent, 5 parts of nano-silicon dioxide, 3 parts of ultrafine mica powder and mix them. After ultrasonic dispersion for 6 hours, dry them in an oven at 80°C for 8 hours. Grind in a ball mill and pass through a 200-mesh sieve, and then calcined in a muffle furnace at 500°C for 5 hours to obtain a modified hydrotalcite-like concrete anti-sulfate corrosion preservative.

[0032] The ultrafine mica powder used has a whiteness of 80 and an avera...

Embodiment 3

[0036] A preparation method of a modified hydrotalcite-like concrete anti-sulfate corrosion corrosion inhibitor, comprising the following steps:

[0037] (1) Mix 0.02 mol of calcium nitrate, 0.1 mol of barium nitrate, 0.04 mol of aluminum nitrate, 0.2 mol of sodium carbonate, 0.4 mol of sodium hydroxide and 500 mL of distilled water, stir vigorously with a magnetic stirrer for 2 hours and then suction filter , washed and dried to obtain hydrotalcite-like;

[0038] (2) Take 10 parts of hydrotalcite-like, 1 part of KH570 silane coupling agent, 5 parts of nano-silicon dioxide, 2 parts of ultra-fine mica powder and mix them. After ultrasonic dispersion for 6 hours, dry them in an oven at 80°C for 8 hours. Grind in a ball mill and pass through a 200-mesh sieve, and then calcined in a muffle furnace at 500°C for 5 hours to obtain a modified hydrotalcite-like concrete anti-sulfate corrosion preservative.

[0039] The ultrafine mica powder used has a whiteness of 80 and an average part...

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Abstract

The invention discloses a preparation method of a modified hydrotalcite-like concrete anti-sulfate-corrosion preservative. The method comprises the following steps: mixing calcium nitrate, barium nitrate, aluminum nitrate, sodium carbonate, sodium hydroxide and distilled water to prepare a solution, and stirring, suction-filtering, washing and drying the solution to obtain hydrotalcite-like compounds; and mixing the obtained hydrotalcite-like compound with nano silicon dioxide, ultrafine mica powder and a silane coupling agent, carrying out ultrasonic dispersion, drying and grinding the mixture, sieving the ground mixture with a 200-mesh sieve, and calcining the mixture to obtain the preservative. When the preservative is applied to concrete, the diffusion of sulfate ions can be reduced, the generation of sulfate corrosive products is prevented, and the sulfate corrosion resistance of the concrete is improved.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, and in particular relates to a preparation method of a modified hydrotalcite-like concrete anti-sulfate erosion preservative. Background technique [0002] Cement-based composite materials represented by concrete are often damaged due to insufficient durability of concrete during practical engineering applications, including freeze-thaw corrosion, chloride ion corrosion, sulfate corrosion and carbonization. These damages basically involve multiple damage mechanisms such as "chemical reaction-microstructure change-mechanical damage", and even experience multi-factor coupling erosion in some harsh environments. Among the many erosion damage problems, sulfate attack has attracted extensive attention from all walks of life due to its complex damage mechanism and form. In general, sulfate attack of concrete includes physical crystallization damage due to sulfates and chemical damage through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B20/02C04B14/36
CPCC04B20/023C04B40/0039C04B2103/61C04B14/36C04B24/42C04B14/06C04B14/20C04B28/04
Inventor 蒋林华严先萃
Owner HOHAI UNIV
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